net.hasor.utils.json.JSONObjectConvertor Maven / Gradle / Ivy
// ========================================================================
// Copyright (c) 2004-2009 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
package net.hasor.utils.json;
import net.hasor.utils.json.JSON.Output;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
/* ------------------------------------------------------------ */
/**
* Convert an Object to JSON using reflection on getters methods.
*
*
*
*/
public class JSONObjectConvertor implements JSON.Convertor {
private boolean _fromJSON;
private Set _excluded = null;
public JSONObjectConvertor() {
_fromJSON = false;
}
public JSONObjectConvertor(boolean fromJSON) {
_fromJSON = fromJSON;
}
/* ------------------------------------------------------------ */
/**
* @param fromJSON
* @param excluded An array of field names to exclude from the conversion
*/
public JSONObjectConvertor(boolean fromJSON, String[] excluded) {
_fromJSON = fromJSON;
if (excluded != null)
_excluded = new HashSet(Arrays.asList(excluded));
}
public Object fromJSON(Map map) {
if (_fromJSON)
throw new UnsupportedOperationException();
return map;
}
public void toJSON(Object obj, Output out) {
try {
Class c = obj.getClass();
if (_fromJSON)
out.addClass(obj.getClass());
Method[] methods = obj.getClass().getMethods();
for (int i = 0; i < methods.length; i++) {
Method m = methods[i];
if (!Modifier.isStatic(m.getModifiers()) && m.getParameterTypes().length == 0 && m.getReturnType() != null && m.getDeclaringClass() != Object.class) {
String name = m.getName();
if (name.startsWith("is"))
name = name.substring(2, 3).toLowerCase() + name.substring(3);
else if (name.startsWith("get"))
name = name.substring(3, 4).toLowerCase() + name.substring(4);
else
continue;
if (includeField(name, obj, m))
out.add(name, m.invoke(obj, (Object[]) null));
}
}
} catch (Throwable e) {
throw new IllegalArgumentException(e);
}
}
protected boolean includeField(String name, Object o, Method m) {
return _excluded == null || !_excluded.contains(name);
}
}