1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19
20 package org.apache.neethi;
21
22 import java.io.File;
23 import java.io.FileOutputStream;
24 import java.io.IOException;
25 import java.io.PrintStream;
26 import java.net.MalformedURLException;
27 import java.net.URL;
28 import java.net.URLConnection;
29
30 import javax.xml.stream.XMLInputFactory;
31 import javax.xml.stream.XMLStreamException;
32 import javax.xml.stream.XMLStreamReader;
33 import javax.xml.stream.XMLStreamWriter;
34
35 import org.apache.axiom.om.OMElement;
36 import org.apache.axiom.om.impl.builder.StAXOMBuilder;
37
38 /**
39 * PolicyReference is a wrapper that holds explict PolicyReferences.
40 */
41 public class PolicyReference implements PolicyComponent {
42
43 private String uri;
44
45 /**
46 * Sets the Policy URI
47 * @param uri the Policy URI
48 */
49 public void setURI(String uri) {
50 this.uri = uri;
51 }
52
53 /**
54 * Gets the Policy URI that is refered by self.
55 * @return a String that is the Policy URI refered by self
56 */
57 public String getURI() {
58 return uri;
59 }
60
61 public boolean equal(PolicyComponent policyComponent) {
62 if (Constants.TYPE_POLICY_REF != policyComponent.getType()) {
63 return false;
64 }
65
66 String URI = ((PolicyReference) policyComponent).getURI();
67 if (URI != null && URI.length() != 0) {
68 return URI.equals(this.uri);
69 }
70
71 return false;
72 }
73
74
75 /**
76 * Returns short value of Constants.TYPE_POLICY_REF
77 */
78 public short getType() {
79 return Constants.TYPE_POLICY_REF;
80 }
81
82 /**
83 * Throws an UnsupportedOperationException since PolicyReference.normalize()
84 * can't resolve the Policy that it refers to unless a PolicyRegistry is
85 * provided.
86 */
87 public PolicyComponent normalize() {
88 throw new UnsupportedOperationException("PolicyReference.normalize() is meaningless");
89 }
90
91 /**
92 * Returns normalized version of the Policy that is refered by self. The specified
93 * PolicyRegistry is used to lookup for the Policy that is refered and <tt>dee</tt>
94 * indicates the level of normalization fo the returning Policy.
95 *
96 * @param reg the PolicyRegistry that is used to resolved the Policy refered by self
97 * @param deep the falg to indicate whether returning Policy should be fully normailized
98 * @return the normalized version fo the Policy refered by self
99 */
100 public PolicyComponent normalize(PolicyRegistry reg, boolean deep) {
101 String key = getURI();
102 int pos = key.indexOf("#");
103 if (pos == 0) {
104 key = key.substring(1);
105 }else if(pos > 0){
106 key = key.substring(0, pos);
107 }
108
109 Policy policy = reg.lookup(key);
110
111 if (policy == null) {
112 policy = getRemoteReferencedPolicy(key);
113
114 if(policy == null){
115 throw new RuntimeException(key + " can't be resolved" );
116 }
117
118 reg.register(key, policy);
119
120 }
121
122 return policy.normalize(reg, deep);
123 }
124
125 public void serialize(XMLStreamWriter writer) throws XMLStreamException {
126
127 String wspPrefix = writer.getPrefix(Constants.URI_POLICY_NS);
128
129 if (wspPrefix == null) {
130 wspPrefix = Constants.ATTR_WSP;
131 writer.setPrefix(wspPrefix, Constants.URI_POLICY_NS);
132 }
133
134 writer.writeStartElement(wspPrefix, Constants.ELEM_POLICY_REF, Constants.URI_POLICY_NS);
135 writer.writeNamespace(Constants.ATTR_WSP, Constants.URI_POLICY_NS);
136 writer.writeAttribute(Constants.ATTR_URI, getURI());
137
138 writer.writeEndElement();
139 }
140
141 public OMElement getRemoteReferedElement(String uri){
142 OMElement documentElement = null;
143
144 try{
145
146 //create java.net URL pointing to remote resource
147 URL url = new URL(uri);
148 URLConnection connection = url.openConnection();
149 connection.setDoInput(true);
150
151 //create stax parser with the url content
152 XMLStreamReader parser = XMLInputFactory.newInstance().
153 createXMLStreamReader(connection.getInputStream());
154
155 //get the root element (in this case the envelope)
156 StAXOMBuilder builder = new StAXOMBuilder(parser);
157 documentElement = builder.getDocumentElement();
158
159 }catch(XMLStreamException se){
160 throw new RuntimeException("Bad policy content: " + uri);
161 }catch(MalformedURLException mue){
162 throw new RuntimeException("Malformed uri: " + uri);
163 }catch(IOException ioe){
164 throw new RuntimeException("Cannot reach remote resource: " + uri);
165 }
166
167 return documentElement;
168 }
169
170
171
172 public Policy getRemoteReferencedPolicy(String uri) {
173 Policy policy = null;
174
175 //extract the remote resource contents
176 OMElement policyElement = getRemoteReferedElement(uri);
177
178 //call the policy engine with already extracted content
179 policy = PolicyEngine.getPolicy(policyElement);
180
181 return policy;
182 }
183 }
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