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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.datasketches.quantilescommon</a></div> |
| <h2 title="Class GenericInequalitySearch" class="title">Class GenericInequalitySearch</h2> |
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| <pre>public class <span class="typeNameLabel">GenericInequalitySearch</span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a></pre> |
| <div class="block">This provides efficient, unique and unambiguous binary searching for inequality comparison criteria |
| for ordered arrays of values that may include duplicate values. The inequality criteria include |
| <, ≤, ==, ≥, >. All the inequality criteria use the same search algorithm. |
| (Although == is not an inequality, it is included for convenience.) |
| |
| <p>In order to make the searching unique and unambiguous, we modified the traditional binary |
| search algorithm to search for adjacent pairs of values <i>{A, B}</i> in the values array |
| instead of just a single value, where <i>a</i> and <i>b</i> are the array indices of two |
| adjacent values in the array. For all the search criteria, when the algorithm has narrowed the |
| search down to a single value or adjacent pair of values, the <i>resolve()</i> method provides the |
| final result of the search. If there is no valid value in the array that satisfies the search |
| criterion, the algorithm will return -1 to the caller.</p> |
| |
| <p>Given a sorted array of values <i>arr[]</i> and a search key value <i>v</i>, the algorithms for |
| the searching criteria are given with each enum criterion.</p></div> |
| <dl> |
| <dt><span class="simpleTagLabel">Author:</span></dt> |
| <dd>Lee Rhodes</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="https://datasketches.apache.org/docs/Quantiles/SketchingQuantilesAndRanksTutorial.html"> |
| Sketching Quantiles and Ranks Tutorial</a></dd> |
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| <td class="colFirst"><code>static class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="GenericInequalitySearch.Inequality.html" title="enum in org.apache.datasketches.quantilescommon">GenericInequalitySearch.Inequality</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">The enumerator of inequalities</div> |
| </td> |
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| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E()">GenericInequalitySearch</a></span>()</code></th> |
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| <td class="colFirst"><code>static <T> int</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#find(T%5B%5D,int,int,T,org.apache.datasketches.quantilescommon.GenericInequalitySearch.Inequality,java.util.Comparator)">find</a></span>​(T[] arr, |
| int low, |
| int high, |
| T v, |
| <a href="GenericInequalitySearch.Inequality.html" title="enum in org.apache.datasketches.quantilescommon">GenericInequalitySearch.Inequality</a> crit, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util" class="externalLink">Comparator</a><T> comparator)</code></th> |
| <td class="colLast"> |
| <div class="block">Binary Search for the index of the generic value in the given search range that satisfies |
| the given Inequality criterion.</div> |
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| <h4>GenericInequalitySearch</h4> |
| <pre>public GenericInequalitySearch()</pre> |
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| <h4>find</h4> |
| <pre class="methodSignature">public static <T> int find​(T[] arr, |
| int low, |
| int high, |
| T v, |
| <a href="GenericInequalitySearch.Inequality.html" title="enum in org.apache.datasketches.quantilescommon">GenericInequalitySearch.Inequality</a> crit, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util" class="externalLink">Comparator</a><T> comparator)</pre> |
| <div class="block">Binary Search for the index of the generic value in the given search range that satisfies |
| the given Inequality criterion. |
| If -1 is returned there are no values in the search range that satisfy the inequality.</div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - The generic type of value to be used in the search process.</dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>arr</code> - the given array of comparable values that must be sorted. |
| The array must not be null or empty and the values of the array must not be null (or NaN) |
| in the range [low, high].</dd> |
| <dd><code>low</code> - the lowest index of the lowest value in the search range, inclusive.</dd> |
| <dd><code>high</code> - the highest index of the highest value in the search range, inclusive.</dd> |
| <dd><code>v</code> - the value to search for. It must not be null (or NaN).</dd> |
| <dd><code>crit</code> - one of the Inequality criteria: LT, LE, EQ, GE, GT. It must not be null.</dd> |
| <dd><code>comparator</code> - for the type T. |
| It must not be null. It must return: -1 if A < B, 0 if A == B, and +1 if A > B.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the index of the value in the given search range that satisfies the Inequality criterion.</dd> |
| </dl> |
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