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/*
* 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 org.apache.bcel.classfile;
import java.io.DataInput;
import java.io.DataOutputStream;
import java.io.IOException;
import org.apache.bcel.Const;
/**
* This class is derived from <em>Attribute</em> and declares this class as
* `synthetic', i.e., it needs special handling. The JVM specification
* states "A class member that does not appear in the source code must be
* marked using a Synthetic attribute." It may appear in the ClassFile
* attribute table, a field_info table or a method_info table. This class
* is intended to be instantiated from the
* <em>Attribute.readAttribute()</em> method.
*
* @version $Id$
* @see Attribute
*/
public final class Synthetic extends Attribute {
private byte[] bytes;
/**
* Initialize from another object. Note that both objects use the same
* references (shallow copy). Use copy() for a physical copy.
*/
public Synthetic(final Synthetic c) {
this(c.getNameIndex(), c.getLength(), c.getBytes(), c.getConstantPool());
}
/**
* @param name_index Index in constant pool to CONSTANT_Utf8, which
* should represent the string "Synthetic".
* @param length Content length in bytes - should be zero.
* @param bytes Attribute contents
* @param constant_pool The constant pool this attribute is associated
* with.
*/
public Synthetic(final int name_index, final int length, final byte[] bytes, final ConstantPool constant_pool) {
super(Const.ATTR_SYNTHETIC, name_index, length, constant_pool);
this.bytes = bytes;
}
/**
* Construct object from input stream.
*
* @param name_index Index in constant pool to CONSTANT_Utf8
* @param length Content length in bytes
* @param input Input stream
* @param constant_pool Array of constants
* @throws IOException
*/
Synthetic(final int name_index, final int length, final DataInput input, final ConstantPool constant_pool)
throws IOException {
this(name_index, length, (byte[]) null, constant_pool);
if (length > 0) {
bytes = new byte[length];
input.readFully(bytes);
System.err.println("Synthetic attribute with length > 0");
}
}
/**
* 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( final Visitor v ) {
v.visitSynthetic(this);
}
/**
* Dump source file attribute to file stream in binary format.
*
* @param file Output file stream
* @throws IOException
*/
@Override
public final void dump( final DataOutputStream file ) throws IOException {
super.dump(file);
if (super.getLength() > 0) {
file.write(bytes, 0, super.getLength());
}
}
/**
* @return data bytes.
*/
public final byte[] getBytes() {
return bytes;
}
/**
* @param bytes
*/
public final void setBytes( final byte[] bytes ) {
this.bytes = bytes;
}
/**
* @return String representation.
*/
@Override
public final String toString() {
final StringBuilder buf = new StringBuilder("Synthetic");
if (super.getLength() > 0) {
buf.append(" ").append(Utility.toHexString(bytes));
}
return buf.toString();
}
/**
* @return deep copy of this attribute
*/
@Override
public Attribute copy( final ConstantPool _constant_pool ) {
final Synthetic c = (Synthetic) clone();
if (bytes != null) {
c.bytes = new byte[bytes.length];
System.arraycopy(bytes, 0, c.bytes, 0, bytes.length);
}
c.setConstantPool(_constant_pool);
return c;
}
}
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