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java.text
Class CollationKey
java.lang.Object
java.text.CollationKey
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All Implemented Interfaces:
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Comparable
<
CollationKey
>
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public
abstract ![](../../diffpics/oold.gif)
final class CollationKey
- extends Object
- implements Comparable<CollationKey>
A CollationKey represents a String under the rules of a specific Collator object. Comparing two CollationKeys returns the relative order of the Strings they represent. Using CollationKeys to compare Strings is generally faster than using Collator.compare. Thus, when the Strings must be compared multiple times, for example when sorting a list of Strings. It's more efficient to use CollationKeys.
You can not create CollationKeys directly. Rather, generate them by calling Collator.getCollationKey. You can only compare CollationKeys generated from the same Collator object.
Generating a CollationKey for a String involves examining the entire String and converting it to series of bits that can be compared bitwise. This allows fast comparisons once the keys are generated. The cost of generating keys is recouped in faster comparisons when Strings need to be compared many times. On the other hand, the result of a comparison is often determined by the first couple of characters of each String. Collator.compare examines only as many characters as it needs which allows it to be faster when doing single comparisons.
The following example shows how CollationKeys might be used to sort a list of Strings.
// Create an array of CollationKeys for the Strings to be sorted.
Collator myCollator = Collator.getInstance();
CollationKey[] keys = new CollationKey[3];
keys[0] = myCollator.getCollationKey("Tom");
keys[1] = myCollator.getCollationKey("Dick");
keys[2] = myCollator.getCollationKey("Harry");
sort( keys );
//...
// Inside body of sort routine, compare keys this way
if( keys[i].compareTo( keys[j] ) > 0 )
// swap keys[i] and keys[j]
//...
// Finally, when we've returned from sort.
System.out.println( keys[0].getSourceString() );
System.out.println( keys[1].getSourceString() );
System.out.println( keys[2].getSourceString() );
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See Also:
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Collator
,
RuleBasedCollator
Method Summary
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abstract
int |
compareTo
(
CollationKey
Compare this CollationKey to the target CollationKey. |
boolean
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equals
(
Object
Compare this CollationKey and the target CollationKey for equality.
|
String
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getSourceString
()
Returns the String that this CollationKey represents. |
abstract byte[]
int
|
toByteArray
hashCode
()
Converts the CollationKey to
Creates
a
sequence of bits.
hash code for this CollationKey.
|
byte[]
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toByteArray
()
Converts the CollationKey to a sequence of bits.
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Methods inherited from class java.lang.
Object
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clone
,
equals
,
finalize
,
getClass
,
hashCode
,
notify
,
notifyAll
,
toString
,
wait
,
wait
,
wait
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Constructor
Method
Detail
|
CollationKey
compareTo
protected ![](../../diffpics/oold.gif)
public int
CollationKey ![](../../diffpics/oold.gif)
compareTo (
String![](../../diffpics/oold.gif)
CollationKey
source) ![](../../diffpics/oold.gif)
target)
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CollationKey constructor.
Compare this CollationKey to the target CollationKey. The collation rules of the Collator object which created these keys are applied. Note: CollationKeys created by different Collators can not be compared.
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-
Specified by:
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compareTo
in interface
Comparable
<
CollationKey
>
-
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Parameters:
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source - - the source string.
target - target CollationKey
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Throws:
Returns:
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NullPointerException
- if source is null.
Returns an integer value. Value is less than zero if this is less than target, value is zero if this and target are equal and value is greater than zero if this is greater than target.
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Since:
See Also:
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1.6
Collator.compare(java.lang.String, java.lang.String)
Method Detail
|
compareTo
equals
public abstract int ![](../../diffpics/oold.gif)
public boolean
compareTo ![](../../diffpics/oold.gif)
equals (
CollationKey![](../../diffpics/oold.gif)
Object target)
-
Compare this CollationKey
to
and
the target
CollationKey.
CollationKey for equality.
The collation rules of the Collator object which created these keys are applied. Note: CollationKeys created by different Collators can not be compared.
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-
Specified by:
Overrides:
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compareTo
equals
in interface
Comparable
in class
Object
<
CollationKey
>
-
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Parameters:
-
target -
target
the
CollationKey
to compare to.
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Returns:
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Returns an integer value. Value is less than zero if this is less than target, value is zero if this and target are equal and value is greater than zero if this is greater than target.
Returns true if two objects are equal, false otherwise.
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See Also:
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Collator.compare(java.lang.String, java.lang.String)
Object.hashCode()
,
Hashtable
hashCode
![](../../diffpics/oold.gif)
public int ![](../../diffpics/oold.gif)
hashCode ![](../../diffpics/oold.gif)
()
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Creates a hash code for this CollationKey. The hash value is calculated on the key itself, not the String from which the key was created. Thus if x and y are CollationKeys, then x.hashCode(x) == y.hashCode() if x.equals(y) is true. This allows language-sensitive comparison in a hash table. See the CollatinKey class description for an example.
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Overrides:
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hashCode
in class
Object
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Returns:
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the hash value based on the string's collation order.
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See Also:
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Object.equals(java.lang.Object)
,
Hashtable
getSourceString
public String getSourceString()
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Returns the String that this CollationKey represents.
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toByteArray
public
abstract byte[] toByteArray()
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Converts the CollationKey to a sequence of bits. If two CollationKeys could be legitimately compared, then one could compare the byte arrays for each of those keys to obtain the same result. Byte arrays are organized most significant byte first.
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