/*
* 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.sling.scripting.groovy.scripting.internal;
import groovy.lang.Writable;
import groovy.text.GStringTemplateEngine;
import groovy.text.Template;
import groovy.text.TemplateEngine;
import java.io.IOException;
import java.io.Reader;
import javax.script.Bindings;
import javax.script.ScriptContext;
import javax.script.ScriptEngineFactory;
import javax.script.ScriptException;
import org.apache.sling.scripting.api.AbstractSlingScriptEngine;
/**
* The actual GSP Script Engine, which simply wraps Groovy's
*/
public class GSPScriptEngine extends AbstractSlingScriptEngine {
private TemplateEngine templateEngine;
public GSPScriptEngine(ScriptEngineFactory scriptEngineFactory, ClassLoader classLoader) {
super(scriptEngineFactory);
this.templateEngine = new GStringTemplateEngine(classLoader);
}
public Object eval(Reader reader, ScriptContext ctx) throws ScriptException {
Template template = null;
try {
template = templateEngine.createTemplate(reader);
} catch (IOException e) {
throw new ScriptException("Unable to compile GSP script: " + e.getMessage());
} catch (ClassNotFoundException e) {
throw new ScriptException("Unable to compile GSP script: " + e.getMessage());
}
Bindings bindings = ctx.getBindings(ScriptContext.ENGINE_SCOPE);
Writable result = template.make(bindings);
try {
result.writeTo(ctx.getWriter());
} catch (IOException e) {
throw new ScriptException("Unable to write result of script execution: " + e.getMessage());
}
return null;
}
}