/*
* 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.jst;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import javax.jcr.RepositoryException;
import javax.script.Bindings;
import javax.script.ScriptContext;
import javax.script.ScriptEngineFactory;
import javax.script.ScriptException;
import org.apache.sling.api.scripting.SlingBindings;
import org.apache.sling.api.scripting.SlingScriptHelper;
import org.apache.sling.commons.json.JSONException;
import org.apache.sling.scripting.api.AbstractSlingScriptEngine;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/** JST script engine.
* This engine does not really execute the supplied script: it dumps a default
* HTML representation of the current Resource, which includes a reference
* to the script path with a .jst.js selector and extension, so that the
* {@link JsCodeGeneratorServlet} can provide the template-specific client
* javascript code.
*/
public class JstScriptEngine extends AbstractSlingScriptEngine {
private final HtmlCodeGenerator htmlGenerator;
private final Logger log = LoggerFactory.getLogger(getClass());
JstScriptEngine(ScriptEngineFactory scriptEngineFactory) {
super(scriptEngineFactory);
htmlGenerator = new HtmlCodeGenerator();
}
/** Output the HTML representation, with reference to the actual client-side script */
public Object eval(Reader script, ScriptContext context) throws ScriptException {
final Bindings props = context.getBindings(ScriptContext.ENGINE_SCOPE);
final SlingScriptHelper helper = (SlingScriptHelper) props.get(SlingBindings.SLING);
final InputStream scriptStream = helper.getScript().getScriptResource().adaptTo(InputStream.class);
try {
htmlGenerator.generateHtml(helper.getRequest(),
helper.getScript().getScriptResource().getPath(), scriptStream,
helper.getResponse().getWriter());
} catch (IOException ioe) {
throw new ScriptException(ioe);
} catch(RepositoryException re) {
throw new ScriptException(re);
} catch(JSONException je) {
throw new ScriptException(je);
} finally {
if(scriptStream != null) {
try {
scriptStream.close();
} catch(IOException ioe) {
log.warn("IOException while closing scriptStream",ioe);
}
}
}
return null;
}
}