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 * 
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 2007-2008 Sun Microsystems, Inc. All rights reserved.
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 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
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 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
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package com.sun.grizzly.attributes;

import java.util.HashMap;
import java.util.Map;
import java.util.Set;

/**
 * {@link AttributeHolder} implementation, which doesn't support indexed access
 * to {@link Attribute}s.
 *
 * @see AttributeHolder
 * @see IndexedAttributeHolder
 * 
 * @author Alexey Stashok
 */
public class NamedAttributeHolder implements AttributeHolder {
    
    protected Map attributesMap;
    protected DefaultAttributeBuilder attributeBuilder;

    public NamedAttributeHolder(AttributeBuilder attributeBuilder) {
        this.attributeBuilder = (DefaultAttributeBuilder) attributeBuilder;
        attributesMap = new HashMap();
    }
    
    /**
     * {@inheritDoc}
     */
    public Object getAttribute(String name) {
        return attributesMap.get(name);
    }
    
    /**
     * {@inheritDoc}
     */
    public void setAttribute(String name, Object value) {
        Attribute attribute = attributeBuilder.getAttributeByName(name);
        if (attribute == null) {
            attribute = attributeBuilder.createAttribute(name);
        }

        attributesMap.put(name, value);
    }
    
    /**
     * {@inheritDoc}
     */
    public Object removeAttribute(String name) {
        return attributesMap.remove(name);
    }

    /**
     * {@inheritDoc}
     */
    public Set getAttributeNames() {
        return attributesMap.keySet();
    }


    /**
     * {@inheritDoc}
     */
    public void clear() {
        attributesMap.clear();
    }

    /**
     * {@inheritDoc}
     */
    public AttributeBuilder getAttributeBuilder() {
        return attributeBuilder;
    }

    /**
     * Always returns null, as NamedAttributeHolder doesn't support
     * indexing.
     * 
     * @return null
     */
    public IndexedAttributeAccessor getIndexedAttributeAccessor() {
        return null;
    }
}