# Watch Expression Delegates

###### Identifier:

org.eclipse.debug.core.watchExpressionDelegates

###### Since:

3.0

###### Description:

This extension provides a mechanism for providing delegates to evaluate watch expressions on a per debug model basis. Watch expression delegates perform evaluations for watch expressions and report the results asynchronously.

###### Configuration Markup:

<!ELEMENT extension (watchExpressionDelegate*)>

<!ATTLIST extension

point CDATA #REQUIRED

id CDATA #IMPLIED

name CDATA #IMPLIED

>

- point - a fully qualified identifier of the target extension point
- id - an optional identifier of the extension instance
- name - an optional name of the extension instance

<!ELEMENT watchExpressionDelegate EMPTY>

<!ATTLIST watchExpressionDelegate

debugModel CDATA #REQUIRED

delegateClass CDATA #REQUIRED

>

- debugModel - specifies the id of the debug model that this delegate provides evaluations for
- delegateClass - specifies a Java class which implements `org.eclipse.debug.core.model.IWatchExpressionDelegate`, which is used to evaluate the value of an expression.

###### Examples:

    The following is the definition of a watch expression delegate for the com.example.foo plug-in:
     <extension point="org.eclipse.debug.core.watchExpressionDelegates">
       <watchExpressionDelegate
         debugModel="org.eclipse.jdt.debug"
         delegateClass="org.eclipse.jdt.internal.debug.ui.JavaWatchExpressionDelegate"/>
      </extension>

###### API Information:

Value of the attribute delegateClass must be a fully qualified name of a Java class that implements the interface org.eclipse.debug.core.model.IWatchExpressionDelegate.

Copyright (c) 2000, 2005 IBM Corporation and others.
All rights reserved. This program and the accompanying materials are made available under the terms of the Eclipse Public License v1.0 which accompanies this distribution, and is available at http://www.eclipse.org/legal/epl-v10.html