package net.sf.saxon;

import net.sf.saxon.event.Builder;
import net.sf.saxon.event.ProxyReceiver;
import net.sf.saxon.event.Receiver;
import net.sf.saxon.event.SaxonOutputKeys;
import net.sf.saxon.expr.PathMap;
import net.sf.saxon.instruct.TerminationException;
import net.sf.saxon.om.*;
import net.sf.saxon.query.*;
import net.sf.saxon.trace.ExpressionPresenter;
import net.sf.saxon.trace.XQueryTraceListener;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.type.SchemaException;
import net.sf.saxon.value.UntypedAtomicValue;
import net.sf.saxon.value.Whitespace;
import org.xml.sax.InputSource;

import javax.xml.transform.OutputKeys;
import javax.xml.transform.Source;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactoryConfigurationError;
import javax.xml.transform.sax.SAXSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;
import java.io.*;
import java.util.*;

/**
 * This <B>Query</B> class provides a command-line interface to the Saxon XQuery processor.<p>
 * <p/>
 * The XQuery syntax supported conforms to the W3C XQuery 1.0 drafts.
 *
 * @author Michael H. Kay
 */

public class Query {

    protected Configuration config;
    protected boolean showTime = false;
    protected int repeat = 1;
    protected String sourceFileName = null;
    protected String queryFileName = null;
    protected boolean useURLs = false;
    protected String outputFileName = null;
    protected String moduleURIResolverClass = null;
    protected String uriResolverClass = null;
    protected boolean explain = false;
    protected boolean wrap = false;
    protected boolean pullMode = false;
    protected boolean projection = false;
    protected boolean updating = false;
    protected boolean writeback = false;
    protected boolean backup = true;
    protected String explainOutputFileName = null;
    //private PrintStream traceDestination = System.err;
    private boolean closeTraceDestination = false;

    private boolean schemaAware = false;

    /**
     * Set the configuration. This is designed to be
     * overridden in a subclass
     *
     * @param schemaAware true if a schema-aware configuration is required (in this case Saxon-SA must
     *                    be installed and licensed)
     * @param className   the name of the class to be loaded, representing the Configuration. This
     *                    allows additional control of the loading process under .NET
     * @return the successfully loaded Configuration
     */

    protected Configuration makeConfiguration(boolean schemaAware, String className) {
        if (schemaAware) {
            config = Configuration.makeSchemaAwareConfiguration(null, className);
        } else {
            config = new Configuration();
            // In basic XQuery, all nodes are untyped when calling from the command line
            config.setAllNodesUntyped(true);
        }
        return config;
    }

    /**
     * Get the configuration in use
     *
     * @return the configuration
     */

    protected Configuration getConfiguration() {
        return config;
    }

    /**
     * Main program, can be used directly from the command line.
     * <p>The format is:</P>
     * <p>java net.sf.saxon.Query [options] <I>query-file</I> &gt;<I>output-file</I></P>
     * <p>followed by any number of parameters in the form {keyword=value}... which can be
     * referenced from within the query.</p>
     * <p>This program executes the query in query-file.</p>
     *
     * @param args List of arguments supplied on operating system command line
     * @throws Exception Indicates that a compile-time or
     *                   run-time error occurred
     */

    public static void main(String args[])
            throws Exception {
        // the real work is delegated to another routine so that it can be used in a subclass
        (new Query()).doQuery(args, "java net.sf.saxon.Query");
    }

    /**
     * Support method for main program. This support method can also be invoked from subclasses
     * that support the same command line interface
     *
     * @param args    the command-line arguments
     * @param command name of the class, to be used in error messages
     */

    protected void doQuery(String args[], String command) {

        schemaAware = testIfSchemaAware(args);

        config = makeConfiguration(schemaAware, null);
        config.setHostLanguage(Configuration.XQUERY);

        StaticQueryContext staticEnv = new StaticQueryContext(config);
        DynamicQueryContext dynamicEnv = new DynamicQueryContext(config);
        Properties outputProps = new Properties();

        // Check the command-line arguments.

