/*
 * Copyright 2012, Google Inc.
 * 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 Google Inc. 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 org.jf.dexlib2.base;

import org.jf.dexlib2.ValueType;
import org.jf.dexlib2.base.reference.BaseTypeReference;
import org.jf.dexlib2.iface.Annotation;
import org.jf.dexlib2.iface.AnnotationElement;
import org.jf.dexlib2.iface.MethodParameter;
import org.jf.dexlib2.iface.value.ArrayEncodedValue;
import org.jf.dexlib2.iface.value.EncodedValue;
import org.jf.dexlib2.iface.value.StringEncodedValue;

import javax.annotation.Nullable;

public abstract class BaseMethodParameter extends BaseTypeReference implements MethodParameter {
    @Nullable
    @Override
    public String getSignature() {
        Annotation signatureAnnotation = null;
        for (Annotation annotation: getAnnotations()) {
            if (annotation.getType().equals("Ldalvik/annotation/Signature;")) {
                signatureAnnotation = annotation;
                break;
            }
        }
        if (signatureAnnotation == null) {
            return null;
        }

        ArrayEncodedValue signatureValues = null;
        for (AnnotationElement annotationElement: signatureAnnotation.getElements()) {
            if (annotationElement.getName().equals("value")) {
                EncodedValue encodedValue = annotationElement.getValue();
                if (encodedValue.getValueType() != ValueType.ARRAY) {
                    return null;
                }
                signatureValues = (ArrayEncodedValue)encodedValue;
                break;
            }
        }
        if (signatureValues == null) {
            return null;
        }

        StringBuilder sb = new StringBuilder();
        for (EncodedValue signatureValue: signatureValues.getValue()) {
            if (signatureValue.getValueType() != ValueType.STRING) {
                return null;
            }
            sb.append(((StringEncodedValue)signatureValue).getValue());
        }
        return sb.toString();
    }
}
