1 | // License: GPL. For details, see LICENSE file.
|
---|
2 | package org.openstreetmap.josm.tools;
|
---|
3 |
|
---|
4 | import java.awt.Color;
|
---|
5 | import java.io.File;
|
---|
6 | import java.io.IOException;
|
---|
7 | import java.io.InputStream;
|
---|
8 | import java.io.OutputStream;
|
---|
9 | import java.text.MessageFormat;
|
---|
10 | import java.util.Collection;
|
---|
11 |
|
---|
12 | /**
|
---|
13 | * Basic utils, that can be useful in different parts of the program.
|
---|
14 | */
|
---|
15 | public class Utils {
|
---|
16 |
|
---|
17 | public static <T> boolean exists(Iterable<? extends T> collection, Predicate<? super T> predicate) {
|
---|
18 | for (T item : collection) {
|
---|
19 | if (predicate.evaluate(item))
|
---|
20 | return true;
|
---|
21 | }
|
---|
22 | return false;
|
---|
23 | }
|
---|
24 |
|
---|
25 | public static <T> boolean exists(Iterable<T> collection, Class<? extends T> klass) {
|
---|
26 | for (Object item : collection) {
|
---|
27 | if (klass.isInstance(item))
|
---|
28 | return true;
|
---|
29 | }
|
---|
30 | return false;
|
---|
31 | }
|
---|
32 |
|
---|
33 | public static <T> T find(Iterable<? extends T> collection, Predicate<? super T> predicate) {
|
---|
34 | for (T item : collection) {
|
---|
35 | if (predicate.evaluate(item))
|
---|
36 | return item;
|
---|
37 | }
|
---|
38 | return null;
|
---|
39 | }
|
---|
40 |
|
---|
41 | @SuppressWarnings("unchecked")
|
---|
42 | public static <T> T find(Iterable<? super T> collection, Class<? extends T> klass) {
|
---|
43 | for (Object item : collection) {
|
---|
44 | if (klass.isInstance(item))
|
---|
45 | return (T) item;
|
---|
46 | }
|
---|
47 | return null;
|
---|
48 | }
|
---|
49 |
|
---|
50 | public static <T> int indexOf(Iterable<? extends T> collection, Predicate<? super T> predicate) {
|
---|
51 | int i = 0;
|
---|
52 | for (T item : collection) {
|
---|
53 | if (predicate.evaluate(item))
|
---|
54 | return i;
|
---|
55 | i++;
|
---|
56 | }
|
---|
57 | return -1;
|
---|
58 | }
|
---|
59 |
|
---|
60 | /**
|
---|
61 | * Get minimum of 3 values
|
---|
62 | */
|
---|
63 | public static int min(int a, int b, int c) {
|
---|
64 | if (b < c) {
|
---|
65 | if (a < b)
|
---|
66 | return a;
|
---|
67 | return b;
|
---|
68 | } else {
|
---|
69 | if (a < c)
|
---|
70 | return a;
|
---|
71 | return c;
|
---|
72 | }
|
---|
73 | }
|
---|
74 |
|
---|
75 | public static int max(int a, int b, int c, int d) {
|
---|
76 | return Math.max(Math.max(a, b), Math.max(c, d));
|
---|
77 | }
|
---|
78 |
|
---|
79 | /**
|
---|
80 | * for convenience: test whether 2 objects are either both null or a.equals(b)
|
---|
81 | */
|
---|
82 | public static <T> boolean equal(T a, T b) {
|
---|
83 | if (a == b)
|
---|
84 | return true;
|
---|
85 | return (a != null && a.equals(b));
|
---|
86 | }
|
---|
87 |
|
---|
88 | public static void ensure(boolean condition, String message, Object...data) {
|
---|
89 | if (!condition)
|
---|
90 | throw new AssertionError(
|
---|
91 | MessageFormat.format(message,data)
|
---|
92 | );
|
---|
93 | }
|
---|
94 |
|
---|
95 | /**
|
---|
96 | * return the modulus in the range [0, n)
|
---|
97 | */
|
---|
98 | public static int mod(int a, int n) {
|
---|
99 | if (n <= 0)
|
---|
100 | throw new IllegalArgumentException();
|
---|
101 | int res = a % n;
|
---|
102 | if (res < 0) {
|
---|
103 | res += n;
|
---|
104 | }
|
---|
105 | return res;
|
---|
106 | }
|
---|
107 |
|
---|
108 | /**
|
---|
109 | * Joins a list of strings (or objects that can be converted to string via
|
---|
110 | * Object.toString()) into a single string with fields separated by sep.
