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 * 
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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 * 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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package com.sun.grizzly.attributes;

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import com.sun.grizzly.utils.LightArrayList;

/**
 * Default {@link AttributeBuilder} implementation.
 *
 * @see AttributeBuilder
 * 
 * @author Alexey Stashok
 */
public class DefaultAttributeBuilder implements AttributeBuilder {
    protected List attributes = new LightArrayList();
    protected Map name2Attribute = new HashMap();
    
    /**
     * Method sets the index to the Attribute
     * Could be used by classes, which extend DefaultAttributeBuilder and don't
     * have access to the protected Attribute.setIndex() method.
     * 
     * @param attribute
     * @param index
     */
    protected static void setAttributeIndex(Attribute attribute, int index) {
        attribute.setIndex(index);
    }
    
    /**
     * {@inheritDoc}
     */
    public synchronized  Attribute createAttribute(String name) {
        return createAttribute(name, (T) null);
    }

    /**
     * {@inheritDoc}
     */
    public synchronized  Attribute createAttribute(String name, 
            T defaultValue) {
        Attribute attribute = name2Attribute.get(name);
        if (attribute == null) {
            attribute = new Attribute(this, name, defaultValue);
            attribute.setIndex(attributes.size());
            attributes.add(attribute);
            name2Attribute.put(name, attribute);
        }
        
        return attribute;
    }

    /**
     * {@inheritDoc}
     */
    public synchronized  Attribute createAttribute(String name, 
            NullaryFunction initializer) {
        Attribute attribute = name2Attribute.get(name);
        if (attribute == null) {
            attribute = new Attribute(this, name, initializer);
            attribute.setIndex(attributes.size());
            attributes.add(attribute);
            name2Attribute.put(name, attribute);
        }
        
        return attribute;
    }

    protected Attribute getAttributeByName(String name) {
        return name2Attribute.get(name);
    }

    protected Attribute getAttributeByIndex(int index) {
        return attributes.get(index);
    }
}