Added a JSON parser and a new DB connection handler and pool

2010-05-04 12:59:57 +00:00 · 2010-05-04 12:59:57 +00:00 · 6ad303a948
commit 6ad303a948
parent 952a388cf1
6 changed files with 785 additions and 1 deletions
--- a/src/zutil/parser/json/JSONParser.java
+++ b/src/zutil/parser/json/JSONParser.java
@ -0,0 +1,162 @@
+package zutil.parser.json;
+
+import zutil.MultiPrintStream;
+import zutil.parser.json.JSONNode.JSONType;
+
+public class JSONParser {
+	private String json;
+	private int index;
+
+
+	public static void main(String[] args){
+		JSONParser parser = new JSONParser("" +
+				"{"+
+				"     \"firstName\": \"John\","+
+				"     \"lastName\": \"Smith\","+
+				"     \"age\": 25,"+
+				"     \"address\": {"+
+				"         \"streetAddress\": \"21 2nd Street\","+
+				"         \"city\": \"New York\","+
+				"         \"state\": \"NY\","+
+				"         \"postalCode\": \"10021\""+
+				"     },"+
+				"     \"phoneNumber\": ["+
+				"         { \"type\": \"home\", \"number\": \"212 555-1234\" },"+
+				"         { \"type\": \"fax\", \"number\": \"646 555-4567\" }"+
+				"     ]"+
+		"}");
+		JSONNode node = parser.read();
+		MultiPrintStream.out.dump( node );
+		JSONWriter writer = new JSONWriter(System.out);
+		writer.write(node);
+	}
+
+	public JSONParser(String json){
+		this.json = json;
+	}
+
+	public JSONNode read(){
+		index = 0;
+		return parse(new StringBuffer(json));
+	}
+
+	protected JSONNode parse(StringBuffer json){
+		JSONNode root = null;
+		JSONNode key = null;
+		JSONNode node = null;
+		int next_index;
+
+		while(Character.isWhitespace( json.charAt(0) ) ||
+				json.charAt(0) == ',' || json.charAt(0) == ':')
+			json.deleteCharAt(0);
+		char c = json.charAt(0);
+		json.deleteCharAt(0);
+		
+		switch( c ){
+		case ']':
+		case '}':
+			return null;
+		case '{':
+			root = new JSONNode(JSONType.Map);
+			while((key = parse( json )) != null && (node = parse( json )) != null){
+				root.add( key.toString(), node );
+			}
+			break;
+		case '[':
+			root = new JSONNode(JSONType.List);
+			while((node = parse( json )) != null){
+				root.add( node );
+			}
+			break;
+		// Parse String
+		case '\"':
+			root = new JSONNode(JSONType.String);
+			next_index = json.indexOf("\"");
+			root.set( json.substring(0, next_index) );
+			json.delete(0, next_index+1);
+			break;
+		default:
+			root = new JSONNode(JSONType.Number);
+			for(next_index=0; next_index<json.length() ;++next_index)
+				if( json.charAt(next_index)==',' || 
+						json.charAt(next_index)==']' ||
+						json.charAt(next_index)=='}'){
+					break;
+				}
+			root.set( c+json.substring(0, next_index) );
+			json.delete(0, next_index);
+			break;
+		}
+
+		return root;
+	}
+
+
+	protected JSONNode parse2(){
+		System.out.println("Recursion");
+		JSONNode root = null;
+
+		for(; index<json.length() ;++index){
+			if(!Character.isWhitespace( json.charAt(index) ))
+				break;
+		}
+
+		// Parse Map
+		if( json.charAt(index)=='{' ){
+			++index;
+			System.out.println("Map:");
+			root = new JSONNode(JSONType.Map);
+			for(; index<json.length() ;++index){
+				if( json.charAt(index)=='}' ) break;
+				if( Character.isWhitespace( json.charAt(index) )) 
+					continue;
+				int next = json.indexOf(":", index+1);
+				String key = json.substring(index, next);
+				index = next+1;
+				System.out.println("New Map element: "+key);
+				root.add( key, parse2() );
+			}
+			++index;
+		}
+		// Parse List
+		else if( json.charAt(index)=='[' ){
+			++index;
+			System.out.println("List");
+			root = new JSONNode(JSONType.List);
+			for(; index<json.length() ;++index){
+				if( json.charAt(index)==']' ) break;
+				if( Character.isWhitespace( json.charAt(index) )) 
+					continue;
+				System.out.println("New List: ");
+				root.add( parse2() );
+			}
+			++index;
+		}
+		// Parse String
+		else if( json.charAt(index)=='\"' ){
+			++index;
+			int next = json.indexOf("\"", index);
+			root = new JSONNode(JSONType.String);
+			root.set( json.substring(index, next) );
+			System.out.println("String: "+root);
+			index = next;
+		}
+		// Parse Number or Boolean
+		else{
+			System.out.println("Number");
+			int next = index;
+			for(; next<json.length() ;++next)
+				if( json.charAt(next)==',' || 
+						json.charAt(next)==']' ||
+						json.charAt(next)=='}'){
+					break;
+				}
+			root = new JSONNode(JSONType.Number);
+			root.set( json.substring(index, next).trim() );
+			System.out.println("Number: "+root);
+			index = next;
+		}
+		System.out.println("Return");
+		return root;
+	}
+}