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| <h2 title="Interface ShortComparator" class="title">Interface ShortComparator</h2> |
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| <pre>public interface <span class="typeNameLabel">ShortComparator</span></pre> |
| <div class="block">A comparison function which imposes a <i>total ordering</i> on some collection of elements. Comparators can be |
| passed to a sort method (such as <tt>org.apache.mahout.math.Sorting.quickSort</tt>) to allow precise control over |
| the sort order.<p> |
| |
| Note: It is generally a good idea for comparators to implement <tt>java.io.Serializable</tt>, as they may be used as |
| ordering methods in serializable data structures. In order for the data structure to serialize successfully, the |
| comparator (if provided) must implement <tt>Serializable</tt>.<p></div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="http://docs.oracle.com/javase/7/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util"><code>Comparator</code></a>, |
| <a href="../../../../../org/apache/mahout/math/Sorting.html" title="class in org.apache.mahout.math"><code>Sorting</code></a></dd> |
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| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/mahout/math/function/ShortComparator.html#compare-short-short-">compare</a></span>(short o1, |
| short o2)</code> |
| <div class="block">Compares its two arguments for order.</div> |
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| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/mahout/math/function/ShortComparator.html#equals-java.lang.Object-">equals</a></span>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> obj)</code> |
| <div class="block">Indicates whether some other object is "equal to" this Comparator.</div> |
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| <h4>compare</h4> |
| <pre>int compare(short o1, |
| short o2)</pre> |
| <div class="block">Compares its two arguments for order. Returns a negative integer, zero, or a positive integer as the first |
| argument is less than, equal to, or greater than the second.<p> |
| |
| The implementor must ensure that <tt>sgn(compare(x, y)) == -sgn(compare(y, x))</tt> for all <tt>x</tt> and |
| <tt>y</tt>. (This implies that <tt>compare(x, y)</tt> must throw an exception if and only if <tt>compare(y, |
| x)</tt> throws an exception.)<p> |
| |
| The implementor must also ensure that the relation is transitive: <tt>((compare(x, y)>0) && (compare(y, |
| z)>0))</tt> implies <tt>compare(x, z)>0</tt>.<p> |
| |
| Finally, the implementer must ensure that <tt>compare(x, y)==0</tt> implies that <tt>sgn(compare(x, |
| z))==sgn(compare(y, z))</tt> for all <tt>z</tt>.<p></div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater |
| than the second.</dd> |
| </dl> |
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| <h4>equals</h4> |
| <pre>boolean equals(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> obj)</pre> |
| <div class="block">Indicates whether some other object is "equal to" this Comparator. This method must obey the general |
| contract of <tt>Object.equals(Object)</tt>. Additionally, this method can return <tt>true</tt> <i>only</i> if the |
| specified Object is also a comparator and it imposes the same ordering as this comparator. Thus, |
| <code>comp1.equals(comp2)</code> implies that <tt>sgn(comp1.compare(o1, o2))==sgn(comp2.compare(o1, o2))</tt> for |
| every element <tt>o1</tt> and <tt>o2</tt>.<p> |
| |
| Note that it is <i>always</i> safe <i>not</i> to override <tt>Object.equals(Object)</tt>. However, overriding this |
| method may, in some cases, improve performance by allowing programs to determine that two distinct Comparators |
| impose the same order.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a></code> in class <code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>obj</code> - the reference object with which to compare.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd><code>true</code> only if the specified object is also a comparator and it imposes the same ordering as |
| this comparator.</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang"><code>Object.hashCode()</code></a></dd> |
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