content: /**
   *  Copyright (c) 2013-2016 Angelo ZERR.
   *  All rights reserved. This program and the accompanying materials
   *  are made available under the terms of the Eclipse Public License v1.0
   *  which accompanies this distribution, and is available at
   *  http://www.eclipse.org/legal/epl-v10.html
   *
   *  Contributors:
   *  Angelo Zerr <angelo.zerr@gmail.com> - initial API and implementation
   */
  package tern.server.protocol;
  
  import java.io.IOException;
  import java.io.Reader;
  
  import com.eclipsesource.json.Json;
  import com.eclipsesource.json.JsonObject;
  import com.eclipsesource.json.JsonObject.Member;
  import com.eclipsesource.json.JsonValue;
  
  import tern.utils.IOUtils;
  
  /**
   * Helper for minimal-json.
   *
   */
  public class JsonHelper {
  
  	private JsonHelper() {
  	}
  
  	public static String getString(JsonObject json, String name) {
  		JsonValue value = json.get(name);
  		return getString(value);
  	}
  
  	public static String getString(JsonValue value) {
  		if (value == null) {
  			return null;
  		}
  		if (value.isString()) {
  			return value.asString();
  		}
  		return value.toString();
  	}
  
  	public static Integer getInteger(JsonObject json, String name) {
  		JsonValue value = json.get(name);
  		return value == null ? null : value.asInt();
  	}
  
  	public static Boolean getBoolean(JsonObject json, String name) {
  		JsonValue value = json.get(name);
  		return value == null ? null : value.asBoolean();
  	}
  
  	public static boolean getBoolean(JsonObject json, String name,
  			boolean defaultValue) {
  		Boolean result = getBoolean(json, name);
  		return result != null ? result : defaultValue;
  	}
  
  	public static Long getLong(JsonObject json, String name) {
  		JsonValue value = json.get(name);
  		return value == null ? null : value.asLong();
  	}
  	
  	public static Object getValue(JsonValue value) {
  		if (value == null) {
  			return null;
  		}
  		if (value.isString()) {
  			return value.asString();
  		}
  		if (value.isBoolean()) {
  			return value.asBoolean();
  		}
  		if (value.isNumber()) {
  			return value.asInt();
  		}
  		if (value.isNull()) {
  			return null;
  		}
  		return value;
  	}
  
  	/**
  	 * Read JSON stream from the given reader and set the result in the given
  	 * {@link JsonObject} to.
  	 * 
  	 * @param reader
  	 * @param to
  	 * @throws IOException
  	 */
  	public static void readFrom(Reader reader, JsonObject to)
  			throws IOException {
  		try {
  			copy(Json.parse(reader).asObject(), to);
  		} finally {
  			IOUtils.closeQuietly(reader);
  		}
  	}
  
  	/**
  	 * Copy content of from JSON to to JSON.
  	 * 
  	 * @param from
  	 * @param to
  	 */
  	public static void copy(JsonObject from, JsonObject to) {
  		if (from != null) {
  			for (Member member : from) {
  				to.set(member.getName(), member.getValue());
  			}
  		}
  	}
  
  	public static boolean isSameJson(JsonValue value1, JsonValue value2) {
  		if (value1 == null) {
  			return value2 == null;
  		}
  		if (value2 == null) {
  			return false;
  		}
  		return value1.toString().equals(value2.toString());
  
  	}
  }
  