org.apache.openaz.xacml.std.dom.DOMRequestReference.java Source code

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Here is the source code for org.apache.openaz.xacml.std.dom.DOMRequestReference.java

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/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License.
 *
 */

package org.apache.openaz.xacml.std.dom;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.openaz.xacml.api.RequestReference;
import org.apache.openaz.xacml.api.XACML3;
import org.apache.openaz.xacml.std.StdMutableRequestReference;
import org.apache.openaz.xacml.std.StdRequestReference;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

/**
 * DOMRequestReference extends {@link org.apache.openaz.xacml.std.StdMutableRequestReference} with methods for
 * creation from DOM {@link org.w3c.dom.Node}s.
 */
public class DOMRequestReference {
    private static final Log logger = LogFactory.getLog(DOMRequestReference.class);

    protected DOMRequestReference() {
    }

    /**
     * Creates a new <code>DOMRequestReference</code> by parsing the given <code>Node</code> representing a
     * XACML RequestReference element.
     *
     * @param nodeRequestReference the <code>Node</code> representing the XACML RequestReference element
     * @return a new <code>DOMRequestReference</code> parsed from the given <code>Node</code>
     * @throws DOMStructureException if the conversion cannot be made
     */
    public static RequestReference newInstance(Node nodeRequestReference) throws DOMStructureException {
        Element elementRequestReference = DOMUtil.getElement(nodeRequestReference);
        boolean bLenient = DOMProperties.isLenient();

        StdMutableRequestReference stdRequestReference = new StdMutableRequestReference();

        NodeList children = elementRequestReference.getChildNodes();
        int numChildren;
        boolean sawAttributesReference = false;
        if (children != null && (numChildren = children.getLength()) > 0) {
            for (int i = 0; i < numChildren; i++) {
                Node child = children.item(i);
                if (DOMUtil.isElement(child)) {
                    if (DOMUtil.isInNamespace(child, XACML3.XMLNS)
                            && XACML3.ELEMENT_ATTRIBUTESREFERENCE.equals(child.getLocalName())) {
                        stdRequestReference.add(DOMRequestAttributesReference.newInstance(child));
                        sawAttributesReference = true;
                    } else {
                        if (!bLenient) {
                            throw DOMUtil.newUnexpectedElementException(child, nodeRequestReference);
                        }
                    }
                }
            }
        }
        if (!sawAttributesReference && !bLenient) {
            throw DOMUtil.newMissingElementException(nodeRequestReference, XACML3.XMLNS,
                    XACML3.ELEMENT_ATTRIBUTESREFERENCE);
        }
        return new StdRequestReference(stdRequestReference);
    }

    public static boolean repair(Node nodeRequestReference) throws DOMStructureException {
        Element elementRequestReference = DOMUtil.getElement(nodeRequestReference);
        boolean result = false;

        NodeList children = elementRequestReference.getChildNodes();
        int numChildren;
        boolean sawAttributesReference = false;
        if (children != null && (numChildren = children.getLength()) > 0) {
            for (int i = 0; i < numChildren; i++) {
                Node child = children.item(i);
                if (DOMUtil.isElement(child)) {
                    if (DOMUtil.isInNamespace(child, XACML3.XMLNS)
                            && XACML3.ELEMENT_ATTRIBUTESREFERENCE.equals(child.getLocalName())) {
                        result = DOMRequestAttributesReference.repair(child) || result;
                        sawAttributesReference = true;
                    } else {
                        logger.warn("Unexpected element " + child.getNodeName());
                        elementRequestReference.removeChild(child);
                        result = true;
                    }
                }
            }
        }
        if (!sawAttributesReference) {
            throw DOMUtil.newMissingAttributeException(nodeRequestReference, XACML3.XMLNS,
                    XACML3.ELEMENT_ATTRIBUTESREFERENCE);
        }

        return result;
    }
}