/**
* 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.builder;
import org.apache.camel.Exchange;
import org.apache.camel.Expression;
import org.apache.camel.Predicate;
import org.apache.camel.language.simple.SimpleLanguage;
import org.apache.camel.util.ObjectHelper;
/**
* Creates an {@link org.apache.camel.language.Simple} language builder.
* <p/>
* This builder is available in the Java DSL from the {@link RouteBuilder} which means that using
* simple language for {@link Expression}s or {@link Predicate}s is very easy with the help of this builder.
*
* @version
*/
public class SimpleBuilder implements Predicate, Expression {
private final String text;
private Class<?> resultType;
// cache the expression/predicate
private volatile Expression expression;
private volatile Predicate predicate;
public SimpleBuilder(String text) {
this.text = text;
}
public static SimpleBuilder simple(String text) {
return new SimpleBuilder(text);
}
public static SimpleBuilder simple(String text, Class<?> resultType) {
SimpleBuilder answer = simple(text);
answer.setResultType(resultType);
return answer;
}
public String getText() {
return text;
}
public Class<?> getResultType() {
return resultType;
}
public void setResultType(Class<?> resultType) {
this.resultType = resultType;
}
public SimpleBuilder resultType(Class<?> resultType) {
setResultType(resultType);
return this;
}
public boolean matches(Exchange exchange) {
if (predicate == null) {
predicate = createPredicate(exchange);
}
return predicate.matches(exchange);
}
public <T> T evaluate(Exchange exchange, Class<T> type) {
if (expression == null) {
expression = createExpression(exchange);
}
return expression.evaluate(exchange, type);
}
private Predicate createPredicate(Exchange exchange) {
SimpleLanguage simple = (SimpleLanguage) exchange.getContext().resolveLanguage("simple");
if (resultType != null) {
simple.setResultType(resultType);
}
// resolve property placeholders
try {
String resolve = exchange.getContext().resolvePropertyPlaceholders(text);
return simple.createPredicate(resolve);
} catch (Exception e) {
throw ObjectHelper.wrapCamelExecutionException(exchange, e);
}
}
private Expression createExpression(Exchange exchange) {
SimpleLanguage simple = (SimpleLanguage) exchange.getContext().resolveLanguage("simple");
if (resultType != null) {
simple.setResultType(resultType);
}
// resolve property placeholders
try {
String resolve = exchange.getContext().resolvePropertyPlaceholders(text);
return simple.createExpression(resolve);
} catch (Exception e) {
throw ObjectHelper.wrapCamelExecutionException(exchange, e);
}
}
public String toString() {
return "Simple: " + text;
}
}