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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.attribute.visitor;

import proguard.classfile.*;
import proguard.classfile.attribute.*;

/**
 * This {@link LineNumberInfoVisitor} remembers the lowest and the highest line numbers that it
 * finds in all the line numbers that it visits. It ignores the sources of the line numbers.
 */
public class LineNumberRangeFinder implements LineNumberInfoVisitor {
  private int lowestLineNumber = Integer.MAX_VALUE;
  private int highestLineNumber = 0;
  private boolean hasSource;

  /** Returns the lowest line number that has been visited so far. */
  public int getLowestLineNumber() {
    return lowestLineNumber;
  }

  /** Returns the highest line number that has been visited so far. */
  public int getHighestLineNumber() {
    return highestLineNumber;
  }

  /** Returns whether any of the visited line numbers has a non-null source. */
  public boolean hasSource() {
    return hasSource;
  }

  // Implementations for LineNumberInfoVisitor.

  public void visitLineNumberInfo(
      Clazz clazz, Method method, CodeAttribute codeAttribute, LineNumberInfo lineNumberInfo) {
    int lineNumber = lineNumberInfo.u2lineNumber;

    // Remember the lowest line number.
    if (lowestLineNumber > lineNumber) {
      lowestLineNumber = lineNumber;
    }

    // Remember the highest line number.
    if (highestLineNumber < lineNumber) {
      highestLineNumber = lineNumber;
    }

    if (lineNumberInfo.getSource() != null) {
      hasSource = true;
    }
  }
}