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Groovy example source code file (AbstractCallSite.java)

This example Groovy source code file (AbstractCallSite.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

abstractcallsite, cachedfield, callsite, callsite, class, groovyobject, metaclass, metaclassimpl, metaclassimpl, object, object, reflection, string, throwable, throwable

The Groovy AbstractCallSite.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.*;

import org.codehaus.groovy.reflection.CachedClass;
import org.codehaus.groovy.reflection.CachedField;
import org.codehaus.groovy.reflection.ParameterTypes;
import org.codehaus.groovy.runtime.ArrayUtil;
import org.codehaus.groovy.runtime.GroovyCategorySupport;
import org.codehaus.groovy.runtime.InvokerHelper;
import org.codehaus.groovy.runtime.wrappers.Wrapper;

import java.lang.reflect.Method;

/**
 * Base class for all call sites
 *
 * @author Alex Tkachman
 */
public class AbstractCallSite implements CallSite {
    protected final int index;
    protected final String name;
    protected final CallSiteArray array;

    public AbstractCallSite(CallSiteArray array, int index, String name) {
        this.name = name;
        this.index = index;
        this.array = array;
    }

    public AbstractCallSite(CallSite prev) {
        this.name = prev.getName();
        this.index = prev.getIndex();
        this.array = prev.getArray();
    }

    public int getIndex() {
        return index;
    }

    public CallSiteArray getArray() {
        return array;
    }

    public String getName() {
        return name;
    }

    public final Object callSafe(Object receiver, Object[] args) throws Throwable {
        if (receiver == null)
            return null;

        return call(receiver, args);
    }

    public final Object callSafe(Object receiver) throws Throwable {
        if (receiver == null)
            return null;

        return call(receiver);
    }

    public final Object callSafe(Object receiver, Object arg1) throws Throwable {
        if (receiver == null)
            return null;

        return call(receiver, arg1);
    }

    public final Object callSafe(Object receiver, Object arg1, Object arg2) throws Throwable {
        if (receiver == null)
            return null;

        return call(receiver, arg1, arg2);
    }

    public final Object callSafe(Object receiver, Object arg1, Object arg2, Object arg3) throws Throwable {
        if (receiver == null)
            return null;

        return call(receiver, arg1, arg2, arg3);
    }

    public Object callSafe(Object receiver, Object arg1, Object arg2, Object arg3, Object arg4) throws Throwable {
        if (receiver == null)
            return null;

        return call(receiver, arg1, arg2, arg3, arg4);
    }


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

    public Object call(Object receiver) throws Throwable {
        return call(receiver, CallSiteArray.NOPARAM);
    }

    public Object call(Object receiver, Object arg1) throws Throwable {
        return call(receiver, ArrayUtil.createArray(arg1));
    }

    public Object call(Object receiver, Object arg1, Object arg2) throws Throwable {
        return call(receiver, ArrayUtil.createArray(arg1, arg2));
    }

    public Object call(Object receiver, Object arg1, Object arg2, Object arg3) throws Throwable {
        return call(receiver, ArrayUtil.createArray(arg1, arg2, arg3));
    }

    public Object call(Object receiver, Object arg1, Object arg2, Object arg3, Object arg4) throws Throwable {
        return call(receiver, ArrayUtil.createArray(arg1, arg2, arg3, arg4));
    }


    public Object callCurrent(GroovyObject receiver, Object[] args) throws Throwable {
        return CallSiteArray.defaultCallCurrent(this, receiver, args);
    }

    public Object callCurrent(GroovyObject receiver) throws Throwable {
        return callCurrent(receiver, CallSiteArray.NOPARAM);
    }

    public Object callCurrent(GroovyObject receiver, Object arg1) throws Throwable {
        return callCurrent(receiver, ArrayUtil.createArray(arg1));
    }

    public Object callCurrent(GroovyObject receiver, Object arg1, Object arg2) throws Throwable {
        return callCurrent(receiver, ArrayUtil.createArray(arg1, arg2));
    }

    public Object callCurrent(GroovyObject receiver, Object arg1, Object arg2, Object arg3) throws Throwable {
        return callCurrent(receiver, ArrayUtil.createArray(arg1, arg2, arg3));
    }

    public Object callCurrent(GroovyObject receiver, Object arg1, Object arg2, Object arg3, Object arg4) throws Throwable {
        return callCurrent(receiver, ArrayUtil.createArray(arg1, arg2, arg3, arg4));
    }

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

    public Object callStatic(Class receiver) throws Throwable {
        return callStatic(receiver, CallSiteArray.NOPARAM);
    }

    public Object callStatic(Class receiver, Object arg1) throws Throwable {
        return callStatic(receiver, ArrayUtil.createArray(arg1));
    }

    public Object callStatic(Class receiver, Object arg1, Object arg2) throws Throwable {
        return callStatic(receiver, ArrayUtil.createArray(arg1, arg2));
    }

    public Object callStatic(Class receiver, Object arg1, Object arg2, Object arg3) throws Throwable {
        return callStatic(receiver, ArrayUtil.createArray(arg1, arg2, arg3));
    }

    public Object callStatic(Class receiver, Object arg1, Object arg2, Object arg3, Object arg4) throws Throwable {
        return callStatic(receiver, ArrayUtil.createArray(arg1, arg2, arg3, arg4));
    }


    public Object callConstructor(Object receiver, Object[] args) throws Throwable {
        return CallSiteArray.defaultCallConstructor(this, receiver, args);
    }

    public Object callConstructor(Object receiver) throws Throwable {
        return callConstructor(receiver, CallSiteArray.NOPARAM);
    }

