Source Code Cross Referenced for RegexRules.java in  » Library » Apache-commons-digester-1.8-src » org » apache » commons » digester » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » Apache commons digester 1.8 src » org.apache.commons.digester 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* $Id: RegexRules.java 471661 2006-11-06 08:09:25Z skitching $
002:         *
003:         * Licensed to the Apache Software Foundation (ASF) under one or more
004:         * contributor license agreements.  See the NOTICE file distributed with
005:         * this work for additional information regarding copyright ownership.
006:         * The ASF licenses this file to You under the Apache License, Version 2.0
007:         * (the "License"); you may not use this file except in compliance with
008:         * the License.  You may obtain a copy of the License at
009:         * 
010:         *      http://www.apache.org/licenses/LICENSE-2.0
011:         * 
012:         * Unless required by applicable law or agreed to in writing, software
013:         * distributed under the License is distributed on an "AS IS" BASIS,
014:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015:         * See the License for the specific language governing permissions and
016:         * limitations under the License.
017:         */
018:
019:        package org.apache.commons.digester;
020:
021:        import java.util.ArrayList;
022:        import java.util.Iterator;
023:        import java.util.List;
024:
025:        /**
026:         * <p>Rules implementation that uses regular expression matching for paths.</p>
027:         *
028:         * <p>The regex implementation is pluggable, allowing different strategies to be used.
029:         * The basic way that this class work does not vary.
030:         * All patterns are tested to see if they match the path using the regex matcher.
031:         * All those that do are return in the order which the rules were added.</p>
032:         *
033:         * @since 1.5
034:         */
035:
036:        public class RegexRules extends AbstractRulesImpl {
037:
038:            // --------------------------------------------------------- Fields
039:
040:            /** All registered <code>Rule</code>'s  */
041:            private ArrayList registeredRules = new ArrayList();
042:            /** The regex strategy used by this RegexRules */
043:            private RegexMatcher matcher;
044:
045:            // --------------------------------------------------------- Constructor
046:
047:            /**
048:             * Construct sets the Regex matching strategy.
049:             *
050:             * @param matcher the regex strategy to be used, not null
051:             * @throws IllegalArgumentException if the strategy is null
052:             */
053:            public RegexRules(RegexMatcher matcher) {
054:                setRegexMatcher(matcher);
055:            }
056:
057:            // --------------------------------------------------------- Properties
058:
059:            /** 
060:             * Gets the current regex matching strategy.
061:             */
062:            public RegexMatcher getRegexMatcher() {
063:                return matcher;
064:            }
065:
066:            /** 
067:             * Sets the current regex matching strategy.
068:             *
069:             * @param matcher use this RegexMatcher, not null
070:             * @throws IllegalArgumentException if the strategy is null
071:             */
072:            public void setRegexMatcher(RegexMatcher matcher) {
073:                if (matcher == null) {
074:                    throw new IllegalArgumentException(
075:                            "RegexMatcher must not be null.");
076:                }
077:                this .matcher = matcher;
078:            }
079:
080:            // --------------------------------------------------------- Public Methods
081:
082:            /**
083:             * Register a new Rule instance matching the specified pattern.
084:             *
085:             * @param pattern Nesting pattern to be matched for this Rule
086:             * @param rule Rule instance to be registered
087:             */
088:            protected void registerRule(String pattern, Rule rule) {
089:                registeredRules.add(new RegisteredRule(pattern, rule));
090:            }
091:
092:            /**
093:             * Clear all existing Rule instance registrations.
094:             */
095:            public void clear() {
096:                registeredRules.clear();
097:            }
098:
099:            /**
100:             * Finds matching rules by using current regex matching strategy.
101:             * The rule associated with each path that matches is added to the list of matches.
102:             * The order of matching rules is the same order that they were added.
103:             *
104:             * @param namespaceURI Namespace URI for which to select matching rules,
105:             *  or <code>null</code> to match regardless of namespace URI
106:             * @param pattern Nesting pattern to be matched
107:             * @return a list of matching <code>Rule</code>'s
108:             */
109:            public List match(String namespaceURI, String pattern) {
110:                //
111:                // not a particularly quick implementation
112:                // regex is probably going to be slower than string equality
113:                // so probably should have a set of strings
114:                // and test each only once
115:                //
116:                // XXX FIX ME - Time And Optimize
117:                //
118:                ArrayList rules = new ArrayList(registeredRules.size());
119:                Iterator it = registeredRules.iterator();
120:                while (it.hasNext()) {
121:                    RegisteredRule next = (RegisteredRule) it.next();
122:                    if (matcher.match(pattern, next.pattern)) {
123:                        rules.add(next.rule);
124:                    }
125:                }
126:                return rules;
127:            }
128:
129:            /**
130:             * Return a List of all registered Rule instances, or a zero-length List
131:             * if there are no registered Rule instances.  If more than one Rule
132:             * instance has been registered, they <strong>must</strong> be returned
133:             * in the order originally registered through the <code>add()</code>
134:             * method.
135:             */
136:            public List rules() {
137:                ArrayList rules = new ArrayList(registeredRules.size());
138:                Iterator it = registeredRules.iterator();
139:                while (it.hasNext()) {
140:                    rules.add(((RegisteredRule) it.next()).rule);
141:                }
142:                return rules;
143:            }
144:
145:            /** Used to associate rules with paths in the rules list */
146:            private class RegisteredRule {
147:                String pattern;
148:                Rule rule;
149:
150:                RegisteredRule(String pattern, Rule rule) {
151:                    this.pattern = pattern;
152:                    this.rule = rule;
153:                }
154:            }
155:        }
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