Source Code Cross Referenced for WebServiceClient.java in  » Development » Javolution » javolution » xml » ws » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Development » Javolution » javolution.xml.ws 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Javolution - Java(TM) Solution for Real-Time and Embedded Systems
003:         * Copyright (C) 2007 - Javolution (http://javolution.org/)
004:         * All rights reserved.
005:         * 
006:         * Permission to use, copy, modify, and distribute this software is
007:         * freely granted, provided that this notice is preserved.
008:         */
009:        package javolution.xml.ws;
010:
011:        import j2me.lang.CharSequence;
012:        import j2me.lang.UnsupportedOperationException;
013:        import java.io.IOException;
014:        import javolution.io.AppendableWriter;
015:        import javolution.io.UTF8StreamWriter;
016:        import javolution.text.Text;
017:        import javolution.text.TextBuilder;
018:        import javolution.xml.XMLObjectReader;
019:        import javolution.xml.XMLObjectWriter;
020:        import javolution.xml.stream.XMLStreamException;
021:        import javolution.xml.stream.XMLStreamReader;
022:        import javolution.xml.stream.XMLStreamWriter;
023:
024:        /**
025:         * <p> This class provides a simple web service client capable of leveraging  
026:         *     Javolution {@link javolution.xml XML marshalling/unmarshalling}.</p>
027:         *     
028:         * <p> Sub-classes may work from WSDL files, {@link javolution.xml.XMLFormat
029:         *     XMLFormat} or directly with the XML streams (StAX). For example:[code]
030:         *     private static class HelloWorld extends WebServiceClient  {
031:         *         protected void writeRequest(XMLObjectWriter out) throws XMLStreamException {
032:         *             XMLStreamWriter xml = out.getStreamWriter();
033:         *             xml.writeDefaultNamespace("http://www.openuri.org/");
034:         *             xml.writeEmptyElement("helloWorld"); // Operation name.
035:         *         }
036:         *         protected void readResponse(XMLObjectReader in) throws XMLStreamException {
037:         *             XMLStreamReader xml = in.getStreamReader();
038:         *             xml.require(START_ELEMENT, "http://www.openuri.org/", "string");
039:         *             xml.next(); // Move to character content.
040:         *             System.out.println(xml.getText());
041:         *         }
042:         *     }
043:         *     WebServiceClient ws = new HelloWorld().setAddress("http://acme.com:80/HelloWorld.jws");
044:         *     ws.invoke();
045:         *     
046:         *      > Hello World!
047:         *     [/code]</p>
048:         *     
049:         * <p><b>Note:</b> At this moment, this class is supported only on the J2SE 
050:         *                 platform. Soon, it will also be supported on mobile devices
051:         *                 through the CLDC/MIDP Generic Connection framework.</p>
052:         *           
053:         * @author  <a href="mailto:jean-marie@dautelle.com">Jean-Marie Dautelle</a>
054:         * @version 5.2, September 16, 2007
055:         */
056:        public abstract class WebServiceClient {
057:
058:            /**
059:             * Holds standard SOAP envelope prefix.
060:             */
061:            public static final String ENVELOPE_PREFIX = "env";
062:
063:            /**
064:             * Holds standard SOAP envelope namespace.
065:             */
066:            public static final String ENVELOPE_URI = "http://schemas.xmlsoap.org/soap/envelope/";
067:
068:            /**
069:             * Holds the URL (J2SE).
070:             */
071:            Object _url;
072:
073:            /**
074:             * Default constructor (address not set).
075:             */
076:            public WebServiceClient() {
077:                /*@JVM-1.4+@
078:                if (true) return;
079:                /**/
080:                throw new UnsupportedOperationException(
081:                        "J2ME Not Supported Yet");
082:            }
083:
084:            /**
085:             * Sets the address of this web service.
086:             * 
087:             * @param address the service full address. 
088:             */
089:            public WebServiceClient setAddress(String address) {
090:                /*@JVM-1.4+@    
091:                try {
092:                    _url = new java.net.URL(address);
093:                } catch (java.net.MalformedURLException e) {
094:                    throw new IllegalArgumentException("Malformed URL: " + address);
095:                }
096:                /**/
097:                return this ;
098:            }
099:
100:            /**
101:             * Invokes the web service.
102:             */
103:            public void invoke() throws IOException, XMLStreamException {
104:                try {
105:                    // Formats the request message (we cannot write directly to 
106:                    // the output stream because the http request requires the length.
107:                    _out.setOutput(_buffer);
108:                    _writer.setOutput(_out);
109:                    final XMLStreamWriter xmlOut = _writer.getStreamWriter();
110:                    xmlOut.setPrefix(csq(ENVELOPE_PREFIX), csq(ENVELOPE_URI));
111:                    xmlOut
112:                            .writeStartElement(csq(ENVELOPE_URI),
113:                                    csq("Envelope"));
114:                    xmlOut.writeNamespace(csq(ENVELOPE_PREFIX),
115:                            csq(ENVELOPE_URI));
116:                    xmlOut.writeStartElement(csq(ENVELOPE_URI), csq("Header"));
117:                    xmlOut.writeEndElement();
118:                    xmlOut.writeStartElement(csq(ENVELOPE_URI), csq("Body"));
119:                    writeRequest(_writer);
120:                    _writer.close();
121:
122:                    // Sends the request.