        try {
            parseOptions(args, command, dynamicEnv, outputProps);

            if (updating) {
                staticEnv.setUpdatingEnabled(true);
            }

            if (moduleURIResolverClass != null) {
                Object mr = config.getInstance(moduleURIResolverClass, null);
                if (!(mr instanceof ModuleURIResolver)) {
                    badUsage(command, moduleURIResolverClass + " is not a ModuleURIResolver");
                }
                staticEnv.setModuleURIResolver((ModuleURIResolver)mr);
            }

            if (uriResolverClass != null) {
                config.setURIResolver(config.makeURIResolver(uriResolverClass));
                dynamicEnv.setURIResolver(config.makeURIResolver(uriResolverClass));
            }

            config.displayLicenseMessage();
            if (pullMode) {
                //config.setLazyConstructionMode(true);
            }

            if (explain) {
                config.setOptimizerTracing(true);
            }

            Source sourceInput = null;

            if (sourceFileName != null) {
                sourceInput = processSourceFile(sourceFileName, useURLs);
            }

            long startTime = (new Date()).getTime();
            if (showTime) {
                System.err.println("Analyzing query from " + queryFileName);
            }

            // Compile the query

            XQueryExpression exp;
            try {
                exp = compileQuery(staticEnv, queryFileName, useURLs);

                if (showTime) {
                    long endTime = (new Date()).getTime();
                    System.err.println("Analysis time: " + (endTime - startTime) + " milliseconds");
                    startTime = endTime;
                }

            } catch (XPathException err) {
                int line = -1;
                String module = null;
                if (err.getLocator() != null) {
                    line = err.getLocator().getLineNumber();
                    module = err.getLocator().getSystemId();
                }
                if (err.hasBeenReported()) {
                    quit("Static error(s) in query", 2);
                } else {
                    if (line == -1) {
                        System.err.println("Static error in query: " + err.getMessage());
                    } else {
                        System.err.println("Static error at line " + line + " of " + module + ':');
                        System.err.println(err.getMessage());
                    }
                }
                exp = null;
                System.exit(2);
            }

            if (explain) {
                explain(exp);
            }

            // Load the source file (applying document projection if requested)

            exp.setAllowDocumentProjection(projection);
            processSource(sourceInput, exp, dynamicEnv);

            // Run the query (repeatedly, if the -repeat option was set)

            long totalTime = 0;
            int r;
            for (r = 0; r < repeat; r++) {      // repeat is for internal testing/timing
                try {
                    OutputStream destination;
                    if (outputFileName != null) {
                        File outputFile = new File(outputFileName);
                        if (outputFile.isDirectory()) {
                            quit("Output is a directory", 2);
                        }
                        destination = new FileOutputStream(outputFile);
                    } else {
                        destination = System.out;
                    }

                    runQuery(exp, dynamicEnv, destination, outputProps);
                } catch (TerminationException err) {
                    throw err;
                } catch (XPathException err) {
                    if (err.hasBeenReported()) {
                        //err.printStackTrace();
                        throw new XPathException("Run-time errors were reported");
                    } else {
                        throw err;
                    }
                }

                if (showTime) {
                    long endTime = (new Date()).getTime();
                    if (r > 3) {
                        totalTime += (endTime - startTime);
                    }
                    if (repeat != 100) {
                        System.err.println("Execution time: " + (endTime - startTime) + " milliseconds");
                    } else if (totalTime > 100000) {
                        break;
                    }
                    startTime = endTime;
                }
            }

            if (repeat > 3) {
                System.err.println("Average execution time: " + (totalTime / (double)(r - 3)) + " milliseconds");
            }

        } catch (TerminationException err) {
            quit(err.getMessage(), 1);
        } catch (XPathException err) {
            quit("Query processing failed: " + err.getMessage(), 2);
        } catch (TransformerFactoryConfigurationError err) {
            err.printStackTrace();
            quit("Query processing failed", 2);
        } catch (SchemaException err) {
            quit("Schema processing failed: " + err.getMessage(), 2);
        } catch (Exception err2) {
            err2.printStackTrace();
            quit("Fatal error during query: " + err2.getClass().getName() + ": " +
                    (err2.getMessage() == null ? " (no message)" : err2.getMessage()), 2);
        }
    }

    /**
     * Prescan the command line arguments to see if any of them imply use of a schema-aware processor
     * @param args the command line arguments
     * @return true if a schema-aware processor is needed
     */

    protected boolean testIfSchemaAware(String[] args) {
        for (int i = 0; i < args.length; i++) {
            if (args[i].equals("-sa") ||
                    args[i].startsWith("-val:") ||
                    args[i].equals("-val") ||
                    args[i].equals("-vlax") ||
                    args[i].equals("-p") ||
                    args[i].equals("-xsd:") ||
                    args[i].startsWith("-xsdversion:") ||
                    args[i].startsWith("-projection:") ||
                    args[i].startsWith("-update:")) {
                return true;
            }
        }
        return false;
    }

