/**
* 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 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.ExpressionSupport;
import org.apache.camel.util.ExchangeHelper;
/**
* @version
*/
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) {
ClassLoader cl = exchange.getContext().getApplicationContextClassLoader();
GroovyShell 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<String, Object>();
ExchangeHelper.populateVariableMap(exchange, variables);
return new Binding(variables);
}
}