org.directwebremoting.guice.util.DeclaredBy Maven / Gradle / Ivy

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DWR is easy Ajax for Java. It makes it simple to call Java code directly from Javascript. It gets rid of almost all the boiler plate code between the web browser and your Java code.

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/*
 * Copyright 2008 Tim Peierls
 *
 * 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.directwebremoting.guice.util;

import com.google.inject.matcher.AbstractMatcher;
import com.google.inject.matcher.Matcher;

import java.lang.reflect.Method;

/**
 * For matching methods declared by a given interface or superclass.
 * @author Tim Peierls [tim at peierls dot net]
 */
public class DeclaredBy extends AbstractMatcher
{
    /**
     * Returns a matcher that matches methods in subclasses
     * of {@code cls} (or {@code cls} itself) with the same
     * name and parameter types as methods declared in {@code cls}.
     */
    public static Matcher declaredBy(Class cls)
    {
        return new DeclaredBy(cls);
    }

    public boolean matches(Method method)
    {
        try
        {
            // Matches if the method is from a subclass of the given class
            // (or the class itself) and the given class declares a method
            // with the same name and parameter types.
            if (cls.isAssignableFrom(method.getDeclaringClass()))
            {
                // Return value of getDeclaredMethod is ignored. It throws
                // an exception if the method is not found.
                cls.getDeclaredMethod(method.getName(), method.getParameterTypes());

                return true;
            }
            // fall through
        }
        catch (NoSuchMethodException e)
        {
            // fall through
        }
        catch (SecurityException e)
        {
            // fall through
        }

        return false;
    }


    private DeclaredBy(Class cls)
    {
        this.cls = cls;
    }

    private final Class cls;
}