/*
 * Copyright 2015, The Querydsl Team (http://www.querydsl.com/team)
 *
 * 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 com.querydsl.core.util;

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

import javax.annotation.Nullable;

/**
 * Annotations is a merging adapter for the {@link AnnotatedElement} interface
 *
 * @author tiwe
 *
 */
public class Annotations implements AnnotatedElement {

    private final Map<Class<? extends Annotation>,Annotation> annotations = new HashMap<Class<? extends Annotation>,Annotation>();

    public Annotations(AnnotatedElement... elements) {
        for (AnnotatedElement element : elements) {
            addAnnotations(element);
        }
    }

    @SuppressWarnings("unchecked")
    @Override
    public <T extends Annotation> T getAnnotation(Class<T> annotationClass) {
        return (T) annotations.get(annotationClass);
    }

    @Override
    public Annotation[] getAnnotations() {
        return annotations.values().toArray(new Annotation[annotations.values().size()]);
    }

    @Override
    public Annotation[] getDeclaredAnnotations() {
        return getAnnotations();
    }

    @Override
    public boolean isAnnotationPresent(Class<? extends Annotation> annotationClass) {
        return annotations.containsKey(annotationClass);
    }

    public void addAnnotation(@Nullable Annotation annotation) {
        if (annotation != null) {
            annotations.put(annotation.annotationType(), annotation);
        }

    }

    public void addAnnotations(AnnotatedElement element) {
        for (Annotation annotation : element.getAnnotations()) {
            annotations.put(annotation.annotationType(), annotation);
        }
    }
}