/*
* 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.xproc;
import java.io.Reader;
import javax.script.Bindings;
import javax.script.ScriptContext;
import javax.script.ScriptEngine;
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.scripting.api.AbstractSlingScriptEngine;
import org.apache.sling.scripting.xproc.xpl.XplBuilder;
import org.apache.sling.scripting.xproc.xpl.api.Pipeline;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A {@link ScriptEngine} that uses XPL definition files
* in order to execute pipelines over Sling resources.
*
* @see http://www.w3.org/TR/xproc/
*/
public class XProcScriptEngine extends AbstractSlingScriptEngine {
private static final Logger log = LoggerFactory.getLogger(XProcScriptEngine.class);
protected XProcScriptEngine(ScriptEngineFactory factory) {
super(factory);
}
public Object eval(Reader reader, ScriptContext scriptContext) throws ScriptException {
Bindings bindings = scriptContext.getBindings(ScriptContext.ENGINE_SCOPE);
SlingScriptHelper helper = (SlingScriptHelper) bindings.get(SlingBindings.SLING);
if (helper == null) {
throw new ScriptException("SlingScriptHelper missing from bindings");
}
String scriptName = helper.getScript().getScriptResource().getPath();
try {
XplBuilder xplBuilder = new XplBuilder();
Pipeline xpl = (Pipeline) xplBuilder.build(reader);
xpl.getEnv().setSling(helper);
xpl.eval();
} catch (Throwable t) {
log.error("Failure running XProc script.", t);
final ScriptException se = new ScriptException("Failure running XProc script " + scriptName);
se.initCause(t);
throw se;
}
return null;
}
}