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<?xml version="1.0"?>
<!DOCTYPE gsdoc PUBLIC "-//GNUstep//DTD gsdoc 1.0.4//EN" "http://www.gnustep.org/gsdoc-1_0_4.dtd">
<gsdoc base="NSValueTransformer" up="Base">
  <head>
    <title>NSValueTransformer class documentation</title>
    <author name="Generated by Debian"></author>
  </head>
  <body>
    <front><contents /></front>
    <chapter>
      <heading>
        Software documentation for the NSValueTransformer
        class
      </heading>
      <class name="NSValueTransformer" super="NSObject" ovadd="10.3.0" gvadd="1.2.0">
        <declared>Foundation/NSValueTransformer.h</declared>
        <desc>
          Instances of the NSValueTransformer class are used
          to convert values from one representation to another. The
          base class is abstract and its methods must be
          overridden by subclasses to do the actual work.
        </desc>
        <method type="BOOL" factory="yes" override="subclass" ovadd="10.3.0" gvadd="1.2.0">
          <sel>allowsReverseTransformation</sel>
          <desc>
            Returns a flag indicating whether the transformer
            permits reverse transformations.
          </desc>
        </method>
        <method type="void" factory="yes" ovadd="10.3.0" gvadd="1.2.0">
          <sel>setValueTransformer:</sel>
          <arg type="NSValueTransformer*">transformer</arg>
          <sel>forName:</sel>
          <arg type="NSString*">name</arg>
          <desc>
            Registers <var>transformer</var> to handle
            transformations with the specified
            <var>name</var>.
          </desc>
        </method>
        <method type="Class" factory="yes" override="subclass" ovadd="10.3.0" gvadd="1.2.0">
          <sel>transformedValueClass</sel>
          <desc>
            Returns the class of the value produced by this
            transformer.
          </desc>
        </method>
        <method type="NSValueTransformer*" factory="yes" ovadd="10.3.0" gvadd="1.2.0">
          <sel>valueTransformerForName:</sel>
          <arg type="NSString*">name</arg>
          <desc>
            Returns the transformer registered for the
            specified <var>name</var>, or <code>nil</code> if
            no transformer is registered for <var>name</var>. If no
            transformer is found, but the <var>name</var>
            corresponds to a valid NSValueTransformer
            subclass <var>name</var>, the receiver
            instantiates this subclass using
            <ref type="method" id="-init">
              -init
            </ref>
            and registers it automatically for <var>name</var>.
          </desc>
        </method>
        <method type="NSArray*" factory="yes" ovadd="10.3.0" gvadd="1.2.0">
          <sel>valueTransformerNames</sel>
          <desc>
            Returns an array listing the names of all
            registered value transformers.
          </desc>
        </method>
        <method type="id" ovadd="10.3.0" gvadd="1.2.0">
          <sel>reverseTransformedValue:</sel>
          <arg type="id">value</arg>
          <desc>
            Performs a reverse transformation on the specified
            <var>value</var> and returns the resulting object.
            <br /> The default implementation raises an
            exception if
            <ref type="method" id="+allowsReverseTransformation">
              +allowsReverseTransformation
            </ref>
            returns <code>NO</code>, otherwise it calls
            <ref type="method" id="-transformedValue:">
              -transformedValue:
            </ref>
            and returns the result.
          </desc>
        </method>
        <method type="id" override="subclass" ovadd="10.3.0" gvadd="1.2.0">
          <sel>transformedValue:</sel>
          <arg type="id">value</arg>
          <desc>
            Subclasses should override this method to
            perform the actual transformation (and reverse
            transformation if applicable) and return the
            result.
          </desc>
        </method>
      </class>
    </chapter>
  </body>
</gsdoc>

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