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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 [email protected].
*
* 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,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* 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
* .
*/
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import org.aspectj.apache.bcel.Constants;
/**
* This class represents collection of local variables in a method. This attribute is contained in the Code attribute.
*
* @version $Id: LocalVariableTable.java,v 1.8 2009/09/15 19:40:12 aclement Exp $
* @author M. Dahm
* @see Code
* @see LocalVariable Updates: Andy 14Feb06 - Made unpacking of the data lazy, depending on someone actually asking for it.
*/
public class LocalVariableTable extends Attribute {
// if 'isInPackedState' then this data needs unpacking
private boolean isInPackedState = false;
private byte[] data;
private int localVariableTableLength;
private LocalVariable[] localVariableTable;
/**
* Initialize from another object. Note that both objects use the same references (shallow copy). Use copy() for a physical
* copy.
*/
public LocalVariableTable(LocalVariableTable c) {
this(c.getNameIndex(), c.getLength(), c.getLocalVariableTable(), c.getConstantPool());
}
/**
* @param name_index Index in constant pool to `LocalVariableTable'
* @param length Content length in bytes
* @param local_variable_table Table of local variables
* @param constant_pool Array of constants
*/
public LocalVariableTable(int name_index, int length, LocalVariable[] local_variable_table, ConstantPool constant_pool) {
super(Constants.ATTR_LOCAL_VARIABLE_TABLE, name_index, length, constant_pool);
setLocalVariableTable(local_variable_table);
}
/**
* 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
*/
LocalVariableTable(int name_index, int length, DataInputStream file, ConstantPool constant_pool) throws IOException {
super(Constants.ATTR_LOCAL_VARIABLE_TABLE, name_index, length, constant_pool);
data = new byte[length];
file.readFully(data);
isInPackedState = true;
// assert(bytesRead==length)
}
/**
* 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) {
unpack();
v.visitLocalVariableTable(this);
}
/**
* Dump local variable table attribute to file stream in binary format.
*
* @param file Output file stream
* @throws IOException
*/
@Override
public final void dump(DataOutputStream file) throws IOException {
super.dump(file);
if (isInPackedState) {
file.write(data);
} else {
file.writeShort(localVariableTableLength);
for (int i = 0; i < localVariableTableLength; i++)
localVariableTable[i].dump(file);
}
}
/**
* @return Array of local variables of method.
*/
public final LocalVariable[] getLocalVariableTable() {
unpack();
return localVariableTable;
}
/**
* @return first matching variable using index
*/
public final LocalVariable getLocalVariable(int index) {
unpack();
for (int i = 0; i < localVariableTableLength; i++) {
if (localVariableTable[i] != null && localVariableTable[i].getIndex() == index) {
return localVariableTable[i];
}
}
return null;
}
public final void setLocalVariableTable(LocalVariable[] local_variable_table) {
data = null;
isInPackedState = false;
this.localVariableTable = local_variable_table;
localVariableTableLength = (local_variable_table == null) ? 0 : local_variable_table.length;
}
/**
* @return String representation.
*/
@Override
public final String toString() {
StringBuffer buf = new StringBuffer("");
unpack();
for (int i = 0; i < localVariableTableLength; i++) {
buf.append(localVariableTable[i].toString());
if (i < localVariableTableLength - 1)
buf.append('\n');
}
return buf.toString();
}
/**
* @return deep copy of this attribute
*/
// public Attribute copy(ConstantPool constant_pool) {
// unpack();
// LocalVariableTable c = (LocalVariableTable) clone();
//
// c.localVariableTable = new LocalVariable[localVariableTableLength];
// for (int i = 0; i < localVariableTableLength; i++)
// c.localVariableTable[i] = localVariableTable[i].copy();
//
// c.cpool = constant_pool;
// return c;
// }
public final int getTableLength() {
unpack();
return localVariableTableLength;
}
// ---
// Unpacks the byte array into the table
private void unpack() {
if (!isInPackedState)
return;
try {
ByteArrayInputStream bs = new ByteArrayInputStream(data);
DataInputStream dis = new DataInputStream(bs);
localVariableTableLength = (dis.readUnsignedShort());
localVariableTable = new LocalVariable[localVariableTableLength];
for (int i = 0; i < localVariableTableLength; i++)
localVariableTable[i] = new LocalVariable(dis, cpool);
dis.close();
data = null; // throw it away now
} catch (IOException e) {
throw new RuntimeException("Unpacking of LocalVariableTable attribute failed");
}
isInPackedState = false;
}
}
