/**
* 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.ognl;
import ognl.Ognl;
import ognl.OgnlContext;
import ognl.OgnlException;
import org.apache.camel.Exchange;
import org.apache.camel.ExpressionEvaluationException;
import org.apache.camel.ExpressionIllegalSyntaxException;
import org.apache.camel.support.ExpressionSupport;
/**
* An <a href="http://www.ognl.org/">OGNL</a> {@link org.apache.camel.Expression}
*
* @version
*/
public class OgnlExpression extends ExpressionSupport {
private final String expressionString;
private final Class<?> type;
private Object expression;
public OgnlExpression(OgnlLanguage language, String expressionString, Class<?> type) {
this.expressionString = expressionString;
this.type = type;
try {
this.expression = Ognl.parseExpression(expressionString);
} catch (OgnlException e) {
throw new ExpressionIllegalSyntaxException(expressionString, e);
}
}
public static OgnlExpression ognl(String expression) {
return new OgnlExpression(new OgnlLanguage(), expression, Object.class);
}
public <T> T evaluate(Exchange exchange, Class<T> tClass) {
OgnlContext oglContext = new OgnlContext();
// setup the class resolver from camel
oglContext.setClassResolver(new CamelClassResolver(exchange.getContext().getClassResolver()));
try {
Object value = Ognl.getValue(expression, oglContext, new RootObject(exchange));
return exchange.getContext().getTypeConverter().convertTo(tClass, value);
} catch (OgnlException e) {
throw new ExpressionEvaluationException(this, exchange, e);
}
}
public Class<?> getType() {
return type;
}
protected String assertionFailureMessage(Exchange exchange) {
return expressionString;
}
@Override
public String toString() {
return "OGNL[" + expressionString + "]";
}
}