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Groovy example source code file (StaticMetaMethodSite.java)

This example Groovy source code file (StaticMetaMethodSite.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

callsite, class, groovyruntimeexception, metaclassimpl, metaclassimpl, metamethod, object, object, staticmetamethodsite, staticmetamethodsite, staticmetamethodsitenounwrap, staticmetamethodsitenounwrapnocoerce, throwable, throwable

The Groovy StaticMetaMethodSite.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.GroovyRuntimeException;
import groovy.lang.MetaClassImpl;
import groovy.lang.MetaMethod;
import org.codehaus.groovy.runtime.MetaClassHelper;
import org.codehaus.groovy.runtime.ScriptBytecodeAdapter;
import org.codehaus.groovy.reflection.CachedMethod;

/**
 * POJO call site
 *   meta class - cached
 *   method - cached
 *
 * @author Alex Tkachman
*/
public class StaticMetaMethodSite extends MetaMethodSite {
    private final int version;

    public StaticMetaMethodSite(CallSite site, MetaClassImpl metaClass, MetaMethod metaMethod, Class params[]) {
        super(site, metaClass, metaMethod, params);
        version = metaClass.getVersion ();
    }

    public Object invoke(Object receiver, Object[] args) throws Throwable {
        MetaClassHelper.unwrap(args);
        try {
            return metaMethod.doMethodInvoke(receiver,  args);
        } catch (GroovyRuntimeException gre) {
            throw ScriptBytecodeAdapter.unwrap(gre);
        }
    }

    protected final boolean checkCall(Object receiver, Object[] args) {
        return receiver == metaClass.getTheClass() // meta class match receiver
           && ((MetaClassImpl)metaClass).getVersion() == version // metaClass still be valid
           && MetaClassHelper.sameClasses(params, args);
    }

    protected final boolean checkCall(Object receiver) {
        return receiver == metaClass.getTheClass() // meta class match receiver
           && ((MetaClassImpl)metaClass).getVersion() == version // metaClass still be valid
           && MetaClassHelper.sameClasses(params);
    }

    protected final boolean checkCall(Object receiver, Object arg1) {
        return receiver == metaClass.getTheClass() // meta class match receiver
           && ((MetaClassImpl)metaClass).getVersion() == version // metaClass still be valid
           && MetaClassHelper.sameClasses(params, arg1);
    }

    protected final boolean checkCall(Object receiver, Object arg1, Object arg2) {
        return receiver == metaClass.getTheClass() // meta class match receiver
           && ((MetaClassImpl)metaClass).getVersion() == version // metaClass still be valid
           && MetaClassHelper.sameClasses(params, arg1, arg2);
    }

    protected final boolean checkCall(Object receiver, Object arg1, Object arg2, Object arg3) {
        return receiver == metaClass.getTheClass() // meta class match receiver
           && ((MetaClassImpl)metaClass).getVersion() == version // metaClass still be valid
           && MetaClassHelper.sameClasses(params, arg1, arg2, arg3);
    }

    protected final boolean checkCall(Object receiver, Object arg1, Object arg2, Object arg3, Object arg4) {
        return receiver == metaClass.getTheClass() // meta class match receiver
           && ((MetaClassImpl)metaClass).getVersion() == version // metaClass still be valid
           && MetaClassHelper.sameClasses(params, arg1, arg2, arg3, arg4);
    }

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

    public Object callStatic(Class receiver, Object[] args) throws Throwable {
        if(checkCall(receiver, args))
          return invoke(receiver, args);
        else
          return CallSiteArray.defaultCallStatic(this, receiver, args);
    }

    public static CallSite createStaticMetaMethodSite(CallSite site, MetaClassImpl metaClass, MetaMethod metaMethod, Class[] params, Object[] args) {
        if (metaMethod.correctArguments(args) == args) {
            if (noWrappers(args)) {
                if (noCoerce(metaMethod,args))
                    return new StaticMetaMethodSiteNoUnwrap(site, metaClass, metaMethod, params);
                else
                    if (metaMethod.getClass() == CachedMethod.class)
                      return ((CachedMethod)metaMethod).createStaticMetaMethodSite(site, metaClass, params);
                    else
                      return new StaticMetaMethodSiteNoUnwrapNoCoerce (site, metaClass, metaMethod, params);
            }
        }
        return new StaticMetaMethodSite(site, metaClass, metaMethod, params);
    }

    /**
     * Call site where we know there is no need to unwrap arguments
     */
    public static class StaticMetaMethodSiteNoUnwrap extends StaticMetaMethodSite {

        public StaticMetaMethodSiteNoUnwrap(CallSite site, MetaClassImpl metaClass, MetaMethod metaMethod, Class params[]) {
            super(site, metaClass, metaMethod, params);
        }

        public final Object invoke(Object receiver, Object[] args) throws Throwable {
            try {
                return metaMethod.doMethodInvoke(receiver,  args);
            } catch (GroovyRuntimeException gre) {
                throw ScriptBytecodeAdapter.unwrap(gre);
            }
        }
    }

    /**
     * Call site where we know there is no need neither unwrap nor coerce arguments
     */
    public static class StaticMetaMethodSiteNoUnwrapNoCoerce extends StaticMetaMethodSite {

        public StaticMetaMethodSiteNoUnwrapNoCoerce(CallSite site, MetaClassImpl metaClass, MetaMethod metaMethod, Class params[]) {
            super(site, metaClass, metaMethod, params);
        }

        public final Object invoke(Object receiver, Object[] args) throws Throwable {
            try {
                return metaMethod.invoke(receiver,  args);
            } catch (GroovyRuntimeException gre) {
                throw ScriptBytecodeAdapter.unwrap(gre);
            }
        }
    }
}

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