Package org.apache.neethi.builders.xml

Source Code of org.apache.neethi.builders.xml.XmlPrimtiveAssertion

/*
* 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.neethi.builders.xml;

import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamWriter;

import org.apache.axiom.om.OMAttribute;
import org.apache.axiom.om.OMElement;
import org.apache.neethi.All;
import org.apache.neethi.Assertion;
import org.apache.neethi.Constants;
import org.apache.neethi.ExactlyOne;
import org.apache.neethi.Policy;
import org.apache.neethi.PolicyComponent;
import org.apache.neethi.PolicyRegistry;

/**
* XmlPrimitiveAssertion wraps an OMElement s.t. any unkown elements can be
* treated an assertions if there is no AssertionBuilder that can build an
* assertion from that OMElement.
*
*/
public class XmlPrimtiveAssertion implements Assertion {

    OMElement element;

    boolean isOptional;

    /**
     * Constructs a XmlPrimitiveAssertion from an OMElement.
     *
     * @param element
     *            the OMElement from which the XmlAssertion is constructed
     */
    public XmlPrimtiveAssertion(OMElement element) {
        setValue(element);
        setOptionality(element);
    }

    /**
     * Returns the QName of the wrapped OMElement.
     */
    public QName getName() {
        return (element != null) ? element.getQName() : null;
    }

    /**
     * Sets the wrapped OMElement.
     *
     * @param element
     *            the OMElement to be set as wrapped
     */
    public void setValue(OMElement element) {
        this.element = element;
    }

    /**
     * Returns the wrapped OMElement.
     *
     * @return the wrapped OMElement
     */
    public OMElement getValue() {
        return element;
    }

    /**
     * Returns <tt>true</tt> if the wrapped element that assumed to be an
     * assertion, is optional.
     */
    public boolean isOptional() {
        return isOptional;
    }

    /**
     * Returns the partial normalized version of the wrapped OMElement, that is
     * assumed to be an assertion.
     */
    public PolicyComponent normalize() {
        if (isOptional) {
            Policy policy = new Policy();
            ExactlyOne exactlyOne = new ExactlyOne();

            All all = new All();
            OMElement omElement = element.cloneOMElement();

            omElement.removeAttribute(omElement
                    .getAttribute(Constants.Q_ELEM_OPTIONAL_ATTR));
            all.addPolicyComponent(new XmlPrimtiveAssertion(omElement));
            exactlyOne.addPolicyComponent(all);

            exactlyOne.addPolicyComponent(new All());
            policy.addPolicyComponent(exactlyOne);

            return policy;
        }

        return this;
    }

    /**
     * Throws an UnsupportedOperationException since an assertion of an unknown
     * element can't be fully normalized due to it's unkonwn composite.
     */
    public PolicyComponent normalize(boolean isDeep) {
        throw new UnsupportedOperationException();
    }

    public void serialize(XMLStreamWriter writer) throws XMLStreamException {
        if (element != null) {
            element.serialize(writer);

        } else {
            throw new RuntimeException("Wrapped Element is not set");
        }
    }

    /**
     * Returns Constants.TYPE_ASSERTION
     */
    public final short getType() {
        return Constants.TYPE_ASSERTION;
    }

    private void setOptionality(OMElement element) {
        OMAttribute attribute = element
                .getAttribute(Constants.Q_ELEM_OPTIONAL_ATTR);
        if (attribute != null) {
            this.isOptional = (new Boolean(attribute.getAttributeValue())
                    .booleanValue());

        } else {
            this.isOptional = false;
        }
    }

    public boolean equal(PolicyComponent policyComponent) {
        if (policyComponent.getType() != Constants.TYPE_ASSERTION) {
            return false;
        }

        return getName().equals(((Assertion) policyComponent).getName());
    }
}
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