Source Code Cross Referenced for AbstractPattern.java in  » EJB-Server-resin-3.1.5 » resin » com » caucho » xpath » pattern » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » EJB Server resin 3.1.5 » resin » com.caucho.xpath.pattern 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
003:         *
004:         * This file is part of Resin(R) Open Source
005:         *
006:         * Each copy or derived work must preserve the copyright notice and this
007:         * notice unmodified.
008:         *
009:         * Resin Open Source is free software; you can redistribute it and/or modify
010:         * it under the terms of the GNU General Public License as published by
011:         * the Free Software Foundation; either version 2 of the License, or
012:         * (at your option) any later version.
013:         *
014:         * Resin Open Source is distributed in the hope that it will be useful,
015:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
016:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
017:         * of NON-INFRINGEMENT.  See the GNU General Public License for more
018:         * details.
019:         *
020:         * You should have received a copy of the GNU General Public License
021:         * along with Resin Open Source; if not, write to the
022:         *   Free SoftwareFoundation, Inc.
023:         *   59 Temple Place, Suite 330
024:         *   Boston, MA 02111-1307  USA
025:         *
026:         * @author Scott Ferguson
027:         */
028:
029:        package com.caucho.xpath.pattern;
030:
031:        import com.caucho.log.Log;
032:        import com.caucho.xpath.Env;
033:        import com.caucho.xpath.ExprEnvironment;
034:        import com.caucho.xpath.XPathException;
035:
036:        import org.w3c.dom.Node;
037:
038:        import java.util.logging.Logger;
039:
040:        /**
041:         * A node selection pattern.  AbstractPatterns represent compiled XPath node selectors.
042:         * They can be used to find nodes, select nodes, and test if a node matches
043:         * a pattern.
044:         *
045:         * <p>There are two types of patterns: select patterns and match patterns.
046:         * <p>Select patterns match a node relative to another node.
047:         * <code>find</code> and <code>select</code> use select patterns.
048:         * <p>Match patterns match a node in isolation.  <code>isMatch</code> uses
049:         * match patterns.
050:         */
051:        abstract public class AbstractPattern {
052:            protected static final Logger log = Log.open(AbstractPattern.class);
053:
054:            // This is the value Axis wants
055:            public static final String XMLNS = "http://www.w3.org/2000/xmlns/";
056:
057:            protected AbstractPattern _parent;
058:            protected AbstractPattern _child;
059:
060:            AbstractPattern(AbstractPattern parent) {
061:                _parent = parent;
062:
063:                if (parent != null && parent._child == null)
064:                    parent._child = this ;
065:            }
066:
067:            /**
068:             * Returns the parent pattern.
069:             */
070:            public AbstractPattern getParent() {
071:                return _parent;
072:            }
073:
074:            /**
075:             * Returns the pattern's default priority as defined by the XSLT draft.
076:             */
077:            public double getPriority() {
078:                return 0.5;
079:            }
080:
081:            /**
082:             * Returns the name of the matching node or '*' if many nodes match.
083:             *
084:             * <p>The Xsl package uses this to speed template matching.
085:             */
086:            public String getNodeName() {
087:                return "*";
088:            }
089:
090:            /**
091:             * Returns an iterator selecting nodes in document order.
092:             *
093:             * @param node the starting node.
094:             * @param env the variable environment.
095:             *
096:             * @return an iterator selecting nodes in document order.
097:             */
098:            public NodeIterator select(Node node, ExprEnvironment env)
099:                    throws XPathException {
100:                NodeIterator base = createNodeIterator(node, env,
101:                        copyPosition());
102:
103:                if (isStrictlyAscending())
104:                    return base;
105:                else
106:                    return new MergeIterator(env, base);
107:            }
108:
109:            /**
110:             * Returns an iterator selecting unique nodes.  The nodes are not
111:             * necessarily in document order.
112:             *
113:             * @param node the starting node.
114:             * @param env the variable environment.
115:             * @param context the context node.
116:             *
117:             * @return an iterator selecting unique nodes.
118:             */
119:            public NodeIterator selectUnique(Node node, ExprEnvironment env)
120:                    throws XPathException {
121:                NodeIterator base = createNodeIterator(node, env,
122:                        copyPosition());
123:
124:                if (isUnique())
125:                    return base;
126:                else
127:                    return new UniqueIterator(env, base);
128:            }
129:
130:            /**
131:             * Find any node matching the pattern.
132:             *
133:             * @param node the current node
134:             * @param env the xpath environment
135:             *
136:             * @return one of the matching nodes
137:             */
138:            public Node findAny(Node node, ExprEnvironment env)
139:                    throws XPathException {
140:                NodeIterator base = createNodeIterator(node, env,
141:                        copyPosition());
142:
143:                return base.nextNode();
144:            }
145:
146:            /**
147:             * Returns true if the pattern is strictly ascending.
