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package soot;

/*-
 * #%L
 * Soot - a J*va Optimization Framework
 * %%
 * Copyright (C) 1997 - 1999 Patrick Lam
 * %%
 * This program 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 2.1 of the
 * License, or (at your option) any later version.
 * 
 * This program 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 General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */

import java.util.Collections;
import java.util.Map;

/**
 * An abstract class which acts on a Body. This class provides a harness and acts as an interface for classes that wish to
 * transform a Body. Subclasses provide the actual Body transformation implementation.
 */
public abstract class BodyTransformer extends Transformer {

  private static final Map enabledOnlyMap = Collections.singletonMap("enabled", "true");

  /**
   * Called by clients of the transformation. Acts as a generic interface for BodyTransformers. Calls internalTransform with
   * the optionsString properly set up. That is, the options in optionsString override those in the Scene.
   *
   * @param b
   *          the body on which to apply the transformation
   * @param phaseName
   *          phaseName for the transform. Used to retrieve options from the Scene.
   */
  public final void transform(Body b, String phaseName, Map options) {
    if (PhaseOptions.getBoolean(options, "enabled")) {
      internalTransform(b, phaseName, options);
    }
  }

  public final void transform(Body b, String phaseName) {
    internalTransform(b, phaseName, enabledOnlyMap);
  }

  public final void transform(Body b) {
    transform(b, "");
  }

  /**
   * This method is called to perform the transformation itself. It is declared abstract; subclasses must implement this
   * method by making it the entry point to their actual Body transformation.
   *
   * @param b
   *          the body on which to apply the transformation
   * @param phaseName
   *          the phasename for this transform; not typically used by implementations.
   * @param options
   *          the actual computed options; a combination of default options and Scene specified options.
   */
  protected abstract void internalTransform(Body b, String phaseName, Map options);

}




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