    /**
     * Parse the options supplied on the command line
     * @param args the command line arguments
     * @param command the name of the command that was used (for diagnostics only)
     * @param dynamicEnv the XQuery dynamic context
     * @param outputProps the serialization properties
     * @throws TransformerException if failures occur. Note, the method may also invoke System.exit().
     */

    protected void parseOptions(String[] args, String command, DynamicQueryContext dynamicEnv, Properties outputProps)
            throws TransformerException {
        int i = 0;
        String additionalSchemas = null;
        while (i < args.length) {

            if (args[i].charAt(0) == '-') {
                String option;
                String value = null;
                int colon = args[i].indexOf(':');
                if (colon > 0 && colon < args[i].length() - 1) {
                    option = args[i].substring(1, colon);
                    value = args[i].substring(colon + 1);
                } else {
                    option = args[i].substring(1);
                }
                if (option.equals("backup")) {
                    if (!("on".equals(value) || "off".equals(value))) {
                        badUsage(command, "-backup option must be -backup:on or -backup:off");
                    }
                    backup = "on".equals(value);
                    i++;
                } else if (option.equals("cr")) {                // collection resolver
                    i++;
                    if (value == null) {
                        if (args.length < i + 2) {
                            badUsage(command, "No resolver after -cr");
                        }
                        value = args[i++];
                    }
                    Object resolver = config.getInstance(value, null);
                    if (!(resolver instanceof CollectionURIResolver)) {
                        quit(value + " is not a CollectionURIResolver", 2);
                    }
                    config.setCollectionURIResolver((CollectionURIResolver)resolver);

                } else if (option.equals("ds")) {         // linked tree
                    config.setTreeModel(Builder.LINKED_TREE);
                    i++;
                } else if (option.equals("dt")) {         // tiny tree (default)
                    config.setTreeModel(Builder.TINY_TREE);
                    i++;
                } else if (option.equals("dtd")) {
                    if (!("on".equals(value) || "off".equals(value))) {
                        badUsage(command, "-dtd option must be -dtd:on or -dtd:off");
                    }
                    config.setValidation("on".equals(value));
                    i++;
                } else if (option.equals("e")) {          // explain
                    explain = true;
                    i++;
                } else if (option.equals("expand")) {
                    if (!("on".equals(value) || "off".equals(value))) {
                        badUsage(command, "-expand option must be 'on' or 'off'");
                    }
                    config.setExpandAttributeDefaults("on".equals(value));
                    i++;
                } else if (option.equals("explain")) {          // explain
                    explain = true;
                    i++;
                } else if (option.startsWith("explain:")) {     // explain:filename
                    explain = true;
                    explainOutputFileName = value;
                    i++;
                } else if (option.equals("ext")) {
                    if (!("on".equals(value) || "off".equals(value))) {
                        badUsage(command, "-ext option must be -ext:on or -ext:off");
                    }
                    config.setAllowExternalFunctions("on".equals(value));
                    i++;
                } else if (option.equals("l")) {
                    if (!(value == null || "on".equals(value) || "off".equals(value))) {
                        badUsage(command, "-l option must be -l:on or -l:off");
                    }
                    config.setLineNumbering(!"off".equals(value));
                    i++;