148:             */
149:            public boolean isStrictlyAscending() {
150:                if (_parent != null)
151:                    return _parent.isStrictlyAscending();
152:                else
153:                    return false;
154:            }
155:
156:            /**
157:             * Returns true if the pattern's iterator returns unique nodes.
158:             */
159:            public boolean isUnique() {
160:                if (_parent != null)
161:                    return _parent.isUnique();
162:                else
163:                    return false;
164:            }
165:
166:            /**
167:             * Returns true if the pattern selects a single node
168:             */
169:            boolean isSingleSelect() {
170:                if (_parent != null)
171:                    return _parent.isSingleSelect();
172:                else
173:                    return false;
174:            }
175:
176:            /**
177:             * Returns true if the pattern returns nodes on a single level.
178:             */
179:            boolean isSingleLevel() {
180:                return isSingleSelect();
181:            }
182:
183:            /**
184:             * Creates a new node iterator.
185:             *
186:             * @param node the starting node
187:             * @param env the variable environment
188:             * @param pattern the level pattern
189:             *
190:             * @return the node iterator
191:             */
192:            public NodeIterator createNodeIterator(Node node,
193:                    ExprEnvironment env, AbstractPattern pattern)
194:                    throws XPathException {
195:                if (_parent == null)
196:                    throw new RuntimeException(String.valueOf(this ) + " "
197:                            + getClass());
198:                else
199:                    return _parent.createNodeIterator(node, env, pattern);
200:            }
201:
202:            /**
203:             * Returns the first node in the selection order.
204:             *
205:             * @param node the current node
206:             * @param variable environment
207:             *
208:             * @return the first node
209:             */
210:            public Node firstNode(Node node, ExprEnvironment env)
211:                    throws XPathException {
212:                throw new UnsupportedOperationException(String.valueOf(this )
213:                        + " " + getClass());
214:            }
215:
216:            /**
217:             * Returns the last node in the selection order.
218:             *
219:             * @param node the current node
220:             *
221:             * @return the last node
222:             */
223:            public Node lastNode(Node node) {
224:                return null;
225:            }
226:
227:            /**
228:             * Returns the next node in the selection order.
229:             *
230:             * @param node the current node
231:             * @param last the last node
232:             *
233:             * @return the next node
234:             */
235:            public Node nextNode(Node node, Node last) throws XPathException {
236:                throw new UnsupportedOperationException();
237:            }
238:
239:            /**
240:             * The core match function test if the pattern matches the node.
241:             *
242:             * @param node the node to test
243:             * @param env the variable environment.
244:             *
245:             * @return true if the node matches the pattern.
246:             */
247:            public abstract boolean match(Node node, ExprEnvironment env)
248:                    throws XPathException;
249:
250:            /**
251:             * Return true if the iterator is in document-order.
252:             */
253:            public boolean isAscending() {
254:                return true;
255:            }
256:
257:            /**
258:             * Returns the position of the node in its context for a match pattern.
259:             *
260:             * @param node the current node
261:             * @param env the variable environment
262:             * @param pattern the position pattern
263:             *
264:             * @return the node's position.
265:             */
266:            public int position(Node node, Env env, AbstractPattern pattern)
267:                    throws XPathException {
268:                return _parent.position(node, env, pattern);
269:            }
270:
271:            /**
272:             * Returns the number of nodes in its context for a match pattern.
273:             *
274:             * @param node the current node
275:             * @param env the variable environment
276:             * @param pattern the position pattern
277:             *
278:             * @return the count of nodes in the match selection
279:             */
280:            public int count(Node node, Env env, AbstractPattern pattern)
281:                    throws XPathException {
282:                return _parent.count(node, env, pattern);
283:            }
284:
285:            /**
286:             * Returns the owning axis for the pattern.
287:             */
288:            public AbstractPattern copyAxis() {
289:                if (_parent != null)
290:                    return _parent.copyAxis();
291:                else
292:                    return null;
293:            }
294:
295:            /**
296:             * Returns the position matching pattern.
297:             */
298:            public AbstractPattern copyPosition() {
299:                return this ;
300:            }
301:
302:            /**
303:             * For string conversion, returns the string prefix corresponding to
304:             * the parents.
305:             */
306:            protected String getPrefix() {
307:                if (_parent == null || _parent instanceof  FromAny)
308:                    return "";
309:                else if (_parent instanceof  FromContext) { // check for in Filter?
310:                    FromContext context = (FromContext) _parent;
311:
312:                    String name = "";
313:                    for (int i = 0; i < context.getCount(); i++) {
314:                        name += "../";
315:                    }
316:                    return name;
317:                } else if (_parent instanceof  FromRoot)
318:                    return "/";
319:                else
320:                    return _parent + "/";
321:            }
322:
323:            public String toPatternString() {
324:                return toString();
325:            }
326:        }
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