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Groovy: A powerful, dynamic language for the JVM

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/*
 *  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.codehaus.groovy.runtime.callsite;

import groovy.lang.GroovyRuntimeException;
import groovy.lang.MetaClass;

import org.codehaus.groovy.reflection.ClassInfo;
import org.codehaus.groovy.runtime.ScriptBytecodeAdapter;

/**
 * POJO call site
 *   meta class - cached
 *   method - not cached
 *
 * @author Alex Tkachman
*/
public class PojoMetaClassSite extends MetaClassSite{
    private final ClassInfo classInfo;
    private final int version;

    public PojoMetaClassSite(CallSite site, MetaClass metaClass) {
        super(site, metaClass);
        classInfo = ClassInfo.getClassInfo(metaClass.getTheClass());
        version = classInfo.getVersion();
    }

    public Object call(Object receiver, Object[] args) throws Throwable {
        if(checkCall(receiver)) {
          try{
              return metaClass.invokeMethod(receiver, name, args);
          } catch (GroovyRuntimeException gre) {
              throw ScriptBytecodeAdapter.unwrap(gre);
          }
        } else {
          return CallSiteArray.defaultCall(this, receiver, args);
        }
    }

    protected final boolean checkCall(Object receiver) {
        return  receiver!=null &&
                receiver.getClass() == metaClass.getTheClass() &&
                version == classInfo.getVersion(); // metaClass is still valid
    }
}