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    • base.json.Json Maven / Gradle / Ivy

    /**
 * Creative commons Attribution-NonCommercial license.
 *
 * http://creativecommons.org/licenses/by-nc/2.5/au/deed.en_GB
 *
 * NO WARRANTY IS GIVEN OR IMPLIED, USE AT YOUR OWN RISK.
 */
package base.json;

import java.io.IOException;
import java.math.BigDecimal;
import java.sql.Timestamp;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.UUID;

import base.QueryResult;

public class Json {

	private static final DateFormat DATE_FORMAT = new SimpleDateFormat("yyyyMMdd");
	private static final DateFormat DATE_TIME_FORMAT = new SimpleDateFormat("yyyyMMddHHmmss");

	public static String toDate(Date date) {
		return DATE_FORMAT.format(date);
	}

	public static String toDateTime(Date date) {
		return DATE_TIME_FORMAT.format(date);
	}

	public static Date toDateTime(String date) throws IOException {
		try {
			return DATE_TIME_FORMAT.parse(date);
		} catch (ParseException e) {
			throw new IOException("Invalid date format: "+date);
		}
	}

	public static Date toDate(String date) throws IOException {
		try {
			return DATE_FORMAT.parse(date);
		} catch (ParseException e) {
			throw new IOException("Invalid date format: "+date);
		}
	}

	public static String escape(String string) {
		if(string == null) {
			return null;
		}
		return string.replaceAll("\\\\", "\\\\\\\\").replaceAll("\"", "\\\\\"").replaceAll("\r", "\\\\r").replaceAll("\n", "\\\\n");
	}

	@SuppressWarnings("unchecked")
	public static String toJson(Map attributes) {
		StringBuffer string = new StringBuffer();
		string.append("{");
		for(String key : attributes.keySet()) {
			if(string.length() > 1) {
				string.append(", ");
			}
			if(attributes.get(key) == null) {
				string.append("\""+key+"\":null");
				continue;
			}
			if(attributes.get(key) instanceof Long) {
				string.append("\""+key+"\":"+String.valueOf((Long)attributes.get(key))+"");
				continue;
			}
			if(attributes.get(key) instanceof BigDecimal) {
				string.append("\""+key+"\":"+String.valueOf((BigDecimal)attributes.get(key))+"");
				continue;
			}
			if(attributes.get(key) instanceof QueryResult) {
				string.append("\""+key+"\":"+((QueryResult)attributes.get(key)).toJson()+"");
				continue;
			}
			if(attributes.get(key) instanceof Integer) {
				string.append("\""+key+"\":"+String.valueOf((Integer)attributes.get(key))+"");
				continue;
			}
			if(attributes.get(key) instanceof String) {
				string.append("\""+key+"\":\""+escape((String)attributes.get(key))+"\"");
				continue;
			}
			if(attributes.get(key) instanceof Date) {
				string.append("\""+key+"\":\""+DATE_TIME_FORMAT.format((Date)attributes.get(key))+"\"");
				continue;
			}
			if(attributes.get(key) instanceof Timestamp) {
				string.append("\""+key+"\":\""+DATE_TIME_FORMAT.format((Timestamp)attributes.get(key))+"\"");
				continue;
			}
			if(attributes.get(key) instanceof Map) {
				string.append("\""+key+"\":"+toJson((Map)attributes.get(key))+"");
				continue;
			}
			if(attributes.get(key) instanceof List) {
				string.append("\""+key+"\":"+toJson((List)attributes.get(key))+"");
				continue;
			}
			if(attributes.get(key) instanceof Boolean) {
				string.append("\""+key+"\":"+(((Boolean)attributes.get(key))?"true":"false")+"");
				continue;
			}
			if(attributes.get(key) instanceof UUID) {
				string.append("\""+key+"\":\"" + attributes.get(key).toString() + "\"");
				continue;
			}

			throw new RuntimeException("Invalid JSON structure. Object of unknown type: " + attributes.get(key).getClass().getName());
		}
		string.append("}");
		return string.toString();
	}

	@SuppressWarnings("unchecked")
	public static String toJson(List list) {
		StringBuffer string = new StringBuffer();
		string.append("[");
		for(Object item : list) {
			if(string.length() > 1) {
				string.append(", ");
			}
			if(item == null) {
				string.append("null");
				continue;
			}
			if(item instanceof String) {
				string.append("\""+escape((String)item)+"\"");
				continue;
			}
			if(item instanceof QueryResult) {
				string.append(((QueryResult)item).toJson());
				continue;
			}
			if(item instanceof Date) {
				string.append("\""+DATE_TIME_FORMAT.format((Date)item)+"\"");
				continue;
			}
			if(item instanceof Map) {
				string.append(toJson((Map)item));
				continue;
			}
			if(item instanceof List) {
				string.append(toJson((List)item));
				continue;
			}
			if(item instanceof Long) {
				string.append(String.valueOf((Long)item));
				continue;
			}
			if(item instanceof BigDecimal) {
				string.append(String.valueOf((BigDecimal)item));
				continue;
			}
			if(item instanceof Integer) {
				string.append(String.valueOf((Integer)item));
				continue;
			}
			if(item instanceof Boolean) {
				string.append((((Boolean)item)?"true":"false"));
				continue;
			}
			if(item instanceof Timestamp) {
				string.append(DATE_TIME_FORMAT.format((Timestamp)item));
				continue;
			}

			throw new RuntimeException("Invalid JSON structure. Dont know how to interpret: " + item.getClass().getName());
		}
		string.append("]");
		return string.toString();
	}

	@SuppressWarnings("unchecked")
	public static String toJson(Object[] list) {
		StringBuffer string = new StringBuffer();
		string.append("[");
		for(Object item : list) {
			if(string.length() > 1) {
				string.append(", ");
			}
			if(item == null) {
				string.append("null");
				continue;
			}
			if(item instanceof String) {
				string.append("\""+escape((String)item)+"\"");
				continue;
			}
			if(item instanceof QueryResult) {
				string.append(((QueryResult)item).toJson());
				continue;
			}
			if(item instanceof Date) {
				string.append("\""+DATE_TIME_FORMAT.format((Date)item)+"\"");
				continue;
			}
			if(item instanceof Map) {
				string.append(toJson((Map)item));
				continue;
			}
			if(item instanceof List) {
				string.append(toJson((List)item));
				continue;
			}
			if(item instanceof Long) {
				string.append(String.valueOf((Long)item));
				continue;
			}
			if(item instanceof BigDecimal) {
				string.append(String.valueOf((BigDecimal)item));
				continue;
			}
			if(item instanceof Integer) {
				string.append(String.valueOf((Integer)item));
				continue;
			}
			if(item instanceof Boolean) {
				string.append((((Boolean)item)?"true":"false"));
				continue;
			}
			if(item instanceof Timestamp) {
				string.append(DATE_TIME_FORMAT.format((Timestamp)item));
				continue;
			}
			throw new RuntimeException("Invalid JSON structure. Dont know how to interpret: " + item.getClass().getName());
		}
		string.append("]");
		return string.toString();
	}

}
    
    
    
    

    




    
    
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