javadocAggregate/org/apache/calcite/linq4j/tree/Types.html - calcite-site - Git at Google

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 <div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">org.apache.calcite.linq4j.tree</a></div>
 <h2 title="Class Types" class="title">Class Types</h2>
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 <pre>public abstract class <span class="typeNameLabel">Types</span>
 extends <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></pre>
 <div class="block">Utilities for converting between <a href="Expression.html" title="class in org.apache.calcite.linq4j.tree"><code>Expression</code></a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Type.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink"><code>Type</code></a> and
  <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang" class="externalLink"><code>Class</code></a>.</div>
 <dl>
 <dt><span class="seeLabel">See Also:</span></dt>
 <dd><a href="Primitive.html" title="enum in org.apache.calcite.linq4j.tree"><code>Primitive</code></a></dd>
 </dl>
 </li>
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 <h3>Nested Class Summary</h3>
 <table class="memberSummary">
 <caption><span>Nested Classes</span><span class="tabEnd">&nbsp;</span></caption>
 <tr>
 <th class="colFirst" scope="col">Modifier and Type</th>
 <th class="colSecond" scope="col">Class</th>
 <th class="colLast" scope="col">Description</th>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>static class&nbsp;</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="Types.ArrayType.html" title="class in org.apache.calcite.linq4j.tree">Types.ArrayType</a></span></code></th>
 <td class="colLast">
 <div class="block">Array type.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>static class&nbsp;</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="Types.MapType.html" title="class in org.apache.calcite.linq4j.tree">Types.MapType</a></span></code></th>
 <td class="colLast">
 <div class="block">Map type.</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>static interface&nbsp;</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="Types.RecordField.html" title="interface in org.apache.calcite.linq4j.tree">Types.RecordField</a></span></code></th>
 <td class="colLast">
 <div class="block">Field that belongs to a record.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>static interface&nbsp;</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="Types.RecordType.html" title="interface in org.apache.calcite.linq4j.tree">Types.RecordType</a></span></code></th>
 <td class="colLast">
 <div class="block">Base class for record-like types that do not mapped to (currently
  loaded) Java <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang" class="externalLink"><code>Class</code></a> objects.</div>
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 <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
 <tr>
 <th class="colFirst" scope="col">Modifier and Type</th>
 <th class="colSecond" scope="col">Method</th>
 <th class="colLast" scope="col">Description</th>
 </tr>
 <tr id="i0" class="altColor">
 <td class="colFirst"><code>static boolean</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#allAssignable(boolean,java.lang.Class%5B%5D,java.lang.Class%5B%5D)">allAssignable</a></span>&#8203;(boolean&nbsp;varArgs,
              <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang" class="externalLink">Class</a>[]&nbsp;parameterTypes,
              <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang" class="externalLink">Class</a>[]&nbsp;argumentTypes)</code></th>
 <td class="colLast">&nbsp;</td>
 </tr>
 <tr id="i1" class="rowColor">
 <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Type.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Type</a></code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#box(java.lang.reflect.Type)">box</a></span>&#8203;(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Type.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Type</a>&nbsp;type)</code></th>
 <td class="colLast">&nbsp;</td>
 </tr>
 <tr id="i2" class="altColor">
 <td class="colFirst"><code>static <a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a></code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#castIfNecessary(java.lang.reflect.Type,org.apache.calcite.linq4j.tree.Expression)">castIfNecessary</a></span>&#8203;(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Type.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Type</a>&nbsp;returnType,
                <a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;expression)</code></th>
 <td class="colLast">
 <div class="block">Wraps an expression in a cast if it is not already of the desired type,
  or cannot be implicitly converted to it.</div>
 </td>
 </tr>
 <tr id="i3" class="rowColor">
 <td class="colFirst"><code>static void</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#discard(java.lang.Object)">discard</a></span>&#8203;(<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>&nbsp;o)</code></th>
 <td class="colLast">&nbsp;</td>
 </tr>
 <tr id="i4" class="altColor">
 <td class="colFirst"><code>static <a href="PseudoField.html" title="interface in org.apache.calcite.linq4j.tree">PseudoField</a></code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#field(java.lang.reflect.Field)">field</a></span>&#8203;(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Field.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Field</a>&nbsp;field)</code></th>
 <td class="colLast">&nbsp;</td>
 </tr>
 <tr id="i5" class="rowColor">
 <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Type.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Type</a></code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getComponentType(java.lang.reflect.Type)">getComponentType</a></span>&#8203;(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Type.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Type</a>&nbsp;type)</code></th>
 <td class="colLast">
 <div class="block">Returns the component type of an array.</div>
 </td>
 </tr>
 <tr id="i6" class="altColor">
