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/*
 * Javassist, a Java-bytecode translator toolkit.
 * Copyright (C) 1999- Shigeru Chiba. All Rights Reserved.
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License.  Alternatively, the contents of this file may be used under
 * the terms of the GNU Lesser General Public License Version 2.1 or later,
 * or the Apache License Version 2.0.
 *
 * 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.
 *
 * MODIFIED BY James Nelson of We The Internet, 2013.
 * Repackaged to avoid conflicts with different versions of Javassist,
 * and modified Javassist APIs to make them more accessible to outside code.
 */
package xapi.bytecode.attributes;

import java.io.DataInput;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import java.util.Map;

import xapi.bytecode.ConstPool;
import xapi.bytecode.annotation.AnnotationDefaultAttribute;
import xapi.bytecode.annotation.AnnotationsAttribute;


public class AttributeInfo {
  protected ConstPool constPool;
  protected int name;
  protected byte[] info;

  protected AttributeInfo(ConstPool cp, int attrname, byte[] attrinfo) {
      constPool = cp;
      name = attrname;
      info = attrinfo;
  }

  protected AttributeInfo(ConstPool cp, String attrname) {
      this(cp, attrname, (byte[])null);
  }

  /**
   * Constructs an attribute_info structure.
   *
   * @param cp                constant pool table
   * @param attrname          attribute name
   * @param attrinfo          info field
   *                          of attribute_info structure.
   */
  public AttributeInfo(ConstPool cp, String attrname, byte[] attrinfo) {
      this(cp, cp.addUtf8Info(attrname), attrinfo);
  }

  protected AttributeInfo(ConstPool cp, int n, DataInput in)
      throws IOException
  {
      constPool = cp;
      name = n;
      int len = in.readInt();
      info = new byte[len];
      if (len > 0) {
        in.readFully(info);
      }
  }

  public static AttributeInfo read(ConstPool cp, DataInput in)
      throws IOException
  {
      int name = in.readUnsignedShort();
      String nameStr = cp.getUtf8Info(name);
      if (nameStr.charAt(0) < 'L') {
        switch(nameStr) {
          case AnnotationDefaultAttribute.tag:
            return new AnnotationDefaultAttribute(cp, name, in);
          case ConstantAttribute.tag:
            return new ConstantAttribute(cp, name, in);
          case InnerClassesAttribute.tag:
            return new InnerClassesAttribute(cp, name, in);
          case ExceptionsAttribute.tag:
            return new ExceptionsAttribute(cp, name, in);
          case CodeAttribute.tag:
            return new CodeAttribute(cp, name, in);
        }
      }
      else {
          /* Note that the names of Annotations attributes begin with 'R'.
           */
         if (nameStr.equals(AnnotationsAttribute.visibleTag)
                   || nameStr.equals(AnnotationsAttribute.invisibleTag)) {
              // RuntimeVisibleAnnotations or RuntimeInvisibleAnnotations
              return new AnnotationsAttribute(cp, name, in);
          }
          else if (nameStr.equals(SignatureAttribute.tag)) {
            return new SignatureAttribute(cp, name, in);
          } else if (nameStr.equals(SourceFileAttribute.tag)) {
            return new SourceFileAttribute(cp, name, in);
          }
      }

      return new AttributeInfo(cp, name, in);
  }

  /**
   * Returns an attribute name.
   */
  public String getName() {
      return constPool.getUtf8Info(name);
  }

  /**
   * Returns a constant pool table.
   */
  public ConstPool getConstPool() { return constPool; }

  /**
   * Returns the length of this attribute_info
   * structure.
   * The returned value is attribute_length + 6.
   */
  public int length() {
      return info.length + 6;
  }

  /**
   * Returns the info field
   * of this attribute_info structure.
   *
   * 

This method is not available if the object is an instance * of CodeAttribute. */ public byte[] get() { return info; } /** * Sets the info field * of this attribute_info structure. * *

This method is not available if the object is an instance * of CodeAttribute. */ public void set(byte[] newinfo) { info = newinfo; } /** * Makes a copy. Class names are replaced according to the * given Map object. * * @param newCp the constant pool table used by the new copy. * @param classnames pairs of replaced and substituted * class names. */ public AttributeInfo copy(ConstPool newCp, Map classnames) { int s = info.length; byte[] srcInfo = info; byte[] newInfo = new byte[s]; for (int i = 0; i < s; ++i) { newInfo[i] = srcInfo[i]; } return new AttributeInfo(newCp, getName(), newInfo); } void write(DataOutputStream out) throws IOException { out.writeShort(name); out.writeInt(info.length); if (info.length > 0) { out.write(info); } } public static int getLength(ArrayList list) { int size = 0; int n = list.size(); for (int i = 0; i < n; ++i) { AttributeInfo attr = (AttributeInfo)list.get(i); size += attr.length(); } return size; } public static AttributeInfo lookup(ArrayList list, String name) { if (list == null) { return null; } ListIterator iterator = list.listIterator(); while (iterator.hasNext()) { AttributeInfo ai = (AttributeInfo)iterator.next(); if (ai.getName().equals(name)) { return ai; } } return null; // no such attribute } public static synchronized void remove(ArrayList list, String name) { if (list == null) { return; } ListIterator iterator = list.listIterator(); while (iterator.hasNext()) { AttributeInfo ai = (AttributeInfo)iterator.next(); if (ai.getName().equals(name)) { iterator.remove(); } } } public static void writeAll(ArrayList list, DataOutputStream out) throws IOException { if (list == null) { return; } int n = list.size(); for (int i = 0; i < n; ++i) { AttributeInfo attr = (AttributeInfo)list.get(i); attr.write(out); } } public static ArrayList copyAll(ArrayList list, ConstPool cp) { if (list == null) { return null; } ArrayList newList = new ArrayList(); int n = list.size(); for (int i = 0; i < n; ++i) { AttributeInfo attr = (AttributeInfo)list.get(i); newList.add(attr.copy(cp, null)); } return newList; } /* The following two methods are used to implement * ClassFile.renameClass(). * Only CodeAttribute and LocalVariableAttribute override * this method. */ void renameClass(String oldname, String newname) {} void renameClass(Map classnames) {} public static void renameClass(List attributes, String oldname, String newname) { Iterator iterator = attributes.iterator(); while (iterator.hasNext()) { AttributeInfo ai = (AttributeInfo)iterator.next(); ai.renameClass(oldname, newname); } } public static void renameClass(List attributes, Map classnames) { Iterator iterator = attributes.iterator(); while (iterator.hasNext()) { AttributeInfo ai = (AttributeInfo)iterator.next(); ai.renameClass(classnames); } } }





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