/* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.camunda.bpm.engine.impl.scripting;
import javax.script.Bindings;
import javax.script.ScriptEngine;
import javax.script.ScriptException;
import org.camunda.bpm.engine.ScriptEvaluationException;
import org.camunda.bpm.engine.delegate.Expression;
import org.camunda.bpm.engine.delegate.VariableScope;
/**
* A script which is dynamically determined during the execution.
* Therefore it has to be executed in the context of an atomic operation.
*
* @author Sebastian Menski
*/
public abstract class DynamicExecutableScript extends ExecutableScript {
protected final Expression scriptExpression;
protected DynamicExecutableScript(Expression scriptExpression, String language) {
super(language);
this.scriptExpression = scriptExpression;
}
public Object execute(ScriptEngine scriptEngine, VariableScope variableScope, Bindings bindings) {
String source = getScriptSource(variableScope);
try {
return scriptEngine.eval(source, bindings);
}
catch (ScriptException e) {
throw new ScriptEvaluationException("Unable to evaluate script: " + e.getMessage(), e);
}
}
protected String evaluateExpression(VariableScope variableScope) {
return (String) scriptExpression.getValue(variableScope);
}
public abstract String getScriptSource(VariableScope variableScope);
}