Source Code Cross Referenced for ElementPathPart.java in  » Content-Management-System » apache-lenya-2.0 » org » apache » cocoon » components » xpointer » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Content Management System » apache lenya 2.0 » org.apache.cocoon.components.xpointer 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Licensed to the Apache Software Foundation (ASF) under one or more
003:         * contributor license agreements.  See the NOTICE file distributed with
004:         * this work for additional information regarding copyright ownership.
005:         * The ASF licenses this file to You under the Apache License, Version 2.0
006:         * (the "License"); you may not use this file except in compliance with
007:         * the License.  You may obtain a copy of the License at
008:         * 
009:         *      http://www.apache.org/licenses/LICENSE-2.0
010:         * 
011:         * Unless required by applicable law or agreed to in writing, software
012:         * distributed under the License is distributed on an "AS IS" BASIS,
013:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         * See the License for the specific language governing permissions and
015:         * limitations under the License.
016:         */
017:        package org.apache.cocoon.components.xpointer;
018:
019:        import org.xml.sax.SAXException;
020:        import org.xml.sax.Attributes;
021:        import org.xml.sax.Locator;
022:        import org.apache.cocoon.xml.AbstractXMLPipe;
023:        import org.apache.cocoon.components.source.SourceUtil;
024:        import org.apache.cocoon.ProcessingException;
025:
026:        import java.util.StringTokenizer;
027:        import java.util.ArrayList;
028:        import java.io.IOException;
029:
030:        /**
031:         * A custom XPointer scheme that allows to include the content of a specific element without
032:         * building a DOM. The element must be specified using an absolute path reference such as
033:         * <tt>/html/body</tt>. Namespace prefixes within these element names are supported.
034:         *
035:         * <p>This xpointer scheme will always be succesful (thus any further xpointer parts will
036:         * never be executed).
037:         *
038:         * <p>The scheme name for this XPointer scheme is 'elementpath' and its namespace is
039:         * http://apache.org/cocoon/xpointer.
040:         *
041:         * <p>See the samples for a usage example.
042:         */
043:        public class ElementPathPart implements  PointerPart {
044:            private String expression;
045:
046:            public ElementPathPart(String expression) {
047:                this .expression = expression;
048:            }
049:
050:            public boolean process(XPointerContext xpointerContext)
051:                    throws SAXException {
052:                PathInclusionPipe pipe = new PathInclusionPipe(expression,
053:                        xpointerContext);
054:                pipe.setConsumer(xpointerContext.getXmlConsumer());
055:                try {
056:                    SourceUtil.toSAX(xpointerContext.getSource(), pipe);
057:                } catch (IOException e) {
058:                    throw new SAXException(
059:                            "Exception while trying to XInclude data: "
060:                                    + e.getMessage(), e);
061:                } catch (ProcessingException e) {
062:                    throw new SAXException(
063:                            "Exception while trying to XInclude data: "
064:                                    + e.getMessage(), e);
065:                }
066:                return true;
067:            }
068:
069:            public static class PathInclusionPipe extends AbstractXMLPipe {
070:                /** The QNames that must be matched before inclusion can start. */
071:                private QName[] elementPath;
072:                /** The current element nesting level. */
073:                private int level;
074:                /** Should we currently be including? */
075:                private boolean include;
076:                /** The element nesting level since we started inclusion, used to know when to stop inclusion. */
077:                private int includeLevel;
078:
079:                /** The element nesting level that should currently be matched. */
080:                private int levelToMatch;
081:                private boolean done;
082:
083:                public PathInclusionPipe(String expression,
084:                        XPointerContext xpointerContext) throws SAXException {
085:                    // parse the expression to an array of QName objects
086:                    ArrayList path = new ArrayList();
087:                    StringTokenizer tokenizer = new StringTokenizer(expression,
088:                            "/");
089:                    while (tokenizer.hasMoreTokens()) {
090:                        String token = tokenizer.nextToken();
091:                        try {
092:                            path.add(QName.parse(token, xpointerContext));
093:                        } catch (SAXException e) {
094:                            throw new SAXException(
095:                                    "Error in element path xpointer expression \""
096:                                            + expression + "\": "
097:                                            + e.getMessage());
098:                        }
099:                    }
100:                    if (path.size() < 1)
101:                        throw new SAXException(
102:                                "Invalid element path xpointer expression \""
103:                                        + expression + "\".");
104:
105:                    this .elementPath = (QName[]) path.toArray(new QName[path
106:                            .size()]);
107:                    this .level = -1;
108:                    this .include = false;
109:                    this .levelToMatch = 0;
110:                    this .done = false;
111:                }
112:
113:                public void startElement(String namespaceURI, String localName,
