]>
git.argeo.org Git - lgpl/argeo-commons.git/blob - org.argeo.util/src/org/argeo/util/LangUtils.java
1 package org
.argeo
.util
;
3 import java
.io
.IOException
;
4 import java
.io
.InputStream
;
5 import java
.io
.OutputStream
;
7 import java
.nio
.file
.Files
;
8 import java
.nio
.file
.Path
;
9 import java
.nio
.file
.StandardOpenOption
;
10 import java
.time
.ZonedDateTime
;
11 import java
.time
.temporal
.ChronoUnit
;
12 import java
.time
.temporal
.Temporal
;
13 import java
.util
.Dictionary
;
14 import java
.util
.Enumeration
;
15 import java
.util
.HashMap
;
16 import java
.util
.Hashtable
;
18 import java
.util
.Properties
;
20 import javax
.naming
.InvalidNameException
;
21 import javax
.naming
.ldap
.LdapName
;
23 public class LangUtils
{
28 * Returns an array with the names of the provided classes. Useful when
29 * registering services with multiple interfaces in OSGi.
31 public static String
[] names(Class
<?
>... clzz
) {
32 String
[] res
= new String
[clzz
.length
];
33 for (int i
= 0; i
< clzz
.length
; i
++)
34 res
[i
] = clzz
[i
].getName();
42 * Creates a new {@link Dictionary} with one key-value pair. Key should not be
43 * null, but if the value is null, it returns an empty {@link Dictionary}.
45 public static Map
<String
, Object
> map(String key
, Object value
) {
47 HashMap
<String
, Object
> props
= new HashMap
<>();
49 props
.put(key
, value
);
58 * Creates a new {@link Dictionary} with one key-value pair. Key should not be
59 * null, but if the value is null, it returns an empty {@link Dictionary}.
61 public static Dictionary
<String
, Object
> dict(String key
, Object value
) {
63 Hashtable
<String
, Object
> props
= new Hashtable
<>();
65 props
.put(key
, value
);
69 /** @deprecated Use {@link #dict(String, Object)} instead. */
71 public static Dictionary
<String
, Object
> dico(String key
, Object value
) {
72 return dict(key
, value
);
75 /** Converts a {@link Dictionary} to a {@link Map} of strings. */
76 public static Map
<String
, String
> dictToStringMap(Dictionary
<String
, ?
> properties
) {
77 if (properties
== null) {
80 Map
<String
, String
> res
= new HashMap
<>(properties
.size());
81 Enumeration
<String
> keys
= properties
.keys();
82 while (keys
.hasMoreElements()) {
83 String key
= keys
.nextElement();
84 res
.put(key
, properties
.get(key
).toString());
90 * Get a string property from this map, expecting to find it, or
91 * <code>null</code> if not found.
93 public static String
get(Map
<String
, ?
> map
, String key
) {
94 Object res
= map
.get(key
);
97 return res
.toString();
101 * Get a string property from this map, expecting to find it.
103 * @throws IllegalArgumentException if the key was not found
105 public static String
getNotNull(Map
<String
, ?
> map
, String key
) {
106 Object res
= map
.get(key
);
108 throw new IllegalArgumentException("Map " + map
+ " should contain key " + key
);
109 return res
.toString();
113 * Wraps the keys of the provided {@link Dictionary} as an {@link Iterable}.
115 public static Iterable
<String
> keys(Dictionary
<String
, ?
> props
) {
116 assert props
!= null;
117 return new DictionaryKeys(props
);
120 static String
toJson(Dictionary
<String
, ?
> props
) {
121 return toJson(props
, false);
124 static String
toJson(Dictionary
<String
, ?
> props
, boolean pretty
) {
125 StringBuilder sb
= new StringBuilder();
129 Enumeration
<String
> keys
= props
.keys();
130 while (keys
.hasMoreElements()) {
131 String key
= keys
.nextElement();
134 sb
.append('\"').append(key
).append('\"');
139 sb
.append('\"').append(props
.get(key
)).append('\"');
140 if (keys
.hasMoreElements())
146 return sb
.toString();
149 static void storeAsProperties(Dictionary
<String
, Object
> props
, Path path
) throws IOException
{
151 throw new IllegalArgumentException("Props cannot be null");
152 Properties toStore
= new Properties();
153 for (Enumeration
<String
> keys
= props
.keys(); keys
.hasMoreElements();) {
154 String key
= keys
.nextElement();
155 toStore
.setProperty(key
, props
.get(key
).toString());
157 try (OutputStream out
= Files
.newOutputStream(path
)) {
158 toStore
.store(out
, null);
162 static void appendAsLdif(String dnBase
, String dnKey
, Dictionary
<String
, Object
> props
, Path path
)
165 throw new IllegalArgumentException("Props cannot be null");
166 Object dnValue
= props
.get(dnKey
);
167 String dnStr
= dnKey
+ '=' + dnValue
+ ',' + dnBase
;
170 dn
= new LdapName(dnStr
);
171 } catch (InvalidNameException e
) {
172 throw new IllegalArgumentException("Cannot interpret DN " + dnStr
, e
);
175 throw new IllegalArgumentException("DN key " + dnKey
+ " must have a value");
176 try (Writer writer
= Files
.newBufferedWriter(path
, StandardOpenOption
.APPEND
, StandardOpenOption
.CREATE
)) {
177 writer
.append("\ndn: ");
178 writer
.append(dn
.toString());
180 for (Enumeration
<String
> keys
= props
.keys(); keys
.hasMoreElements();) {
181 String key
= keys
.nextElement();
182 Object value
= props
.get(key
);
185 // FIXME deal with binary and multiple values
186 writer
.append(value
.toString());
192 static Dictionary
<String
, Object
> loadFromProperties(Path path
) throws IOException
{
193 Properties toLoad
= new Properties();
194 try (InputStream in
= Files
.newInputStream(path
)) {
197 Dictionary
<String
, Object
> res
= new Hashtable
<String
, Object
>();
198 for (Object key
: toLoad
.keySet())
199 res
.put(key
.toString(), toLoad
.get(key
));
207 * Chain the messages of all causes (one per line, <b>starts with a line
208 * return</b>) without all the stack
210 public static String
chainCausesMessages(Throwable t
) {
211 StringBuffer buf
= new StringBuffer();
212 chainCauseMessage(buf
, t
);
213 return buf
.toString();
216 /** Recursive chaining of messages */
217 private static void chainCauseMessage(StringBuffer buf
, Throwable t
) {
218 buf
.append('\n').append(' ').append(t
.getClass().getCanonicalName()).append(": ").append(t
.getMessage());
219 if (t
.getCause() != null)
220 chainCauseMessage(buf
, t
.getCause());
226 /** Formats time elapsed since start. */
227 public static String
since(ZonedDateTime start
) {
228 ZonedDateTime now
= ZonedDateTime
.now();
229 return duration(start
, now
);
232 /** Formats a duration. */
233 public static String
duration(Temporal start
, Temporal end
) {
234 long count
= ChronoUnit
.DAYS
.between(start
, end
);
236 return count
> 1 ? count
+ " days" : count
+ " day";
237 count
= ChronoUnit
.HOURS
.between(start
, end
);
239 return count
> 1 ? count
+ " hours" : count
+ " hours";
240 count
= ChronoUnit
.MINUTES
.between(start
, end
);
242 return count
> 1 ? count
+ " minutes" : count
+ " minute";
243 count
= ChronoUnit
.SECONDS
.between(start
, end
);
244 return count
> 1 ? count
+ " seconds" : count
+ " second";
247 /** Singleton constructor. */
248 private LangUtils() {