| /* |
| * 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; |
| } |
| |
| } |