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Groovy example source code file (PogoMetaClassSite.java)

This example Groovy source code file (PogoMetaClassSite.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

groovyobject, groovyruntimeexception, metaclass, metaclasssite, missingmethodexception, missingmethodexception, missingmethodexecutionfailed, missingmethodexecutionfailed, object, object, pogometaclasssite, pogometaclasssite, throwable

The Groovy PogoMetaClassSite.java source code

/*
 * Copyright 2003-2007 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.GroovyObject;
import groovy.lang.GroovyRuntimeException;
import groovy.lang.MetaClass;
import groovy.lang.MissingMethodException;

import org.codehaus.groovy.runtime.ScriptBytecodeAdapter;
import org.codehaus.groovy.runtime.metaclass.MissingMethodExecutionFailed;

/**
 *
 * @author Alex Tkachman
 */
public class PogoMetaClassSite extends MetaClassSite {
    public PogoMetaClassSite(CallSite site, MetaClass metaClass) {
        super(site, metaClass);
    }

    public final Object call(Object receiver, Object[] args) throws Throwable {
        if (checkCall(receiver)) {
            try {
                try {
                    return metaClass.invokeMethod(receiver, name, args);
                } catch (MissingMethodException e) {
                    if (e instanceof MissingMethodExecutionFailed) {
                        throw (MissingMethodException)e.getCause();
                    } else if (receiver.getClass() == e.getType() && e.getMethod().equals(name)) {
                        // in case there's nothing else, invoke the object's own invokeMethod()
                        return ((GroovyObject)receiver).invokeMethod(name, args);
                    } else {
                        throw e;
                    }
                }
            } catch (GroovyRuntimeException gre) {
                throw ScriptBytecodeAdapter.unwrap(gre);
            }
        } else {
          return CallSiteArray.defaultCall(this, receiver, args);
        }
    }

    protected final boolean checkCall(Object receiver) {
        return receiver instanceof GroovyObject && ((GroovyObject)receiver).getMetaClass() == metaClass;
    }

    public final Object callCurrent(GroovyObject receiver, Object[] args) throws Throwable {
        if (checkCall(receiver)) {
            try {
                try {
                    return metaClass.invokeMethod(receiver, name, args);
                } catch (MissingMethodException e) {
                    if (e instanceof MissingMethodExecutionFailed) {
                        throw (MissingMethodException)e.getCause();
                    } else if (receiver.getClass() == e.getType() && e.getMethod().equals(name)) {
                        // in case there's nothing else, invoke the object's own invokeMethod()
                        return ((GroovyObject)receiver).invokeMethod(name, args);
                    } else {
                        throw e;
                    }
                }
            } catch (GroovyRuntimeException gre) {
                throw ScriptBytecodeAdapter.unwrap(gre);
            }
        } else {
          return CallSiteArray.defaultCallCurrent(this, receiver, args);
        }
    }
}

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