/*
* Copyright 2005-2007 WSO2, Inc. (http://wso2.com)
*
* Licensed 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.wso2.carbon.core.util;
import org.apache.axiom.om.OMAbstractFactory;
import org.apache.axiom.om.OMAttribute;
import org.apache.axiom.om.OMElement;
import org.apache.axiom.om.OMFactory;
import org.apache.axiom.om.OMNamespace;
import org.apache.axiom.om.impl.builder.StAXOMBuilder;
import org.apache.axiom.om.impl.llom.factory.OMXMLBuilderFactory;
import org.apache.neethi.Policy;
import org.apache.neethi.PolicyEngine;
import org.apache.neethi.PolicyReference;
import org.apache.neethi.PolicyRegistry;
import org.wso2.carbon.utils.xml.XMLPrettyPrinter;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
public class PolicyUtil {
private static final String EMPTY_POLICY =
"<wsp:Policy xmlns:wsp=\"http://schemas.xmlsoap.org/ws/2004/09/policy\" />";
public static OMElement getPolicyAsOMElement(Policy policy) {
try {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
XMLStreamWriter writer = XMLOutputFactory.newInstance().createXMLStreamWriter(baos);
policy.serialize(writer);
writer.flush();
ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
XMLStreamReader xmlStreamReader =
XMLInputFactory.newInstance().createXMLStreamReader(bais);
StAXOMBuilder staxOMBuilder =
OMXMLBuilderFactory.createStAXOMBuilder(OMAbstractFactory.getOMFactory(),
xmlStreamReader);
return staxOMBuilder.getDocumentElement();
} catch (Exception ex) {
throw new RuntimeException("can't convert the policy to an OMElement", ex);
}
}
public static String getPolicyAsString(Policy policy) {
ByteArrayOutputStream outBuffer = new ByteArrayOutputStream();
try {
XMLStreamWriter writer =
XMLOutputFactory.newInstance().createXMLStreamWriter(outBuffer);
policy.serialize(writer);
writer.flush();
ByteArrayInputStream bais = new ByteArrayInputStream(outBuffer.toByteArray());
XMLPrettyPrinter xmlPrettyPrinter = new XMLPrettyPrinter(bais);
return xmlPrettyPrinter.xmlFormat();
} catch (XMLStreamException e) {
throw new RuntimeException("Serialization of Policy object failed " + e);
}
}
public static Policy getPolicyFromOMElement(OMElement policyElement) {
return PolicyEngine.getPolicy(policyElement);
}
public static OMElement getEmptyPolicyAsOMElement() {
ByteArrayInputStream bais = new ByteArrayInputStream(EMPTY_POLICY.getBytes());
Policy policy = PolicyEngine.getPolicy(bais);
return getPolicyAsOMElement(policy);
}
public static OMElement getWrapper(String name) {
OMFactory fac = OMAbstractFactory.getOMFactory();
OMNamespace namespace = fac.createOMNamespace("", name);
OMElement element = fac.createOMElement("Policy", namespace);
OMAttribute attribute = fac.createOMAttribute("name", namespace, name);
element.addAttribute(attribute);
return element;
}
public static String[] processPolicyElements(Iterator policyIterator, PolicyRegistry registry) {
List policyList = new ArrayList();
while (policyIterator.hasNext()) {
Object value = policyIterator.next();
if (value instanceof Policy) {
Policy policy = (Policy) value;
policyList.add(PolicyUtil.getPolicyAsString(policy));
} else if (value instanceof PolicyReference) {
PolicyReference policyReference = (PolicyReference) value;
Policy policy = registry.lookup(policyReference.getURI());
if (policy == null) {
throw new RuntimeException(policyReference.getURI() +
" cannot be resolved");
}
policyList.add(PolicyUtil.getPolicyAsString(policy));
}
}
return (String[]) policyList.toArray(new String[policyList.size()]);
}
}