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.model.language; 018 019 import java.util.List; 020 021 import javax.xml.bind.annotation.XmlAccessType; 022 import javax.xml.bind.annotation.XmlAccessorType; 023 import javax.xml.bind.annotation.XmlAttribute; 024 import javax.xml.bind.annotation.XmlID; 025 import javax.xml.bind.annotation.XmlRootElement; 026 import javax.xml.bind.annotation.XmlTransient; 027 import javax.xml.bind.annotation.XmlType; 028 import javax.xml.bind.annotation.XmlValue; 029 import javax.xml.bind.annotation.adapters.CollapsedStringAdapter; 030 import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter; 031 032 import org.apache.camel.CamelContext; 033 import org.apache.camel.Exchange; 034 import org.apache.camel.Expression; 035 import org.apache.camel.Predicate; 036 import org.apache.camel.builder.ExpressionClause; 037 import org.apache.camel.impl.DefaultRouteContext; 038 import org.apache.camel.spi.Language; 039 import org.apache.camel.spi.RouteContext; 040 import org.apache.camel.util.CollectionStringBuffer; 041 import org.apache.camel.util.IntrospectionSupport; 042 import org.apache.camel.util.ObjectHelper; 043 044 /** 045 * A useful base class for an expression 046 * 047 * @version $Revision: 54143 $ 048 */ 049 @XmlRootElement 050 @XmlType(name = "expressionType") 051 @XmlAccessorType(XmlAccessType.FIELD) 052 public class ExpressionType implements Expression<Exchange>, Predicate<Exchange> { 053 @XmlAttribute 054 @XmlJavaTypeAdapter(CollapsedStringAdapter.class) 055 @XmlID 056 private String id; 057 @XmlValue 058 private String expression; 059 @XmlTransient 060 private Predicate predicate; 061 @XmlTransient 062 private Expression expressionValue; 063 @XmlTransient 064 private ExpressionType expressionType; 065 066 public ExpressionType() { 067 } 068 069 public ExpressionType(String expression) { 070 this.expression = expression; 071 } 072 073 public ExpressionType(Predicate predicate) { 074 this.predicate = predicate; 075 } 076 077 public ExpressionType(Expression expression) { 078 this.expressionValue = expression; 079 } 080 081 public static String getLabel(List<ExpressionType> expressions) { 082 CollectionStringBuffer buffer = new CollectionStringBuffer(); 083 for (ExpressionType expression : expressions) { 084 buffer.append(expression.getLabel()); 085 } 086 return buffer.toString(); 087 } 088 089 @Override 090 public String toString() { 091 StringBuilder sb = new StringBuilder(); 092 if (getLanguage() != null) { 093 sb.append(getLanguage() + "{"); 094 } 095 if (getExpression() != null) { 096 sb.append(getExpression()); 097 } 098 if (getPredicate() != null) { 099 sb.append(getPredicate().toString()); 100 } 101 if (getExpressionValue() != null) { 102 sb.append(getExpressionValue().toString()); 103 } 104 if (getLanguage() != null) { 105 sb.append("}"); 106 } 107 return sb.toString(); 108 } 109 110 public Object evaluate(Exchange exchange) { 111 if (expressionValue == null) { 112 RouteContext routeContext = new DefaultRouteContext(exchange.getContext()); 113 expressionValue = createExpression(routeContext); 114 } 115 ObjectHelper.notNull(expressionValue, "expressionValue"); 116 return expressionValue.evaluate(exchange); 117 } 118 119 public void assertMatches(String text, Exchange exchange) throws AssertionError { 120 if (!matches(exchange)) { 121 throw new AssertionError(text + getExpression() + " for exchange: " + exchange); 122 } 123 } 124 125 public boolean matches(Exchange exchange) { 126 if (predicate == null) { 127 RouteContext routeContext = new DefaultRouteContext(exchange.getContext()); 128 predicate = createPredicate(routeContext); 129 } 130 ObjectHelper.notNull(predicate, "predicate"); 131 return predicate.matches(exchange); 132 } 133 134 public String getLanguage() { 135 return ""; 136 } 137 138 public Predicate<Exchange> createPredicate(RouteContext routeContext) { 139 if (predicate == null) { 140 if (expressionType != null) { 141 predicate = expressionType.createPredicate(routeContext); 142 } else { 143 CamelContext camelContext = routeContext.getCamelContext(); 144 Language language = camelContext.resolveLanguage(getLanguage()); 145 predicate = language.createPredicate(getExpression()); 146 configurePredicate(routeContext, predicate); 147 } 148 } 149 return predicate; 150 } 151 152 public Expression createExpression(RouteContext routeContext) { 153 if (expressionValue == null) { 154 if (expressionType != null) { 155 expressionValue = expressionType.createExpression(routeContext); 156 } else { 157 CamelContext camelContext = routeContext.getCamelContext(); 158 Language language = camelContext.resolveLanguage(getLanguage()); 159 expressionValue = language.createExpression(getExpression()); 160 configureExpression(routeContext, expressionValue); 161 } 162 } 163 return expressionValue; 164 } 165 166 public String getExpression() { 167 return expression; 168 } 169 170 public void setExpression(String expression) { 171 this.expression = expression; 172 } 173 174 /** 175 * Gets the value of the id property. 176 */ 177 public String getId() { 178 return id; 179 } 180 181 /** 182 * Sets the value of the id property. 183 */ 184 public void setId(String value) { 185 this.id = value; 186 } 187 188 public Predicate getPredicate() { 189 return predicate; 190 } 191 192 public Expression getExpressionValue() { 193 return expressionValue; 194 } 195 196 protected void setExpressionValue(Expression expressionValue) { 197 this.expressionValue = expressionValue; 198 } 199 200 /** 201 * Returns some descriptive text to describe this node 202 */ 203 public String getLabel() { 204 String language = getExpression(); 205 if (ObjectHelper.isNullOrBlank(language)) { 206 Predicate predicate = getPredicate(); 207 if (predicate != null) { 208 return predicate.toString(); 209 } 210 Expression expressionValue = getExpressionValue(); 211 if (expressionValue != null) { 212 return expressionValue.toString(); 213 } 214 } else { 215 return language; 216 } 217 return ""; 218 } 219 220 /** 221 * Allows derived classes to set a lazily created expressionType instance 222 * such as if using the {@link ExpressionClause} 223 */ 224 protected void setExpressionType(ExpressionType expressionType) { 225 this.expressionType = expressionType; 226 } 227 228 protected void configurePredicate(RouteContext routeContext, Predicate predicate) { 229 } 230 231 protected void configureExpression(RouteContext routeContext, Expression expression) { 232 } 233 234 /** 235 * Sets a named property on the object instance using introspection 236 */ 237 protected void setProperty(Object bean, String name, Object value) { 238 try { 239 IntrospectionSupport.setProperty(bean, name, value); 240 } catch (Exception e) { 241 throw new IllegalArgumentException("Failed to set property " + name + " on " + bean 242 + ". Reason: " + e, e); 243 } 244 } 245 }