Source Code Cross Referenced for AbstractRuleWithConditions.java in  » EJB-Server-resin-3.1.5 » resin » com » caucho » server » rewrite » 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.server.rewrite 
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:         *
023:         *   Free Software Foundation, Inc.
024:         *   59 Temple Place, Suite 330
025:         *   Boston, MA 02111-1307  USA
026:         *
027:         * @author Sam
028:         */
029:
030:        package com.caucho.server.rewrite;
031:
032:        import com.caucho.config.Config;
033:        import com.caucho.config.ConfigException;
034:        import com.caucho.util.L10N;
035:        import com.caucho.vfs.CaseInsensitive;
036:
037:        import javax.servlet.FilterChain;
038:        import javax.servlet.ServletException;
039:        import java.util.ArrayList;
040:        import java.util.logging.Level;
041:        import java.util.logging.Logger;
042:        import java.util.regex.Matcher;
043:        import java.util.regex.Pattern;
044:
045:        public abstract class AbstractRuleWithConditions extends AbstractRule {
046:            private static final L10N L = new L10N(
047:                    AbstractRuleWithConditions.class);
048:            private static final Logger log = Logger
049:                    .getLogger(AbstractRuleWithConditions.class.getName());
050:
051:            private final boolean _isFiner;
052:            private final boolean _isFinest;
053:
054:            private Pattern _regexp;
055:            private Pattern _urlRegexp;
056:
057:            private ArrayList<Condition> _conditionList = new ArrayList<Condition>();
058:
059:            private Condition[] _conditions;
060:
061:            protected AbstractRuleWithConditions(RewriteDispatch rewriteDispatch) {
062:                super (rewriteDispatch);
063:
064:                _isFinest = log.isLoggable(Level.FINEST);
065:                _isFiner = log.isLoggable(Level.FINER);
066:            }
067:
068:            /**
069:             * Sets the regular expression pattern that must match the uri for the
070:             * rule to match, required.
071:             */
072:            public void setRegexp(Pattern regexp) {
073:                _regexp = regexp;
074:            }
075:
076:            public Pattern getRegexp() {
077:                return _regexp;
078:            }
079:
080:            /**
081:             * Sets the regular expression pattern that must match the uri for the
082:             * rule to match, required.
083:             */
084:            public void setFullUrlRegexp(Pattern regexp) {
085:                _urlRegexp = regexp;
086:            }
087:
088:            public Pattern getFullUrlRegexp() {
089:                return _urlRegexp;
090:            }
091:
092:            /**
093:             * Add a list of conditions that must pass for the rule to match.
094:             */
095:            public void addAnd(AndConditions condition) {
096:                _conditionList.add(condition);
097:            }
098:
099:            /**
100:             * Add a list of conditions one of which must pass for the rule to match.
101:             */
102:            public void addOr(OrConditions condition) {
103:                _conditionList.add(condition);
104:            }
105:
106:            /**
107:             * Add a list of conditions that must not pass for the rule to match.
108:             */
109:            public void addNot(NotConditions condition) {
110:                _conditionList.add(condition);
111:            }
112:
113:            /**
114:             * Add a condition that must pass for the rule to match.
115:             */
116:            public void addWhen(ConditionConfig condition) {
117:                _conditionList.add(condition.getCondition());
118:            }
119:
120:            /**
121:             * Add a condition that must not pass for the rule to match.
122:             */
123:            public void addUnless(ConditionConfig condition) {
124:                NotConditions not = new NotConditions();
125:                not.add(condition.getCondition());
126:                Config.init(not);
127:
128:                _conditionList.add(not);
129:            }
130:
131:            /**
132:             * Throws an exception if the passed value is null.
