/*
* Copyright 2009-2010 the original author or authors.
*
* Licensed 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.springframework.batch.admin.web.views;
import java.util.Map;
import org.codehaus.jackson.map.MappingJsonFactory;
import org.springframework.context.expression.MapAccessor;
import org.springframework.expression.spel.standard.SpelExpressionParser;
import org.springframework.expression.spel.support.StandardEvaluationContext;
public class JsonWrapper {
private final SpelExpressionParser parser;
private final StandardEvaluationContext context;
private final Map<String, Object> target;
@SuppressWarnings("unchecked")
public JsonWrapper(String content) throws Exception {
target = new MappingJsonFactory().createJsonParser(content).readValueAs(Map.class);
context = new StandardEvaluationContext();
context.addPropertyAccessor(new MapAccessor());
parser = new SpelExpressionParser();
}
public Object get(String expression) throws Exception {
return get(expression, Object.class);
}
@SuppressWarnings("unchecked")
public <T> T get(String expression, Class<T> type) throws Exception {
return (T) parser.parseExpression(expression).getValue(context, target);
}
@Override
public String toString() {
return target.toString();
}
}