/*
 * Copyright (c) 2008, Aaron Digulla
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *     * Neither the name of Aaron Digulla nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */
package de.pdark.decentxml;

import de.pdark.decentxml.XMLTokenizer.Type;

public class ProcessingInstruction extends BasicNode implements TextNode {
  private String target;
  private String whitespace;
  private String text;

  public ProcessingInstruction(Token token) {
    super(token);

    int pos = 2;
    int pos2 = pos;
    String xml = token.getText();
    while (pos2 < xml.length()) {
      char c = xml.charAt(pos2);
      if (Character.isWhitespace(c) || c == '?') break;
      pos2++;
    }

    if (pos == pos2)
      throw new XMLParseException("Missing target name in processing instruction", token);

    target = xml.substring(pos, pos2);

    while (pos2 < xml.length()) {
      char c = xml.charAt(pos2);
      if (!Character.isWhitespace(c) || c == '?') break;
      pos2++;
    }

    pos = Math.min(pos2, xml.length() - 2);
    pos2 = xml.length() - 2;
    text = xml.substring(pos, pos2);
  }

  public ProcessingInstruction(String target) {
    this(target, null);
  }

  public ProcessingInstruction(String target, String text) {
    super(Type.PROCESSING_INSTRUCTION, null);

    if (target == null) throw new IllegalArgumentException("target is null");
    if (target.trim().length() == 0) throw new IllegalArgumentException("target is blank or empty");
    if (text == null) text = "";
    if (text.contains("?>")) throw new IllegalArgumentException("text must not contain '?>'");

    this.target = target.trim();
    this.whitespace = "";
    this.text = text;
    updateValue();
  }

  protected void updateValue() {
    int pos;
    for (pos = 0; pos < text.length(); pos++) {
      char c = text.charAt(pos);
      if (!Character.isWhitespace(c)) break;
    }

    if (pos == 0 && text.length() != 0) whitespace = " ";
    else whitespace = "";

    setValue("<?" + target + whitespace + text + "?>");
  }

  public String getTarget() {
    return target;
  }

  public void setTarget(String target) {
    this.target = target;
    updateValue();
  }

  public String getText() {
    return text;
  }

  public ProcessingInstruction setText(String text) {
    this.text = text;
    updateValue();
    return this;
  }

  @Override
  public ProcessingInstruction createClone() {
    return new ProcessingInstruction(target, text);
  }

  @Override
  public ProcessingInstruction copy(Node orig) {
    super.copy(orig);

    ProcessingInstruction other = (ProcessingInstruction) orig;

    this.target = other.target;
    this.text = other.text;
    this.whitespace = other.whitespace;

    return this;
  }

  @Override
  public ProcessingInstruction copy() {
    return (ProcessingInstruction) super.copy();
  }
}
