| /******************************************************************************* |
| * 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.sightly.impl.engine; |
| |
| import java.io.Reader; |
| import java.io.StringReader; |
| |
| import javax.script.Compilable; |
| import javax.script.CompiledScript; |
| import javax.script.ScriptContext; |
| import javax.script.ScriptException; |
| |
| import org.apache.sling.scripting.api.AbstractSlingScriptEngine; |
| import org.apache.sling.scripting.sightly.impl.engine.precompiled.PrecompiledUnitManager; |
| import org.apache.sling.scripting.sightly.impl.engine.compiled.SlingHTLMasterCompiler; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * The HTL Script engine |
| */ |
| public class SightlyScriptEngine extends AbstractSlingScriptEngine implements Compilable { |
| |
| private static final Logger LOGGER = LoggerFactory.getLogger(SightlyScriptEngine.class); |
| |
| private SlingHTLMasterCompiler slingHTLMasterCompiler; |
| private PrecompiledUnitManager precompiledUnitManager; |
| private ExtensionRegistryService extensionRegistryService; |
| |
| SightlyScriptEngine(SightlyScriptEngineFactory factory, ExtensionRegistryService extensionRegistryService, |
| SlingHTLMasterCompiler slingHTLMasterCompiler, PrecompiledUnitManager precompiledUnitManager) { |
| super(factory); |
| this.extensionRegistryService = extensionRegistryService; |
| this.slingHTLMasterCompiler = slingHTLMasterCompiler; |
| this.precompiledUnitManager = precompiledUnitManager; |
| } |
| |
| @Override |
| public CompiledScript compile(String script) throws ScriptException { |
| return compile(new StringReader(script)); |
| } |
| |
| @Override |
| public CompiledScript compile(final Reader script) throws ScriptException { |
| if (slingHTLMasterCompiler != null) { |
| return slingHTLMasterCompiler.compileHTLScript(this, script, null); |
| } |
| throw new ScriptException("Missing compilation support."); |
| } |
| |
| @Override |
| public Object eval(Reader reader, ScriptContext scriptContext) throws ScriptException { |
| checkArguments(reader, scriptContext); |
| try { |
| SightlyCompiledScript compiledScript = null; |
| if (precompiledUnitManager != null) { |
| compiledScript = precompiledUnitManager.getSightlyCompiledScript(this, scriptContext); |
| } else if (slingHTLMasterCompiler != null) { |
| compiledScript = slingHTLMasterCompiler.compileHTLScript(this, reader, scriptContext); |
| } |
| if (compiledScript != null) { |
| return compiledScript.eval(scriptContext); |
| } |
| } catch (Exception e) { |
| throw new ScriptException(e); |
| } |
| LOGGER.warn("Did not find a compilable or executable unit."); |
| return null; |
| } |
| |
| public ExtensionRegistryService getExtensionRegistryService() { |
| return extensionRegistryService; |
| } |
| |
| private void checkArguments(Reader reader, ScriptContext scriptContext) { |
| if (reader == null) { |
| throw new NullPointerException("Reader cannot be null"); |
| } |
| if (scriptContext == null) { |
| throw new NullPointerException("ScriptContext cannot be null"); |
| } |
| } |
| |
| |
| } |