Java example source code file (LocalVariableTypeTable.java)

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Java - Java tags/keywords

attribute, constantpool, datainputstream, ioexception, localvariable, localvariabletypetable, override, stringbuilder

The LocalVariableTypeTable.java Java example source code

/*
 * reserved comment block
 * DO NOT REMOVE OR ALTER!
 */
package com.sun.org.apache.bcel.internal.classfile;
/**
 *  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.
 */

import  com.sun.org.apache.bcel.internal.Constants;
import  java.io.*;

// The new table is used when generic types are about...

//LocalVariableTable_attribute {
//         u2 attribute_name_index;
//         u4 attribute_length;
//         u2 local_variable_table_length;
//         {  u2 start_pc;
//            u2 length;
//            u2 name_index;
//            u2 descriptor_index;
//            u2 index;
//         } local_variable_table[local_variable_table_length];
//       }

//LocalVariableTypeTable_attribute {
//    u2 attribute_name_index;
//    u4 attribute_length;
//    u2 local_variable_type_table_length;
//    {
//      u2 start_pc;
//      u2 length;
//      u2 name_index;
//      u2 signature_index;
//      u2 index;
//    } local_variable_type_table[local_variable_type_table_length];
//  }
// J5TODO: Needs some testing !
public class LocalVariableTypeTable extends Attribute {
  private static final long serialVersionUID = -1082157891095177114L;
private int             local_variable_type_table_length; // Table of local
  private LocalVariable[] local_variable_type_table;        // variables

  public LocalVariableTypeTable(LocalVariableTypeTable c) {
    this(c.getNameIndex(), c.getLength(), c.getLocalVariableTypeTable(),
         c.getConstantPool());
  }

  public LocalVariableTypeTable(int name_index, int length,
                            LocalVariable[] local_variable_table,
                            ConstantPool    constant_pool)
  {
    super(Constants.ATTR_LOCAL_VARIABLE_TYPE_TABLE, name_index, length, constant_pool);
    setLocalVariableTable(local_variable_table);
  }

  LocalVariableTypeTable(int nameIdx, int len, DataInputStream dis,ConstantPool cpool) throws IOException {
    this(nameIdx, len, (LocalVariable[])null, cpool);

    local_variable_type_table_length = (dis.readUnsignedShort());
    local_variable_type_table = new LocalVariable[local_variable_type_table_length];

    for(int i=0; i < local_variable_type_table_length; i++)
      local_variable_type_table[i] = new LocalVariable(dis, cpool);
  }

  @Override
public void accept(Visitor v) {
    v.visitLocalVariableTypeTable(this);
  }

  @Override
public final void dump(DataOutputStream file) throws IOException
  {
    super.dump(file);
    file.writeShort(local_variable_type_table_length);
    for(int i=0; i < local_variable_type_table_length; i++)
      local_variable_type_table[i].dump(file);
  }

  public final LocalVariable[] getLocalVariableTypeTable() {
    return local_variable_type_table;
  }

  public final LocalVariable getLocalVariable(int index) {
    for(int i=0; i < local_variable_type_table_length; i++)
      if(local_variable_type_table[i].getIndex() == index)
        return local_variable_type_table[i];

    return null;
  }

  public final void setLocalVariableTable(LocalVariable[] local_variable_table)
  {
    this.local_variable_type_table = local_variable_table;
    local_variable_type_table_length = (local_variable_table == null)? 0 :
      local_variable_table.length;
  }

  /**
   * @return String representation.
   */
  @Override
public final String toString() {
      StringBuilder buf = new StringBuilder();

    for(int i=0; i < local_variable_type_table_length; i++) {
      buf.append(local_variable_type_table[i].toString());

      if(i < local_variable_type_table_length - 1) buf.append('\n');
    }

    return buf.toString();
  }

  /**
   * @return deep copy of this attribute
   */
  @Override
public Attribute copy(ConstantPool constant_pool) {
    LocalVariableTypeTable c = (LocalVariableTypeTable)clone();

    c.local_variable_type_table = new LocalVariable[local_variable_type_table_length];
    for(int i=0; i < local_variable_type_table_length; i++)
      c.local_variable_type_table[i] = local_variable_type_table[i].copy();

    c.constant_pool = constant_pool;
    return c;
  }

  public final int getTableLength() { return local_variable_type_table_length; }
}