[lang][patch]ArrayUtils.subarray(Object, startIndex, endIndex) implementation v1.1

[Ash <eq...@hotmail.com>]

Here is my submission of the ArrayUtils.subarray() with the changes
suggested
by Stephen.

Eagerly waiting for feedback and more.
Ash




----- Original Message -----
From: "Stephen Colebourne" <sc...@btopenworld.com>
To: "Jakarta Commons Developers List" <co...@jakarta.apache.org>
Cc: <eq...@hotmail.com>
Sent: Monday, November 24, 2003 5:47 AM
Subject: Re: [lang] new functionality in StringUtils and ArrayUtils -
proposal 01


> So many new concepts.....;-)
>
> flank/singleQuote/doubleQuote/enclose
> This has some potential as a StringUtils addition. Perhaps just focussing
on
> the enclose method name, with
>  enclose(str, encloseWith)
>  enclose(str, before, after)
> Similar to string appending though so is it justified?
>
> lead/trail
> Very little gain over string appending - just null checking. But then
thats
> what StringUtils often is. These two could become one though:
>   concat(str1, str2)
>
>  ArrayUtils.toString with alternate delimiter
> I can't see the use case for this, and if it exists then ToStringBuilder
> already handles it.
>
>  ArrayUtils.toString(Object arr, int startIndex, int endIndex)
> Possible, but how often is this needed?
>
>  ArrayUtils.subarray(arr, startIndex, endIndex)
> Looks good +1. Just need to determine whether the end points are inclusive
> or exclusive (suggest copying List API)
>
>
> To proceded with ArrayUtils.subarray (gets you started), submit a CVS
patch
> against the latest CVS with the new addition and suitable tests.
>
> Stephen
>
>
> From: "Ash .." <eq...@hotmail.com>
> >   /**
> >   * Flanks the given string with the flank String or char.
> >   * <pre>
> >   * StringUtils.flank(null, *)      = null
> >   * StringUtils.flank("", *)        = *
> >   * StringUtils.flank("abc", null)  = abc
> >   * StringUtils.flank("abc", "x")  = xabcx
> >   * StringUtils.flank("abc", "xy")  = xyabcxy  // xy...xy
> >   * </pre>
> >   */
> >   StringUtils.flank(String flankee, String flank)
> >   StringUtils.flank(String flankee, char flank)
> >
> >
> > Some special cases of flanking are quotes.
> >
> >   /**
> >    * <pre>
> >    * StringUtils.singleQuote("Now is the time...") = 'Now is the
time...'
> >    * </pre>
> >    */
> >   StringUtils.singleQuote(String quotee)
> >
> >   /**
> >    * <pre>
> >    * StringUtils.doubleQuote("Now is the time...") = "Now is the
time..."
> >    * </pre>
> >    */
> >   StringUtils.doubleQuote(String quotee)
> >
> >
> >
> >   /**
> >    * Enclose the string with a pair of symmetrical characters
> >    * given one of the pair. Such pairs are
> >    *
> >    * <tt>
> >    * (), {}, [], &lt;&gt;,
> >    * </tt>
> >    *
> >    * When the encloser is not from a recognized pair,
> >    * the method resorts to flank-like appending, with the order
> >    * for the afterpart reversed.
> >    *
> >    * <pre>
> >    * StringUtils.enclose("abc", "[")    = "[abc]"
> >    * StringUtils.enclose("abc", "[[")   = "[[abc]]"
> >    * StringUtils.enclose("abc", "x")    = xabcx
> >    * StringUtils.enclose("abc", "xy")   = xyabcyx  // xy..yx
> >    * </pre>
> >    *
> >    * @param enclosee the String to be enclosed
> >    * @param either of such pairs of strings as given above
> >    */
> >   StringUtils.enclose(String enclosee, String encloser)
> >
> >
> >
> >   /**
> >    * <pre>
> >    * StringUtils.lead("abc", "zz")  = "zzabc"
> >    * </pre>
> >    */
> >   StringUtils.lead(String leadee, String leadStr)
> >   StringUtils.lead(String leadee, String leadChar)
> >
> >   /**
> >    * <pre>
> >    * StringUtils.lead("abc", '.', 3)  = "abc..."
> >    */
> >   StringUtils.lead(String leadee, char leadStr,   int repeatCount)
> >   StringUtils.lead(String leadee, String leadStr, int repeatCount)
> >
> >   /**
> >    * <pre>
> >    * StringUtils.trail("abc", "zz")  = "abczz"
> >    * </pre>
> >    */
> >   StringUtils.trail(String trailee, String trailStr)
> >   StringUtils.trail(String trailee, char trailChar)
> >   StringUtils.trail(String trailee, String trailStr, int repeatCount)
> >   StringUtils.trail(String trailee, char trailChar, int repeatCount)
> >
> >
> >
> >   /**
> >    * The concept of naught.
> >    * True if the String is null or "null".
> >    * <pre>
> >    * StringUtils.isNaught("abc") = false
> >    * StringUtils.isNaught(null)  = true
> >    * StringUtils.isNaught("null") = true
> >    * </pre>
> >    */
> >   StringUtils.isNaught(String str)
> >
> >
> >
> >   // ArrayUtils methods
> >
> >   /**
> >    * Similar to the existing <code>toString</code> but
> >    * using delimiter given.
> >    */
> >   ArrayUtils.toString(Object array, String delimiter)
> >   ArrayUtils.toString(Object array, char delimiter)
> >
> >   /**
> >    * A <code>toString</code> that emits only a given part
> >    * of the array.
> >    */
> >   ArrayUtils.toString(Object arr, int startIndex, int endIndex)
> >
> >
> >
> >   /**
> >    * Obtain a new array of the given size, with the elements
> >    * present between startIndex (inclusive) and endIndex (exclusive).
> >    */
> >   ArrayUtils.subarray(arr, startIndex, endIndex)
> >
> >
> >
> >
> > ---------------
> >
> >
> >
> >
> > >The concept of a "naught" String.
> > >
> > >A String is naught if it is either 'null' or is the literal "null".
> > >
> > >I have often encountered this situation in my JSP project where a
> > >particular
> > >parameter is passed in
> > >as x=null, and I need to insert code everytime saying if(x == null ||
> > >x.equals("null"))
> >
> > _________________________________________________________________
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> >
> >
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>