                    //i++;
                } else if (option.equals("mr")) {
                    i++;
                    if (value == null) {
                        if (args.length < i + 2) {
                            badUsage(command, "No resolver after -cr");
                        }
                        value = args[i++];
                    }
                    moduleURIResolverClass = value;
                } else if (option.equals("-noext")) {
                    i++;
                    config.setAllowExternalFunctions(false);
                } else if (option.equals("o")) {
                    i++;
                    if (value == null) {
                        if (args.length < i + 2) {
                            badUsage(command, "No output file name after -o");
                        }
                        value = args[i++];
                    }
                    outputFileName = value;
                } else if (option.equals("outval")) {
                    if (schemaAware) {
                        if (!(value == null || "recover".equals(value) || "fatal".equals(value))) {
                            badUsage(command, "-outval option must be 'recover' or 'fatal'");
                        }
                        config.setValidationWarnings("recover".equals(value));
                    } else {
                        quit("The -outval option requires a schema-aware processor", 2);
                    }
                    i++;
                } else if (option.equals("p")) {
                    i++;
                    if (!(value == null || "on".equals(value) || "off".equals(value))) {
                        badUsage(command, "-p option must be -p:on or -p:off");
                    }
                    if (!"off".equals(value)) {
                        config.setParameterizedURIResolver();
                        useURLs = true;
                    }
                } else if (option.equals("pipe")) {
                    i++;
                    if (!("push".equals(value) || "pull".equals(value))) {
                        badUsage(command, "-pipe option must be -p:push or -p:pull");
                    }
                    if ("pull".equals(value)) {
                        pullMode = true;
                    }
                } else if (option.equals("projection")) {
                    i++;
                    if (!(value == null || "on".equals(value) || "off".equals(value))) {
                        badUsage(command, "-projection option must be -projection:on or projection:off");
                    }
                    if (!"off".equals(value)) {
                        projection = true;
                    }
                } else if (option.equals("pull")) {
                    i++;
                    pullMode = true;
                } else if (option.equals("q")) {
                    i++;
                    queryFileName = value;
                } else if (option.equals("qs")) {
                    i++;
                    queryFileName = "{" + value + "}";
                } else if (option.equals("r")) {
                    i++;
                    if (value == null) {
                        if (args.length < i + 2) {
                            badUsage(command, "No URIResolver class after -r");
                        }
                        value = args[i++];
                    }
                    uriResolverClass = value;
                } else if (option.equals("repeat")) {
                    i++;
                    if (value == null) {
                        badUsage(command, "No number after -repeat");
                    } else {
                        try {
                            repeat = Integer.parseInt(value);
                        } catch (NumberFormatException err) {
                            badUsage(command, "Bad number after -repeat");
                        }
                    }
                } else if (option.equals("s")) {
                    i++;
                    if (value == null) {
                        if (args.length < i + 2) {
                            badUsage(command, "No source file name after -s");
                        }
                        value = args[i++];
                    }
                    sourceFileName = value;
                } else if (option.equals("sa")) {
                    // already handled
                    i++;
                } else if (option.equals("snone")) {
                    config.setStripsWhiteSpace(Whitespace.NONE);
                    i++;
                } else if (option.equals("sall")) {
                    config.setStripsWhiteSpace(Whitespace.ALL);
                    i++;
                } else if (option.equals("signorable")) {
                    config.setStripsWhiteSpace(Whitespace.IGNORABLE);
                    i++;
                } else if (option.equals("strip")) {
                    i++;
                    if (value == null) {
                        value = "all";
                    }
                    if ("none".equals(value)) {
                        // no action||  || "ignorable".equals(value)) {
                    } else if ("all".equals(value)) {
                        config.setStripsWhiteSpace(Whitespace.ALL);
                    } else if ("ignorable".equals(value)) {
                        config.setStripsWhiteSpace(Whitespace.IGNORABLE);
                    } else {
                        badUsage(command, "-strip must be none, all, or ignorable");
                    }
                } else if (option.equals("t")) {
                    System.err.println(config.getProductTitle());
                    System.err.println(Configuration.getPlatform().getPlatformVersion());
                    config.setTiming(true);
                    showTime = true;
                    i++;
                } else if (option.equals("traceout")) {
                    i++;
                    if (value.equals("#err")) {
                        // no action, this is the default
                    } else if (value.equals("#out")) {
                        dynamicEnv.setTraceFunctionDestination(System.out);
                    } else if (value.equals("#null")) {
                        dynamicEnv.setTraceFunctionDestination(null);
                    } else {
                        try {
                            dynamicEnv.setTraceFunctionDestination(
                                    new PrintStream(new FileOutputStream(new File(value))));
                            closeTraceDestination = true;
