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/*
 * Copyright 2003-2010 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.codehaus.groovy.runtime.callsite;

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

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

/**
 * Call site for invoking static methods
 *   meta class  - cached
 *   method - not cached
 *
 * @author Alex Tkachman
 */
public class StaticMetaClassSite extends MetaClassSite {

    private final ClassInfo classInfo;
    private final int version;

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

    private boolean checkCall(Object receiver) {
        return receiver == metaClass.getTheClass()
            && version == classInfo.getVersion(); // metaClass still be valid
    }

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

    public final Object callStatic(Class receiver, Object[] args) throws Throwable {
        if (checkCall(receiver)) {
            try {
                return metaClass.invokeStaticMethod(receiver, name, args);
            } catch (GroovyRuntimeException gre) {
                throw ScriptBytecodeAdapter.unwrap(gre);
            }
        } else {
            return CallSiteArray.defaultCallStatic(this, receiver, args);
        }
    }
}