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Groovy example source code file (StaticMetaClassSite.java)

This example Groovy source code file (StaticMetaClassSite.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

classinfo, groovyruntimeexception, groovyruntimeexception, metaclass, metaclasssite, object, object, staticmetaclasssite, staticmetaclasssite, throwable, throwable

The Groovy StaticMetaClassSite.java source code

/*
 * 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);
        }
    }
}

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