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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.calcite.util.mapping</a></div> |
| <h1 title="Enum MappingType" class="title">Enum MappingType</h1> |
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| <div class="inheritance">org.apache.calcite.util.mapping.MappingType</div> |
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| <dd><code><a href="https://docs.oracle.com/javase/9/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io" class="externalLink">Serializable</a></code>, <code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Comparable.html?is-external=true" title="class or interface in java.lang" class="externalLink">Comparable</a><<a href="MappingType.html" title="enum in org.apache.calcite.util.mapping">MappingType</a>></code>, <code>java.lang.constant.Constable</code></dd> |
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| <pre>public enum <span class="typeNameLabel">MappingType</span> |
| extends <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang" class="externalLink">Enum</a><<a href="MappingType.html" title="enum in org.apache.calcite.util.mapping">MappingType</a>></pre> |
| <div class="block">Describes the type of a mapping, from the most general |
| <a href="#MULTI_FUNCTION"><code>MULTI_FUNCTION</code></a> (every element in the source and target domain can |
| participate in many mappings) to the most restricted <a href="#BIJECTION"><code>BIJECTION</code></a> (every |
| element in the source and target domain must be paired with precisely one |
| element in the other domain). |
| |
| <p>Some common types: |
| |
| <ul> |
| <li>A surjection is a mapping if every target has at least one source; also |
| known as an 'onto' mapping. |
| <li>A mapping is a partial function if every source has at most one target. |
| <li>A mapping is a function if every source has precisely one target. |
| <li>An injection is a mapping where a target has at most one source; also |
| somewhat confusingly known as a 'one-to-one' mapping. |
| <li>A bijection is a mapping which is both an injection and a surjection. |
| Every source has precisely one target, and vice versa. |
| </ul> |
| |
| <p>Once you know what type of mapping you want, call |
| <a href="Mappings.html#create(org.apache.calcite.util.mapping.MappingType,int,int)"><code>Mappings.create(MappingType, int, int)</code></a> to create an efficient |
| implementation of that mapping.</div> |
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| <h2>Nested classes/interfaces inherited from class java.lang.<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang" class="externalLink">Enum</a></h2> |
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| </a><code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Enum.EnumDesc.html?is-external=true" title="class or interface in java.lang" class="externalLink">Enum.EnumDesc</a><<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Enum.EnumDesc.html?is-external=true" title="class or interface in java.lang" class="externalLink">E</a> extends <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang" class="externalLink">Enum</a><<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Enum.EnumDesc.html?is-external=true" title="class or interface in java.lang" class="externalLink">E</a>>></code></div> |
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| <h2>Enum Constant Summary</h2> |
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| <table> |
| <caption><span>Enum Constants</span><span class="tabEnd"> </span></caption> |
| <thead> |
| <tr> |
| <th class="colFirst" scope="col">Enum Constant</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="altColor"> |
| <th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#BIJECTION">BIJECTION</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#ELEVEN">ELEVEN</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#FOURTEEN">FOURTEEN</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#FUNCTION">FUNCTION</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#INJECTION">INJECTION</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#INVERSE_FUNCTION">INVERSE_FUNCTION</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">An inverse function has a source for every target, but a source might |
| have 0, 1 or more targets.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#INVERSE_INJECTION">INVERSE_INJECTION</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#INVERSE_PARTIAL_FUNCTION">INVERSE_PARTIAL_FUNCTION</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#INVERSE_PARTIAL_INJECTION">INVERSE_PARTIAL_INJECTION</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#INVERSE_SURJECTION">INVERSE_SURJECTION</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">An inverse surjection has a source for every target, and no source has |
| more than one target.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#MULTI_FUNCTION">MULTI_FUNCTION</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#PARTIAL_FUNCTION">PARTIAL_FUNCTION</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#PARTIAL_INJECTION">PARTIAL_INJECTION</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#PARTIAL_SURJECTION">PARTIAL_SURJECTION</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">A partial surjection has no more than one source for any target, and no |
| more than one target for any source.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#SURJECTION">SURJECTION</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
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| <th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#TEN">TEN</a></span></code></th> |
| <td class="colLast"> </td> |
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| <h2>Method Summary</h2> |
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| </tr> |
| </thead> |
| <tbody> |
| <tr class="altColor" id="i0"> |
| <td class="colFirst"><code><a href="MappingType.html" title="enum in org.apache.calcite.util.mapping">MappingType</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#inverse()">inverse</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor" id="i1"> |
| <td class="colFirst"><code>boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isA(org.apache.calcite.util.mapping.MappingType)">isA</a></span>​(<a href="MappingType.html" title="enum in org.apache.calcite.util.mapping">MappingType</a> mappingType)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns whether this mapping type is (possibly a weaker form of) a given |
