org.eclipse.jdt.core
Class CompletionRequestor

java.lang.Object
  org.eclipse.jdt.core.CompletionRequestor

Direct Known Subclasses:

CompletionRequestorWrapper, CompletionTestsRequestor, CompletionTestsRequestor2

public abstract class CompletionRequestor
extends java.lang.Object

Abstract base class for a completion requestor which is passed completion proposals as they are generated in response to a code assist request.

This class is intended to be subclassed by clients.

The code assist engine normally invokes methods on completion requestor in the following sequence:

 requestor.beginReporting();
 requestor.acceptContext(context);
 requestor.accept(proposal_1);
 requestor.accept(proposal_2);
 ...
 requestor.endReporting();
 

If, however, the engine is unable to offer completion proposals for whatever reason, completionFailure is called with a problem object describing why completions were unavailable. In this case, the sequence of calls is:

 requestor.beginReporting();
 requestor.acceptContext(context);
 requestor.completionFailure(problem);
 requestor.endReporting();
 

In either case, the bracketing beginReporting endReporting calls are always made as well as acceptContext call.

The class was introduced in 3.0 as a more evolvable replacement for the ICompletionRequestor interface.

Since:

3.0

See Also:

ICodeAssist

Constructor Summary

CompletionRequestor()
Creates a new completion requestor.

CompletionRequestor(boolean ignoreAll)
Creates a new completion requestor.

Method Summary

abstract void	accept(CompletionProposal proposal) Proposes a completion.
void	acceptContext(CompletionContext context) Propose the context in which the completion occurs.
void	beginReporting() Pro forma notification sent before reporting a batch of completion proposals.
void	completionFailure(IProblem problem) Notification of failure to produce any completions.
void	endReporting() Pro forma notification sent after reporting a batch of completion proposals.
java.lang.String[]	getFavoriteReferences() Returns the favorite references which are used to compute some completion proposals.
boolean	isAllowingRequiredProposals(int proposalKind, int requiredProposalKind) Returns whether a proposal of a given kind with a required proposal of the given kind is allowed.
boolean	isExtendedContextRequired() Returns whether this requestor requires an extended context.
boolean	isIgnored(int completionProposalKind) Returns whether the given kind of completion proposal is ignored.
void	setAllowsRequiredProposals(int proposalKind, int requiredProposalKind, boolean allow) Sets whether a proposal of a given kind with a required proposal of the given kind is allowed.
void	setFavoriteReferences(java.lang.String[] favoriteImports) Set the favorite references which will be used to compute some completion proposals.
void	setIgnored(int completionProposalKind, boolean ignore) Sets whether the given kind of completion proposal is ignored.
void	setRequireExtendedContext(boolean require) Sets whether this requestor requires an extended context.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

CompletionRequestor

public CompletionRequestor()

Creates a new completion requestor. The requestor is interested in all kinds of completion proposals; none will be ignored. Calls to this constructor are identical to calls to CompletionRequestor(false)

CompletionRequestor

public CompletionRequestor(boolean ignoreAll)

Creates a new completion requestor. If ignoreAll is true the requestor is not interested in all kinds of completion proposals; all will be ignored. For each kind of completion proposals that is of interest, setIgnored(kind, false) must be called. If ignoreAll is false the requestor is interested in all kinds of completion proposals; none will be ignored.

Parameters:

ignoreAll - true to ignore all kinds of completion proposals, and false to propose all kinds

Since:

3.4

Method Detail

isIgnored

public boolean isIgnored(int completionProposalKind)

Returns whether the given kind of completion proposal is ignored.

Parameters:

completionProposalKind - one of the kind constants declared on CompletionProposal

Returns:

true if the given kind of completion proposal is ignored by this requestor, and false if it is of interest

See Also:

setIgnored(int, boolean), CompletionProposal.getKind()

setIgnored

public void setIgnored(int completionProposalKind,
                       boolean ignore)

Sets whether the given kind of completion proposal is ignored.

Parameters:

completionProposalKind - one of the kind constants declared on CompletionProposal

ignore - true if the given kind of completion proposal is ignored by this requestor, and false if it is of interest

See Also:

isIgnored(int), CompletionProposal.getKind()

isAllowingRequiredProposals

public boolean isAllowingRequiredProposals(int proposalKind,
                                           int requiredProposalKind)

Returns whether a proposal of a given kind with a required proposal of the given kind is allowed.

