Source Code Cross Referenced for CompiledProgrammingLanguage.java in  » Content-Management-System » apache-lenya-2.0 » org » apache » cocoon » components » language » programming » 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.language.programming 
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.language.programming;
018:
019:        import org.apache.avalon.framework.context.Context;
020:        import org.apache.avalon.framework.context.ContextException;
021:        import org.apache.avalon.framework.context.Contextualizable;
022:        import org.apache.avalon.framework.parameters.Parameters;
023:        import org.apache.avalon.framework.parameters.ParameterException;
024:
025:        import org.apache.cocoon.Constants;
026:        import org.apache.cocoon.components.language.LanguageException;
027:        import org.apache.cocoon.components.language.programming.java.JavaProgram;
028:        import org.apache.cocoon.util.ClassUtils;
029:        import org.apache.cocoon.util.IOUtils;
030:
031:        import java.io.File;
032:
033:        /**
034:         * A compiled programming language. This class extends <code>AbstractProgrammingLanguage</code> adding support for compilation
035:         * and object program files
036:         * @author <a href="mailto:ricardo@apache.org">Ricardo Rocha</a>
037:         * @version CVS $Id: CompiledProgrammingLanguage.java 433543 2006-08-22 06:22:54Z crossley $
038:         */
039:        public abstract class CompiledProgrammingLanguage extends
040:                AbstractProgrammingLanguage implements  Contextualizable {
041:
042:            /** The compiler */
043:            protected Class compilerClass;
044:
045:            /** The local classpath */
046:            protected String classpath;
047:
048:            /** The source deletion option */
049:            protected boolean deleteSources = false;
050:
051:            /**
052:             * Set the configuration parameters. This method instantiates the sitemap-specified language compiler
053:             * @param params The configuration parameters
054:             * @exception ParameterException If the language compiler cannot be loaded
055:             */
056:            public void parameterize(Parameters params)
057:                    throws ParameterException {
058:                super .parameterize(params);
059:
060:                String compilerClass = params.getParameter("compiler");
061:                try {
062:                    this .compilerClass = ClassUtils.loadClass(compilerClass);
063:                } catch (ClassNotFoundException e) {
064:                    throw new ParameterException("Unable to load compiler: "
065:                            + compilerClass, e);
066:                }
067:                this .deleteSources = params.getParameterAsBoolean(
068:                        "delete-sources", false);
069:            }
070:
071:            /**
072:             * Set the context
073:             * @param context The context
074:             */
075:            public void contextualize(Context context) throws ContextException {
076:                this .classpath = (String) context
077:                        .get(Constants.CONTEXT_CLASSPATH);
078:            }
079:
080:            /**
081:             * Return the language's canonical object file extension.
082:             * @return The object file extension
083:             */
084:            public abstract String getObjectExtension();
085:
086:            /**
087:             * Unload a previously loaded program
088:             * @param program A previously loaded object program
089:             * @exception LanguageException If an error occurs during unloading
090:             */
091:            public abstract void doUnload(Object program)
092:                    throws LanguageException;
093:
094:            /**
095:             * Unload a previously loaded program given its original filesystem location
096:             * @param program The previously loaded object program
097:             * @param filename The base filename of the object program
098:             * @param baseDirectory The directory contaning the object program file
099:             * @exception LanguageException If an error occurs
100:             */
101:            protected final void doUnload(Object program, String filename,
102:                    File baseDirectory) throws LanguageException {
103:                int index = filename.lastIndexOf(File.separator);
104:                String dir = filename.substring(0, index);
105:                String file = filename.substring(index + 1);
106:
107:                File baseDir = new File(baseDirectory, dir);
108:                File[] files = baseDir.listFiles();
109:
110:                for (int i = 0; (files != null) && (i < files.length); i++) {
111:                    if (files[i].getName().startsWith(file)) {
112:                        files[i].delete();
113:                    }
114:                }
115:                this .doUnload(program);
116:            }
117:
118:            /**
119:             * Actually load an object program from a file.