| mapping type.</div> |
| </td> |
| </tr> |
| <tr class="altColor" id="i2"> |
| <td class="colFirst"><code>boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isBijection()">isBijection</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">A mapping is a bijection if it is a surjection and it is an injection.</div> |
| </td> |
| </tr> |
| <tr class="rowColor" id="i3"> |
| <td class="colFirst"><code>boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isFunction()">isFunction</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">A mapping is a total function if every source has precisely one target.</div> |
| </td> |
| </tr> |
| <tr class="altColor" id="i4"> |
| <td class="colFirst"><code>boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isInjection()">isInjection</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">A mapping is an injection if it is a function and no target has more than |
| one source.</div> |
| </td> |
| </tr> |
| <tr class="rowColor" id="i5"> |
| <td class="colFirst"><code>boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isMandatorySource()">isMandatorySource</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Constraint that every target has at least one source.</div> |
| </td> |
| </tr> |
| <tr class="altColor" id="i6"> |
| <td class="colFirst"><code>boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isMandatoryTarget()">isMandatoryTarget</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Constraint that every source has at least one target.</div> |
| </td> |
| </tr> |
| <tr class="rowColor" id="i7"> |
| <td class="colFirst"><code>boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isPartialFunction()">isPartialFunction</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">A mapping is a partial function if every source has at most one target.</div> |
| </td> |
| </tr> |
| <tr class="altColor" id="i8"> |
| <td class="colFirst"><code>boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isSingleSource()">isSingleSource</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Constraint that every target has at most one source.</div> |
| </td> |
| </tr> |
| <tr class="rowColor" id="i9"> |
| <td class="colFirst"><code>boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isSingleTarget()">isSingleTarget</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Constraint that every source has at most one target.</div> |
| </td> |
| </tr> |
| <tr class="altColor" id="i10"> |
| <td class="colFirst"><code>boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isSurjection()">isSurjection</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">A mapping is a surjection if it is a function and every target has at |
| least one source.</div> |
| </td> |
| </tr> |
| <tr class="rowColor" id="i11"> |
| <td class="colFirst"><code>static <a href="MappingType.html" title="enum in org.apache.calcite.util.mapping">MappingType</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#valueOf(java.lang.String)">valueOf</a></span>​(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a> name)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns the enum constant of this type with the specified name.</div> |
| </td> |
| </tr> |
| <tr class="altColor" id="i12"> |
| <td class="colFirst"><code>static <a href="MappingType.html" title="enum in org.apache.calcite.util.mapping">MappingType</a>[]</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#values()">values</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Returns an array containing the constants of this enum type, in |
| the order they are declared.</div> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="inheritedList"> |
| <h3>Methods inherited from class java.lang.<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang" class="externalLink">Enum</a></h3> |
| <a id="methods.inherited.from.class.java.lang.Enum"> |
| <!-- --> |
| </a><code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Enum.html?is-external=true#clone()" title="class or interface in java.lang" class="externalLink">clone</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Enum.html?is-external=true#compareTo(E)" title="class or interface in java.lang" class="externalLink">compareTo</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Enum.html?is-external=true#describeConstable()" title="class or interface in java.lang" class="externalLink">describeConstable</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Enum.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang" class="externalLink">equals</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Enum.html?is-external=true#finalize()" title="class or interface in java.lang" class="externalLink">finalize</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Enum.html?is-external=true#getDeclaringClass()" title="class or interface in java.lang" class="externalLink">getDeclaringClass</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Enum.html?is-external=true#hashCode()" title="class or interface in java.lang" class="externalLink">hashCode</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Enum.html?is-external=true#name()" title="class or interface in java.lang" class="externalLink">name</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Enum.html?is-external=true#ordinal()" title="class or interface in java.lang" class="externalLink">ordinal</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Enum.html?is-external=true#toString()" title="class or interface in java.lang" class="externalLink">toString</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Enum.html?is-external=true#valueOf(java.lang.Class,java.lang.String)" title="class or interface in java.lang" class="externalLink">valueOf</a></code></div> |
| <div class="inheritedList"> |
| <h3>Methods inherited from class java.lang.<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a></h3> |
| <a id="methods.inherited.from.class.java.lang.Object"> |
| <!-- --> |
| </a><code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang" class="externalLink">getClass</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang" class="externalLink">notify</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang" class="externalLink">notifyAll</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang" class="externalLink">wait</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang" class="externalLink">wait</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#wait(long,int)" title="class or interface in java.lang" class="externalLink">wait</a></code></div> |