 <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Type.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Type</a></code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getElementType(java.lang.reflect.Type)">getElementType</a></span>&#8203;(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Type.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Type</a>&nbsp;type)</code></th>
 <td class="colLast">
 <div class="block">Returns the element type of a <a href="https://docs.oracle.com/javase/9/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util" class="externalLink"><code>Collection</code></a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang" class="externalLink"><code>Iterable</code></a>
  (including <a href="../Queryable.html" title="interface in org.apache.calcite.linq4j"><code>Queryable</code></a> and
  <a href="../Enumerable.html" title="interface in org.apache.calcite.linq4j"><code>Enumerable</code></a>), <a href="https://docs.oracle.com/javase/9/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util" class="externalLink"><code>Iterator</code></a>,
  <a href="../Enumerator.html" title="interface in org.apache.calcite.linq4j"><code>Enumerator</code></a>, or an array.</div>
 </td>
 </tr>
 <tr id="i7" class="rowColor">
 <td class="colFirst"><code>static boolean</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isArray(java.lang.reflect.Type)">isArray</a></span>&#8203;(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Type.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Type</a>&nbsp;type)</code></th>
 <td class="colLast">&nbsp;</td>
 </tr>
 <tr id="i8" class="altColor">
 <td class="colFirst"><code>static boolean</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isAssignableFrom(java.lang.reflect.Type,java.lang.reflect.Type)">isAssignableFrom</a></span>&#8203;(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Type.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Type</a>&nbsp;type0,
                 <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Type.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Type</a>&nbsp;type)</code></th>
 <td class="colLast">&nbsp;</td>
 </tr>
 <tr id="i9" class="rowColor">
 <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Constructor.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Constructor</a></code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#lookupConstructor(java.lang.reflect.Type,java.lang.Class...)">lookupConstructor</a></span>&#8203;(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Type.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Type</a>&nbsp;type,
                  <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang" class="externalLink">Class</a>...&nbsp;argumentTypes)</code></th>
 <td class="colLast">
 <div class="block">Finds a constructor of a given class that accepts a given set of
  arguments.</div>
 </td>
 </tr>
 <tr id="i10" class="altColor">
 <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Field.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Field</a></code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#lookupField(java.lang.reflect.Type,java.lang.String)">lookupField</a></span>&#8203;(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Type.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Type</a>&nbsp;type,
            <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>&nbsp;name)</code></th>
 <td class="colLast">&nbsp;</td>
 </tr>
 <tr id="i11" class="rowColor">
 <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Method.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Method</a></code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#lookupMethod(java.lang.Class,java.lang.String,java.lang.Class...)">lookupMethod</a></span>&#8203;(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang" class="externalLink">Class</a>&nbsp;clazz,
             <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>&nbsp;methodName,
             <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang" class="externalLink">Class</a>...&nbsp;argumentTypes)</code></th>
 <td class="colLast">
 <div class="block">Finds a method of a given name that accepts a given set of arguments.</div>
 </td>
 </tr>
 <tr id="i12" class="altColor">
 <td class="colFirst"><code>static boolean</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#needTypeCast(java.lang.reflect.Type,java.lang.reflect.Type)">needTypeCast</a></span>&#8203;(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Type.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Type</a>&nbsp;fromType,
             <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Type.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Type</a>&nbsp;toType)</code></th>
 <td class="colLast">
 <div class="block">When trying to cast/convert a <code>Type</code> to another <code>Type</code>,
  it is necessary to pre-check whether the cast operation is needed.</div>
 </td>
 </tr>
 <tr id="i13" class="rowColor">
 <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Field.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Field</a></code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#nthField(int,java.lang.Class)">nthField</a></span>&#8203;(int&nbsp;ordinal,
         <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang" class="externalLink">Class</a>&nbsp;clazz)</code></th>
 <td class="colLast">&nbsp;</td>
 </tr>
 <tr id="i14" class="altColor">
 <td class="colFirst"><code>static <a href="PseudoField.html" title="interface in org.apache.calcite.linq4j.tree">PseudoField</a></code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#nthField(int,java.lang.reflect.Type)">nthField</a></span>&#8203;(int&nbsp;ordinal,
         <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Type.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Type</a>&nbsp;clazz)</code></th>
 <td class="colLast">&nbsp;</td>
 </tr>
 <tr id="i15" class="rowColor">
 <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Type.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Type</a></code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#of(java.lang.reflect.Type,java.lang.reflect.Type...)">of</a></span>&#8203;(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Type.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Type</a>&nbsp;type,