120:             * @param filename The object program base file name
121:             * @param baseDirectory The directory containing the object program file
122:             * @return The loaded object program
123:             * @exception LanguageException If an error occurs during loading
124:             */
125:            protected abstract Class loadProgram(String filename,
126:                    File baseDirectory) throws LanguageException;
127:
128:            /**
129:             * Compile a source file yielding a loadable object file.
130:             * @param filename The object program base file name
131:             * @param baseDirectory The directory containing the object program file
132:             * @param encoding The encoding expected in the source file or <code>null</code> if it is the platform's default encoding
133:             * @exception LanguageException If an error occurs during compilation
134:             */
135:            protected abstract void compile(String filename,
136:                    File baseDirectory, String encoding)
137:                    throws LanguageException;
138:
139:            /**
140:             * Preload an object program from a file.
141:             * This method does not compiles the corresponding source file.
142:             *
143:             * @param filename The object program base file name
144:             * @param baseDirectory The directory containing the object program file
145:             * @param encoding The encoding expected in the source file or <code>null</code> if it is the platform's default encoding
146:             * @return The loaded object program
147:             * @exception LanguageException If an error occurs during compilation
148:             */
149:            public Program preload(String filename, File baseDirectory,
150:                    String encoding) throws LanguageException {
151:                // Don't need to test for existence of the object code as it might be bundled into the WAR.
152:                try {
153:                    Class program = this .loadProgram(filename, baseDirectory);
154:                    // Create and discard test instance.
155:                    program.newInstance();
156:                    return new JavaProgram(program);
157:                } catch (Throwable t) {
158:                    throw new LanguageException("Unable to preload program "
159:                            + filename, t);
160:                }
161:            }
162:
163:            /**
164:             * Load an object program from a file.
165:             * This method compiles the corresponding source file if necessary.
166:             *
167:             * @param filename The object program base file name
168:             * @param baseDirectory The directory containing the object program file
169:             * @param encoding The encoding expected in the source file or <code>null</code> if it is the platform's default encoding
170:             * @return The loaded object program
171:             * @exception LanguageException If an error occurs during compilation
172:             */
173:            public Program load(String filename, File baseDirectory,
174:                    String encoding) throws LanguageException {
175:
176:                // Does source file exist?
177:                File sourceFile = new File(baseDirectory, filename + "."
178:                        + this .getSourceExtension());
179:                if (!sourceFile.exists()) {
180:                    throw new LanguageException(
181:                            "Can't load program - File doesn't exist: "
182:                                    + IOUtils.getFullFilename(sourceFile));
183:                }
184:                if (!sourceFile.isFile()) {
185:                    throw new LanguageException(
186:                            "Can't load program - File is not a normal file: "
187:                                    + IOUtils.getFullFilename(sourceFile));
188:                }
189:                if (!sourceFile.canRead()) {
190:                    throw new LanguageException(
191:                            "Can't load program - File cannot be read: "
192:                                    + IOUtils.getFullFilename(sourceFile));
193:                }
194:                this .compile(filename, baseDirectory, encoding);
195:                if (this .deleteSources) {
196:                    sourceFile.delete();
197:                }
198:                Class program = this .loadProgram(filename, baseDirectory);
199:
200:                // Try to instantiate once to ensure there are no exceptions thrown in the constructor
201:                try {
202:                    // Create and discard test instance
203:                    program.newInstance();
204:                } catch (IllegalAccessException iae) {
205:                    getLogger().debug(
206:                            "No public constructor for class "
207:                                    + program.getName());
208:                } catch (Exception e) {
209:                    // Unload class and delete the object file, or it won't be recompiled
210:                    // (leave the source file to allow examination).
211:                    this .doUnload(program);
212:                    new File(baseDirectory, filename + "."
213:                            + this .getObjectExtension()).delete();
214:
215:                    String message = "Error while instantiating " + filename;
216:                    getLogger().debug(message, e);
217:                    throw new LanguageException(message, e);
218:                }
219:
220:                if (program == null) {
221:                    throw new LanguageException("Can't load program : "
222:                            + baseDirectory.toString() + File.separator
223:                            + filename);
224:                }
225:
226:                return new JavaProgram(program);
227:            }
228:        }
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