| </section> |
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| </section> |
| <section class="details"> |
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| <h3><a id="FUNCTION">FUNCTION</a></h3> |
| <div class="memberSignature"><span class="modifiers">public static final</span> <span class="returnType"><a href="MappingType.html" title="enum in org.apache.calcite.util.mapping">MappingType</a></span> <span class="memberName">FUNCTION</span></div> |
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| <h3><a id="INVERSE_SURJECTION">INVERSE_SURJECTION</a></h3> |
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| <div class="block">An inverse surjection has a source for every target, and no source has |
| more than one target.</div> |
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| <h3><a id="PARTIAL_SURJECTION">PARTIAL_SURJECTION</a></h3> |
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| <div class="block">A partial surjection has no more than one source for any target, and no |
| more than one target for any source.</div> |
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| <h3><a id="PARTIAL_INJECTION">PARTIAL_INJECTION</a></h3> |
| <div class="memberSignature"><span class="modifiers">public static final</span> <span class="returnType"><a href="MappingType.html" title="enum in org.apache.calcite.util.mapping">MappingType</a></span> <span class="memberName">PARTIAL_INJECTION</span></div> |
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| <div class="memberSignature"><span class="modifiers">public static final</span> <span class="returnType"><a href="MappingType.html" title="enum in org.apache.calcite.util.mapping">MappingType</a></span> <span class="memberName">PARTIAL_FUNCTION</span></div> |
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| <h3><a id="INVERSE_FUNCTION">INVERSE_FUNCTION</a></h3> |
| <div class="memberSignature"><span class="modifiers">public static final</span> <span class="returnType"><a href="MappingType.html" title="enum in org.apache.calcite.util.mapping">MappingType</a></span> <span class="memberName">INVERSE_FUNCTION</span></div> |
| <div class="block">An inverse function has a source for every target, but a source might |
| have 0, 1 or more targets. |
| |
| <p>Obeys the constaints <a href="#isMandatorySource()"><code>isMandatorySource()</code></a>, |
| <a href="#isSingleSource()"><code>isSingleSource()</code></a>. |
| |
| <p>Similar types: |
| |
| <ul> |
| <li> <a href="#INVERSE_SURJECTION"><code>INVERSE_SURJECTION</code></a> is stronger (a source may not have |
| multiple targets); |
| <li><a href="#INVERSE_PARTIAL_FUNCTION"><code>INVERSE_PARTIAL_FUNCTION</code></a> is weaker (a target may have 0 or 1 |
| sources). |
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| <div class="block">Returns an array containing the constants of this enum type, in |
| the order they are declared.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>an array containing the constants of this enum type, in the order they are declared</dd> |
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| <div class="block">Returns the enum constant of this type with the specified name. |
| The string must match <i>exactly</i> an identifier used to declare an |
| enum constant in this type. (Extraneous whitespace characters are |
| not permitted.)</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>name</code> - the name of the enum constant to be returned.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the enum constant with the specified name</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang" class="externalLink">IllegalArgumentException</a></code> - if this enum type has no constant with the specified name</dd> |
| <dd><code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/NullPointerException.html?is-external=true" title="class or interface in java.lang" class="externalLink">NullPointerException</a></code> - if the argument is null</dd> |
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| <h3><a id="inverse()">inverse</a></h3> |
| <div class="memberSignature"><span class="modifiers">public</span> <span class="returnType"><a href="MappingType.html" title="enum in org.apache.calcite.util.mapping">MappingType</a></span> <span class="memberName">inverse</span>()</div> |
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| <div class="block">Returns whether this mapping type is (possibly a weaker form of) a given |
| mapping type. |
| |
| <p>For example, a <a href="#BIJECTION"><code>BIJECTION</code></a> is a <a href="#FUNCTION"><code>FUNCTION</code></a>, but not |
| every {link #Function} is a <a href="#BIJECTION"><code>BIJECTION</code></a>.</div> |
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| <div class="block">A mapping is a total function if every source has precisely one target.</div> |
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| <div class="memberSignature"><span class="modifiers">public</span> <span class="returnType">boolean</span> <span class="memberName">isPartialFunction</span>()</div> |
| <div class="block">A mapping is a partial function if every source has at most one target.</div> |
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| <div class="block">A mapping is a surjection if it is a function and every target has at |
| least one source.</div> |
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| <div class="block">A mapping is an injection if it is a function and no target has more than |
| one source. (In other words, every source has precisely one target.)</div> |
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| <div class="block">A mapping is a bijection if it is a surjection and it is an injection. |
| (In other words,</div> |
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| <div class="memberSignature"><span class="modifiers">public</span> <span class="returnType">boolean</span> <span class="memberName">isMandatorySource</span>()</div> |
| <div class="block">Constraint that every target has at least one source.</div> |
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| <div class="block">Constraint that every target has at most one source.</div> |
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