| /* |
| * 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.camel.language.groovy; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.Set; |
| |
| import groovy.lang.Binding; |
| import groovy.lang.GroovyShell; |
| import groovy.lang.Script; |
| import org.apache.camel.Exchange; |
| import org.apache.camel.RuntimeCamelException; |
| import org.apache.camel.support.ExchangeHelper; |
| import org.apache.camel.support.ExpressionSupport; |
| |
| public class GroovyExpression extends ExpressionSupport { |
| private final String text; |
| |
| public GroovyExpression(String text) { |
| this.text = text; |
| } |
| |
| @Override |
| public String toString() { |
| return "groovy: " + text; |
| } |
| |
| protected String assertionFailureMessage(Exchange exchange) { |
| return "groovy: " + text; |
| } |
| |
| public <T> T evaluate(Exchange exchange, Class<T> type) { |
| Script script = instantiateScript(exchange); |
| script.setBinding(createBinding(exchange)); |
| Object value = script.run(); |
| |
| return exchange.getContext().getTypeConverter().convertTo(type, value); |
| } |
| |
| @SuppressWarnings("unchecked") |
| private Script instantiateScript(Exchange exchange) { |
| // Get the script from the cache, or create a new instance |
| GroovyLanguage language = (GroovyLanguage) exchange.getContext().resolveLanguage("groovy"); |
| Class<Script> scriptClass = language.getScriptFromCache(text); |
| if (scriptClass == null) { |
| GroovyShell shell; |
| Set<GroovyShellFactory> shellFactories = exchange.getContext().getRegistry().findByType(GroovyShellFactory.class); |
| if (shellFactories.size() > 1) { |
| throw new IllegalStateException("Too many GroovyShellFactory instances found: " + shellFactories.size()); |
| } else if (shellFactories.size() == 1) { |
| shell = shellFactories.iterator().next().createGroovyShell(exchange); |
| } else { |
| ClassLoader cl = exchange.getContext().getApplicationContextClassLoader(); |
| shell = cl != null ? new GroovyShell(cl) : new GroovyShell(); |
| } |
| scriptClass = shell.getClassLoader().parseClass(text); |
| language.addScriptToCache(text, scriptClass); |
| } |
| |
| // New instance of the script |
| try { |
| return scriptClass.newInstance(); |
| } catch (InstantiationException e) { |
| throw new RuntimeCamelException(e); |
| } catch (IllegalAccessException e) { |
| throw new RuntimeCamelException(e); |
| } |
| } |
| |
| private Binding createBinding(Exchange exchange) { |
| Map<String, Object> variables = new HashMap<>(); |
| ExchangeHelper.populateVariableMap(exchange, variables); |
| return new Binding(variables); |
| } |
| } |