Source Code Cross Referenced for BshScriptFactory.java in  » J2EE » spring-framework-2.0.6 » org » springframework » scripting » bsh » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.0.6 » org.springframework.scripting.bsh 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2002-2007 the original author or authors.
003:         *
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         *
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:
017:        package org.springframework.scripting.bsh;
018:
019:        import java.io.IOException;
020:
021:        import bsh.EvalError;
022:
023:        import org.springframework.beans.factory.BeanClassLoaderAware;
024:        import org.springframework.scripting.ScriptCompilationException;
025:        import org.springframework.scripting.ScriptFactory;
026:        import org.springframework.scripting.ScriptSource;
027:        import org.springframework.util.Assert;
028:        import org.springframework.util.ClassUtils;
029:
030:        /**
031:         * {@link org.springframework.scripting.ScriptFactory} implementation
032:         * for a BeanShell script.
033:         *
034:         * <p>Typically used in combination with a
035:         * {@link org.springframework.scripting.support.ScriptFactoryPostProcessor};
036:         * see the latter's javadoc for a configuration example.
037:         *
038:         * @author Juergen Hoeller
039:         * @author Rob Harrop
040:         * @since 2.0
041:         * @see BshScriptUtils
042:         * @see org.springframework.scripting.support.ScriptFactoryPostProcessor
043:         */
044:        public class BshScriptFactory implements  ScriptFactory,
045:                BeanClassLoaderAware {
046:
047:            private final String scriptSourceLocator;
048:
049:            private final Class[] scriptInterfaces;
050:
051:            private ClassLoader beanClassLoader = ClassUtils
052:                    .getDefaultClassLoader();
053:
054:            private Class scriptClass;
055:
056:            private final Object scriptClassMonitor = new Object();
057:
058:            /**
059:             * Create a new BshScriptFactory for the given script source.
060:             * <p>With this <code>BshScriptFactory</code> variant, the script needs to
061:             * declare a full class or return an actual instance of the scripted object.
062:             * @param scriptSourceLocator a locator that points to the source of the script.
063:             * Interpreted by the post-processor that actually creates the script.
064:             */
065:            public BshScriptFactory(String scriptSourceLocator) {
066:                this (scriptSourceLocator, null);
067:            }
068:
069:            /**
070:             * Create a new BshScriptFactory for the given script source.
071:             * <p>The script may either be a simple script that needs a corresponding proxy
072:             * generated (implementing the specified interfaces), or declare a full class
073:             * or return an actual instance of the scripted object (in which case the
074:             * specified interfaces, if any, need to be implemented by that class/instance).
075:             * @param scriptSourceLocator a locator that points to the source of the script.
076:             * Interpreted by the post-processor that actually creates the script.
077:             * @param scriptInterfaces the Java interfaces that the scripted object
078:             * is supposed to implement (may be <code>null</code>)
079:             */
080:            public BshScriptFactory(String scriptSourceLocator,
081:                    Class[] scriptInterfaces) {
082:                Assert.hasText(scriptSourceLocator,
083:                        "'scriptSourceLocator' must not be empty");
084:                this .scriptSourceLocator = scriptSourceLocator;
085:                this .scriptInterfaces = scriptInterfaces;
086:            }
087:
088:            public void setBeanClassLoader(ClassLoader classLoader) {
089:                this .beanClassLoader = classLoader;
090:            }
091:
092:            public String getScriptSourceLocator() {
093:                return this .scriptSourceLocator;
094:            }
095:
096:            public Class[] getScriptInterfaces() {
097:                return this .scriptInterfaces;
098:            }
099:
100:            /**
101:             * BeanShell scripts do require a config interface.
102:             */
103:            public boolean requiresConfigInterface() {
104:                return true;
105:            }
106:
107:            /**
108:             * Load and parse the BeanShell script via {@link BshScriptUtils}.
109:             * @see BshScriptUtils#createBshObject(String, Class[], ClassLoader)
110:             */
111:            public Object getScriptedObject(ScriptSource actualScriptSource,
112:                    Class[] actualInterfaces) throws IOException,
113:                    ScriptCompilationException {
114:
115:                try {
116:                    Class clazz = null;
117:                    synchronized (this .scriptClassMonitor) {
118:                        if (actualScriptSource.isModified()) {
119:                            // New script content: Let's check whether it evaluates to a Class.
120:                            Object result = BshScriptUtils.evaluateBshScript(
121:                                    actualScriptSource.getScriptAsString(),
122:                                    actualInterfaces, this .beanClassLoader);
123:                            if (result instanceof  Class) {
124:                                // A Class: We'll cache the Class here and create an instance
125:                                // outside of the synchronized block.
126:                                this .scriptClass = (Class) result;
127:                            } else {
128:                                // Not a Class: OK, we'll simply create BeanShell objects
129:                                // through evaluating the script for every call later on.
130:                                // For this first-time check, let's simply return the
131:                                // already evaluated object.
132:                                return result;
133:                            }
134:                        }
135:                        clazz = this .scriptClass;
136:                    }
137:                    if (clazz != null) {
138:                        // A Class: We need to create an instance for every call.
139:                        try {
140:                            return clazz.newInstance();
141:                        } catch (Throwable ex) {
142:                            throw new ScriptCompilationException(
143:                                    "Could not instantiate script class: "
144:                                            + clazz, ex);
145:                        }
146:                    } else {
147:                        // Not a Class: We need to evaluate the script for every call.
148:                        return BshScriptUtils.createBshObject(
149:                                actualScriptSource.getScriptAsString(),
150:                                actualInterfaces, this .beanClassLoader);
151:                    }
152:                } catch (EvalError ex) {
153:                    throw new ScriptCompilationException(
154:                            "Could not compile BeanShell script: "
155:                                    + actualScriptSource, ex);
156:                }
157:            }
158:
159:            public Class getScriptedObjectType(ScriptSource scriptSource)
160:                    throws IOException, ScriptCompilationException {
161:
162:                try {
163:                    synchronized (this .scriptClassMonitor) {
164:                        if (scriptSource.isModified()) {
165:                            // New script content: Let's check whether it evaluates to a Class.
166:                            this .scriptClass = BshScriptUtils
167:                                    .determineBshObjectType(scriptSource
168:                                            .getScriptAsString());
169:                        }
170:                        return this .scriptClass;
171:                    }
172:                } catch (EvalError ex) {
173:                    throw new ScriptCompilationException(
174:                            "Could not compile BeanShell script: "
175:                                    + scriptSource, ex);
176:                }
177:            }
178:
179:            public String toString() {
180:                return "BshScriptFactory: script source locator ["
181:                        + this .scriptSourceLocator + "]";
182:            }
183:
184:        }
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