Package org.aspectj.apache.bcel.classfile

Source Code of org.aspectj.apache.bcel.classfile.FieldOrMethod

package org.aspectj.apache.bcel.classfile;

/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2001 The Apache Software Foundation.  All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
*
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*    notice, this list of conditions and the following disclaimer in
*    the documentation and/or other materials provided with the
*    distribution.
*
* 3. The end-user documentation included with the redistribution,
*    if any, must include the following acknowledgment:
*       "This product includes software developed by the
*        Apache Software Foundation (http://www.apache.org/)."
*    Alternately, this acknowledgment may appear in the software itself,
*    if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" and
*    "Apache BCEL" must not be used to endorse or promote products
*    derived from this software without prior written permission. For
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*
* 5. Products derived from this software may not be called "Apache",
*    "Apache BCEL", nor may "Apache" appear in their name, without
*    prior written permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation.  For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.aspectj.apache.bcel.Constants;
import org.aspectj.apache.bcel.classfile.annotation.AnnotationGen;
import org.aspectj.apache.bcel.classfile.annotation.RuntimeAnnos;

/**
* Abstract super class for fields and methods.
*
* @version $Id: FieldOrMethod.java,v 1.12 2009/09/15 19:40:12 aclement Exp $
* @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
*/
public abstract class FieldOrMethod extends Modifiers implements Node {
  protected int nameIndex;
  protected int signatureIndex;
  protected Attribute[] attributes;

  protected ConstantPool cpool;
  private String name; // lazily initialized
  private String signature; // lazily initialized
  private AnnotationGen[] annotations; // lazily initialized
  private String signatureAttributeString = null;
  private boolean searchedForSignatureAttribute = false;

  protected FieldOrMethod() {
  }

  /**
   * Initialize from another object. Note that both objects use the same references (shallow copy). Use clone() for a physical
   * copy.
   */
  protected FieldOrMethod(FieldOrMethod c) {
    this(c.getModifiers(), c.getNameIndex(), c.getSignatureIndex(), c.getAttributes(), c.getConstantPool());
  }

  protected FieldOrMethod(DataInputStream file, ConstantPool cpool) throws IOException {
    this(file.readUnsignedShort(), file.readUnsignedShort(), file.readUnsignedShort(), null, cpool);
    attributes = AttributeUtils.readAttributes(file, cpool);
  }

  protected FieldOrMethod(int accessFlags, int nameIndex, int signatureIndex, Attribute[] attributes, ConstantPool cpool) {
    this.modifiers = accessFlags;
    this.nameIndex = nameIndex;
    this.signatureIndex = signatureIndex;
    this.cpool = cpool;
    this.attributes = attributes;
  }

  /**
   * @param attributes Collection of object attributes.
   */
  public void setAttributes(Attribute[] attributes) {
    this.attributes = attributes;
  }

  public final void dump(DataOutputStream file) throws IOException {
    file.writeShort(modifiers);
    file.writeShort(nameIndex);
    file.writeShort(signatureIndex);
    AttributeUtils.writeAttributes(attributes, file);
  }

  public final Attribute[] getAttributes() {
    return attributes;
  }

  public final ConstantPool getConstantPool() {
    return cpool;
  }

  public final int getNameIndex() {
    return nameIndex;
  }

  public final int getSignatureIndex() {
    return signatureIndex;
  }

  public final String getName() {
    if (name == null) {
      ConstantUtf8 c = (ConstantUtf8) cpool.getConstant(nameIndex, Constants.CONSTANT_Utf8);
      name = c.getValue();
    }
    return name;
  }

  public final String getSignature() {
    if (signature == null) {
      ConstantUtf8 c = (ConstantUtf8) cpool.getConstant(signatureIndex, Constants.CONSTANT_Utf8);
      signature = c.getValue();
    }
    return signature;
  }

  /**
   * This will return the contents of a signature attribute attached to a member, or if there is none it will return the same as
   * 'getSignature()'. Signature attributes are attached to members that were declared generic.
   */
  public final String getDeclaredSignature() {
    if (getGenericSignature() != null)
      return getGenericSignature();
    return getSignature();
  }

  public AnnotationGen[] getAnnotations() {
    // Ensure we have unpacked any attributes that contain annotations.
    // We don't remove these annotation attributes from the attributes list, they
    // remain there.
    if (annotations == null) {
      // Find attributes that contain annotation data
      List<AnnotationGen> accumulatedAnnotations = new ArrayList<AnnotationGen>();
      for (int i = 0; i < attributes.length; i++) {
        Attribute attribute = attributes[i];
        if (attribute instanceof RuntimeAnnos) {
          RuntimeAnnos runtimeAnnotations = (RuntimeAnnos) attribute;
          accumulatedAnnotations.addAll(runtimeAnnotations.getAnnotations());
        }
      }
      if (accumulatedAnnotations.size() == 0) {
        annotations = AnnotationGen.NO_ANNOTATIONS;
      } else {
        annotations = accumulatedAnnotations.toArray(new AnnotationGen[] {});
      }
    }
    return annotations;
  }

  /**
   * Hunts for a signature attribute on the member and returns its contents. So where the 'regular' signature may be
   * (Ljava/util/Vector;)V the signature attribute may in fact say 'Ljava/lang/Vector<Ljava/lang/String>;' Coded for performance -
   * searches for the attribute only when requested - only searches for it once.
   */
  public final String getGenericSignature() {
    if (!searchedForSignatureAttribute) {
      Signature sig = AttributeUtils.getSignatureAttribute(attributes);
      signatureAttributeString = (sig == null ? null : sig.getSignature());
      searchedForSignatureAttribute = true;
    }
    return signatureAttributeString;
  }

}
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