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217 lines
7.1 KiB
217 lines
7.1 KiB
/*
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* Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*/
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package com.sun.org.apache.bcel.internal.classfile;
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/* ====================================================================
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* The Apache Software License, Version 1.1
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*
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* Copyright (c) 2001 The Apache Software Foundation. All rights
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* reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The end-user documentation included with the redistribution,
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* if any, must include the following acknowledgment:
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* "This product includes software developed by the
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* Apache Software Foundation (http://www.apache.org/)."
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* Alternately, this acknowledgment may appear in the software itself,
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* if and wherever such third-party acknowledgments normally appear.
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*
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* 4. The names "Apache" and "Apache Software Foundation" and
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* "Apache BCEL" must not be used to endorse or promote products
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* derived from this software without prior written permission. For
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* written permission, please contact apache@apache.org.
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*
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* 5. Products derived from this software may not be called "Apache",
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* "Apache BCEL", nor may "Apache" appear in their name, without
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* prior written permission of the Apache Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*/
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import com.sun.org.apache.bcel.internal.Constants;
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import java.io.*;
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import java.util.*;
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/**
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* This class represents a reference to an unknown (i.e.,
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* application-specific) attribute of a class. It is instantiated from the
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* <em>Attribute.readAttribute()</em> method. Applications that need to
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* read in application-specific attributes should create an <a
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* href="./AttributeReader.html">AttributeReader</a> implementation and
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* attach it via <a
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* href="./Attribute.html#addAttributeReader(java.lang.String,
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* com.sun.org.apache.bcel.internal.classfile.AttributeReader)">Attribute.addAttributeReader</a>.
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*
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* @see com.sun.org.apache.bcel.internal.classfile.Attribute
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* @see com.sun.org.apache.bcel.internal.classfile.AttributeReader
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* @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
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*/
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public final class Unknown extends Attribute {
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private byte[] bytes;
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private String name;
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private static HashMap unknown_attributes = new HashMap();
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/** @return array of unknown attributes, but just one for each kind.
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*/
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static Unknown[] getUnknownAttributes() {
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Unknown[] unknowns = new Unknown[unknown_attributes.size()];
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Iterator entries = unknown_attributes.values().iterator();
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for(int i=0; entries.hasNext(); i++)
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unknowns[i] = (Unknown)entries.next();
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unknown_attributes.clear();
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return unknowns;
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}
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/**
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* Initialize from another object. Note that both objects use the same
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* references (shallow copy). Use clone() for a physical copy.
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*/
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public Unknown(Unknown c) {
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this(c.getNameIndex(), c.getLength(), c.getBytes(), c.getConstantPool());
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}
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/**
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* Create a non-standard attribute.
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*
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* @param name_index Index in constant pool
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* @param length Content length in bytes
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* @param bytes Attribute contents
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* @param constant_pool Array of constants
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*/
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public Unknown(int name_index, int length, byte[] bytes,
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ConstantPool constant_pool)
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{
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super(Constants.ATTR_UNKNOWN, name_index, length, constant_pool);
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this.bytes = bytes;
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name = ((ConstantUtf8)constant_pool.getConstant(name_index,
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Constants.CONSTANT_Utf8)).getBytes();
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unknown_attributes.put(name, this);
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}
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/**
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* Construct object from file stream.
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* @param name_index Index in constant pool
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* @param length Content length in bytes
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* @param file Input stream
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* @param constant_pool Array of constants
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* @throws IOException
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*/
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Unknown(int name_index, int length, DataInputStream file,
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ConstantPool constant_pool)
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throws IOException
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{
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this(name_index, length, (byte [])null, constant_pool);
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if(length > 0) {
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bytes = new byte[length];
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file.readFully(bytes);
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}
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}
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/**
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* Called by objects that are traversing the nodes of the tree implicitely
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* defined by the contents of a Java class. I.e., the hierarchy of methods,
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* fields, attributes, etc. spawns a tree of objects.
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*
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* @param v Visitor object
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*/
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public void accept(Visitor v) {
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v.visitUnknown(this);
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}
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/**
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* Dump unknown bytes to file stream.
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*
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* @param file Output file stream
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* @throws IOException
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*/
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public final void dump(DataOutputStream file) throws IOException
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{
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super.dump(file);
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if(length > 0)
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file.write(bytes, 0, length);
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}
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/**
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* @return data bytes.
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*/
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public final byte[] getBytes() { return bytes; }
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/**
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* @return name of attribute.
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*/
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public final String getName() { return name; }
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/**
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* @param bytes.
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*/
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public final void setBytes(byte[] bytes) {
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this.bytes = bytes;
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}
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/**
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* @return String representation.
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*/
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public final String toString() {
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if(length == 0 || bytes == null)
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return "(Unknown attribute " + name + ")";
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String hex;
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if(length > 10) {
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byte[] tmp = new byte[10];
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System.arraycopy(bytes, 0, tmp, 0, 10);
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hex = Utility.toHexString(tmp) + "... (truncated)";
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}
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else
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hex = Utility.toHexString(bytes);
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return "(Unknown attribute " + name + ": " + hex + ")";
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}
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/**
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* @return deep copy of this attribute
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*/
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public Attribute copy(ConstantPool constant_pool) {
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Unknown c = (Unknown)clone();
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if(bytes != null)
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c.bytes = (byte[])bytes.clone();
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c.constant_pool = constant_pool;
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return c;
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}
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}
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