                        } catch (FileNotFoundException e) {
                            badUsage(command, "Trace output file " + value + " cannot be created");
                        }
                    }
                } else if (option.equals("tree")) {
                    if ("linked".equals(value)) {
                        config.setTreeModel(Builder.LINKED_TREE);
                    } else if ("tiny".equals(value)) {
                        config.setTreeModel(Builder.TINY_TREE);
                    } else {
                        badUsage(command, "-tree option must be 'linked' or 'tiny'");
                    }
                    i++;
                } else if (option.equals("T")) {
                    i++;
                    if (value == null) {
                        config.setTraceListener(new XQueryTraceListener());
                    } else {
                        config.setTraceListenerClass(value);
                    }
                    config.setLineNumbering(true);
                } else if (option.equals("TJ")) {
                    i++;
                    config.setTraceExternalFunctions(true);
                } else if (option.equals("TL")) {
                    if (args.length < i + 2) {
                        badUsage(command, "No TraceListener class specified");
                    }
                    config.setTraceListenerClass(args[++i]);
                    config.setLineNumbering(true);
                    i++;
                } else if (option.equals("u")) {
                    useURLs = true;
                    i++;
                } else if (option.equals("update")) {
                    i++;
                    if (!(value == null || "on".equals(value) || "off".equals(value) || "discard".equals(value))) {
                        badUsage(command, "-update option must be on|off|discard");
                    }
                    if (!"off".equals(value)) {
                        updating = true;
                    }
                    writeback = !("discard".equals(value));
                } else if (option.equals("untyped")) {
                    // TODO: this is an experimental undocumented option. It should be checked for consistency
                    config.setAllNodesUntyped(true);
                    i++;
                } else if (option.equals("v")) {
                    config.setValidation(true);
                    i++;
                } else if (option.equals("val")) {
                    if (!schemaAware) {
                        quit("The -val option requires a schema-aware processor", 2);
                    } else if (value == null || "strict".equals(value)) {
                        config.setSchemaValidationMode(Validation.STRICT);
                    } else if ("lax".equals(value)) {
                        config.setSchemaValidationMode(Validation.LAX);
                    } else {
                        badUsage(command, "-val option must be 'strict' or 'lax'");
                    }
                    i++;
                } else if (option.equals("vlax")) {
                    if (schemaAware) {
                        config.setSchemaValidationMode(Validation.LAX);
                    } else {
                        quit("The -vlax option requires a schema-aware processor", 2);
                    }
                    i++;
                } else if (option.equals("vw")) {
                    if (schemaAware) {
                        config.setValidationWarnings(true);
                    } else {
                        quit("The -vw option requires a schema-aware processor", 2);
                    }
                    i++;
                } else if (option.equals("wrap")) {
                    if (!(value == null || "on".equals(value) || "off".equals(value))) {
                        badUsage(command, "-wrap option must be -wrap:on or -wrap:off");
                    }
                    if (!"off".equals(value)) {
                        wrap = true;
                    }
                    i++;
                } else if (option.equals("x")) {
                    i++;
                    config.setSourceParserClass(value);
                } else if (option.equals("xi")) {
                    if (!(value == null || "on".equals(value) || "off".equals(value))) {
                        badUsage(command, "-xi option must be -xi:on or -xi:off");
                    }
                    if (!"off".equals(value)) {
                        config.setXIncludeAware(true);
                    }
                    i++;
                } else if (option.equals("1.1")) {
                    config.setXMLVersion(Configuration.XML11);
                    i++;
                } else if (option.equals("xmlversion")) {
                    i++;
                    if ("1.0".equals(value)) {
                        config.setXMLVersion(Configuration.XML10);
                    } else if ("1.1".equals(value)) {
                        config.setXMLVersion(Configuration.XML11);
                    } else {
                        badUsage(command, "-xmlversion must be 1.0 or 1.1");
                    }
                } else if (option.equals("xsd")) {
                    i++;
                    additionalSchemas = value;
                } else if (option.equals("xsdversion")) {    // XSD 1.1
                    i++;
                    if (!("1.0".equals(value) | "1.1".equals(value))) {
                        badUsage(command, "-xsdversion must be 1.0 or 1.1");
                    }
                    config.setConfigurationProperty(FeatureKeys.XSD_VERSION, value);
                } else if (option.equals("xsiloc")) {
                    i++;
                    if ("off".equals(value)) {
                        config.setConfigurationProperty(FeatureKeys.USE_XSI_SCHEMA_LOCATION, Boolean.FALSE);
                    } else if ("on".equals(value)) {
                        config.setConfigurationProperty(FeatureKeys.USE_XSI_SCHEMA_LOCATION, Boolean.TRUE);
                    } else {
                        badUsage(value, "format: -xsiloc:(on|off)");
                    }
                } else if (args[i].equals("-?")) {
                    badUsage(command, "");
                } else if (args[i].equals("-")) {
                    queryFileName = "-";
                    i++;
                } else {
                    badUsage(command, "Unknown option " + args[i]);
                }
            } else {
                break;
            }
        }

