Source Code Cross Referenced for FromXmlRuleSet.java in  » Library » Apache-commons-digester-1.8-src » org » apache » commons » digester » xmlrules » 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.xmlrules 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* $Id: FromXmlRuleSet.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.xmlrules;
020:
021:        import java.net.URL;
022:
023:        import org.apache.commons.digester.Digester;
024:        import org.apache.commons.digester.RuleSetBase;
025:
026:        import org.xml.sax.InputSource;
027:
028:        /**
029:         * A Digester rule set where the rules come from an XML file.
030:         *
031:         * @since 1.2
032:         */
033:        public class FromXmlRuleSet extends RuleSetBase {
034:
035:            public static final String DIGESTER_DTD_PATH = "org/apache/commons/digester/xmlrules/digester-rules.dtd";
036:
037:            /**
038:             * The file containing the Digester rules, in XML.
039:             */
040:            private XMLRulesLoader rulesLoader;
041:
042:            /**
043:             * The rule set for parsing the Digester rules
044:             */
045:            private DigesterRuleParser parser;
046:
047:            /**
048:             * The digester for loading the rules xml.
049:             */
050:            private Digester rulesDigester;
051:
052:            /**
053:             * Constructs a FromXmlRuleSet using the default DigesterRuleParser and
054:             * rulesDigester.
055:             * @param rulesXml the path to the XML document defining the Digester rules
056:             */
057:            public FromXmlRuleSet(URL rulesXml) {
058:                this (rulesXml, new DigesterRuleParser(), new Digester());
059:            }
060:
061:            /**
062:             * Constructs a FromXmlRuleSet using the default DigesterRuleParser and
063:             * a ruleDigester for loading the rules xml.
064:             * @param rulesXml the path to the XML document defining the Digester rules
065:             * @param rulesDigester the digester to read the rules xml.
066:             */
067:            public FromXmlRuleSet(URL rulesXml, Digester rulesDigester) {
068:                this (rulesXml, new DigesterRuleParser(), rulesDigester);
069:            }
070:
071:            /**
072:             * @param rulesXml the path to the XML document defining the Digester rules
073:             * @param parser an instance of DigesterRuleParser, for parsing the rules from XML
074:             */
075:            public FromXmlRuleSet(URL rulesXml, DigesterRuleParser parser) {
076:                this (rulesXml, parser, new Digester());
077:            }
078:
079:            /**
080:             * @param rulesXml the path to the XML document defining the Digester rules
081:             * @param parser an instance of DigesterRuleParser, for parsing the rules from XML
082:             * @param rulesDigester the digester used to load the Xml rules.
083:             */
084:            public FromXmlRuleSet(URL rulesXml, DigesterRuleParser parser,
085:                    Digester rulesDigester) {
086:                init(new URLXMLRulesLoader(rulesXml), parser, rulesDigester);
087:            }
088:
089:            /**
090:             * Constructs a FromXmlRuleSet using the default DigesterRuleParser and
091:             * rulesDigester.
092:             * @param inputSource load the xml rules from this InputSource
093:             */
094:            public FromXmlRuleSet(InputSource inputSource) {
095:                this (inputSource, new DigesterRuleParser(), new Digester());
096:            }
097:
098:            /**
099:             * Constructs a FromXmlRuleSet using the default DigesterRuleParser and
100:             * a ruleDigester for loading the rules xml.
101:             * @param inputSource load the xml rules from this InputSource
102:             * @param rulesDigester the digester to read the rules xml.
103:             */
104:            public FromXmlRuleSet(InputSource inputSource,
105:                    Digester rulesDigester) {
106:                this (inputSource, new DigesterRuleParser(), rulesDigester);
107:            }
108:
109:            /**
110:             * @param inputSource load the xml rules from this InputSource
111:             * @param parser an instance of DigesterRuleParser, for parsing the rules from XML
112:             */
113:            public FromXmlRuleSet(InputSource inputSource,
114:                    DigesterRuleParser parser) {
115:                this (inputSource, parser, new Digester());
116:            }
117:
118:            /**
119:             * @param inputSource load the xml rules from this InputSource
120:             * @param parser an instance of DigesterRuleParser, for parsing the rules from XML
121:             * @param rulesDigester the digester used to load the Xml rules.
