Package net.sf.saxon.functions

## Class NamespaceUri_1

- java.lang.Object
- - net.sf.saxon.functions.AbstractFunction
  - - net.sf.saxon.functions.SystemFunction
    - - net.sf.saxon.functions.ScalarSystemFunction
      - - net.sf.saxon.functions.NamespaceUri_1

- All Implemented Interfaces:
    `Callable`, `Function`, `GroundedValue`, `Item`, `Sequence`

      public class NamespaceUri_1
      extends ScalarSystemFunction

  This class supports the namespace-uri() function

- - ### Field Summary

    - ### Fields inherited from class net.sf.saxon.functions.ScalarSystemFunction

      `ZERO_LENGTH_STRING`

  - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `NamespaceUri_1()` |

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `AtomicValue` | `evaluate​(Item item, XPathContext context)` | Abstract method that must be supplied in subclasses to perform the evaluation
    `java.lang.String` | `getCompilerName()` | Get the (local) name of a class that can be used to generate bytecode for this system function
    `ZeroOrOne` | `resultWhenEmpty()` | Method that may be supplied in subclasses, to indicate the result that is returned when an empty sequence is supplied as the argument value.

    - ### Methods inherited from class net.sf.saxon.functions.ScalarSystemFunction

      `call, makeFunctionCall`

    - ### Methods inherited from class net.sf.saxon.functions.SystemFunction

      `dependsOnContextItem, dynamicCall, equals, export, exportAdditionalArguments, exportAttributes, fixArguments, getArity, getCardinality, getContextNode, getDescription, getDetails, getErrorCodeForTypeErrors, getFunctionItemType, getFunctionName, getIntegerBounds, getNetCost, getOperandRoles, getRequiredType, getResultItemType, getResultItemType, getRetainedStaticContext, getSpecialProperties, getStaticBaseUriString, getStreamerName, importAttributes, isTrustedResultType, makeCall, makeFunction, makeOptimizedFunctionCall, resultIfEmpty, setArity, setDetails, setRetainedStaticContext, supplyTypeInformation, toShortString, toString, typeCheckCaller`

    - ### Methods inherited from class net.sf.saxon.functions.AbstractFunction

      `atomize, deepEquals, effectiveBooleanValue, getAnnotations, getStringValue, getStringValueCS, isArray, isMap, makeNewContext, simplify, typeCheck`

    - ### Methods inherited from class java.lang.Object

      `clone, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

    - ### Methods inherited from interface net.sf.saxon.om.Function

      `getGenre`

    - ### Methods inherited from interface net.sf.saxon.om.GroundedValue

      `asIterable, concatenate, containsNode, materialize`

    - ### Methods inherited from interface net.sf.saxon.om.Item

      `getLength, head, isStreamed, itemAt, iterate, reduce, subsequence`

    - ### Methods inherited from interface net.sf.saxon.om.Sequence

      `makeRepeatable`

- - ### Constructor Detail

    - #### NamespaceUri_1

          public NamespaceUri_1()

  - ### Method Detail

    - #### evaluate

          public AtomicValue evaluate​(Item item,
                                      XPathContext context)
                               throws XPathException

      Description copied from class: `ScalarSystemFunction`
      Abstract method that must be supplied in subclasses to perform the evaluation
      Specified by:
        `evaluate` in class `ScalarSystemFunction`
      Parameters:
        `item` - the supplied argument
        `context` - the dynamic context
      Returns:
        the result of the evaluation
      Throws:
        `XPathException` - if a dynamic error occurs

    - #### resultWhenEmpty

          public ZeroOrOne resultWhenEmpty()

      Description copied from class: `ScalarSystemFunction`
      Method that may be supplied in subclasses, to indicate the result that is returned when an empty sequence is supplied as the argument value. The default is to return the empty sequence
      Overrides:
        `resultWhenEmpty` in class `ScalarSystemFunction`
      Returns:
        the result of evaluation when the supplied argument is an empty sequence

    - #### getCompilerName

          public java.lang.String getCompilerName()

      Description copied from class: `SystemFunction`
      Get the (local) name of a class that can be used to generate bytecode for this system function
      Overrides:
        `getCompilerName` in class `SystemFunction`
      Returns:
        the name of a bytecode generation class, or null if there is no bytecode support for this function