org.rapidpm.proxybuilder.objectadapter.annotations.dynamicobjectadapter.ExtendedInvocationHandler Maven / Gradle / Ivy

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Dynamic Dependency Injection with different ways to manage the resolver-strategy

There is a newer version: 01.02.00-RPM

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.rapidpm.proxybuilder.objectadapter.annotations.dynamicobjectadapter;


import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;

public abstract class ExtendedInvocationHandler implements InvocationHandler {

  private final Map adaptedMethods = new HashMap<>();
  private final Map adapters = new HashMap<>();
  private T original;

  public void setOriginal(T original) {
    this.original = original;
  }

  public void addAdapter(Object adapter) {
    final Class adapterClass = adapter.getClass();
    Method[] methods = adapterClass.getDeclaredMethods();
    for (Method m : methods) {
      final MethodIdentifier key = new MethodIdentifier(m);
      adaptedMethods.put(key, m);
      adapters.put(key, adapter);
    }
  }

  @Override
  public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
    try {
      final MethodIdentifier key = new MethodIdentifier(method);
      Method other = adaptedMethods.get(key);
      if (other != null) {
        other.setAccessible(true); //Lambdas...
        final Object result = other.invoke(adapters.get(key), args);
        other.setAccessible(false);
        return result;
      } else {
        return method.invoke(original, args);
      }
    } catch (InvocationTargetException e) {
      throw e.getTargetException();
    }
  }

}