001 /**
002 *
003 * Licensed to the Apache Software Foundation (ASF) under one or more
004 * contributor license agreements. See the NOTICE file distributed with
005 * this work for additional information regarding copyright ownership.
006 * The ASF licenses this file to You under the Apache License, Version 2.0
007 * (the "License"); you may not use this file except in compliance with
008 * the License. You may obtain a copy of the License at
009 *
010 * http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018 package org.apache.camel.builder;
019
020 import org.apache.camel.Exchange;
021 import org.apache.camel.Expression;
022
023 /**
024 * A helper class for including portions of the
025 * <a href="http://activemq.apache.org/camel/expression.html">expression</a> and
026 * <a href="http://activemq.apache.org/camel/predicate.html">predicate</a>
027 * <a href="http://activemq.apache.org/camel/dsl.html">Java DSL</a>
028 *
029 * @version $Revision: 1.1 $
030 */
031 public class Builder {
032
033 /**
034 * Returns a constant expression
035 */
036 public static <E extends Exchange> ValueBuilder<E> constant(Object value) {
037 Expression<E> expression = ExpressionBuilder.constantExpression(value);
038 return new ValueBuilder<E>(expression);
039 }
040
041 /**
042 * Returns a predicate and value builder for headers on an exchange
043 */
044 public static <E extends Exchange> ValueBuilder<E> header(@FluentArg("name") String name) {
045 Expression<E> expression = ExpressionBuilder.headerExpression(name);
046 return new ValueBuilder<E>(expression);
047 }
048
049 /**
050 * Returns a predicate and value builder for the inbound body on an exchange
051 */
052 public static <E extends Exchange> ValueBuilder<E> body() {
053 Expression<E> expression = ExpressionBuilder.bodyExpression();
054 return new ValueBuilder<E>(expression);
055 }
056
057 /**
058 * Returns a predicate and value builder for the inbound message body as a specific type
059 */
060 public static <E extends Exchange, T> ValueBuilder<E> bodyAs( Class<T> type) {
061 Expression<E> expression = ExpressionBuilder.<E, T>bodyExpression(type);
062 return new ValueBuilder<E>(expression);
063 }
064
065 /**
066 * Returns a predicate and value builder for the outbound body on an exchange
067 */
068 public static <E extends Exchange> ValueBuilder<E> outBody() {
069 Expression<E> expression = ExpressionBuilder.bodyExpression();
070 return new ValueBuilder<E>(expression);
071 }
072
073 /**
074 * Returns a predicate and value builder for the outbound message body as a specific type
075 */
076 public static <E extends Exchange, T> ValueBuilder<E> outBody(Class<T> type) {
077 Expression<E> expression = ExpressionBuilder.<E, T>bodyExpression(type);
078 return new ValueBuilder<E>(expression);
079 }
080
081
082 /**
083 * Returns an expression for the given system property
084 */
085 public static <E extends Exchange> ValueBuilder<E> systemProperty(final String name) {
086 return systemProperty(name, null);
087 }
088
089 /**
090 * Returns an expression for the given system property
091 */
092 public static <E extends Exchange> ValueBuilder<E> systemProperty(final String name, final String defaultValue) {
093 return new ValueBuilder<E>(ExpressionBuilder.<E>systemProperty(name, defaultValue));
094 }
095 }