/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.myfaces.extensions.cdi.scripting.impl;
import org.apache.myfaces.extensions.cdi.scripting.api.ScriptExecutor;
import org.apache.myfaces.extensions.cdi.scripting.api.language.Language;
import org.apache.myfaces.extensions.cdi.scripting.impl.spi.ExternalExpressionInterpreter;
import static org.apache.myfaces.extensions.cdi.scripting.impl.util.ScriptingUtils.resolveExternalExpressionInterpreter;
import org.apache.myfaces.extensions.cdi.core.api.UnhandledException;
import org.apache.myfaces.extensions.cdi.scripting.impl.util.ScriptingUtils;
import javax.enterprise.inject.Typed;
import javax.script.Bindings;
import javax.script.ScriptException;
import javax.script.SimpleBindings;
import javax.script.ScriptEngine;
import java.util.Map;
/**
* @author Gerhard Petracek
*/
@Typed()
class DefaultScriptExecutor implements ScriptExecutor
{
private static final long serialVersionUID = 1340953486786561148L;
private transient ScriptEngine scriptEngine;
private Class<? extends Language> language;
/**
* Constructor which creates the executor which is awae of the current script-engine
* @param scriptEngine script-engine which should be used
* @param language current language
*/
DefaultScriptExecutor(ScriptEngine scriptEngine, Class<? extends Language> language)
{
this.scriptEngine = scriptEngine;
this.language = language;
}
/**
* {@inheritDoc}
*/
public Object eval(String script)
{
return eval(script, Object.class);
}
/**
* {@inheritDoc}
*/
public Object eval(String script, Map<String, Object> arguments)
{
return eval(script, arguments, Object.class);
}
/**
* {@inheritDoc}
*/
public Object eval(String script, Bindings bindings)
{
return eval(script, bindings, Object.class);
}
/**
* {@inheritDoc}
*/
public <T> T eval(String script, Class<T> returnType)
{
try
{
script = interpreteScript(script);
//noinspection unchecked
return (T)getScriptEngine().eval(script);
}
catch (ScriptException e)
{
throw new UnhandledException(e);
}
}
private ScriptEngine getScriptEngine()
{
if(this.scriptEngine == null)
{
this.scriptEngine = ScriptingUtils.createScriptEngine(this.language);
}
return this.scriptEngine;
}
/**
* {@inheritDoc}
*/
public <T> T eval(String script, Map<String, Object> arguments, Class<T> returnType)
{
return eval(script, new SimpleBindings(arguments), returnType);
}
/**
* {@inheritDoc}
*/
public <T> T eval(String script, Bindings bindings, Class<T> returnType)
{
try
{
script = interpreteScript(script);
//noinspection unchecked
return (T)getScriptEngine().eval(script, bindings);
}
catch (ScriptException e)
{
throw new UnhandledException(e);
}
}
private String interpreteScript(String script)
{
ExternalExpressionInterpreter externalExpressionInterpreter = resolveExternalExpressionInterpreter();
return externalExpressionInterpreter.transform(script);
}
}