| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| /* |
| * Contributor(s): Thomas Ball |
| */ |
| |
| 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<String,byte[]> 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<String,byte[]> map = new HashMap<String,byte[]>(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 && "Code".equals(name)) { |
| 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<String,byte[]> attributes) { |
| this.map = attributes; |
| } |
| |
| DataInputStream getStream(String name) { |
| byte[] attr = 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 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<String> keySet() { |
| return map.keySet(); |
| } |
| |
| } |