133:             */
134:            protected void required(Object value, String name)
135:                    throws ConfigException {
136:                if (value == null)
137:                    throw new ConfigException(L
138:                            .l("{0} requires '{1}' attribute.", getTagName(),
139:                                    name));
140:            }
141:
142:            @Override
143:            public void init() throws ConfigException {
144:                if (_regexp != null)
145:                    setLogPrefix(getLogPrefix() + " " + _regexp.pattern());
146:
147:                if (_regexp != null && CaseInsensitive.isCaseInsensitive())
148:                    _regexp = Pattern.compile(_regexp.pattern(),
149:                            Pattern.CASE_INSENSITIVE);
150:
151:                if (_conditionList.size() > 0) {
152:                    _conditions = new Condition[_conditionList.size()];
153:                    _conditionList.toArray(_conditions);
154:                }
155:
156:                _conditionList = null;
157:
158:                super .init();
159:            }
160:
161:            public FilterChain map(String uri, String queryString,
162:                    FilterChain accept) throws ServletException {
163:
164:                if (!isEnabled()) {
165:                    if (_isFinest)
166:                        log.finest(getLogPrefix() + " not enabled, no match");
167:
168:                    return getFailFilterChainMapper().map(uri, queryString,
169:                            accept);
170:                }
171:
172:                Matcher matcher;
173:
174:                if (_regexp != null) {
175:                    matcher = _regexp.matcher(uri);
176:
177:                    if (!matcher.find()) {
178:                        if (_isFinest)
179:                            log.finest(getLogPrefix() + " does not match "
180:                                    + uri);
181:
182:                        return getFailFilterChainMapper().map(uri, queryString,
183:                                accept);
184:                    }
185:                } else if (_urlRegexp != null) {
186:                    String fullUrl;
187:
188:                    if (queryString != null)
189:                        fullUrl = uri + '?' + queryString;
190:                    else
191:                        fullUrl = uri;
192:
193:                    matcher = _urlRegexp.matcher(fullUrl);
194:
195:                    if (!matcher.find()) {
196:                        return getFailFilterChainMapper().map(uri, queryString,
197:                                accept);
198:                    }
199:                } else
200:                    matcher = null;
201:
202:                String targetUri = rewrite(uri, matcher);
203:
204:                FilterChain ruleChain = dispatch(targetUri, queryString,
205:                        accept, getPassFilterChainMapper());
206:
207:                Condition[] conditions = _conditions;
208:
209:                if (conditions == null) {
210:                    if (_isFiner)
211:                        log.finer(getLogPrefix() + " '" + uri + "' --> '"
212:                                + targetUri + "'");
213:
214:                    if (ruleChain == null)
215:                        return getPassFilterChainMapper().map(uri, queryString,
216:                                accept);
217:                    else
218:                        return ruleChain;
219:                } else {
220:                    FilterChain passChain = ruleChain;
221:
222:                    if (passChain == null) {
223:                        passChain = new ContinueMapFilterChain(targetUri,
224:                                queryString, accept, getPassFilterChainMapper());
225:                    }
226:
227:                    FilterChain failChain = new ContinueMapFilterChain(uri,
228:                            queryString, accept, getFailFilterChainMapper());
229:
230:                    return new ConditionFilterChain(getLogPrefix(), uri,
231:                            targetUri, conditions, passChain, failChain);
232:
233:                }
234:            }
235:
236:            /**
237:             * Return a rewritten uri to use for the rest of the processing of
238:             * rewrite-dispatch.
239:             *
240:             * @param matcher a Matcher obtained from doing a regexp comparison, or null
241:             * if there was no regexp comparison
242:             */
243:            public String rewrite(String uri, Matcher matcher) {
244:                return uri;
245:            }
246:
247:            /**
248:             * Returns the FilterChain to invoke if the rule is successful, null indicates
249:             * that the rule does not invoke a FilterChain.
250:             *
251:             * @param targetUri the target uri, possibly rewritten
252:             * @param accept a FilterChain that stops evaluation of rewrite rules and
253:             * @param next
254:             */
255:            abstract public FilterChain dispatch(String targetUri,
256:                    String queryString, FilterChain accept,
257:                    FilterChainMapper next) throws ServletException;
258:
259:            @Override
260:            public void destroy() {
261:                Condition[] conditions = _conditions;
262:                _conditions = null;
263:
264:                if (conditions != null) {
265:
266:                    for (Condition condition : conditions) {
267:                        // XXX: s/b Config.destroy()
268:                        try {
269:                            condition.destroy();
270:                        } catch (Exception ex) {
271:                            log.log(Level.FINER, ex.toString(), ex);
272:                        }
273:                    }
274:                }
275:
276:                super.destroy();
277:            }
278:
279:        }
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