Parameters:

proposalKind - one of the kind constants declared

requiredProposalKind - one of the kind constants declared on CompletionProposal

Returns:

true if a proposal of a given kind with a required proposal of the given kind is allowed by this requestor, and false if it isn't of interest.

By default, all kinds of required proposals aren't allowed.

Since:

3.3

See Also:

setAllowsRequiredProposals(int, int, boolean), CompletionProposal.getKind(), CompletionProposal.getRequiredProposals()

setAllowsRequiredProposals

public void setAllowsRequiredProposals(int proposalKind,
                                       int requiredProposalKind,
                                       boolean allow)

Sets whether a proposal of a given kind with a required proposal of the given kind is allowed. A required proposal of a given kind is proposed even if isIgnored(int) return true for that kind. Currently only a subset of kinds support required proposals. To see what combinations are supported you must look at CompletionProposal.getRequiredProposals() documentation.

Parameters:

proposalKind - one of the kind constants declared

requiredProposalKind - one of the kind constants declared on CompletionProposal

allow - true if a proposal of a given kind with a required proposal of the given kind is allowed by this requestor, and false if it isn't of interest

Since:

3.3

See Also:

isAllowingRequiredProposals(int, int), CompletionProposal.getKind(), CompletionProposal.getRequiredProposals()

getFavoriteReferences

public java.lang.String[] getFavoriteReferences()

Returns the favorite references which are used to compute some completion proposals.

A favorite reference is a qualified reference as it can be seen in an import statement.
e.g. {"java.util.Arrays"}
It can be an on demand reference.
e.g. {"java.util.Arrays.*"} It can be a reference to a static method or field (as in a static import)
e.g. {"java.util.Arrays.equals"}

Currently only on demand type references ("java.util.Arrays.*"), references to a static method or a static field are used to compute completion proposals. Other kind of reference could be used in the future.

Returns:

favorite imports

Since:

3.3

setFavoriteReferences

public void setFavoriteReferences(java.lang.String[] favoriteImports)

Set the favorite references which will be used to compute some completion proposals. A favorite reference is a qualified reference as it can be seen in an import statement.

Parameters:

favoriteImports -

Since:

3.3

See Also:

getFavoriteReferences()

beginReporting

public void beginReporting()

Pro forma notification sent before reporting a batch of completion proposals.

The default implementation of this method does nothing. Clients may override.

endReporting

public void endReporting()

Pro forma notification sent after reporting a batch of completion proposals.

The default implementation of this method does nothing. Clients may override.

completionFailure

public void completionFailure(IProblem problem)

Notification of failure to produce any completions. The problem object explains what prevented completing.

The default implementation of this method does nothing. Clients may override to receive this kind of notice.

Parameters:

problem - the problem object

accept

public abstract void accept(CompletionProposal proposal)

Proposes a completion. Has no effect if the kind of proposal is being ignored by this requestor. Callers should consider checking isIgnored(int) before avoid creating proposal objects that would only be ignored.

Similarly, implementers should check isIgnored(proposal.getKind()) and ignore proposals that have been declared as uninteresting. The proposal object passed is only valid for the duration of completion operation.

Parameters:

proposal - the completion proposal

Throws:

java.lang.IllegalArgumentException - if the proposal is null

acceptContext

public void acceptContext(CompletionContext context)

Propose the context in which the completion occurs.

This method is called one and only one time before any call to accept(CompletionProposal). The default implementation of this method does nothing. Clients may override.

Parameters:

context - the completion context

Since:

3.1

isExtendedContextRequired

public boolean isExtendedContextRequired()

Returns whether this requestor requires an extended context. By default this method return false.

Returns:

true if this requestor requires an extended context.

Since:

3.4

See Also:

CompletionContext.isExtended()

setRequireExtendedContext

public void setRequireExtendedContext(boolean require)

Sets whether this requestor requires an extended context.

Parameters:

require - true if this requestor requires an extended context.

Since:

3.4

See Also:

CompletionContext.isExtended()