| /** |
| * 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.simple; |
| |
| import org.apache.camel.Expression; |
| import org.apache.camel.ExpressionIllegalSyntaxException; |
| import org.apache.camel.builder.ExpressionBuilder; |
| import org.apache.camel.util.ObjectHelper; |
| |
| /** |
| * A <a href="http://camel.apache.org/simple.html">simple language</a> |
| * which maps simple property style notations to access headers and bodies. |
| * Examples of supported expressions are: |
| * <ul> |
| * <li>id to access the inbound message id</li> |
| * <li>in.body or body to access the inbound body</li> |
| * <li>out.body to access the inbound body</li> |
| * <li>in.header.foo or header.foo to access an inbound header called 'foo'</li> |
| * <li>out.header.foo to access an outbound header called 'foo'</li> |
| * <li>property.foo to access the exchange property called 'foo'</li> |
| * <li>sys.foo to access the system property called 'foo'</li> |
| * <li>exception.messsage to access the exception message</li> |
| * <li>date:<command>:<pattern> for date formatting using the {@link java.text.SimpleDateFormat} patterns. |
| * Supported commands are: <tt>now</tt> for current timestamp, |
| * <tt>in.header.xxx</tt> or <tt>header.xxx</tt> to use the Date object in the in header. |
| * <tt>out.header.xxx</tt> to use the Date object in the out header. |
| * </li> |
| * <li>bean:<bean expression> to invoke a bean using the |
| * {@link org.apache.camel.language.bean.BeanLanguage BeanLanguage}</li> |
| * </ul> |
| * |
| * @version $Revision$ |
| */ |
| public class SimpleLanguage extends SimpleLanguageSupport { |
| |
| public static Expression simple(String expression) { |
| SimpleLanguage language = new SimpleLanguage(); |
| return language.createExpression(expression); |
| } |
| |
| protected Expression createSimpleExpression(String expression) { |
| if (ObjectHelper.isEqualToAny(expression, "body", "in.body")) { |
| return ExpressionBuilder.bodyExpression(); |
| } else if (ObjectHelper.equal(expression, "out.body")) { |
| return ExpressionBuilder.outBodyExpression(); |
| } else if (ObjectHelper.equal(expression, "id")) { |
| return ExpressionBuilder.messageIdExpression(); |
| } else if (ObjectHelper.equal(expression, "exception.message")) { |
| return ExpressionBuilder.exchangeExceptionMessageExpression(); |
| } |
| |
| // in header expression |
| String remainder = ifStartsWithReturnRemainder("in.header.", expression); |
| if (remainder == null) { |
| remainder = ifStartsWithReturnRemainder("header.", expression); |
| } |
| if (remainder == null) { |
| remainder = ifStartsWithReturnRemainder("headers.", expression); |
| } |
| if (remainder == null) { |
| remainder = ifStartsWithReturnRemainder("in.headers.", expression); |
| } |
| if (remainder != null) { |
| return ExpressionBuilder.headerExpression(remainder); |
| } |
| |
| // out header expression |
| remainder = ifStartsWithReturnRemainder("out.header.", expression); |
| if (remainder == null) { |
| remainder = ifStartsWithReturnRemainder("out.headers.", expression); |
| } |
| if (remainder != null) { |
| return ExpressionBuilder.outHeaderExpression(remainder); |
| } |
| |
| // property |
| remainder = ifStartsWithReturnRemainder("property.", expression); |
| if (remainder != null) { |
| return ExpressionBuilder.propertyExpression(remainder); |
| } |
| |
| // system property |
| remainder = ifStartsWithReturnRemainder("sys.", expression); |
| if (remainder != null) { |
| return ExpressionBuilder.systemPropertyExpression(remainder); |
| } |
| |
| // date: prefix |
| remainder = ifStartsWithReturnRemainder("date:", expression); |
| if (remainder != null) { |
| String[] parts = remainder.split(":"); |
| if (parts.length != 2) { |
| throw new ExpressionIllegalSyntaxException("Valid syntax: ${date:command:pattern} was: " + expression); |
| } |
| String command = parts[0]; |
| String pattern = parts[1]; |
| return ExpressionBuilder.dateExpression(command, pattern); |
| } |
| |
| // bean: prefix |
| remainder = ifStartsWithReturnRemainder("bean:", expression); |
| if (remainder != null) { |
| return ExpressionBuilder.beanExpression(remainder); |
| } |
| |
| throw new ExpressionIllegalSyntaxException(expression); |
| } |
| |
| public boolean isSingleton() { |
| return true; |
| } |
| } |