   <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Type.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Type</a>...&nbsp;typeArguments)</code></th>
 <td class="colLast">
 <div class="block">Creates a type with generic parameters.</div>
 </td>
 </tr>
 <tr id="i16" class="altColor">
 <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Type.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Type</a></code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#stripGenerics(java.lang.reflect.Type)">stripGenerics</a></span>&#8203;(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Type.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Type</a>&nbsp;type)</code></th>
 <td class="colLast">&nbsp;</td>
 </tr>
 <tr id="i17" class="rowColor">
 <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang" class="externalLink">Class</a></code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#toClass(java.lang.reflect.Type)">toClass</a></span>&#8203;(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Type.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Type</a>&nbsp;type)</code></th>
 <td class="colLast">&nbsp;</td>
 </tr>
 <tr id="i18" class="altColor">
 <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang" class="externalLink">Class</a>[]</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#toClassArray(java.lang.Iterable)">toClassArray</a></span>&#8203;(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang" class="externalLink">Iterable</a>&lt;? extends <a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&gt;&nbsp;arguments)</code></th>
 <td class="colLast">&nbsp;</td>
 </tr>
 <tr id="i19" class="rowColor">
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 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#unbox(java.lang.reflect.Type)">unbox</a></span>&#8203;(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Type.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Type</a>&nbsp;type)</code></th>
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 <code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.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/Object.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/Object.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/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#hashCode()" title="class or interface in java.lang" class="externalLink">hashCode</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#toString()" title="class or interface in java.lang" class="externalLink">toString</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></li>
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 <div class="block">Creates a type with generic parameters.</div>
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 <div class="block">Returns the element type of a <a href="https://docs.oracle.com/javase/9/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util" class="externalLink"><code>Collection</code></a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang" class="externalLink"><code>Iterable</code></a>
  (including <a href="../Queryable.html" title="interface in org.apache.calcite.linq4j"><code>Queryable</code></a> and
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 <pre class="methodSignature">public static&nbsp;<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/reflect/Method.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Method</a>&nbsp;lookupMethod&#8203;(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang" class="externalLink">Class</a>&nbsp;clazz,
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 <div class="block">Finds a method of a given name that accepts a given set of arguments.
  Includes in its search inherited methods and methods with wider argument
  types.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>clazz</code> - Class against which method is invoked</dd>
 <dd><code>methodName</code> - Name of method</dd>
 <dd><code>argumentTypes</code> - Types of arguments</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>A method with the given name that matches the arguments given</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/RuntimeException.html?is-external=true" title="class or interface in java.lang" class="externalLink">RuntimeException</a></code> - if method not found</dd>
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 <div class="block">Finds a constructor of a given class that accepts a given set of
  arguments. Includes in its search methods with wider argument types.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>type</code> - Class against which method is invoked</dd>
 <dd><code>argumentTypes</code> - Types of arguments</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>A method with the given name that matches the arguments given</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/RuntimeException.html?is-external=true" title="class or interface in java.lang" class="externalLink">RuntimeException</a></code> - if method not found</dd>
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 <div class="block">Wraps an expression in a cast if it is not already of the desired type,
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 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>returnType</code> - Desired type</dd>
 <dd><code>expression</code> - Expression</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
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 <div class="block">When trying to cast/convert a <code>Type</code> to another <code>Type</code>,
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  We summarize general exceptions, including:

  <ol>
    <li>target Type <code>toType</code> equals with original Type <code>fromType</code></li>
    <li>target Type can be assignable from original Type</li>
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 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>fromType</code> - original type</dd>
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 <dt><span class="returnLabel">Returns:</span></dt>
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