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ProGuardCORE is a free library to read, analyze, modify, and write Java class files.

There is a newer version: 9.1.6

/*
 * ProGuardCORE -- library to process Java bytecode.
 *
 * Copyright (c) 2002-2020 Guardsquare NV
 *
 * Licensed 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 proguard.classfile.editor;

import proguard.classfile.attribute.*;
import proguard.util.ArrayUtil;

/**
 * This class can add local variables to a given local variable table attribute. Local variables to
 * be added must have been filled out beforehand.
 *
 * @author Eric Lafortune
 */
public class LocalVariableTableAttributeEditor {
  private final LocalVariableTableAttribute targetLocalVariableTableAttribute;

  /**
   * Creates a new LocalVariableTableAttributeEditor that will edit local variables in the given
   * local variable table attribute.
   */
  public LocalVariableTableAttributeEditor(
      LocalVariableTableAttribute targetLocalVariableTableAttribute) {
    this.targetLocalVariableTableAttribute = targetLocalVariableTableAttribute;
  }

  /** Adds a given line number to the line number table attribute. */
  public void addLocalVariableInfo(LocalVariableInfo localVariableInfo) {
    targetLocalVariableTableAttribute.localVariableTable =
        ArrayUtil.add(
            targetLocalVariableTableAttribute.localVariableTable,
            targetLocalVariableTableAttribute.u2localVariableTableLength++,
            localVariableInfo);
  }
}