Package org.spockframework.runtime.extension.builtin

Source Code of org.spockframework.runtime.extension.builtin.ConfineMetaClassChangesInterceptor

/*
* Copyright 2010 the original author or authors.
*
* 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 org.spockframework.runtime.extension.builtin;

import groovy.lang.ExpandoMetaClass;
import groovy.lang.GroovySystem;
import groovy.lang.MetaClass;
import groovy.lang.MetaClassRegistry;

import org.spockframework.runtime.extension.IMethodInterceptor;
import org.spockframework.runtime.extension.IMethodInvocation;

import java.util.*;

/**
* @author Luke Daley
* @author Peter Niederwieser
*/
public class ConfineMetaClassChangesInterceptor implements IMethodInterceptor {
  private final Collection<Class<?>> classes;
  private final List<MetaClass> originalMetaClasses = new ArrayList<MetaClass>();

  public ConfineMetaClassChangesInterceptor(Collection<Class<?>> classes) {
    this.classes = classes;
  }

  public void intercept(IMethodInvocation invocation) throws Throwable {
    MetaClassRegistry registry = GroovySystem.getMetaClassRegistry();

    for (Class<?> clazz : classes) {
      originalMetaClasses.add(registry.getMetaClass(clazz));
      MetaClass temporaryMetaClass = new ExpandoMetaClass(clazz, true, true);
      temporaryMetaClass.initialize();
      registry.setMetaClass(clazz, temporaryMetaClass);
    }

    try {
      invocation.proceed();
    } finally {
      for (MetaClass original : originalMetaClasses)
        registry.setMetaClass(original.getTheClass(), original);
    }
  }
}
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