        if (queryFileName == null) {
            if (args.length < i + 1) {
                badUsage(command, "No query file name");
            }
            queryFileName = args[i++];
        }

        for (int p = i; p < args.length; p++) {
            String arg = args[p];
            int eq = arg.indexOf("=");
            if (eq < 1 || eq >= arg.length()) {
                badUsage(command, "Bad param=value pair on command line: " + arg);
            }
            String argname = arg.substring(0, eq);
            String argvalue = (eq == arg.length() ? "" : arg.substring(eq + 1));
            if (argname.startsWith("!")) {
                // parameters starting with "!" are taken as output properties
                outputProps.setProperty(argname.substring(1), argvalue);
            } else if (argname.startsWith("+")) {
                // parameters starting with "+" are taken as input documents
                Object sources = Transform.loadDocuments(argvalue, useURLs, config, true);
                dynamicEnv.setParameter(argname.substring(1), sources);
            } else {
                dynamicEnv.setParameter(argname, new UntypedAtomicValue(argvalue));
            }
        }

        if (additionalSchemas != null) {
            loadAdditionalSchemas(config, additionalSchemas);
        }
    }

    protected static void loadAdditionalSchemas(Configuration config, String additionalSchemas)
            throws TransformerException {
        StringTokenizer st = new StringTokenizer(additionalSchemas, ";");
        while (st.hasMoreTokens()) {
            String schema = st.nextToken();
            File schemaFile = new File(schema);
            if (!schemaFile.exists()) {
                throw new TransformerException("Schema document " + schema + " not found");
            }
            config.addSchemaSource(new StreamSource(schemaFile));
        }
    }

    protected Source processSourceFile(String sourceFileName, boolean useURLs) throws TransformerException {
        Source sourceInput;
        if (useURLs || sourceFileName.startsWith("http:") || sourceFileName.startsWith("file:")) {
            sourceInput = config.getURIResolver().resolve(sourceFileName, null);
            if (sourceInput == null) {
                sourceInput = config.getSystemURIResolver().resolve(sourceFileName, null);
            }
        } else if (sourceFileName.equals("-")) {
            // take input from stdin
            sourceInput = new StreamSource(System.in);
        } else {
            File sourceFile = new File(sourceFileName);
            if (!sourceFile.exists()) {
                quit("Source file " + sourceFile + " does not exist", 2);
            }

            if (Configuration.getPlatform().isJava()) {
                InputSource eis = new InputSource(sourceFile.toURI().toString());
                sourceInput = new SAXSource(eis);
            } else {
                sourceInput = new StreamSource(sourceFile.toURI().toString());
            }
        }
        return sourceInput;
    }

    /**
     * Compile the query
     *
     * @param staticEnv     the static query context
     * @param queryFileName the filename holding the query (or "-" for the standard input)
     * @param useURLs       true if the filename is in the form of a URI
     * @return the compiled query
     * @throws XPathException if query compilation fails
     * @throws IOException    if the query cannot be read
     */

    protected XQueryExpression compileQuery(StaticQueryContext staticEnv, String queryFileName, boolean useURLs)
            throws XPathException, IOException {
        XQueryExpression exp;
        if (queryFileName.equals("-")) {
            Reader queryReader = new InputStreamReader(System.in);
            exp = staticEnv.compileQuery(queryReader);
        } else if (queryFileName.startsWith("{") && queryFileName.endsWith("}")) {
            // query is inline on the command line
            String q = queryFileName.substring(1, queryFileName.length() - 1);
            exp = staticEnv.compileQuery(q);
        } else if (useURLs || queryFileName.startsWith("http:") || queryFileName.startsWith("file:")) {
            ModuleURIResolver resolver = staticEnv.getModuleURIResolver();
            boolean isStandardResolver = false;
            if (resolver == null) {
                resolver = staticEnv.getConfiguration().getStandardModuleURIResolver();
                isStandardResolver = true;
            }
            while (true) {
                String[] locations = {queryFileName};
                Source[] sources;
                try {
                    sources = resolver.resolve(null, null, locations);
                } catch (Exception e) {
                    if (e instanceof XPathException) {
                        throw (XPathException)e;
                    } else {
                        XPathException err = new XPathException("Exception in ModuleURIResolver: ", e);
                        err.setErrorCode("XQST0059");
                        throw err;
                    }
                }
                if (sources == null) {
                    if (isStandardResolver) {
                        // this should not happen
                        quit("System problem: standard ModuleURIResolver returned null", 4);
                    } else {
                        resolver = staticEnv.getConfiguration().getStandardModuleURIResolver();
                        isStandardResolver = true;
                    }
                } else {
                    if (sources.length != 1 || !(sources[0] instanceof StreamSource)) {
                        quit("Module URI Resolver must return a single StreamSource", 2);
                    }
                    String queryText = QueryReader.readSourceQuery((StreamSource)sources[0], config.getNameChecker());
                    exp = staticEnv.compileQuery(queryText);
                    break;
                }
            }
        } else {
            InputStream queryStream = new FileInputStream(queryFileName);
            staticEnv.setBaseURI(new File(queryFileName).toURI().toString());
            exp = staticEnv.compileQuery(queryStream, null);
        }
        return exp;
    }

