
/*
 * @(#)TestResourceFinderModule.java
 *
 * Copyright 2004 Sun Microsystems, Inc. All Rights Reserved.
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 * modification, are permitted provided that the following conditions are met:
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 *      this list of conditions and the following disclaimer.
 * 
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 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * Neither the name of Sun Microsystems, Inc. or the names of contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 * 
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
 * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
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package org.wso2.balana;

import org.wso2.balana.attr.AnyURIAttribute;
import org.wso2.balana.attr.AttributeValue;

import org.wso2.balana.ctx.EvaluationCtx;
import org.wso2.balana.finder.ResourceFinderModule;
import org.wso2.balana.finder.ResourceFinderResult;

import java.net.URI;
import java.net.URISyntaxException;

import java.util.HashSet;


/**
 * A <code>ResourceFinderModule</code> used to handle the hierarchical
 * resources in the conformance tests.
 *
 * @author Seth Proctor
 */
public class TestResourceFinderModule extends ResourceFinderModule
{

    /**
     * Default constructor.
     */
    public TestResourceFinderModule() {

    }

    /**
     * Always returns true, since child resource resolution is supported.
     *
     * @return true
     */
    public boolean isChildSupported() {
        return true;
    }

    /**
     * Always returns true, since descendant resource resolution is supported.
     *
     * @return true
     */
    public boolean isDescendantSupported() {
        return true;
    }

    /**
     * Finds the children resources associated with the given root,
     * assuming the hierarchy is one that this module handles.
     *
     * @param root the root resource in the hierarchy
     * @param context the evaluation's context
     *
     * @return the resource hierarchy
     */
    public ResourceFinderResult findChildResources(AttributeValue root,
                                                   EvaluationCtx context) {
        // make sure we can handle this hierarchy
        if (! requestApplies(root))
            return new ResourceFinderResult();

        // add the root to the set of resolved resources
        HashSet set = new HashSet();
        set.add(root);

        // add the other resources, which are defined by the conformance tests
        try {
            set.add(new AnyURIAttribute(new URI("urn:root:child1")));
            set.add(new AnyURIAttribute(new URI("urn:root:child2")));
        } catch (URISyntaxException urise) {
            // this will never happen
        }

        return new ResourceFinderResult(set);
    }

    /**
     * Finds the children resources associated with the given root,
     * assuming the hierarchy is one that this module handles.
     *
     * @param root the root resource in the hierarchy
     * @param context the evaluation's context
     *
     * @return the resource hierarchy
     */
    public ResourceFinderResult findDescendantResources(AttributeValue root,
                                                        EvaluationCtx
                                                        context) {
        // make sure we can handle this hierarchy
        if (! requestApplies(root))
            return new ResourceFinderResult();

        // add the root to the set of resolved resources
        HashSet set = new HashSet();
        set.add(root);

        // add the other resources, which are defined by the conformance tests
        try {
            set.add(new AnyURIAttribute(new URI("urn:root:child1")));
            set.add(new AnyURIAttribute(new
                                        URI("urn:root:child1:descendant1")));
            set.add(new AnyURIAttribute(new
                                        URI("urn:root:child1:descendant2")));
            set.add(new AnyURIAttribute(new URI("urn:root:child2")));
            set.add(new AnyURIAttribute(new
                                        URI("urn:root:child2:descendant1")));
            set.add(new AnyURIAttribute(new
                                        URI("urn:root:child2:descendant2")));
        } catch (URISyntaxException urise) {
            // this will never happen
        }

        return new ResourceFinderResult(set);
    }

    /**
     * Private helper method that checks if the given resource is the root
     * of a hierarchy that we know how to handle.
     */
    private boolean requestApplies(AttributeValue root) {
        // make sure the resource-id is a URI
        if (! root.getType().toString().equals(AnyURIAttribute.identifier))
            return false;

        // make sure that the root is urn:root
        if (! ((AnyURIAttribute)root).getValue().toString().equals("urn:root"))
            return false;

        return true;
    }

}
