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EclipseJDT Plug-in Developer Guide
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EclipseJDT Plug-in Developer Guide
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Classpath Fix Processor

Identifier:
org.eclipse.jdt.ui.classpathFixProcessors

Since:
3.4

Description:
This extension point allows to add a processor to offer fixes for incomplete class paths when types cannot be resolved.

This extension point supports the enablement tag. Properties to test on are:

  • project: type IJavaProject; the current project
  • sourceLevel: type String; the source compliance of the current project
  • A processor can specify to override another processor. An overridden processor is only asked to provide proposals when the overriding processor returns null as proposals.

    Configuration Markup:

    <!ELEMENT extension ( classpathFixProcessor+)>

    <!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 classpathFixProcessor ( enablement? , overrides*)>

    <!ATTLIST classpathFixProcessor

    id    CDATA #REQUIRED

    name  CDATA #IMPLIED

    class CDATA #REQUIRED

    >

    • id - a unique identifier for the Classpath Fix processor
    • name - a localized name of the Classpath Fix processor
    • class - the name of the class that implements this Classpath Fix processor. The class must be public and extend org.eclipse.jdt.ui.text.java.ClasspathFixProcessor with a public 0-argument constructor.

    <!ELEMENT overrides EMPTY>

    <!ATTLIST overrides

    id IDREF #REQUIRED

    >

    • id - The id of the classspath fix processor that is overridden by the current processor. The current processor can choose to replace proposals of extended processor.

    <!ELEMENT enablement ( not , and , or , instanceof , test , systemTest , equals , count , with , resolve , adapt , iterate , reference)*>

    A generic root element. The element can be used inside an extension point to define its enablement expression. The children of an enablement expression are combined using the and operator.



    <!ELEMENT not ( not | and | or | instanceof | test | systemTest | equals | count | with | resolve | adapt | iterate | reference)>

    This element represent a NOT operation on the result of evaluating it's sub-element expression.



    <!ELEMENT and ( not , and , or , instanceof , test , systemTest , equals , count , with , resolve , adapt , iterate , reference)*>

    This element represent an AND operation on the result of evaluating all it's sub-elements expressions.



    <!ELEMENT or ( not , and , or , instanceof , test , systemTest , equals , count , with , resolve , adapt , iterate , reference)*>

    This element represent an OR operation on the result of evaluating all it's sub-element expressions.



    <!ELEMENT instanceof EMPTY>

    <!ATTLIST instanceof

    value CDATA #REQUIRED

    >

    This element is used to perform an instanceof check of the object in focus. The expression returns EvaluationResult.TRUE if the object's type is a sub type of the type specified by the attribute value. Otherwise EvaluationResult.FALSE is returned.


    • value - a fully qualified name of a class or interface.

    <!ELEMENT test EMPTY>

    <!ATTLIST test

    property              CDATA #REQUIRED

    args                  CDATA #IMPLIED

    value                 CDATA #IMPLIED

    forcePluginActivation (true | false)

    >

    This element is used to evaluate the property state of the object in focus. The set of testable properties can be extended using the propery tester extension point. The test expression returns EvaluationResult.NOT_LOADED if the property tester doing the actual testing isn't loaded yet and the attribute forcePluginActivation is set to false. If forcePluginActivation is set to true and the evaluation context used to evaluate this expression support plug-in activation then evaluating the property will result in activating the plug-in defining the tester.


    • property - the name of an object's property to test.
    • args - additional arguments passed to the property tester. Multiple arguments are separated by commas. Each individual argument is converted into a Java base type using the same rules as defined for the value attribute of the test expression.
    • value - the expected value of the property. Can be omitted if the property is a boolean property. The test expression is supposed to return EvaluationResult.TRUE if the property matches the value and EvaluationResult.FALSE otherwise. The value attribute is converted into a Java base type using the following rules:
      • the string "true" is converted into Boolean.TRUE
      • the string "false" is converted into Boolean.FALSE
      • if the string contains a dot then the interpreter tries to convert the value into a Float object. If this fails the string is treated as a java.lang.String
      • if the string only consists of numbers then the interpreter converts the value in an Integer object.
      • in all other cases the string is treated as a java.lang.String
      • the conversion of the string into a Boolean, Float, or Integer can be suppressed by surrounding the string with single quotes. For example, the attribute value="'true'" is converted into the string "true"
    • forcePluginActivation - a flag indicating whether the plug-in contributing the property tester should be loaded if necessary. As such, this flag should be used judiciously, in order to avoid unnecessary plug-in activations. Most clients should avoid setting this flag to true. This flag is only honored if the evaluation context used to evaluate this expression allows plug-in activation. Otherwise the flag is ignored and no plug-in loading takes place.

    <!ELEMENT systemTest EMPTY>

    <!ATTLIST systemTest

    property CDATA #REQUIRED

    value    CDATA #REQUIRED

    >

    Tests a system property by calling the System.getProperty method and compares the result with the value specified through the value attribute.


    • property - the name of an system property to test.
    • value - the expected value of the property. The value is interpreted as a string value.

