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There is a newer version: 1.3.3
/*
 * KINGSTAR MEDIA SOLUTIONS Co.,LTD. Copyright c 2005-2013. All rights reserved.
 *
 * This source code is the property of KINGSTAR MEDIA SOLUTIONS LTD. It is intended
 * only for the use of KINGSTAR MEDIA application development. Reengineering, reproduction
 * arose from modification of the original source, or other redistribution of this source
 * is not permitted without written permission of the KINGSTAR MEDIA SOLUTIONS LTD.
 */
package me.chanjar.weixin.common.util.json;


import com.google.gson.JsonElement;
import com.google.gson.JsonObject;


public class GsonHelper {

	public static boolean isNull(JsonElement element) {
		return element == null || element.isJsonNull();
	}
	
	public static boolean isNotNull(JsonElement element) {
		return !isNull(element);
	}
	
	public static Long getLong(JsonObject json, String property) {
		return getAsLong(json.get(property));
	}
	
	public static long getPrimitiveLong(JsonObject json, String property) {
		return getAsPrimitiveLong(json.get(property));
	}

	public static Integer getInteger(JsonObject json, String property) {
		return getAsInteger(json.get(property));
	}

	public static int getPrimitiveInteger(JsonObject json, String property) {
		return getAsPrimitiveInt(json.get(property));
	}
	
	public static Double getDouble(JsonObject json, String property) {
		return getAsDouble(json.get(property));
	}
	
	public static double getPrimitiveDouble(JsonObject json, String property) {
		return getAsPrimitiveDouble(json.get(property));
	}
	
	public static Float getFloat(JsonObject json, String property) {
		return getAsFloat(json.get(property));
	}
	
	public static float getPrimitiveFloat(JsonObject json, String property) {
		return getAsPrimitiveFloat(json.get(property));
	}
	
	public static Boolean getBoolean(JsonObject json, String property) {
		return getAsBoolean(json.get(property));
	}

	public static String getString(JsonObject json, String property) {
		return getAsString(json.get(property));
	}
	
	public static String getAsString(JsonElement element) {
		return isNull(element) ? null : element.getAsString();
	}
	
	public static Long getAsLong(JsonElement element) {
		return isNull(element) ? null : element.getAsLong();
	}
	
	public static long getAsPrimitiveLong(JsonElement element) {
		Long r = getAsLong(element);
		return r == null ? 0l : r;
	}
	
	public static Integer getAsInteger(JsonElement element) {
		return isNull(element) ? null : element.getAsInt();
	}
	
	public static int getAsPrimitiveInt(JsonElement element) {
		Integer r = getAsInteger(element);
		return r == null ? 0 : r;
	}
	
	public static Boolean getAsBoolean(JsonElement element) {
		return isNull(element) ? null : element.getAsBoolean();
	}
	
	public static boolean getAsPrimitiveBool(JsonElement element) {
		Boolean r = getAsBoolean(element);
		return r == null ? false : r.booleanValue();
	}
	
	public static Double getAsDouble(JsonElement element) {
		return isNull(element) ? null : element.getAsDouble();
	}
	
	public static double getAsPrimitiveDouble(JsonElement element) {
		Double r = getAsDouble(element);
		return r == null ? 0d : r;
	}
	
	public static Float getAsFloat(JsonElement element) {
		return isNull(element) ? null : element.getAsFloat();
	}
	
	public static float getAsPrimitiveFloat(JsonElement element) {
		Float r = getAsFloat(element);
		return r == null ? 0f : r;
	}
	
}