content: package act.util;
  
  /*-
   * #%L
   * ACT Framework
   * %%
   * Copyright (C) 2014 - 2017 ActFramework
   * %%
   * 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.
   * #L%
   */
  
  import act.Act;
  import act.asm.ClassVisitor;
  import act.asm.Opcodes;
  import act.plugin.Plugin;
  import org.osgl.$;
  import org.osgl.util.E;
  
  /**
   * Base class for all bytecode enhancer that using ASM lib
   */
  public abstract class AsmByteCodeEnhancer<T extends AsmByteCodeEnhancer> extends PredictableByteCodeVisitor
          implements Opcodes, Plugin, Cloneable {
      private $.Predicate<String> targetClassPredicate;
  
      protected abstract Class<T> subClass();
  
      protected AsmByteCodeEnhancer() {
          this.targetClassPredicate = new $.Predicate<String>() {
              @Override
              public boolean test(String s) {
                  return Act.appConfig().needEnhancement(s);
              }
          };
      }
  
      protected AsmByteCodeEnhancer($.Predicate<String> targetClassPredicate) {
          this.targetClassPredicate = targetClassPredicate;
      }
  
      protected AsmByteCodeEnhancer($.Predicate<String> targetClassPredicate, ClassVisitor cv) {
          super(cv);
          this.targetClassPredicate = targetClassPredicate;
      }
  
      public void predicate($.Predicate<String> predicate) {
          targetClassPredicate = predicate;
      }
  
      @Override
      public boolean isTargetClass(String className) {
          return (null == targetClassPredicate) || targetClassPredicate.test(className);
      }
  
      @Override
      public void register() {
          Act.enhancerManager().register(this);
      }
  
      protected void reset() {}
  
      public T clone() {
          try {
              T clone = (T) super.clone();
              clone.reset();
              return clone;
          } catch (CloneNotSupportedException e) {
              throw E.unexpected(e);
          }
      }
  }
  