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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.util;

/** This class provides a straightforward implementation of the Processable interface. */
public class SimpleProcessable implements Processable {
  private static final boolean CHECK_OVERRIDE =
      System.getProperty("proguard.processinginfo.check_overriding") != null;

  public int processingFlags;
  public Object processingInfo;

  /** Creates an uninitialized SimpleProcessable. */
  public SimpleProcessable() {}

  /** Creates an initialized SimpleProcessable. */
  public SimpleProcessable(int processingFlags, Object processingInfo) {
    this.processingFlags = processingFlags;
    this.processingInfo = processingInfo;
  }

  // Implementations for Processable.

  @Override
  public int getProcessingFlags() {
    return processingFlags;
  }

  @Override
  public void setProcessingFlags(int processingFlags) {
    this.processingFlags = processingFlags;
  }

  /** Adds all given flags to this processable. */
  public void addProcessingFlags(int... flags) {
    for (int flag : flags) {
      processingFlags = processingFlags | flag;
    }
  }

  /** Removes all given flags from this processable. */
  public void removeProcessingFlags(int... flags) {
    for (int flag : flags) {
      processingFlags = processingFlags & ~flag;
    }
  }

  /** Checks whether all the given flags are set on this processable. */
  public boolean hasProcessingFlags(int... flags) {
    int allFlags = 0;
    for (int flag : flags) {
      allFlags = allFlags | flag;
    }
    return (~processingFlags & allFlags) == 0;
  }

  @Override
  public Object getProcessingInfo() {
    return processingInfo;
  }

  @Override
  public void setProcessingInfo(Object processingInfo) {
    if (CHECK_OVERRIDE) {
      if (this.processingInfo != null
          && processingInfo != null
          && !this.processingInfo
              .getClass()
              .getName()
              .equals(processingInfo.getClass().getName())) {
        // Get the second (top-down) element of the stack trace (the setProcessingInfo call).
        StackTraceElement[] stackTrace = Thread.currentThread().getStackTrace();
        StackTraceElement stackTraceElement = stackTrace.length > 2 ? stackTrace[2] : null;

        System.out.printf(
            "Overriding processingInfo. Old:%s, New:%s. Stacktrace entry before last is:\n\t%s%n",
            this.processingInfo.getClass().getName(),
            processingInfo.getClass().getName(),
            stackTraceElement);
      }
    }
    this.processingInfo = processingInfo;
  }
}