Source Code Cross Referenced for ValidationResolver.java in  » Content-Management-System » apache-lenya-2.0 » org » apache » cocoon » components » validation » impl » 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.validation.impl 
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.validation.impl;
018:
019:        import java.io.IOException;
020:        import java.util.ArrayList;
021:        import java.util.Iterator;
022:        import java.util.List;
023:
024:        import org.apache.excalibur.source.Source;
025:        import org.apache.excalibur.source.SourceResolver;
026:        import org.apache.excalibur.source.SourceValidity;
027:        import org.apache.excalibur.source.impl.validity.AggregatedValidity;
028:        import org.xml.sax.EntityResolver;
029:        import org.xml.sax.InputSource;
030:        import org.xml.sax.SAXException;
031:
032:        /**
033:         * <p>An internal {@link InputSource} resolver that can be used while parsing
034:         * schemas.</p>
035:         *
036:         * <p>This instance will track all resolved external sources and will store their
037:         * validity information. An aggregated {@link SourceValidity} for all resolved
038:         * sources can be retrieved when {@link #close() closing} this instance.</p>
039:         *
040:         */
041:        public class ValidationResolver implements  EntityResolver {
042:
043:            /** <p>The {@link SourceResolver} to access {@link Source}s.</p> */
044:            private final SourceResolver sourceResolver;
045:            /** <p>The {@link EntityResolver} to resolve public IDs against catalogs.</p> */
046:            private final EntityResolver entityResolver;
047:            /** <p>The global {@link SourceValidity} of all resolved sources.</p> */
048:            private final AggregatedValidity sourceValidity;
049:
050:            /** <p>A {@link List} of {@link Source} to be released when closing.</p> */
051:            private final List sources = new ArrayList();
052:
053:            /** <p>A flag indicating whether this instance has been closed.</p> */
054:            private boolean closed = false;
055:
056:            /**
057:             * <p>Create a new {@link ValidationResolver} instance.</p>
058:             * 
059:             * @throws NullPointerException if one of the specified {@link SourceResolver}
060:             *                              or {@link EntityResolver} was <b>null</b>. 
061:             */
062:            public ValidationResolver(SourceResolver sourceResolver,
063:                    EntityResolver entityResolver) {
064:                if (sourceResolver == null)
065:                    throw new NullPointerException("Null source");
066:                if (entityResolver == null)
067:                    throw new NullPointerException("Null entity");
068:                this .sourceValidity = new AggregatedValidity();
069:                this .sourceResolver = sourceResolver;
070:                this .entityResolver = entityResolver;
071:            }
072:
073:            /**
074:             * <p>Resolve a {@link Source} into an {@link InputSource}.</p>
075:             */
076:            public InputSource resolveSource(Source source) throws IOException,
077:                    SAXException {
078:                return this .resolveSource(source, null, null);
079:            }
080:
081:            /**
082:             * <p>Resolve a {@link Source} into an {@link InputSource}, specifying a
083:             * specific system identifier.</p>
084:             */
085:            public InputSource resolveSource(Source source, String systemId)
086:                    throws IOException, SAXException {
087:                return this .resolveSource(source, systemId, null);
088:            }
089:
090:            /**
091:             * <p>Resolve a {@link Source} into an {@link InputSource}, specifying both
092:             * a specific system identifier and a public identifier.</p>
093:             * 
094:             * <p>If the specified system identifier was <b>null</b> the returned
095:             * {@link InputSource}'s {@link InputSource#getSystemId() system identifier}
096:             * will be obtained calling the {@link Source#getURI()} method.</p>
097:             */
098:            public InputSource resolveSource(Source source, String systemId,
099:                    String publicId) throws IOException, SAXException {
100:                if (this .closed)
101:                    throw new IllegalStateException("Resolver closed");
102:
103:                /* Validate what we've been passed */
104:                if (source == null)
105:                    throw new NullPointerException("Null source specified");
106:
107:                /* Record the current source in the validities to return */
108:                this .sourceValidity.add(source.getValidity());
109:
110:                /* Ensure that we have a proper system id */
111:                if (systemId == null)
112:                    systemId = source.getURI();
113:
114:                /* Create a new input source and return it filled out entirely */
115:                InputSource input = new InputSource(systemId);
116:                input.setByteStream(source.getInputStream());
117:                if (publicId != null)
118:                    input.setPublicId(publicId);
119:                return input;
120:            }
121:
122:            /**
123:             * <p>Resolve an entity identified by a specific system identifier as an
124:             * {@link InputSource}.</p>
125:             */
126:            public InputSource resolveEntity(String systemId)
127:                    throws IOException, SAXException {
128:                return this .resolveEntity(null, null, systemId);
129:            }
130:
131:            /**
132:             * <p>Resolve an entity identified by a specific system and public identifier
133:             * as an {@link InputSource}.</p>
134:             */
135:            public InputSource resolveEntity(String publicId, String systemId)
136:                    throws IOException, SAXException {
137:                return this .resolveEntity(null, publicId, systemId);
138:            }
139:
140:            /**
141:             * <p>Resolve an entity identified by a specific system and public identifier
142:             * and relative to a specified base location as an {@link InputSource}.</p>
143:             */
144:            public InputSource resolveEntity(String base, String publicId,
145:                    String systemId) throws IOException, SAXException {
146:                if (this .closed)
147:                    throw new IllegalStateException("Resolver closed");
148:
149:                /* If the specified system id was null use the global entity resolver */
150:                if (systemId == null) {
151:                    InputSource source = this .entityResolver.resolveEntity(
152:                            publicId, null);
153:                    if ((source == null) || (source.getSystemId() == null)) {
154:                        throw new IOException("Can't resolve \"" + publicId
155:                                + "\"");
156:                    }
157:                    systemId = source.getSystemId();
158:                }
159:
160:                /* Now that we have a valid system id, attempt to resolve it as a source */
161:                final Source source;
162:                if (base == null) {
163:                    source = this .sourceResolver.resolveURI(systemId);
164:                } else {
165:                    source = this .sourceResolver.resolveURI(systemId, base,
166:                            null);
167:                }
168:
169:                /* Record this source as a source to release back to the resolver */
170:                this .sources.add(source);
171:
172:                /* Return the resolved input source back to the caller */
173:                return this .resolveSource(source, systemId, publicId);
174:            }
175:
176:            /**
177:             * <p>Close this {@link ValidationResolver} instance, releasing all created
178:             * {@link Source}s back to the {@link SourceResolver} and returning an
179:             * aggregated {@link SourceValidity}.</p>
180:             */
181:            public SourceValidity close() {
182:
183:                /* Release all the sources that were opened using this source resolver */
184:                Iterator iterator = this .sources.iterator();
185:                while (iterator.hasNext()) {
186:                    this .sourceResolver.release((Source) iterator.next());
187:                }
188:
189:                /* Mark this instance as closed */
190:                this .closed = true;
191:
192:                /* Return the source validity associated with this instance */
193:                return this .sourceValidity;
194:            }
195:
196:            /**
197:             * <p>Ensure that when this object is garbage collected, the {@link #close()}
198:             * method is executed.</p>
199:             */
200:            protected void finalize() throws Throwable {
201:                try {
202:                    super.finalize();
203:                } finally {
204:                    if (this.closed)
205:                        return;
206:                    this.close();
207:                }
208:            }
209:        }
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