/*
* 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.ScriptBuilder;
import static org.apache.myfaces.extensions.cdi.scripting.impl.util.ExceptionUtils.overrideBuilderState;
import static org.apache.myfaces.extensions.cdi.scripting.impl.util.ScriptingUtils.resolveExternalExpressionInterpreter;
import org.apache.myfaces.extensions.cdi.scripting.impl.spi.ExternalExpressionInterpreter;
import org.apache.myfaces.extensions.cdi.core.api.UnhandledException;
import javax.script.Bindings;
import javax.script.SimpleBindings;
import javax.script.ScriptException;
import javax.script.ScriptEngine;
import java.util.Map;
import java.util.HashMap;
/**
* @author Gerhard Petracek
*/
class DefaultScriptBuilder implements ScriptBuilder
{
private ScriptEngine scriptEngine;
private Map<String, Object> arguments;
private String script;
private Bindings bindings;
DefaultScriptBuilder(ScriptEngine scriptEngine)
{
this.scriptEngine = scriptEngine;
}
/**
* {@inheritDoc}
*/
public ScriptBuilder script(String script)
{
DefaultScriptBuilder newScriptBuilder = new DefaultScriptBuilder(this.scriptEngine);
newScriptBuilder.script = script;
return newScriptBuilder;
}
/**
* {@inheritDoc}
*/
public ScriptBuilder namedArgument(String name, Object value)
{
if(this.bindings != null)
{
throw overrideBuilderState("(named) argument/s");
}
if(this.arguments == null)
{
this.arguments = new HashMap<String, Object>();
}
this.arguments.put(name, value);
return this;
}
/**
* {@inheritDoc}
*/
public ScriptBuilder bindings(Bindings bindings)
{
if(this.arguments != null)
{
throw overrideBuilderState("bindings");
}
this.bindings = bindings;
return this;
}
/**
* {@inheritDoc}
*/
public Object eval()
{
return eval(Object.class);
}
/**
* {@inheritDoc}
*/
public <T> T eval(Class<T> returnType)
{
try
{
this.script = interpreteScript(this.script);
if(this.bindings == null && this.arguments == null)
{
return (T)scriptEngine.eval(this.script);
}
Bindings scriptBindings = this.bindings;
if(scriptBindings == null)
{
scriptBindings = new SimpleBindings(this.arguments);
}
return (T)scriptEngine.eval(this.script, scriptBindings);
}
catch (ScriptException e)
{
throw new UnhandledException(e);
}
}
private String interpreteScript(String script)
{
ExternalExpressionInterpreter externalExpressionInterpreter = resolveExternalExpressionInterpreter();
return externalExpressionInterpreter.transform(script);
}
}