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17 package org.yaml.snakeyaml.nodes;
18
19 import java.math.BigDecimal;
20 import java.math.BigInteger;
21 import java.net.URI;
22 import java.sql.Timestamp;
23 import java.util.Date;
24 import java.util.HashMap;
25 import java.util.HashSet;
26 import java.util.Map;
27 import java.util.Set;
28
29 import org.yaml.snakeyaml.error.YAMLException;
30 import org.yaml.snakeyaml.util.UriEncoder;
31
32 public final class Tag implements Comparable<Tag> {
33 public static final String PREFIX = "tag:yaml.org,2002:";
34 public static final Tag YAML = new Tag(PREFIX + "yaml");
35 public static final Tag VALUE = new Tag(PREFIX + "value");
36 public static final Tag MERGE = new Tag(PREFIX + "merge");
37 public static final Tag SET = new Tag(PREFIX + "set");
38 public static final Tag PAIRS = new Tag(PREFIX + "pairs");
39 public static final Tag OMAP = new Tag(PREFIX + "omap");
40 public static final Tag BINARY = new Tag(PREFIX + "binary");
41 public static final Tag INT = new Tag(PREFIX + "int");
42 public static final Tag FLOAT = new Tag(PREFIX + "float");
43 public static final Tag TIMESTAMP = new Tag(PREFIX + "timestamp");
44 public static final Tag BOOL = new Tag(PREFIX + "bool");
45 public static final Tag NULL = new Tag(PREFIX + "null");
46 public static final Tag STR = new Tag(PREFIX + "str");
47 public static final Tag SEQ = new Tag(PREFIX + "seq");
48 public static final Tag MAP = new Tag(PREFIX + "map");
49 public static final Map<Tag, Set<Class<?>>> COMPATIBILITY_MAP;
50 static {
51 COMPATIBILITY_MAP = new HashMap<Tag, Set<Class<?>>>();
52 Set<Class<?>> floatSet = new HashSet<Class<?>>();
53 floatSet.add(Double.class);
54 floatSet.add(Float.class);
55 floatSet.add(BigDecimal.class);
56 COMPATIBILITY_MAP.put(FLOAT, floatSet);
57
58 Set<Class<?>> intSet = new HashSet<Class<?>>();
59 intSet.add(Integer.class);
60 intSet.add(Long.class);
61 intSet.add(BigInteger.class);
62 COMPATIBILITY_MAP.put(INT, intSet);
63
64 Set<Class<?>> timestampSet = new HashSet<Class<?>>();
65 timestampSet.add(Date.class);
66 timestampSet.add(java.sql.Date.class);
67 timestampSet.add(Timestamp.class);
68 COMPATIBILITY_MAP.put(TIMESTAMP, timestampSet);
69 }
70
71 private final String value;
72
73 public Tag(String tag) {
74 if (tag == null) {
75 throw new NullPointerException("Tag must be provided.");
76 } else if (tag.length() == 0) {
77 throw new IllegalArgumentException("Tag must not be empty.");
78 } else if (tag.trim().length() != tag.length()) {
79 throw new IllegalArgumentException("Tag must not contain leading or trailing spaces.");
80 }
81 this.value = UriEncoder.encode(tag);
82 }
83
84 public Tag(Class<? extends Object> clazz) {
85 if (clazz == null) {
86 throw new NullPointerException("Class for tag must be provided.");
87 }
88 this.value = Tag.PREFIX + UriEncoder.encode(clazz.getName());
89 }
90
91 public Tag(URI uri) {
92 if (uri == null) {
93 throw new NullPointerException("URI for tag must be provided.");
94 }
95 this.value = uri.toASCIIString();
96 }
97
98 public String getValue() {
99 return value;
100 }
101
102 public boolean startsWith(String prefix) {
103 return value.startsWith(prefix);
104 }
105
106 public String getClassName() {
107 if (!value.startsWith(Tag.PREFIX)) {
108 throw new YAMLException("Invalid tag: " + value);
109 }
110 return UriEncoder.decode(value.substring(Tag.PREFIX.length()));
111 }
112
113 public int getLength() {
114 return value.length();
115 }
116
117 @Override
118 public String toString() {
119 return value;
120 }
121
122 @Override
123 public boolean equals(Object obj) {
124 if (obj == null) {
125 return false;
126 }
127 if (obj instanceof Tag) {
128 return value.equals(((Tag) obj).getValue());
129 } else if (obj instanceof String) {
130 if (value.equals(obj.toString())) {
131
132 System.err.println("Comparing Tag and String is deprecated.");
133 return true;
134 }
135 }
136 return false;
137 }
138
139 @Override
140 public int hashCode() {
141 return value.hashCode();
142 }
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153 public boolean isCompatible(Class<?> clazz) {
154 Set<Class<?>> set = COMPATIBILITY_MAP.get(this);
155 if (set != null) {
156 return set.contains(clazz);
157 } else {
158 return false;
159 }
160 }
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169 public boolean matches(Class<? extends Object> clazz) {
170 return value.equals(Tag.PREFIX + clazz.getName());
171 }
172
173 public int compareTo(Tag o) {
174 return value.compareTo(o.getValue());
175 }
176 }