com.yworks.yguard.obf.classfile.LocalVariableTableAttrInfo Maven / Gradle / Ivy

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/**
 * YGuard -- an obfuscation library for Java(TM) classfiles.
 *
 * Original Copyright (c) 1999 Mark Welsh ([email protected])
 * Modifications Copyright (c) 2002 yWorks GmbH ([email protected])
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * The author may be contacted at [email protected] 
 *
 * Java and all Java-based marks are trademarks or registered 
 * trademarks of Sun Microsystems, Inc. in the U.S. and other countries.
 */
package com.yworks.yguard.obf.classfile;

import java.io.*;
import java.util.*;

/**
 * Representation of an attribute.
 *
 * @author      Mark Welsh
 */
public class LocalVariableTableAttrInfo extends AttrInfo
{
    // Constants -------------------------------------------------------------


    // Fields ----------------------------------------------------------------
    private int u2localVariableTableLength;
    private LocalVariableInfo[] localVariableTable;


    // Class Methods ---------------------------------------------------------


    // Instance Methods ------------------------------------------------------
    protected LocalVariableTableAttrInfo(ClassFile cf, int attrNameIndex, int attrLength)
    {
        super(cf, attrNameIndex, attrLength);
    }

    /** Return the String name of the attribute; over-ride this in sub-classes. */
    protected String getAttrName() 
    {
        return ATTR_LocalVariableTable;
    }

    /** Return the array of local variable table entries. */
    protected LocalVariableInfo[] getLocalVariableTable() 
    {
        return localVariableTable;
    }

    public void setLocalVariableTable(LocalVariableInfo[] lvts) {
      this.localVariableTable = lvts;
      this.u2localVariableTableLength = lvts.length;
      this.u4attrLength = 2 + 10 * u2localVariableTableLength;
    }

    /** Check for Utf8 references in the 'info' data to the constant pool and mark them. */
    protected void markUtf8RefsInInfo(ConstantPool pool) 
    {
        for (int i = 0; i < localVariableTable.length; i++)
        {
            localVariableTable[i].markUtf8Refs(pool);
        }
    }

    /** Read the data following the header. */
    protected void readInfo(DataInput din) throws java.io.IOException
    {
        u2localVariableTableLength = din.readUnsignedShort();
        localVariableTable = new LocalVariableInfo[u2localVariableTableLength];
        for (int i = 0; i < u2localVariableTableLength; i++)
        {
            localVariableTable[i] = LocalVariableInfo.create(din);
        }
    }

    /** Export data following the header to a DataOutput stream. */
    public void writeInfo(DataOutput dout) throws java.io.IOException
    {
        dout.writeShort(u2localVariableTableLength);
        for (int i = 0; i < u2localVariableTableLength; i++)
        {
            localVariableTable[i].write(dout);
        }
    }

}