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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="NSProtocolChecker" up="Base">
  <head>
    <title>NSProtocolChecker class reference</title>
    <author name="Mike Kienenberger">
    </author>
    <copy>1995 Free Software Foundation, Inc.</copy>
  </head>
  <body>
    <front><contents /></front>
    <chapter>
      <heading>
        Software documentation for the NSProtocolChecker class
      </heading>
      <class name="NSProtocolChecker" super="NSProxy" ovadd="1.0.0">
        <declared>Foundation/NSProtocolChecker.h</declared>
        <desc>
          The NSProtocolChecker and NSProxy classes provide message
          filtering and forwarding capabilities. If you wish
          to ensure at runtime that a given object will only be sent
          messages in a certain protocol, you create an
          <code>NSProtocolChecker</code> instance with the
          protocol and the object as arguments-
<example>
    id versatileObject = [[ClassWithManyMethods alloc] init];
    id narrowObject = [NSProtocolChecker protocolCheckerWithTarget: versatileObject
                                         protocol: @protocol(SomeSpecificProtocol)];
    return narrowObject;
</example>
          This is often used in conjunction with distributed
          objects to expose only a subset of an objects methods
          to remote processes
        </desc>
        <method type="id" factory="yes" ovadd="1.0.0">
          <sel>protocolCheckerWithTarget:</sel>
          <arg type="NSObject*">anObject</arg>
          <sel>protocol:</sel>
          <arg type="Protocol*">aProtocol</arg>
          <desc>
            Allocates and initializes an NSProtocolChecker
            instance by calling
            <ref type="method" id="-initWithTarget:protocol:">
              -initWithTarget:protocol:
            </ref>
            <br /> Autoreleases and returns the new instance.
          </desc>
        </method>
        <method type="void" ovadd="1.0.0">
          <sel>forwardInvocation:</sel>
          <arg type="NSInvocation*">anInvocation</arg>
          <desc>
            Forwards any message to the delegate if the method
            is declared in the checker's protocol; otherwise raises
            an <code>NSInvalidArgumentException</code>.
          </desc>
        </method>
        <method type="id" ovadd="1.0.0">
          <sel>initWithTarget:</sel>
          <arg type="NSObject*">anObject</arg>
          <sel>protocol:</sel>
          <arg type="Protocol*">aProtocol</arg>
          <desc>
            Initializes a newly allocated NSProtocolChecker
            instance that will forward any messages in the
            <var>aProtocol</var> protocol to <var>anObject</var>,
            its delegate. Thus, the checker can be vended in lieu
            of <var>anObject</var> to restrict the messages that can
            be sent to <var>anObject</var>. If any method in the
            protocol returns <var>anObject</var>, the checker
            will replace the returned value with itself rather
            than the target object. <br /> Returns the new
            instance.
          </desc>
        </method>
        <method type="Protocol*" ovadd="1.0.0">
          <sel>protocol</sel>
          <desc>
            Returns the protocol object the checker uses to
            verify whether a given message should be forwarded
            to its delegate.
          </desc>
        </method>
        <method type="NSObject*" ovadd="1.0.0">
          <sel>target</sel>
          <desc>
            Returns the target of the NSProtocolChecker.
          </desc>
        </method>
      </class>
    </chapter>
  </body>
</gsdoc>

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