com.britesnow.snow.web.renderer.JsonLibJsonRenderer Maven / Gradle / Ivy

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package com.britesnow.snow.web.renderer;

import java.io.IOException;
import java.io.Writer;

import net.sf.json.JSONSerializer;
import net.sf.json.JsonConfig;
import net.sf.json.util.CycleDetectionStrategy;
import net.sf.json.util.PropertyFilter;

public class JsonLibJsonRenderer implements JsonRenderer {
	static private final String[] excludes = {"stackTrace", "password", "pwd"};

	static private final PropertyFilter ignoreNullFilter = new PropertyFilter() {

		@Override
		public boolean apply(Object source, String name, Object value) {
			if (value != null) {
				return false;
			} else {
				return true;
			}
		}

	};

	public void render(Object data, Writer out) {
		String jsonString;

		if (data == null) {
			jsonString = "{}";
		} else {
			JsonConfig jsonConfig = new JsonConfig();
			jsonConfig.setExcludes(excludes);
			jsonConfig.setCycleDetectionStrategy(CycleDetectionStrategy.LENIENT);
			jsonConfig.setJsonPropertyFilter(ignoreNullFilter);
			Object jsObj = JSONSerializer.toJSON(data, jsonConfig);
			jsonString = jsObj.toString();
		}

		try {
			out.write(jsonString);
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
	}

}