    <!ELEMENT equals EMPTY>

    <!ATTLIST equals

    value CDATA #REQUIRED

    >

    This element is used to perform an equals check of the object in focus. The expression returns EvaluationResult.TRUE if the object is equal to the value provided by the attribute value. Otherwise EvaluationResult.FALSE is returned.


    • value - the expected value. The value provided as a string is converted into a Java base type using the same rules as for the value attribute of the test expression.

    <!ELEMENT count EMPTY>

    <!ATTLIST count

    value CDATA #REQUIRED

    >

    This element is used to test the number of elements in a collection.


    • value - an expression to specify the number of elements in a list. Following wildcard characters can be used:
      *
      any number of elements
      ?
      no elements or one element
      +
      one or more elements
      !
      no elements
      -N)
      less than N elements
      (N-
      greater than N elements
      integer value
      the list must contain the exact number of elements

    <!ELEMENT with ( not , and , or , instanceof , test , systemTest , equals , count , with , resolve , adapt , iterate , reference)*>

    <!ATTLIST with

    variable CDATA #REQUIRED

    >

    This element changes the object to be inspected for all its child element to the object referenced by the given variable. If the variable can not be resolved then the expression will throw an ExpressionException when evaluating it. The children of a with expression are combined using the and operator.


    • variable - the name of the variable to be used for further inspection. It is up to the evaluator of an extension point to provide the variable in the variable pool.

    <!ELEMENT resolve ( not , and , or , instanceof , test , systemTest , equals , count , with , resolve , adapt , iterate , reference)*>

    <!ATTLIST resolve

    variable CDATA #REQUIRED

    args     CDATA #IMPLIED

    >

    This element changes the object to be inspected for all its child element to the object referenced by the given variable. If the variable can not be resolved then the expression will throw an ExpressionException when evaluating it. The children of a resolve expression are combined using the and operator.


    • variable - the name of the variable to be resolved. This variable is then used as the object in focus for child element evaluation. It is up to the evaluator of an extension point to provide a corresponding variable resolver (see IVariableResolver) through the evaluation context passed to the root expression element when evaluating the expression.
    • args - additional arguments passed to the variable resolver. Multiple arguments are separated by commas. Each individual argument is converted into a Java base type using the same rules as defined for the value attribute of the test expression.

    <!ELEMENT adapt ( not , and , or , instanceof , test , systemTest , equals , count , with , resolve , adapt , iterate , reference)*>

    <!ATTLIST adapt

    type CDATA #REQUIRED

    >

    This element is used to adapt the object in focus to the type specified by the attribute type. The expression returns not loaded if either the adapter or the type referenced isn't loaded yet. It throws an ExpressionException during evaluation if the type name doesn't exist at all. The children of an adapt expression are combined using the and operator.


    • type - the type to which the object in focus is to be adapted.

    <!ELEMENT iterate ( not , and , or , instanceof , test , systemTest , equals , count , with , resolve , adapt , iterate , reference)*>

    <!ATTLIST iterate

    operator (or|and)

    ifEmpty  (true | false)

    >

    This element is used to iterate over a variable that is of type java.util.Collection, or a variable that adapts to org.eclipse.core.expressions.IIterable. If the object in focus is not one of the above then a CoreException with an ExpressionStatus will be thrown while evaluating the expression. The child expressions of an iterate expression are combined using the and operator.


    • operator - either "and" or "or". The operator defines how the results of all the child expressions applied to each child of the Collection or IIterable will be combined and what (if any) short circuit evaluation will be used. If not specified, "and" will be used.
    • ifEmpty - the value return from the iterate expression if the collection is empty. If not specified then true is returned when the operator equals "and" and false is return if the operator equals "or".

    <!ELEMENT reference EMPTY>

    <!ATTLIST reference

    definitionId IDREF #REQUIRED

    >

    This element is used to reference an expression from the org.eclipse.core.expressions.definitions extension point. The expression definition will be evaluated within the current expression element using the current evaluation context.


    • definitionId - The unique id of an expression from org.eclipse.core.expressions.definitions.

    Examples:
    The following is an example of a Classpath Fix processor contribution:

    
     <extension point=
    "org.eclipse.jdt.ui.classpathFixProcessors"
    >
      <classpathFixProcessor
       id=
    "MyClasspathFixProcessor"
    
       name=
    "My Classpath Fix Processor"
    
       class=
    "com.example.MyClasspathFixProcessor"
    >
       <enablement>
          <with variable=
    "project"
    >
       <test property=
    "org.eclipse.jdt.core.isInJavaProjectWithNature"
    
             value=
    "org.eclipse.pde.PluginNature"
    />
          </with>
       </enablement>
       <overrides
          id=
    "org.eclipse.jdt.ui.text.correction.DefaultClasspathFixProcessor"
    >
       </overrides>
      </classpathFixProcessor>
     </extension>
    
    


    Copyright (c) 2007, 2008 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 https://www.eclipse.org/legal/epl-v10.html


     
     
      Published under the terms of the Eclipse Public License Version 1.0 ("EPL") Design by Interspire