org.xacml4j.v30.pdp.profiles.MultipleResourcesViaRepeatingAttributesHandler.java Source code

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Here is the source code for org.xacml4j.v30.pdp.profiles.MultipleResourcesViaRepeatingAttributesHandler.java

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package org.xacml4j.v30.pdp.profiles;

/*
 * #%L
 * Xacml4J Core Engine Implementation
 * %%
 * Copyright (C) 2009 - 2014 Xacml4J.org
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * <http://www.gnu.org/licenses/lgpl-3.0.html>.
 * #L%
 */

import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;

import org.xacml4j.v30.Category;
import org.xacml4j.v30.CategoryId;
import org.xacml4j.v30.RequestContext;
import org.xacml4j.v30.Result;
import org.xacml4j.v30.pdp.AbstractRequestContextHandler;
import org.xacml4j.v30.pdp.PolicyDecisionPointContext;

import com.google.common.collect.Sets;

final class MultipleResourcesViaRepeatingAttributesHandler extends AbstractRequestContextHandler {
    private final static String FEATURE_ID = "urn:oasis:names:tc:xacml:3.0:profile:multiple:repeated-attribute-categories";

    public MultipleResourcesViaRepeatingAttributesHandler() {
        super(FEATURE_ID);
    }

    @Override
    public Collection<Result> handle(RequestContext request, PolicyDecisionPointContext context) {
        if (!request.containsRepeatingCategories()) {
            return handleNext(request, context);
        }
        List<Set<Category>> byCategory = new LinkedList<Set<Category>>();
        for (CategoryId categoryId : request.getCategories()) {
            Collection<Category> attributes = request.getAttributes(categoryId);
            if (attributes == null || attributes.isEmpty()) {
                continue;
            }
            byCategory.add(new LinkedHashSet<Category>(attributes));
        }
        Collection<Result> results = new LinkedList<Result>();
        Set<List<Category>> cartesian = Sets.cartesianProduct(byCategory);
        for (List<Category> requestAttr : cartesian) {
            results.addAll(handleNext(RequestContext.builder().copyOf(request, requestAttr).build(), context));
        }
        return results;
    }
}