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comparison src/luan/lib/json/JsonToString.java @ 1132:b70102bab110

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add json_compressed_string()
author Franklin Schmidt <fschmidt@gmail.com>
date Tue, 02 Jan 2018 21:30:41 -0700
parents 9a1aa6fc0b4e
children 9dca1e912658
comparison
equal deleted inserted replaced
1131:46732cc0ab87 1132:b70102bab110
3 import java.util.List; 3 import java.util.List;
4 import java.util.Map; 4 import java.util.Map;
5 import java.util.Iterator; 5 import java.util.Iterator;
6 6
7 7
8 public final class JsonToString { 8 public class JsonToString {
9 9
10 public static final class JsonException extends RuntimeException { 10 public static final class JsonException extends RuntimeException {
11 private JsonException(String msg) { 11 private JsonException(String msg) {
12 super(msg); 12 super(msg);
13 } 13 }
14 } 14 }
15 15
16 public static String toString(Object obj) throws JsonException { 16 public static String toString(Object obj) throws JsonException {
17 StringBuilder sb = new StringBuilder(); 17 StringBuilder sb = new StringBuilder();
18 toString(obj,sb,0); 18 new JsonToString().toString(obj,sb,0);
19 sb.append('\n'); 19 sb.append('\n');
20 return sb.toString(); 20 return sb.toString();
21 } 21 }
22 22
23 private static void toString(Object obj,StringBuilder sb,int indented) throws JsonException { 23 public static String toCompressedString(Object obj) throws JsonException {
24 StringBuilder sb = new StringBuilder();
25 JsonToString jts = new JsonToString() {
26 void indent(StringBuilder sb,int indented) {}
27 };
28 jts.toString(obj,sb,0);
29 return sb.toString();
30 }
31
32 private void toString(Object obj,StringBuilder sb,int indented) throws JsonException {
24 if( obj == null || obj instanceof Boolean || obj instanceof Number ) { 33 if( obj == null || obj instanceof Boolean || obj instanceof Number ) {
25 sb.append(obj); 34 sb.append(obj);
26 return; 35 return;
27 } 36 }
28 if( obj instanceof String ) { 37 if( obj instanceof String ) {
38 return; 47 return;
39 } 48 }
40 throw new JsonException("can't handle type "+obj.getClass().getName()); 49 throw new JsonException("can't handle type "+obj.getClass().getName());
41 } 50 }
42 51
43 private static void toString(final String s,StringBuilder sb) { 52 private void toString(final String s,StringBuilder sb) {
44 sb.append('"'); 53 sb.append('"');
45 for( int i=0; i<s.length(); i++ ) { 54 for( int i=0; i<s.length(); i++ ) {
46 char c = s.charAt(i); 55 char c = s.charAt(i);
47 switch(c) { 56 switch(c) {
48 case '"': 57 case '"':
71 } 80 }
72 } 81 }
73 sb.append('"'); 82 sb.append('"');
74 } 83 }
75 84
76 private static void toString(List list,StringBuilder sb,int indented) { 85 private void toString(List list,StringBuilder sb,int indented) {
77 sb.append('['); 86 sb.append('[');
78 if( !list.isEmpty() ) { 87 if( !list.isEmpty() ) {
79 indent(sb,indented+1); 88 indent(sb,indented+1);
80 toString(list.get(0),sb,indented+1); 89 toString(list.get(0),sb,indented+1);
81 for( int i=1; i<list.size(); i++ ) { 90 for( int i=1; i<list.size(); i++ ) {
86 } 95 }
87 sb.append(']'); 96 sb.append(']');
88 return; 97 return;
89 } 98 }
90 99
91 private static void toString(Map map,StringBuilder sb,int indented) throws JsonException { 100 private void toString(Map map,StringBuilder sb,int indented) throws JsonException {
92 sb.append('{'); 101 sb.append('{');
93 if( !map.isEmpty() ) { 102 if( !map.isEmpty() ) {
94 Iterator<Map.Entry> i = map.entrySet().iterator(); 103 Iterator<Map.Entry> i = map.entrySet().iterator();
95 indent(sb,indented+1); 104 indent(sb,indented+1);
96 toString(i.next(),sb,indented+1); 105 toString(i.next(),sb,indented+1);
102 indent(sb,indented); 111 indent(sb,indented);
103 } 112 }
104 sb.append('}'); 113 sb.append('}');
105 } 114 }
106 115
107 private static void toString(Map.Entry entry,StringBuilder sb,int indented) throws JsonException { 116 private void toString(Map.Entry entry,StringBuilder sb,int indented) throws JsonException {
108 Object key = entry.getKey(); 117 Object key = entry.getKey();
109 if( !(key instanceof String) ) 118 if( !(key instanceof String) )
110 throw new JsonException("table keys must be strings"); 119 throw new JsonException("table keys must be strings");
111 toString((String)key,sb); 120 toString((String)key,sb);
112 sb.append(": "); 121 sb.append(": ");
113 toString(entry.getValue(),sb,indented); 122 toString(entry.getValue(),sb,indented);
114 } 123 }
115 124
116 private static void indent(StringBuilder sb,int indented) { 125 void indent(StringBuilder sb,int indented) {
117 sb.append('\n'); 126 sb.append('\n');
118 for( int i=0; i<indented; i++ ) { 127 for( int i=0; i<indented; i++ ) {
119 sb.append('\t'); 128 sb.append('\t');
120 } 129 }
121 } 130 }
122 131
123 private JsonToString() {} // never 132 private JsonToString() {}
124 } 133 }