1 | /*
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2 | * Copyright 2002-2012 Drew Noakes
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3 | *
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4 | * Licensed under the Apache License, Version 2.0 (the "License");
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5 | * you may not use this file except in compliance with the License.
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6 | * You may obtain a copy of the License at
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7 | *
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8 | * http://www.apache.org/licenses/LICENSE-2.0
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9 | *
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10 | * Unless required by applicable law or agreed to in writing, software
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11 | * distributed under the License is distributed on an "AS IS" BASIS,
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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13 | * See the License for the specific language governing permissions and
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14 | * limitations under the License.
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15 | *
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16 | * More information about this project is available at:
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17 | *
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18 | * http://drewnoakes.com/code/exif/
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19 | * http://code.google.com/p/metadata-extractor/
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20 | */
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21 |
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22 | package com.drew.lang;
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23 |
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24 | import com.drew.lang.annotations.NotNull;
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25 |
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26 | import java.util.Iterator;
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27 |
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28 | /** @author Drew Noakes http://drewnoakes.com */
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29 | public class StringUtil
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30 | {
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31 | public static String join(@NotNull Iterable<? extends CharSequence> strings, @NotNull String delimiter)
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32 | {
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33 | int capacity = 0;
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34 | int delimLength = delimiter.length();
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35 |
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36 | Iterator<? extends CharSequence> iter = strings.iterator();
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37 | if (iter.hasNext())
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38 | capacity += iter.next().length() + delimLength;
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39 |
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40 | StringBuilder buffer = new StringBuilder(capacity);
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41 | iter = strings.iterator();
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42 | if (iter.hasNext()) {
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43 | buffer.append(iter.next());
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44 | while (iter.hasNext()) {
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45 | buffer.append(delimiter);
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46 | buffer.append(iter.next());
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47 | }
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48 | }
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49 | return buffer.toString();
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50 | }
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51 |
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52 | public static <T extends CharSequence> String join(@NotNull T[] strings, @NotNull String delimiter)
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53 | {
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54 | int capacity = 0;
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55 | int delimLength = delimiter.length();
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56 | for (T value : strings)
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57 | capacity += value.length() + delimLength;
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58 |
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59 | StringBuilder buffer = new StringBuilder(capacity);
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60 | boolean first = true;
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61 | for (T value : strings) {
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62 | if (!first) {
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63 | buffer.append(delimiter);
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64 | } else {
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65 | first = false;
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66 | }
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67 | buffer.append(value);
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68 | }
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69 | return buffer.toString();
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70 | }
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71 | }
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