    /**
     * Explain the results of query compilation
     *
     * @param exp the compiled expression
     * @throws FileNotFoundException if the destination for the explanation doesn't exist
     * @throws XPathException        if other failures occur
     */

    protected void explain(XQueryExpression exp) throws FileNotFoundException, XPathException {
        OutputStream explainOutput;
        if (explainOutputFileName == null) {
            explainOutput = System.err;
        } else {
            explainOutput = new FileOutputStream(new File(explainOutputFileName));
        }
        Properties props = new Properties();
        props.setProperty(OutputKeys.METHOD, "xml");
        props.setProperty(OutputKeys.INDENT, "yes");
        props.setProperty(SaxonOutputKeys.INDENT_SPACES, "2");
        Receiver diag = config.getSerializerFactory().getReceiver(
                new StreamResult(explainOutput),
                config.makePipelineConfiguration(),
                props);
        ExpressionPresenter expressionPresenter = new ExpressionPresenter(config, diag);
        exp.explain(expressionPresenter);
    }

    /**
     * Process the supplied source file
     *
     * @param sourceInput the supplied source
     * @param exp         the compiled XQuery expression
     * @param dynamicEnv  the dynamic query context
     * @throws XPathException if processing fails
     */

    protected void processSource(Source sourceInput, XQueryExpression exp, DynamicQueryContext dynamicEnv) throws XPathException {
        if (sourceInput != null) {
            if (showTime) {
                System.err.println("Processing " + sourceInput.getSystemId());
            }
            if (!exp.usesContextItem()) {
                System.err.println("Source document ignored - query does not access the context item");
                sourceInput = null;

            } else if (projection) {
                PathMap map = exp.getPathMap();
                PathMap.PathMapRoot contextRoot = map.getContextRoot();
                if (explain) {
                    System.err.println("DOCUMENT PROJECTION: PATH MAP");
                    map.diagnosticDump(System.err);
                }
                if (contextRoot != null) {
                    if (contextRoot.hasUnknownDependencies()) {
                        System.err.println("Document projection for the context document is not possible, " +
                                "because the query uses paths that defy analysis");
                    } else {
                        ProxyReceiver filter = config.makeDocumentProjector(contextRoot);
                        sourceInput = AugmentedSource.makeAugmentedSource(sourceInput);
                        ((AugmentedSource)sourceInput).addFilter(filter);
                    }
                } else {
                    System.err.println("Source document supplied, but query does not access the context item");
                }
            }
            if (sourceInput != null) {
                DocumentInfo doc = config.buildDocument(sourceInput);
                dynamicEnv.setContextItem(doc);
            }
        }
    }

    /**
     * Run the query
     *
     * @param exp         the compiled query expression
     * @param dynamicEnv  the dynamic query context
     * @param destination the destination for serialized results
     * @param outputProps serialization properties defining the output format
     * @throws XPathException if the query fails
     * @throws IOException    if input or output fails
     */
    protected void runQuery(XQueryExpression exp, DynamicQueryContext dynamicEnv,
                            OutputStream destination, final Properties outputProps)
            throws XPathException, IOException {
        if (exp.getExpression().isUpdatingExpression() && updating) {

            if (writeback) {
                final List errors = new ArrayList(3);
                UpdateAgent agent = new UpdateAgent() {
                    public void update(NodeInfo node, Controller controller) throws XPathException {
                        try {
                            DocumentPool pool = controller.getDocumentPool();
                            String documentURI = pool.getDocumentURI(node);
                            if (documentURI != null) {
                                QueryResult.rewriteToDisk(node, outputProps, backup, (showTime ? System.err : null));
                            } else if (showTime) {
                                System.err.println("Updated document discarded because it was not read using doc()");
                            }
                        } catch (XPathException err) {
                            System.err.println(err.getMessage());
                            errors.add(err);
                        }
                    }
                };
                exp.runUpdate(dynamicEnv, agent);

                if (!errors.isEmpty()) {
                    throw (XPathException)errors.get(0);
                }
            } else {
                Set affectedDocuments = exp.runUpdate(dynamicEnv);
                if (affectedDocuments.contains(dynamicEnv.getContextItem())) {
                    QueryResult.serialize((NodeInfo)dynamicEnv.getContextItem(),
                            new StreamResult(destination),
                            outputProps);
                }
            }
        } else if (wrap && !pullMode) {
            SequenceIterator results = exp.iterator(dynamicEnv);
            DocumentInfo resultDoc = QueryResult.wrap(results, config);
            QueryResult.serialize(resultDoc,
                    new StreamResult(destination),
                    outputProps);
            destination.close();
        } else if (pullMode) {
            if (wrap) {
                outputProps.setProperty(SaxonOutputKeys.WRAP, "yes");
            }
            //outputProps.setProperty(OutputKeys.METHOD, "xml");
            //outputProps.setProperty(OutputKeys.INDENT, "yes");
            exp.pull(dynamicEnv, new StreamResult(destination), outputProps);
        } else {
            exp.run(dynamicEnv, new StreamResult(destination), outputProps);
        }
        if (closeTraceDestination) {
            dynamicEnv.getTraceFunctionDestination().close();
        }                     
    }