123:                    if (_url == null)
124:                        throw new IOException("URL not set");
125:                    /*@JVM-1.4+@    
126:                    java.net.HttpURLConnection http = (java.net.HttpURLConnection) 
127:                       ((java.net.URL)_url).openConnection();
128:                    http.setRequestProperty("Content-Length", String.valueOf(_buffer
129:                            .length()));
130:                    http.setRequestProperty("Content-Type", "text/xml; charset=utf-8");
131:                    // httpConn.setRequestProperty("SOAPAction", "");
132:                    http.setRequestMethod("POST");
133:                    http.setDoOutput(true);
134:                    http.setDoInput(true);
135:                    _utf8Writer.setOutput(http.getOutputStream());
136:                    /**/
137:                    _buffer.print(_utf8Writer);
138:                    _utf8Writer.close();
139:
140:                    // Reads the response.
141:                    /*@JVM-1.4+@    
142:                    _reader.setInput(http.getInputStream());
143:                    /**/
144:                    final XMLStreamReader xmlIn = _reader.getStreamReader();
145:                    while (xmlIn.hasNext()) {
146:                        if ((xmlIn.next() == XMLStreamReader.START_ELEMENT)
147:                                && xmlIn.getLocalName().equals("Body")
148:                                && xmlIn.getNamespaceURI().equals(ENVELOPE_URI)) {
149:                            // Found body, position reader to next element.
150:                            xmlIn.next();
151:                            readResponse(_reader);
152:                            break;
153:                        }
154:                    }
155:
156:                } finally {
157:                    _reader.close();
158:                    _writer.reset();
159:                    _out.reset();
160:                    _buffer.reset();
161:                    _utf8Writer.reset();
162:                    _reader.reset();
163:                }
164:            }
165:
166:            private final TextBuilder _buffer = new TextBuilder();
167:            private final AppendableWriter _out = new AppendableWriter();
168:            private final XMLObjectWriter _writer = new XMLObjectWriter();
169:            private final UTF8StreamWriter _utf8Writer = new UTF8StreamWriter();
170:            private final XMLObjectReader _reader = new XMLObjectReader();
171:
172:            /**/
173:
174:            /**
175:             * Writes the web service request (SOAP body).
176:             * 
177:             * @param out the XML object writer.
178:             */
179:            protected abstract void writeRequest(XMLObjectWriter out)
180:                    throws XMLStreamException;
181:
182:            /**
183:             * Reads the web service response (SOAP body). The default implementation
184:             * writes the body XML events to <code>System.out</code>.
185:             * 
186:             * @param in the XML object reader.
187:             */
188:            protected void readResponse(XMLObjectReader in)
189:                    throws XMLStreamException {
190:                final XMLStreamReader xml = in.getStreamReader();
191:                while (xml.hasNext()) {
192:                    switch (xml.next()) {
193:                    case XMLStreamReader.START_DOCUMENT:
194:                        System.out.println("Start Document");
195:                        break;
196:                    case XMLStreamReader.END_DOCUMENT:
197:                        System.out.println("End Document.");
198:                        break;
199:                    case XMLStreamReader.START_ELEMENT:
200:                        System.out.println("Start Element: "
201:                                + xml.getLocalName() + "("
202:                                + xml.getNamespaceURI() + ")");
203:                        for (int i = 0, n = xml.getAttributeCount(); i < n; i++) {
204:                            System.out.println("   Attribute: "
205:                                    + xml.getAttributeLocalName(i) + "("
206:                                    + xml.getAttributeNamespace(i)
207:                                    + "), Value: " + xml.getAttributeValue(i));
208:                        }
209:                        break;
210:                    case XMLStreamReader.END_ELEMENT:
211:                        if (xml.getLocalName().equals("Body")
212:                                && xml.getNamespaceURI().equals(ENVELOPE_URI))
213:                            return; // End body.
214:                        System.out.println("End Element: " + xml.getLocalName()
215:                                + "(" + xml.getNamespaceURI() + ")");
216:                        break;
217:                    case XMLStreamReader.CHARACTERS:
218:                        System.out.println("Characters: " + xml.getText());
219:                        break;
220:                    case XMLStreamReader.CDATA:
221:                        System.out.println("CDATA: " + xml.getText());
222:                        break;
223:                    case XMLStreamReader.COMMENT:
224:                        System.out.println("Comment: " + xml.getText());
225:                        break;
226:                    case XMLStreamReader.SPACE:
227:                        System.out.println("Space");
228:                        break;
229:                    default:
230:                        System.out.println(xml);
231:                    }
232:                }
233:
234:            }
235:
236:            // For J2ME compatiblity.
237:            private static final CharSequence csq(Object string) {
238:                return (string instanceof  CharSequence) ? (CharSequence) string
239:                        : Text.valueOf(string);
240:
241:            }
242:        }
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