externalpolicyserializer.java

来自「开源的axis2框架的源码。用于开发WEBSERVER」· Java 代码 · 共 135 行

/*
 * 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.axis2.util;

import org.apache.neethi.Assertion;
import org.apache.neethi.Constants;
import org.apache.neethi.Policy;

import javax.xml.namespace.QName;
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamWriter;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class ExternalPolicySerializer {

    private List assertions2Filter = new ArrayList();

    public void addAssertionToFilter(QName name) {
        assertions2Filter.add(name);
    }

    public void setAssertionsToFilter(List assertions2Filter) {
        this.assertions2Filter = assertions2Filter;
    }

    public List getAssertionsToFilter() {
        return assertions2Filter;
    }


    public void serialize(Policy policy, OutputStream os) {

        try {
            XMLStreamWriter writer = XMLOutputFactory.newInstance()
                    .createXMLStreamWriter(os);
            policy = (Policy) policy.normalize(false);

            String prefix = writer.getPrefix(Constants.ATTR_WSP);
            String wsuPrefix = writer.getPrefix(Constants.URI_WSU_NS);

            if (prefix == null) {
                prefix = Constants.ATTR_WSP;
                writer.setPrefix(prefix, Constants.URI_POLICY_NS);
            }

            if (wsuPrefix == null) {
                // TODO move this 'wsu' value to Neethi2 constants
                wsuPrefix = "wsu";
                writer.setPrefix(wsuPrefix, Constants.URI_WSU_NS);
            }

            // write <wsp:Policy tag

            writer.writeStartElement(prefix, Constants.ELEM_POLICY,
                                     Constants.URI_POLICY_NS);
            // write xmlns:wsp=".."
            writer.writeNamespace(prefix, Constants.URI_POLICY_NS);

            String name = policy.getName();
            if (name != null) {
                // write Name=".."
                writer.writeAttribute(Constants.ATTR_NAME, name);
            }

            String id = policy.getId();
            if (id != null) {
                // write wsu:Id=".."
                writer.writeAttribute(Constants.ATTR_ID, id);
            }

            writer.writeStartElement(Constants.ATTR_WSP,
                                     Constants.ELEM_EXACTLYONE, Constants.URI_POLICY_NS);
            // write <wsp:ExactlyOne>

            List assertionList;

            for (Iterator iterator = policy.getAlternatives(); iterator
                    .hasNext();) {

                assertionList = (List) iterator.next();

                // write <wsp:All>
                writer.writeStartElement(Constants.ATTR_WSP, Constants.ELEM_ALL,
                                         Constants.URI_POLICY_NS);

                Assertion assertion;

                for (Iterator assertions = assertionList.iterator(); assertions
                        .hasNext();) {
                    assertion = (Assertion) assertions.next();
                    if (assertions2Filter.contains(assertion.getName())) {
                        // since this is an assertion to filter, we will not serialize this
                        continue;
                    }
                    assertion.serialize(writer);
                }

                // write </wsp:All>
                writer.writeEndElement();
            }

            // write </wsp:ExactlyOne>
            writer.writeEndElement();
            // write </wsp:Policy>
            writer.writeEndElement();

            writer.flush();

        } catch (Exception ex) {

            throw new RuntimeException(ex);

        }
    }
}