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package net.sf.cuf.model;

import java.util.Map;
import java.util.StringTokenizer;

/**
 * This adapter maps aspect names to a Map get/put operation.
 * The disadvantege to a MethodAccessAdapter is that isEditable always
 * returns true and most checks can't be done during the construction,
 * so the MapAccessAdapter is less fail fast than the MethodAccessAdapter.
 */
public class MapAccessAdapter implements AspectAccessAdapter
{
    // the keys for the map, never null
    private String[] mKeys;

    /**
     * Creates a new adapter for a Map-based source.
     * @param pAspectName the aspect name, may be separated by AspectAdapter.SEPARATOR
     */
    public MapAccessAdapter(final String pAspectName)
    {
        // setup mKeys from pAspectName
        StringTokenizer st= new StringTokenizer(pAspectName, AspectAdapter.SEPARATOR);
        mKeys= new String[st.countTokens()];
        for (int i= 0; i< mKeys.length; i++ )
        {
            mKeys[i]= st.nextToken();
        }
    }

    /**
     * Returns always true.
     * @return true
     */
    public boolean isEditable()
    {
        return true;
    }

    /**
     * Extract the value from the source.
     * @param pSource the source, may be null
     * @return null or the value
     */
    public Object getValue(final Object pSource)
    {
        if (pSource==null)
        {
            return null;
        }

        Object aspect= pSource;
        for (final String mKey : mKeys)
        {
            Map source = (Map) aspect;
            aspect = source.get(mKey);
        }
        return aspect;
    }

    /**
     * Sets a value to the source.
     * @param pSource the source, never null
     * @param pValue the new value, may be null
     */
    public void setValue(final Object pSource, final Object pValue)
    {
        Object aspect= pSource;
        Map    source= (Map)aspect;
        for (final String mKey : mKeys)
        {
            source = (Map) aspect;
            aspect = source.get(mKey);
        }
        source.put(mKeys[mKeys.length-1], pValue);
    }
}