    /**
     * Exit with a message
     *
     * @param message The message to be output
     * @param code    The result code to be returned to the operating
     *                system shell
     */

    protected static void quit(String message, int code) {
        System.err.println(message);
        System.exit(code);
    }

//    public void setPOption(Configuration config) {
//        config.getSystemURIResolver().setRecognizeQueryParameters(true);
//    }

    /**
     * Report incorrect usage of the command line, with a list of the options and arguments that are available
     *
     * @param name    The name of the command being executed (allows subclassing)
     * @param message The error message
     */
    protected void badUsage(String name, String message) {
        if (!"".equals(message)) {
            System.err.println(message);
        }
        System.err.println(config.getProductTitle());
        System.err.println("Usage: " + name + " [options] query {param=value}...");
        System.err.println("Options: ");
        System.err.println("  -backup:on|off        Save updated documents before overwriting");
        System.err.println("  -cr:classname         Use specified CollectionURIResolver class");
        System.err.println("  -dtd:on|off           Validate using DTD");
        System.err.println("  -expand:on|off        Expand defaults defined in schema/DTD");
        System.err.println("  -explain[:filename]   Display compiled expression tree");
        System.err.println("  -ext:[on|off]         Allow|Disallow external Java functions");
        System.err.println("  -l:on|off             Line numbering for source document");
        System.err.println("  -mr:classname         Use specified ModuleURIResolver class");
        System.err.println("  -o:filename           Send output to named file");
        System.err.println("  -outval:recover|fatal Handling of validation errors on result document");
        System.err.println("  -p                    Recognize Saxon file extensions and query parameters");
        System.err.println("  -pipe:push|pull       Execute internally in push or pull mode");
        System.err.println("  -projection:[on|off]  Use|Don't use source document projection");
        System.err.println("  -q:filename           Query file name");
        System.err.println("  -qs:string            Query string (usually in quotes)");
        System.err.println("  -r:classname          Use URIResolver class");
        System.err.println("  -repeat:N             Repeat N times for performance measurement");
        System.err.println("  -s:file|URI           Provide initial context document");
        System.err.println("  -sa                   Schema-aware query (requires Saxon-SA)");
        System.err.println("  -strip:all|none|ignorable      Strip whitespace text nodes");
        System.err.println("  -t                    Display version and timing information");
        System.err.println("  -traceout:file|#null  Destination for fn:trace() output");
        System.err.println("  -tree:tiny|linked     Select tree model");
        System.err.println("  -T[:classname]        Use TraceListener class");
        System.err.println("  -TJ                   Trace calls to external Java functions");
        System.err.println("  -u                    Names are URLs not filenames");
        System.err.println("  -update:on|off|discard  Enable|Disable XQuery Update (needs Saxon-SA)");
        System.err.println("  -val:strict|lax       Validate using schema");
        System.err.println("  -wrap:on|off          Wrap result sequence in XML elements");
        System.err.println("  -x:classname          Parser (XMLReader) used for source files");
        System.err.println("  -xi:on|off            Expand XInclude on all documents");
        System.err.println("  -xmlversion:1.0|1.1   Version of XML to be handled");
        System.err.println("  -xsd:file;file..      Additional schema documents to be loaded");
        System.err.println("  -xsdlversion:1.0|1.1  Version of XML Schema to be used");
        System.err.println("  -xsiloc:on|off        Take note of xsi:schemaLocation");
        System.err.println("  -?                    Display this message ");
        System.err.println("  param=value           Set query string parameter");
        System.err.println("  +param=value          Set query document parameter");
        System.err.println("  !option=value         Set serialization option");
        if ("".equals(message)) {
            System.exit(0);
        } else {
            System.exit(2);
        }
    }

}

//
// The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
// you may not use this file except in compliance with the License. You may obtain a copy of the
// License at http://www.mozilla.org/MPL/
//
// Software distributed under the License is distributed on an "AS IS" basis,
// WITHOUT WARRANTY OF ANY KIND, either express or implied.
// See the License for the specific language governing rights and limitations under the License.
//
// The Original Code is: all this file.
//
// The Initial Developer of the Original Code is Michael H. Kay.
//
// Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
//
// Contributor(s): changes to allow source and/or stylesheet from stdin contributed by
// Gunther Schadow [gunther@aurora.regenstrief.org]
//
