package org.aspectj.apache.bcel.classfile;
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" and
* "Apache BCEL" must not be used to endorse or promote products
* derived from this software without prior written permission. For
* written permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* "Apache BCEL", nor may "Apache" appear in their name, without
* prior written permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import org.aspectj.apache.bcel.Constants;
This class represents a reference to an unknown (i.e., application-specific) attribute of a class. It is instantiated from the
Attribute.readAttribute() method. Applications that need to read in application-specific attributes should create an AttributeReader implementation and attach it via Attribute.addAttributeReader.
Author: M. Dahm See Also: Version: $Id: Unknown.java,v 1.6 2009/09/15 19:40:12 aclement Exp $
/**
* 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,
* org.aspectj.apache.bcel.classfile.AttributeReader)">Attribute.addAttributeReader</a>.
*
*
* @version $Id: Unknown.java,v 1.6 2009/09/15 19:40:12 aclement Exp $
* @see org.aspectj.apache.bcel.classfile.Attribute
* @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
*/
public final class Unknown extends Attribute {
private byte[] bytes;
private String name;
// evil static - removed by Andy C - no apparent users (4 Mar 06)
// 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.
/**
* 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.
Params: - name_index – Index in constant pool
- length – Content length in bytes
- bytes – Attribute contents
- constant_pool – Array of constants
/**
* 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)).getValue();
// unknown_attributes.put(name, this);
}
Construct object from file stream.
Params: - name_index – Index in constant pool
- length – Content length in bytes
- file – Input stream
- constant_pool – Array of constants
Throws:
/**
* 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.
Params: - v – Visitor object
/**
* 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
*/
@Override
public void accept(ClassVisitor v) {
v.visitUnknown(this);
}
Dump unknown bytes to file stream.
Params: - file – Output file stream
Throws:
/**
* Dump unknown bytes to file stream.
*
* @param file Output file stream
* @throws IOException
*/
@Override
public final void dump(DataOutputStream file) throws IOException {
super.dump(file);
if (length > 0)
file.write(bytes, 0, length);
}
Returns: data bytes.
/**
* @return data bytes.
*/
public final byte[] getBytes() {
return bytes;
}
Returns: name of attribute.
/**
* @return name of attribute.
*/
@Override
public String getName() {
return name;
}
@param bytes.
/**
* @param bytes.
*/
public final void setBytes(byte[] bytes) {
this.bytes = bytes;
}
Returns: String representation.
/**
* @return String representation.
*/
@Override
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
*/
// @Override
// public Attribute copy(ConstantPool constant_pool) {
// Unknown c = (Unknown) clone();
//
// if (bytes != null)
// c.bytes = bytes.clone();
//
// c.cpool = constant_pool;
// return c;
// }
}