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122 changes: 122 additions & 0 deletions
122
src/main/java/com/helger/jcodemodel/util/JCStringHelper.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,122 @@ | ||
| package com.helger.jcodemodel.util; | ||
|
|
||
| import javax.annotation.CheckForSigned; | ||
| import javax.annotation.Nonnegative; | ||
| import javax.annotation.Nonnull; | ||
| import javax.annotation.Nullable; | ||
|
|
||
| public final class JCStringHelper | ||
| { | ||
| /** Constant empty String array */ | ||
| public static final String [] EMPTY_STRING_ARRAY = new String [0]; | ||
|
|
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| private JCStringHelper () | ||
| {} | ||
|
|
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| /** | ||
| * Check if the string is <code>null</code> or empty. | ||
| * | ||
| * @param sStr | ||
| * The string to check. May be <code>null</code>. | ||
| * @return <code>true</code> if the string is <code>null</code> or empty, | ||
| * <code>false</code> otherwise | ||
| */ | ||
| public static boolean hasNoText (@Nullable final String sStr) | ||
| { | ||
| return sStr == null || sStr.isEmpty (); | ||
| } | ||
|
|
||
| @Nonnegative | ||
| public static int getCharCount (@Nullable final String s, final char cSearch) | ||
| { | ||
| return s == null ? 0 : getCharCount (s.toCharArray (), cSearch); | ||
| } | ||
|
|
||
| @Nonnegative | ||
| public static int getCharCount (@Nullable final char [] aChars, final char cSearch) | ||
| { | ||
| int ret = 0; | ||
| if (aChars != null) | ||
| for (final char c : aChars) | ||
| if (c == cSearch) | ||
| ++ret; | ||
| return ret; | ||
| } | ||
|
|
||
| /** | ||
| * Take a concatenated String and return the passed String array of all | ||
| * elements in the passed string, using specified separator char. | ||
| * | ||
| * @param cSep | ||
| * The separator to use. | ||
| * @param sElements | ||
| * The concatenated String to convert. May be <code>null</code> or | ||
| * empty. | ||
| * @return The passed collection and never <code>null</code>. | ||
| */ | ||
| @Nonnull | ||
| public static String [] getExplodedArray (final char cSep, @Nullable final String sElements) | ||
| { | ||
| return getExplodedArray (cSep, sElements, -1); | ||
| } | ||
|
|
||
| /** | ||
| * Take a concatenated String and return the passed String array of all | ||
| * elements in the passed string, using specified separator char. | ||
| * | ||
| * @param cSep | ||
| * The separator to use. | ||
| * @param sElements | ||
| * The concatenated String to convert. May be <code>null</code> or | ||
| * empty. | ||
| * @param nMaxItems | ||
| * The maximum number of items to explode. If the passed value is ≤ | ||
| * 0 all items are used. If max items is 1, than the result string is | ||
| * returned as is. If max items is larger than the number of elements | ||
| * found, it has no effect. | ||
| * @return The passed collection and never <code>null</code>. | ||
| */ | ||
| @Nonnull | ||
| public static String [] getExplodedArray (final char cSep, | ||
| @Nullable final String sElements, | ||
| @CheckForSigned final int nMaxItems) | ||
| { | ||
| if (nMaxItems == 1) | ||
| return new String [] { sElements }; | ||
| if (hasNoText (sElements)) | ||
| return EMPTY_STRING_ARRAY; | ||
|
|
||
| final int nMaxResultElements = 1 + getCharCount (sElements, cSep); | ||
| if (nMaxResultElements == 1) | ||
| { | ||
| // Separator not found | ||
| return new String [] { sElements }; | ||
| } | ||
| final String [] ret = new String [nMaxItems < 1 ? nMaxResultElements : Math.min (nMaxResultElements, nMaxItems)]; | ||
|
|
||
| // Do not use RegExCache.stringReplacePattern because of package | ||
| // dependencies | ||
| // Do not use String.split because it trims empty tokens from the end | ||
| int nStartIndex = 0; | ||
| int nItemsAdded = 0; | ||
| while (true) | ||
| { | ||
| final int nMatchIndex = sElements.indexOf (cSep, nStartIndex); | ||
| if (nMatchIndex < 0) | ||
| break; | ||
|
|
||
| ret[nItemsAdded++] = sElements.substring (nStartIndex, nMatchIndex); | ||
| // 1 == length of separator char | ||
| nStartIndex = nMatchIndex + 1; | ||
| if (nMaxItems > 0 && nItemsAdded == nMaxItems - 1) | ||
| { | ||
| // We have exactly one item the left: the rest of the string | ||
| break; | ||
| } | ||
| } | ||
| ret[nItemsAdded++] = sElements.substring (nStartIndex); | ||
| if (nItemsAdded != ret.length) | ||
| throw new IllegalStateException ("Added " + nItemsAdded + " but expected " + ret.length); | ||
| return ret; | ||
| } | ||
| } |
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