| /* |
| * reserved comment block |
| * DO NOT REMOVE OR ALTER! |
| */ |
| /* |
| * 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. |
| */ |
| |
| package com.sun.org.apache.bcel.internal.classfile; |
| |
| |
| import com.sun.org.apache.bcel.internal.Constants; |
| import java.io.*; |
| import java.util.*; |
| |
| /** |
| * This class represents a reference to an unknown (i.e., |
| * application-specific) attribute of a class. It is instantiated from the |
| * <em>Attribute.readAttribute()</em> method. Applications that need to |
| * read in application-specific attributes should create an <a |
| * href="./AttributeReader.html">AttributeReader</a> implementation and |
| * attach it via <a |
| * href="./Attribute.html#addAttributeReader(java.lang.String, |
| * com.sun.org.apache.bcel.internal.classfile.AttributeReader)">Attribute.addAttributeReader</a>. |
| |
| * |
| * @see com.sun.org.apache.bcel.internal.classfile.Attribute |
| * @see com.sun.org.apache.bcel.internal.classfile.AttributeReader |
| * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> |
| */ |
| public final class Unknown extends Attribute { |
| private byte[] bytes; |
| private String name; |
| |
| private static HashMap unknown_attributes = new HashMap(); |
| |
| /** @return array of unknown attributes, but just one for each kind. |
| */ |
| static Unknown[] getUnknownAttributes() { |
| Unknown[] unknowns = new Unknown[unknown_attributes.size()]; |
| Iterator entries = unknown_attributes.values().iterator(); |
| |
| for(int i=0; entries.hasNext(); i++) |
| unknowns[i] = (Unknown)entries.next(); |
| |
| unknown_attributes.clear(); |
| return unknowns; |
| } |
| |
| /** |
| * Initialize from another object. Note that both objects use the same |
| * references (shallow copy). Use clone() for a physical copy. |
| */ |
| public Unknown(Unknown c) { |
| this(c.getNameIndex(), c.getLength(), c.getBytes(), c.getConstantPool()); |
| } |
| |
| /** |
| * Create a non-standard attribute. |
| * |
| * @param name_index Index in constant pool |
| * @param length Content length in bytes |
| * @param bytes Attribute contents |
| * @param constant_pool Array of constants |
| */ |
| public Unknown(int name_index, int length, byte[] bytes, |
| ConstantPool constant_pool) |
| { |
| super(Constants.ATTR_UNKNOWN, name_index, length, constant_pool); |
| this.bytes = bytes; |
| |
| name = ((ConstantUtf8)constant_pool.getConstant(name_index, |
| Constants.CONSTANT_Utf8)).getBytes(); |
| unknown_attributes.put(name, this); |
| } |
| |
| /** |
| * Construct object from file stream. |
| * @param name_index Index in constant pool |
| * @param length Content length in bytes |
| * @param file Input stream |
| * @param constant_pool Array of constants |
| * @throws IOException |
| */ |
| Unknown(int name_index, int length, DataInputStream file, |
| ConstantPool constant_pool) |
| throws IOException |
| { |
| this(name_index, length, (byte [])null, constant_pool); |
| |
| if(length > 0) { |
| bytes = new byte[length]; |
| file.readFully(bytes); |
| } |
| } |
| |
| /** |
| * Called by objects that are traversing the nodes of the tree implicitely |
| * defined by the contents of a Java class. I.e., the hierarchy of methods, |
| * fields, attributes, etc. spawns a tree of objects. |
| * |
| * @param v Visitor object |
| */ |
| public void accept(Visitor v) { |
| v.visitUnknown(this); |
| } |
| /** |
| * Dump unknown bytes to file stream. |
| * |
| * @param file Output file stream |
| * @throws IOException |
| */ |
| public final void dump(DataOutputStream file) throws IOException |
| { |
| super.dump(file); |
| if(length > 0) |
| file.write(bytes, 0, length); |
| } |
| /** |
| * @return data bytes. |
| */ |
| public final byte[] getBytes() { return bytes; } |
| |
| /** |
| * @return name of attribute. |
| */ |
| public final String getName() { return name; } |
| |
| /** |
| * @param bytes. |
| */ |
| public final void setBytes(byte[] bytes) { |
| this.bytes = bytes; |
| } |
| |
| /** |
| * @return String representation. |
| */ |
| public final String toString() { |
| if(length == 0 || bytes == null) |
| return "(Unknown attribute " + name + ")"; |
| |
| String hex; |
| if(length > 10) { |
| byte[] tmp = new byte[10]; |
| System.arraycopy(bytes, 0, tmp, 0, 10); |
| hex = Utility.toHexString(tmp) + "... (truncated)"; |
| } |
| else |
| hex = Utility.toHexString(bytes); |
| |
| return "(Unknown attribute " + name + ": " + hex + ")"; |
| } |
| |
| /** |
| * @return deep copy of this attribute |
| */ |
| public Attribute copy(ConstantPool constant_pool) { |
| Unknown c = (Unknown)clone(); |
| |
| if(bytes != null) |
| c.bytes = (byte[])bytes.clone(); |
| |
| c.constant_pool = constant_pool; |
| return c; |
| } |
| } |