
org.ow2.bonita.pvm.internal.script.ScriptManager Maven / Gradle / Ivy
/*
* JBoss, Home of Professional Open Source
* Copyright 2005, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.ow2.bonita.pvm.internal.script;
import javax.script.Bindings;
import javax.script.ScriptContext;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
import org.ow2.bonita.pvm.Execution;
import org.ow2.bonita.pvm.PvmException;
import org.ow2.bonita.pvm.env.Environment;
import org.ow2.bonita.pvm.internal.env.ExecutionContext;
import org.ow2.bonita.pvm.internal.env.ExecutionEnvironment;
import org.ow2.bonita.pvm.internal.wire.WireContext;
import org.ow2.bonita.pvm.internal.wire.WireDefinition;
import org.ow2.bonita.pvm.internal.wire.xml.WireParser;
/**
* @author Tom Baeyens
*/
public class ScriptManager {
private static final ScriptManager defaultScriptManager = createDefault();
protected String defaultExpressionLanguage;
protected String defaultScriptLanguage;
protected ScriptEngineManager scriptEngineManager;
protected String[] readContextNames = null;
protected String writeContextName;
public static ScriptManager getScriptManager() {
Environment environment = Environment.getCurrent();
if (environment != null) {
ScriptManager scriptManager = environment.get(ScriptManager.class);
if (scriptManager != null) {
return scriptManager;
}
}
return defaultScriptManager;
}
public static ScriptManager createDefault() {
WireDefinition wireDefinition = (WireDefinition) new WireParser()
.createParse()
.setString(
""
+ " "
+ " "
+ " " + " ").execute()
.getDocumentObject();
WireContext wireContext = new WireContext(wireDefinition);
return wireContext.get(ScriptManager.class);
}
/**
* {@link #evaluate(String, Execution, String) evaluates} the expression with
* the given language or with the defaultExpressionLanguage if the given
* language is null.
*/
public Object evaluateExpression(String expression, Execution execution,
String language) {
return evaluate(expression, execution, (language != null ? language
: defaultExpressionLanguage));
}
/**
* {@link #evaluate(String, Execution, String) evaluates} the script with the
* given language or with the defaultScriptLanguage if the given language is
* null.
*/
public Object evaluateScript(String script, Execution execution,
String language) {
return evaluate(script, execution, (language != null ? language
: defaultScriptLanguage));
}
/**
* evaluates the script with the given language. If script is null, then this
* method will return null.
*
* @throws PvmException
* if language is null.
*/
public Object evaluate(String script, Execution execution, String language) {
if (script == null) {
return null;
}
if (language == null) {
throw new PvmException("no language specified");
}
ScriptEngine scriptEngine = scriptEngineManager.getEngineByName(language);
if (scriptEngine == null) {
throw new PvmException("no scripting engine configured for language "
+ language);
}
if (execution == null) {
return evaluate(scriptEngine, script);
}
Environment environment = Environment.getCurrent();
if (environment == null) {
environment = new ExecutionEnvironment(execution);
try {
return evaluate(scriptEngine, script);
} finally {
environment.close();
}
}
ExecutionContext executionContext = new ExecutionContext(execution);
environment.addContext(executionContext);
try {
return evaluate(scriptEngine, script);
} finally {
environment.removeContext(executionContext);
}
}
protected Object evaluate(ScriptEngine scriptEngine, String script) {
Bindings bindings = new EnvironmentBindings(readContextNames,
writeContextName);
scriptEngine.setBindings(bindings, ScriptContext.ENGINE_SCOPE);
try {
return scriptEngine.eval(script);
} catch (ScriptException e) {
throw new PvmException("script evaluation error: " + e.getMessage(), e);
}
}
}
© 2015 - 2025 Weber Informatics LLC | Privacy Policy