org.richfaces.tests.annotationtool.processor.groups.command.AnnotationAttribute.java Source code

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Here is the source code for org.richfaces.tests.annotationtool.processor.groups.command.AnnotationAttribute.java

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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2012, Red Hat, Inc. and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 * 
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 * 
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.richfaces.tests.annotationtool.processor.groups.command;

import com.google.common.base.Predicate;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import java.lang.annotation.Annotation;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Helper class for retrieving annotation value from given annotation method name.
 * @author <a href="mailto:jstefek@redhat.com">Jiri Stefek</a>
 */
public class AnnotationAttribute<T> {

    private final String name;

    public AnnotationAttribute(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public T getValueFromAnnotation(Annotation annotation) {
        List<Method> listOfMethods = Lists.<Method>newArrayList(annotation.getClass().getDeclaredMethods());
        Method method = Iterables.find(listOfMethods, new MethodNamePredicate());
        try {
            return (T) method.invoke(annotation);
        } catch (IllegalAccessException ex) {
            Logger.getLogger(AnnotationAttribute.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IllegalArgumentException ex) {
            Logger.getLogger(AnnotationAttribute.class.getName()).log(Level.SEVERE, null, ex);
        } catch (InvocationTargetException ex) {
            Logger.getLogger(AnnotationAttribute.class.getName()).log(Level.SEVERE, null, ex);
        }
        return null;
    }

    private class MethodNamePredicate implements Predicate<Method> {

        public boolean apply(Method input) {
            return input.getName().equals(name);
        }
    }

    @Override
    public String toString() {
        return "AnnotationAttribute{" + "name=" + name + '}';
    }
}