| /* |
| * AttributeMap.java |
| * |
| * Sun Public License Notice |
| * |
| * The contents of this file are subject to the Sun Public License |
| * Version 1.0 (the "License"). You may not use this file except in |
| * compliance with the License. A copy of the License is available at |
| * http://www.sun.com/ |
| * |
| * The Original Code is NetBeans. The Initial Developer of the Original |
| * Code is Sun Microsystems, Inc. Portions Copyright 2000-2001 Sun |
| * Microsystems, Inc. All Rights Reserved. |
| * |
| * Contributor(s): Thomas Ball |
| * |
| * Version: $Revision$ |
| */ |
| |
| package org.netbeans.modules.classfile; |
| |
| import java.io.*; |
| import java.util.*; |
| |
| /** |
| * Class representing a map of classfile attributes. The |
| * keys for this map are the names of the attributes (as Strings, |
| * not constant pool indexes). The values are byte arrays that |
| * hold the contents of the attribute. |
| * |
| * Note: if a ClassFile is created with includeCode parameter set to |
| * false, then no AttributeMaps for the classfile's methods will |
| * have Code attributes. |
| * |
| * @author Thomas Ball |
| */ |
| public final class AttributeMap { |
| |
| Map map; |
| |
| /** |
| * Load zero or more attributes from a class, field or method. |
| */ |
| static AttributeMap load(DataInputStream in, ConstantPool pool) |
| throws IOException { |
| return load(in, pool, false); |
| } |
| |
| static AttributeMap load(DataInputStream in, ConstantPool pool, |
| boolean includeCode) throws IOException { |
| int count = in.readUnsignedShort(); |
| Map map = new HashMap(count + 1, (float)1.0); |
| for (int i = 0; i < count; i++) { |
| Object o = pool.get(in.readUnsignedShort()); |
| if (!(o instanceof CPUTF8Info)) |
| throw new InvalidClassFormatException(); |
| CPUTF8Info entry = (CPUTF8Info)o; |
| String name = entry.getName(); |
| int len = in.readInt(); |
| if (!includeCode && name.equals("Code")) { |
| int n; |
| while ((n = (int)in.skip(len)) > 0 && n < len) |
| len -= n; |
| } else { |
| byte[] attr = new byte[len]; |
| in.readFully(attr); |
| map.put(name, attr); |
| } |
| } |
| return new AttributeMap(map); |
| } |
| |
| AttributeMap(Map attributes) { |
| this.map = attributes; |
| } |
| |
| DataInputStream getStream(String name) { |
| byte[] attr = (byte[])map.get(name); |
| return attr != null ? |
| new DataInputStream(new ByteArrayInputStream(attr)) : null; |
| } |
| |
| /** |
| * Returns an array containing the bytes in a specified attribute. |
| * If the attribute exists but doesn't have any length (such as |
| * the <code>Deprecated</code> attribute), then a zero-length |
| * array is returned. If the attribute doesn't exist, then null |
| * is returned. |
| */ |
| byte[] get(String name) { |
| return (byte[])map.get(name); |
| } |
| |
| /** |
| * Returns the number of attributes in this map. |
| */ |
| public int size() { |
| return map.size(); |
| } |
| |
| /** |
| * Returns true if no attributes exist in this map. |
| */ |
| public boolean isEmpty() { |
| return map.isEmpty(); |
| } |
| |
| /** |
| * Returns true if an attribute of the specified name exists in this map. |
| */ |
| public boolean containsAttribute(String key) { |
| return map.containsKey(key); |
| } |
| |
| /** |
| * Returns a set of names of all of the attributes in this map. |
| */ |
| public Set keySet() { |
| return map.keySet(); |
| } |
| |
| } |