001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.camel.component.http;
018    
019    import org.apache.camel.Exchange;
020    import org.apache.camel.Expression;
021    import org.apache.camel.builder.ExpressionBuilder;
022    import org.apache.commons.httpclient.HttpMethod;
023    import org.apache.commons.httpclient.methods.DeleteMethod;
024    import org.apache.commons.httpclient.methods.EntityEnclosingMethod;
025    import org.apache.commons.httpclient.methods.GetMethod;
026    import org.apache.commons.httpclient.methods.HeadMethod;
027    import org.apache.commons.httpclient.methods.OptionsMethod;
028    import org.apache.commons.httpclient.methods.PostMethod;
029    import org.apache.commons.httpclient.methods.PutMethod;
030    import org.apache.commons.httpclient.methods.TraceMethod;
031    
032    public enum HttpMethods implements Expression {
033    
034        GET(GetMethod.class), POST(PostMethod.class), PUT(PutMethod.class), DELETE(DeleteMethod.class), HEAD(
035            HeadMethod.class), OPTIONS(OptionsMethod.class), TRACE(TraceMethod.class);
036    
037        final Class<? extends HttpMethod> clazz;
038        final boolean entity;
039    
040        HttpMethods(Class<? extends HttpMethod> clazz) {
041            this.clazz = clazz;
042            entity = EntityEnclosingMethod.class.isAssignableFrom(clazz);
043        }
044    
045        public HttpMethod createMethod(String url) {
046            try {
047                return clazz.getDeclaredConstructor(String.class).newInstance(url);
048            } catch (Exception e) {
049                throw new RuntimeException(e);
050            }
051        }
052    
053        public final boolean isEntityEnclosing() {
054            return entity;
055        }
056    
057        public <T> T evaluate(Exchange exchange, Class<T> type) {
058            return ExpressionBuilder.constantExpression(name()).evaluate(exchange, type);
059        }
060    
061    }