AnnotationBuilder.java

/*
 * JBoss, Home of Professional Open Source
 * Copyright 2011, Red Hat, Inc. and/or its affiliates, and individual
 * contributors by the @authors tag. See the copyright.txt in the
 * distribution for a full listing of individual contributors.
 *
 * 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.jboss.solder.reflection.annotated;

import java.lang.annotation.Annotation;
import java.lang.reflect.AnnotatedElement;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

import org.jboss.solder.messages.Messages;
import org.jboss.solder.reflection.Reflections;
import org.jboss.solder.support.SolderMessages;

/**
 * Helper class used to build annotation stores
 *
 * @author Stuart Douglas
 */
public class AnnotationBuilder {

    private transient static SolderMessages messages = Messages.getBundle(SolderMessages.class);

    private final Map<Class<? extends Annotation>, Annotation> annotationMap;
    private final Set<Annotation> annotationSet;

    AnnotationBuilder() {
        this.annotationMap = new HashMap<Class<? extends Annotation>, Annotation>();
        this.annotationSet = new HashSet<Annotation>();
    }

    public AnnotationBuilder add(Annotation annotation) {
        if (annotation == null) {
            throw new IllegalArgumentException(messages.parameterMustNotBeNull("annotation"));
        }
        annotationSet.add(annotation);
        annotationMap.put(annotation.annotationType(), annotation);
        return this;
    }

    public AnnotationBuilder remove(Class<? extends Annotation> annotationType) {
        if (annotationType == null) {
            throw new IllegalArgumentException(messages.parameterMustNotBeNull("annotationType"));
        }

        Iterator<Annotation> it = annotationSet.iterator();
        while (it.hasNext()) {
            Annotation an = it.next();
            if (annotationType.isAssignableFrom(an.annotationType())) {
                it.remove();
            }
        }
        annotationMap.remove(annotationType);
        return this;
    }

    AnnotationStore create() {
        return new AnnotationStore(annotationMap, annotationSet);
    }

    public AnnotationBuilder addAll(Set<Annotation> annotations) {
        for (Annotation annotation : annotations) {
            add(annotation);
        }
        return this;
    }

    public AnnotationBuilder addAll(AnnotationStore annotations) {
        for (Annotation annotation : annotations.getAnnotations()) {
            add(annotation);
        }
        return this;
    }

    public AnnotationBuilder addAll(AnnotatedElement element) {
        for (Annotation a : element.getAnnotations()) {
            add(a);
        }
        return this;
    }

    public <T extends Annotation> T getAnnotation(Class<T> anType) {
        return Reflections.<T>cast(annotationMap.get(anType));
    }

    public boolean isAnnotationPresent(Class<?> annotationType) {
        return annotationMap.containsKey(annotationType);
    }

    @Override
    public String toString() {
        return annotationSet.toString();
    }

}