122:             */
123:            public FromXmlRuleSet(InputSource inputSource,
124:                    DigesterRuleParser parser, Digester rulesDigester) {
125:                init(new InputSourceXMLRulesLoader(inputSource), parser,
126:                        rulesDigester);
127:            }
128:
129:            /**
130:             * Base constructor
131:             */
132:            private void init(XMLRulesLoader rulesLoader,
133:                    DigesterRuleParser parser, Digester rulesDigester) {
134:                this .rulesLoader = rulesLoader;
135:                this .parser = parser;
136:                this .rulesDigester = rulesDigester;
137:            }
138:
139:            /**
140:             * Adds to the digester the set of Rule instances defined in the
141:             * XML file for this rule set.
142:             * @see org.apache.commons.digester.RuleSetBase
143:             */
144:            public void addRuleInstances(
145:                    org.apache.commons.digester.Digester digester)
146:                    throws XmlLoadException {
147:                addRuleInstances(digester, null);
148:            }
149:
150:            /**
151:             * Adds to the digester the set of Rule instances defined in the
152:             * XML file for this rule set.
153:             * <p>
154:             * Note that this method doesn't have a matching one on the DigesterLoader
155:             * class, because it is not expected to be widely used, and DigesterLoader's
156:             * load method is already heavily overloaded.
157:             *
158:             * @param digester is the digester that rules will be added to.
159:             * @param basePath is a path that will be prefixed to every
160:             * pattern string defined in the xmlrules input file.
161:             *
162:             * @see org.apache.commons.digester.RuleSetBase
163:             * @since 1.6
164:             */
165:            public void addRuleInstances(
166:                    org.apache.commons.digester.Digester digester,
167:                    String basePath) throws XmlLoadException {
168:
169:                URL dtdURL = getClass().getClassLoader().getResource(
170:                        DIGESTER_DTD_PATH);
171:                if (dtdURL == null) {
172:                    throw new XmlLoadException("Cannot find resource \""
173:                            + DIGESTER_DTD_PATH + "\"");
174:                }
175:                parser.setDigesterRulesDTD(dtdURL.toString());
176:                parser.setTarget(digester);
177:                parser.setBasePath(basePath);
178:
179:                rulesDigester.addRuleSet(parser);
180:                rulesDigester.push(parser);
181:
182:                rulesLoader.loadRules();
183:            }
184:
185:            /** 
186:             * Worker class encapsulates loading mechanisms.
187:             * Private until some reason is found to make it public.
188:             */
189:            private abstract static class XMLRulesLoader {
190:                /** Load rules now */
191:                public abstract void loadRules() throws XmlLoadException;
192:            }
193:
194:            /** Loads XMLRules from an URL */
195:            private class URLXMLRulesLoader extends XMLRulesLoader {
196:                private URL url;
197:
198:                public URLXMLRulesLoader(URL url) {
199:                    this .url = url;
200:                }
201:
202:                public void loadRules() throws XmlLoadException {
203:                    try {
204:                        rulesDigester.parse(url.openStream());
205:                    } catch (Exception ex) {
206:                        throw new XmlLoadException(ex);
207:                    }
208:                }
209:            }
210:
211:            /** Loads XMLRules from an InputSource */
212:            private class InputSourceXMLRulesLoader extends XMLRulesLoader {
213:                private InputSource inputSource;
214:
215:                public InputSourceXMLRulesLoader(InputSource inputSource) {
216:                    this .inputSource = inputSource;
217:                }
218:
219:                public void loadRules() throws XmlLoadException {
220:                    try {
221:                        rulesDigester.parse(inputSource);
222:                    } catch (Exception ex) {
223:                        throw new XmlLoadException(ex);
224:                    }
225:                }
226:            }
227:        }
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