org.apache.camel.jsonpath.JsonPathExpression Maven / Gradle / Ivy
/**
* 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.jsonpath;
import org.apache.camel.Exchange;
import org.apache.camel.ExpressionEvaluationException;
import org.apache.camel.ExpressionIllegalSyntaxException;
import org.apache.camel.support.ExpressionAdapter;
public class JsonPathExpression extends ExpressionAdapter {
private final String expression;
private Class resultType;
private final JsonPathEngine engine;
public JsonPathExpression(String expression) {
this.expression = expression;
try {
engine = new JsonPathEngine(expression);
} catch (Exception e) {
throw new ExpressionIllegalSyntaxException(expression, e);
}
}
public Class getResultType() {
return resultType;
}
public void setResultType(Class resultType) {
this.resultType = resultType;
}
@Override
public Object evaluate(Exchange exchange) {
try {
Object result = evaluateJsonPath(exchange, engine);
if (resultType != null) {
return exchange.getContext().getTypeConverter().convertTo(resultType, exchange, result);
} else {
return result;
}
} catch (Exception e) {
throw new ExpressionEvaluationException(this, exchange, e);
}
}
@Override
public String toString() {
return "jsonpath[" + expression + "]";
}
private Object evaluateJsonPath(Exchange exchange, JsonPathEngine engine) throws Exception {
return engine.read(exchange);
}
}