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Groovy example source code file (PojoMetaMethodSite.java)

This example Groovy source code file (PojoMetaMethodSite.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

class, class, groovyruntimeexception, metaclassimpl, metaclassimpl, metamethod, nullpointerexception, object, object, pojocachedmethodsite, pojocachedmethodsitenounwrap, pojometamethodsite, reflection, throwable, throwable

The Groovy PojoMetaMethodSite.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.reflection.CachedMethod;
import org.codehaus.groovy.runtime.GroovyCategorySupport;
import org.codehaus.groovy.runtime.MetaClassHelper;
import org.codehaus.groovy.runtime.NullObject;
import org.codehaus.groovy.runtime.ScriptBytecodeAdapter;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * POJO call site
 *   meta class - cached
 *   method - cached
 *
 * @author Alex Tkachman
*/
public class PojoMetaMethodSite extends MetaMethodSite {

    protected final int version;

    public PojoMetaMethodSite(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);
        return metaMethod.doMethodInvoke(receiver,  args);
    }

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

    protected final boolean checkPojoMetaClass() {
        return !GroovyCategorySupport.hasCategoryInCurrentThread()
            && ((MetaClassImpl)metaClass).getVersion() == version;
    }

    protected final boolean checkCall(Object receiver, Object[] args) {
        try {
            return receiver.getClass() == metaClass.getTheClass() // meta class match receiver
               && checkPojoMetaClass()
               && MetaClassHelper.sameClasses(params, args);
        }
        catch (NullPointerException e) {
            if (receiver == null)
              return checkCall(NullObject.getNullObject(), args);

            throw e;
        }
    }

    protected final boolean checkCall(Object receiver) {
        try {
            return receiver.getClass() == metaClass.getTheClass() // meta class match receiver
               && checkPojoMetaClass()
               && MetaClassHelper.sameClasses(params);
        } catch (NullPointerException e) {
            if (receiver == null)
              return checkCall(NullObject.getNullObject());

            throw e;
        }
    }

    protected final boolean checkCall(Object receiver, Object arg1) {
        try {
            return receiver.getClass() == metaClass.getTheClass() // meta class match receiver
               && checkPojoMetaClass()
               && MetaClassHelper.sameClasses(params, arg1);
        } catch (NullPointerException e) {
            if (receiver == null)
              return checkCall(NullObject.getNullObject(), arg1);

            throw e;
        }
    }

    protected final boolean checkCall(Object receiver, Object arg1, Object arg2) {
        try {
            return receiver.getClass() == metaClass.getTheClass() // meta class match receiver
               && checkPojoMetaClass()
               && MetaClassHelper.sameClasses(params, arg1, arg2);
        } catch (NullPointerException e) {
            if (receiver == null)
              return checkCall(NullObject.getNullObject(), arg1, arg2);

            throw e;
        }
    }

    protected final boolean checkCall(Object receiver, Object arg1, Object arg2, Object arg3) {
        try {
            return receiver.getClass() == metaClass.getTheClass() // meta class match receiver
               && checkPojoMetaClass()
               && MetaClassHelper.sameClasses(params, arg1, arg2, arg3);
        } catch (NullPointerException e) {
            if (receiver == null)
              return checkCall(NullObject.getNullObject(), arg1, arg2, arg3);

            throw e;
        }
    }

    protected final boolean checkCall(Object receiver, Object arg1, Object arg2, Object arg3, Object arg4) {
        try {
            return receiver.getClass() == metaClass.getTheClass() // meta class match receiver
               && checkPojoMetaClass()
               && MetaClassHelper.sameClasses(params, arg1, arg2, arg3, arg4);
        } catch (NullPointerException e) {
            if (receiver == null)
              return checkCall(NullObject.getNullObject(), arg1, arg2, arg3, arg4);