|
---|
111 | * @param sep the separator
|
---|
112 | * @param values collection of objects, null is converted to the
|
---|
113 | * empty string
|
---|
114 | * @return null if values is null. The joined string otherwise.
|
---|
115 | */
|
---|
116 | public static String join(String sep, Collection<?> values) {
|
---|
117 | if (sep == null)
|
---|
118 | throw new IllegalArgumentException();
|
---|
119 | if (values == null)
|
---|
120 | return null;
|
---|
121 | if (values.isEmpty())
|
---|
122 | return "";
|
---|
123 | StringBuilder s = null;
|
---|
124 | for (Object a : values) {
|
---|
125 | if (a == null) {
|
---|
126 | a = "";
|
---|
127 | }
|
---|
128 | if(s != null) {
|
---|
129 | s.append(sep).append(a.toString());
|
---|
130 | } else {
|
---|
131 | s = new StringBuilder(a.toString());
|
---|
132 | }
|
---|
133 | }
|
---|
134 | return s.toString();
|
---|
135 | }
|
---|
136 |
|
---|
137 | /**
|
---|
138 | * convert Color to String
|
---|
139 | * (Color.toString() omits alpha value)
|
---|
140 | */
|
---|
141 | public static String toString(Color c) {
|
---|
142 | if (c == null)
|
---|
143 | return "null";
|
---|
144 | if (c.getAlpha() == 255)
|
---|
145 | return String.format("#%06x", c.getRGB() & 0x00ffffff);
|
---|
146 | else
|
---|
147 | return String.format("#%06x(alpha=%d)", c.getRGB() & 0x00ffffff, c.getAlpha());
|
---|
148 | }
|
---|
149 |
|
---|
150 | /**
|
---|
151 | * convert float range 0 <= x <= 1 to integer range 0..255
|
---|
152 | * when dealing with colors and color alpha value
|
---|
153 | * @return null if val is null, the corresponding int if val is in the
|
---|
154 | * range 0...1. If val is outside that range, return 255
|
---|
155 | */
|
---|
156 | public static Integer color_float2int(Float val) {
|
---|
157 | if (val == null)
|
---|
158 | return null;
|
---|
159 | if (val < 0 || val > 1)
|
---|
160 | return 255;
|
---|
161 | return (int) (255f * val + 0.5f);
|
---|
162 | }
|
---|
163 |
|
---|
164 | /**
|
---|
165 | * convert back
|
---|
166 | */
|
---|
167 | public static Float color_int2float(Integer val) {
|
---|
168 | if (val == null)
|
---|
169 | return null;
|
---|
170 | if (val < 0 || val > 255)
|
---|
171 | return 1f;
|
---|
172 | return ((float) val) / 255f;
|
---|
173 | }
|
---|
174 |
|
---|
175 | public static Color complement(Color clr) {
|
---|
176 | return new Color(255 - clr.getRed(), 255 - clr.getGreen(), 255 - clr.getBlue(), clr.getAlpha());
|
---|
177 | }
|
---|
178 |
|
---|
179 | public static int copyStream(InputStream source, OutputStream destination) throws IOException {
|
---|
180 | int count = 0;
|
---|
181 | byte[] b = new byte[512];
|
---|
182 | int read;
|
---|
183 | while ((read = source.read(b)) != -1) {
|
---|
184 | count += read;
|
---|
185 | destination.write(b, 0, read);
|
---|
186 | }
|
---|
187 | return count;
|
---|
188 | }
|
---|
189 |
|
---|
190 | public static boolean deleteDirectory(File path) {
|
---|
191 | if( path.exists() ) {
|
---|
192 | File[] files = path.listFiles();
|
---|
193 | for(int i=0; i<files.length; i++) {
|
---|
194 | if(files[i].isDirectory()) {
|
---|
195 | deleteDirectory(files[i]);
|
---|
196 | }
|
---|
197 | else {
|
---|
198 | files[i].delete();
|
---|
199 | }
|
---|
200 | }
|
---|
201 | }
|
---|
202 | return( path.delete() );
|
---|
203 | }
|
---|
204 | }
|
---|