114:                        String raw, Attributes a) throws SAXException {
115:                    level++;
116:
117:                    if (include) {
118:                        super .startElement(namespaceURI, localName, raw, a);
119:                        return;
120:                    }
121:
122:                    if (!done
123:                            && level == levelToMatch
124:                            && elementPath[level].matches(namespaceURI,
125:                                    localName)) {
126:                        levelToMatch++;
127:                        if (levelToMatch == elementPath.length) {
128:                            include = true;
129:                            done = true;
130:                            includeLevel = level;
131:                        }
132:                    }
133:                }
134:
135:                public void endElement(String uri, String loc, String raw)
136:                        throws SAXException {
137:                    if (include && level == includeLevel)
138:                        include = false;
139:
140:                    if (include)
141:                        super .endElement(uri, loc, raw);
142:
143:                    level--;
144:                }
145:
146:                public void setDocumentLocator(Locator locator) {
147:                    if (include)
148:                        super .setDocumentLocator(locator);
149:                }
150:
151:                public void startDocument() throws SAXException {
152:                    if (include)
153:                        super .startDocument();
154:                }
155:
156:                public void endDocument() throws SAXException {
157:                    if (include)
158:                        super .endDocument();
159:                }
160:
161:                public void characters(char c[], int start, int len)
162:                        throws SAXException {
163:                    if (include)
164:                        super .characters(c, start, len);
165:                }
166:
167:                public void ignorableWhitespace(char c[], int start, int len)
168:                        throws SAXException {
169:                    if (include)
170:                        super .ignorableWhitespace(c, start, len);
171:                }
172:
173:                public void processingInstruction(String target, String data)
174:                        throws SAXException {
175:                    if (include)
176:                        super .processingInstruction(target, data);
177:                }
178:
179:                public void skippedEntity(String name) throws SAXException {
180:                    if (include)
181:                        super .skippedEntity(name);
182:                }
183:
184:                public void startDTD(String name, String publicId,
185:                        String systemId) throws SAXException {
186:                    if (include)
187:                        super .startDTD(name, publicId, systemId);
188:                }
189:
190:                public void endDTD() throws SAXException {
191:                    if (include)
192:                        super .endDTD();
193:                }
194:
195:                public void startEntity(String name) throws SAXException {
196:                    if (include)
197:                        super .startEntity(name);
198:                }
199:
200:                public void endEntity(String name) throws SAXException {
201:                    if (include)
202:                        super .endEntity(name);
203:                }
204:
205:                public void startCDATA() throws SAXException {
206:                    if (include)
207:                        super .startCDATA();
208:                }
209:
210:                public void endCDATA() throws SAXException {
211:                    if (include)
212:                        super .endCDATA();
213:                }
214:
215:                public void comment(char ch[], int start, int len)
216:                        throws SAXException {
217:                    if (include)
218:                        super .comment(ch, start, len);
219:                }
220:
221:                public static class QName {
222:                    private String namespaceURI;
223:                    private String localName;
224:
225:                    public QName(String namespaceURI, String localName) {
226:                        this .namespaceURI = namespaceURI;
227:                        this .localName = localName;
228:                    }
229:
230:                    public static QName parse(String qName,
231:                            XPointerContext xpointerContext)
232:                            throws SAXException {
233:                        int pos = qName.indexOf(':');
234:                        if (pos > 0) {
235:                            String prefix = qName.substring(0, pos);
236:                            String localName = qName.substring(pos + 1);
237:                            String namespaceURI = xpointerContext
238:                                    .prefixToNamespace(prefix);
239:                            if (namespaceURI == null)
240:                                throw new SAXException("Namespace prefix \""
241:                                        + prefix + "\" not declared.");
242:                            return new QName(prefix, localName);
243:                        }
244:                        return new QName("", qName);
245:                    }
246:
247:                    public String getNamespaceURI() {
248:                        return namespaceURI;
249:                    }
250:
251:                    public String getLocalName() {
252:                        return localName;
253:                    }
254:
255:                    public boolean matches(String namespaceURI, String localName) {
256:                        return this.localName.equals(localName)
257:                                && this.namespaceURI.equals(namespaceURI);
258:                    }
259:                }
260:            }
261:        }
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