            throw e;
        }
    }

    public static CallSite createPojoMetaMethodSite(CallSite site, MetaClassImpl metaClass, MetaMethod metaMethod, Class[] params, Object receiver, Object[] args) {
        if (metaMethod instanceof CallSiteAwareMetaMethod) {
            return ((CallSiteAwareMetaMethod)metaMethod).createPojoCallSite(site, metaClass, metaMethod, params, receiver, args);
        }

        if (metaMethod.getClass() == CachedMethod.class)
          return createCachedMethodSite (site, metaClass, (CachedMethod) metaMethod, params, args);

        return createNonAwareCallSite(site, metaClass, metaMethod, params, args);
    }

    public static CallSite createCachedMethodSite(CallSite site, MetaClassImpl metaClass, CachedMethod metaMethod, Class[] params, Object[] args) {
        if (metaMethod.correctArguments(args) == args) {
            if (noWrappers(args)) {
                if (noCoerce(metaMethod,args))
                    return new PojoCachedMethodSiteNoUnwrap(site, metaClass, metaMethod, params);
                else
                    return metaMethod.createPojoMetaMethodSite(site, metaClass, params);
            }
        }
        return new PojoCachedMethodSite(site, metaClass, metaMethod, params);
    }

    public static CallSite createNonAwareCallSite(CallSite site, MetaClassImpl metaClass, MetaMethod metaMethod, Class[] params, Object[] args) {
        if (metaMethod.correctArguments(args) == args) {
            if (noWrappers(args)) {
                if (noCoerce(metaMethod,args))
                    return new PojoMetaMethodSiteNoUnwrap(site, metaClass, metaMethod, params);
                else
                    return new PojoMetaMethodSiteNoUnwrapNoCoerce(site, metaClass, metaMethod, params);
            }
        }
        return new PojoMetaMethodSite(site, metaClass, metaMethod, params);
    }

    public static class PojoCachedMethodSite extends PojoMetaMethodSite {
        final Method reflect;

        public PojoCachedMethodSite(CallSite site, MetaClassImpl metaClass, MetaMethod metaMethod, Class[] params) {
            super(site, metaClass, metaMethod, params);
            reflect = ((CachedMethod)metaMethod).setAccessible();
        }

        public Object invoke(Object receiver, Object[] args) throws Throwable {
            MetaClassHelper.unwrap(args);
            args = metaMethod.coerceArgumentsToClasses(args);
            try {
                return reflect.invoke(receiver, args);
            } catch (InvocationTargetException e) {
                Throwable cause = e.getCause();
                if (cause instanceof GroovyRuntimeException) {
                    throw ScriptBytecodeAdapter.unwrap ((GroovyRuntimeException) cause);
                } else {
                    throw cause;
                }
            }
        }
    }

    public static class PojoCachedMethodSiteNoUnwrap extends PojoCachedMethodSite {

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

        public final Object invoke(Object receiver, Object[] args) throws Throwable {
            args = metaMethod.coerceArgumentsToClasses(args);
            try {
                return reflect.invoke(receiver, args);
            } catch (InvocationTargetException e) {
                Throwable cause = e.getCause();
                if (cause instanceof GroovyRuntimeException) {
                    throw ScriptBytecodeAdapter.unwrap ((GroovyRuntimeException) cause);
                } else {
                    throw cause;
                }
            }
        }
    }

    public static class PojoCachedMethodSiteNoUnwrapNoCoerce extends PojoCachedMethodSite {

        public PojoCachedMethodSiteNoUnwrapNoCoerce(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 reflect.invoke(receiver, args);
            } catch (InvocationTargetException e) {
                Throwable cause = e.getCause();
                if (cause instanceof GroovyRuntimeException) {
                    throw ScriptBytecodeAdapter.unwrap ((GroovyRuntimeException) cause);
                } else {
                    throw cause;
                }
            }
        }
    }

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

        public PojoMetaMethodSiteNoUnwrap(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 PojoMetaMethodSiteNoUnwrapNoCoerce extends PojoMetaMethodSite {

        public PojoMetaMethodSiteNoUnwrapNoCoerce(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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