    public Object callConstructor(Object receiver, Object arg1) throws Throwable {
        return callConstructor(receiver, ArrayUtil.createArray(arg1));
    }

    public Object callConstructor(Object receiver, Object arg1, Object arg2) throws Throwable {
        return callConstructor(receiver, ArrayUtil.createArray(arg1, arg2));
    }

    public Object callConstructor(Object receiver, Object arg1, Object arg2, Object arg3) throws Throwable {
        return callConstructor(receiver, ArrayUtil.createArray(arg1, arg2, arg3));
    }

    public Object callConstructor(Object receiver, Object arg1, Object arg2, Object arg3, Object arg4) throws Throwable {
        return callConstructor(receiver, ArrayUtil.createArray(arg1, arg2, arg3, arg4));
    }

    static boolean noCoerce(ParameterTypes metaMethod, Object[] args) {
        final CachedClass[] paramClasses = metaMethod.getParameterTypes();
        if (paramClasses.length != args.length)
            return false;

        for (int i = 0; i < paramClasses.length; i++) {
            CachedClass paramClass = paramClasses[i];
            if (args[i] != null && !paramClass.isDirectlyAssignable(args[i]))
                return true;
        }
        return false;
    }

    static boolean noWrappers(Object[] args) {
        for (int i = 0; i != args.length; ++i)
            if (args[i] instanceof Wrapper)
                return false;
        return true;
    }


    public Object callGetProperty(Object receiver) throws Throwable {
        return acceptGetProperty(receiver).getProperty(receiver);
    }

    public Object callGroovyObjectGetProperty(Object receiver) throws Throwable {
        return acceptGroovyObjectGetProperty(receiver).getProperty(receiver);
    }

    public CallSite acceptGetProperty(Object receiver) {
        return createGetPropertySite(receiver);
    }

    public CallSite acceptGroovyObjectGetProperty(Object receiver) {
        return createGroovyObjectGetPropertySite(receiver);
    }

    protected final CallSite createGetPropertySite(Object receiver) {
        if (receiver == null) {
            return new NullCallSite(this);
        } else if (receiver instanceof GroovyObject) {
            return createGroovyObjectGetPropertySite(receiver);
        } else if (receiver instanceof Class) {
            return createClassMetaClassGetPropertySite((Class) receiver);
        }
        return createPojoMetaClassGetPropertySite(receiver);
    }

    protected final CallSite createGroovyObjectGetPropertySite(Object receiver) {
        Class aClass = receiver.getClass();
        try {
            final Method method = aClass.getMethod("getProperty", String.class);
            if (method != null && method.isSynthetic() && ((GroovyObject) receiver).getMetaClass() instanceof MetaClassImpl)
                return createPogoMetaClassGetPropertySite((GroovyObject) receiver);
        } catch (NoSuchMethodException e) {
            // fall threw
        }
        if (receiver instanceof Class) {
            return createClassMetaClassGetPropertySite((Class) receiver);
        } else {
            return createPogoGetPropertySite(aClass);
        }
    }

    public Object getProperty(Object receiver) throws Throwable {
        throw new UnsupportedOperationException();
    }

    private CallSite createPojoMetaClassGetPropertySite(Object receiver) {
        final MetaClass metaClass = InvokerHelper.getMetaClass(receiver);

        CallSite site;
        if (metaClass.getClass() != MetaClassImpl.class || GroovyCategorySupport.hasCategoryInCurrentThread()) {
            site = new PojoMetaClassGetPropertySite(this);
        } else {
            final MetaProperty effective = ((MetaClassImpl) metaClass).getEffectiveGetMetaProperty(receiver.getClass(), receiver, name, false);
            if (effective != null) {
                if (effective instanceof CachedField)
                    site = new GetEffectivePojoFieldSite(this, (MetaClassImpl) metaClass, (CachedField) effective);
                else
                    site = new GetEffectivePojoPropertySite(this, (MetaClassImpl) metaClass, effective);
            } else {
                site = new PojoMetaClassGetPropertySite(this);
            }
        }

        array.array[index] = site;
        return site;
    }

    private CallSite createClassMetaClassGetPropertySite(Class aClass) {
        CallSite site = new ClassMetaClassGetPropertySite(this, aClass);
        array.array[index] = site;
        return site;
    }

    private CallSite createPogoMetaClassGetPropertySite(GroovyObject receiver) {
        MetaClass metaClass = receiver.getMetaClass();

        CallSite site;
        if (metaClass.getClass() != MetaClassImpl.class || GroovyCategorySupport.hasCategoryInCurrentThread()) {
            site = new PogoMetaClassGetPropertySite(this, metaClass);
        } else {
            final MetaProperty effective = ((MetaClassImpl) metaClass).getEffectiveGetMetaProperty(metaClass.getClass(), receiver, name, false);
            if (effective != null) {
                if (effective instanceof CachedField)
                    site = new GetEffectivePogoFieldSite(this, metaClass, (CachedField) effective);
                else
                    site = new GetEffectivePogoPropertySite(this, metaClass, effective);
            } else {
                site = new PogoMetaClassGetPropertySite(this, metaClass);
            }
        }

        array.array[index] = site;
        return site;
    }

    private CallSite createPogoGetPropertySite(Class aClass) {
        CallSite site = new PogoGetPropertySite(this, aClass);
        array.array[index] = site;
        return site;
    }

    public final Object callGetPropertySafe(Object receiver) throws Throwable {
        if (receiver == null)
            return null;
        else
            return callGetProperty(receiver);
    }

    public final Object callGroovyObjectGetPropertySafe(Object receiver) throws Throwable {
        if (receiver == null)
            return null;
        else
            return callGroovyObjectGetProperty(receiver);
    }

}

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