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/*
 * =============================================================================
 * 
 *   Copyright (c) 2011-2012, The THYMELEAF team (http://www.thymeleaf.org)
 * 
 *   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.thymeleaf.spring4.context;

import java.util.Arrays;
import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Set;

import org.springframework.context.ApplicationContext;
import org.thymeleaf.util.Validate;

/**
 * 
 *   Special object made available by {@link SpringWebContext} to templates
 *   in Spring MVC applications in order to access beans in the Application Context.
 * 
 * 
 * @author Daniel Fernández
 * 
 * @since 1.0
 *
 */
public class Beans implements Map {
    
    
    private final ApplicationContext ctx;
    

    
    public Beans(final ApplicationContext ctx) {
        super();
        Validate.notNull(ctx, "Application Context cannot be null");
        this.ctx = ctx;
    }


    

    public boolean containsKey(final Object key) {
        Validate.notNull(key, "Key cannot be null");
        return this.ctx.containsBean(key.toString());
    }



    public Object get(final Object key) {
        Validate.notNull(key, "Key cannot be null");
        return this.ctx.getBean(key.toString());
    }



    public Set keySet() {
        return new LinkedHashSet(Arrays.asList(this.ctx.getBeanDefinitionNames()));
    }

    
    
    


    public int size() {
        return this.ctx.getBeanDefinitionCount();
    }



    public boolean isEmpty() {
        return this.ctx.getBeanDefinitionCount() <= 0;
    }



    public boolean containsValue(final Object value) {
        throw new UnsupportedOperationException("Method \"containsValue\" not supported in Beans object");
    }



    public Object put(final String key, final Object value) {
        throw new UnsupportedOperationException("Method \"put\" not supported in Beans object");
    }



    public void putAll(final Map m) {
        throw new UnsupportedOperationException("Method \"putAll\" not supported in Beans object");
    }



    public Object remove(Object key) {
        throw new UnsupportedOperationException("Method \"remove\" not supported in Beans object");
    }



    public void clear() {
        throw new UnsupportedOperationException("Method \"clear\" not supported in Beans object");
    }



    public Collection