| /******************************************************************************* |
| * Copyright (c) 2004, 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 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jdt.core; |
| |
| import org.eclipse.jdt.core.compiler.IProblem; |
| |
| /** |
| * Abstract base class for a completion requestor which is passed completion |
| * proposals as they are generated in response to a code assist request. |
| * <p> |
| * This class is intended to be subclassed by clients. |
| * </p> |
| * <p> |
| * The code assist engine normally invokes methods on completion |
| * requestors in the following sequence: |
| * <pre> |
| * requestor.beginReporting(); |
| * requestor.acceptContext(context); |
| * requestor.accept(proposal_1); |
| * requestor.accept(proposal_2); |
| * ... |
| * requestor.endReporting(); |
| * </pre> |
| * If, however, the engine is unable to offer completion proposals |
| * for whatever reason, <code>completionFailure</code> is called |
| * with a problem object describing why completions were unavailable. |
| * In this case, the sequence of calls is: |
| * <pre> |
| * requestor.beginReporting(); |
| * requestor.acceptContext(context); |
| * requestor.completionFailure(problem); |
| * requestor.endReporting(); |
| * </pre> |
| * In either case, the bracketing <code>beginReporting</code> |
| * <code>endReporting</code> calls are always made as well as |
| * <code>acceptContext</code> call. |
| * </p> |
| * <p> |
| * The class was introduced in 3.0 as a more evolvable replacement |
| * for the <code>ICompletionRequestor</code> interface. |
| * </p> |
| * |
| * @see ICodeAssist |
| * @since 3.0 |
| */ |
| public abstract class CompletionRequestor { |
| |
| /** |
| * The set of CompletionProposal kinds that this requestor |
| * ignores; <code>0</code> means the set is empty. |
| * 1 << completionProposalKind |
| */ |
| private int ignoreSet = 0; |
| |
| /** |
| * Creates a new completion requestor. |
| * The requestor is interested in all kinds of completion |
| * proposals; none will be ignored. |
| */ |
| public CompletionRequestor() { |
| // do nothing |
| } |
| |
| /** |
| * Returns whether the given kind of completion proposal is ignored. |
| * |
| * @param completionProposalKind one of the kind constants declared |
| * on <code>CompletionProposal</code> |
| * @return <code>true</code> if the given kind of completion proposal |
| * is ignored by this requestor, and <code>false</code> if it is of |
| * interest |
| * @see #setIgnored(int, boolean) |
| * @see CompletionProposal#getKind() |
| */ |
| public final boolean isIgnored(int completionProposalKind) { |
| if (completionProposalKind < CompletionProposal.FIRST_KIND |
| || completionProposalKind > CompletionProposal.LAST_KIND) { |
| throw new IllegalArgumentException(); |
| } |
| return 0 != (this.ignoreSet & (1 << completionProposalKind)); |
| } |
| |
| /** |
| * Sets whether the given kind of completion proposal is ignored. |
| * |
| * @param completionProposalKind one of the kind constants declared |
| * on <code>CompletionProposal</code> |
| * @param ignore <code>true</code> if the given kind of completion proposal |
| * is ignored by this requestor, and <code>false</code> if it is of |
| * interest |
| * @see #isIgnored(int) |
| * @see CompletionProposal#getKind() |
| */ |
| public final void setIgnored(int completionProposalKind, boolean ignore) { |
| if (completionProposalKind < CompletionProposal.FIRST_KIND |
| || completionProposalKind > CompletionProposal.LAST_KIND) { |
| throw new IllegalArgumentException(); |
| } |
| if (ignore) { |
| this.ignoreSet |= (1 << completionProposalKind); |
| } else { |
| this.ignoreSet &= ~(1 << completionProposalKind); |
| } |
| } |
| |
| /** |
| * Pro forma notification sent before reporting a batch of |
| * completion proposals. |
| * <p> |
| * The default implementation of this method does nothing. |
| * Clients may override. |
| * </p> |
| */ |
| public void beginReporting() { |
| // do nothing |
| } |
| |
| /** |
| * Pro forma notification sent after reporting a batch of |
| * completion proposals. |
| * <p> |
| * The default implementation of this method does nothing. |
| * Clients may override. |
| * </p> |
| */ |
| public void endReporting() { |
| // do nothing |
| } |
| |
| /** |
| * Notification of failure to produce any completions. |
| * The problem object explains what prevented completing. |
| * <p> |
| * The default implementation of this method does nothing. |
| * Clients may override to receive this kind of notice. |
| * </p> |
| * |
| * @param problem the problem object |
| */ |
| public void completionFailure(IProblem problem) { |
| // default behavior is to ignore |
| } |
| |
| /** |
| * Proposes a completion. Has no effect if the kind of proposal |
| * is being ignored by this requestor. Callers should consider |
| * checking {@link #isIgnored(int)} before avoid creating proposal |
| * objects that would only be ignored. |
| * <p> |
| * Similarly, implementers should check |
| * {@link #isIgnored(int) 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. |
| * |
| * @param proposal the completion proposal |
| * @exception IllegalArgumentException if the proposal is null |
| */ |
| public abstract void accept(CompletionProposal proposal); |
| |
| /** |
| * Propose the context in which the completion occurs. |
| * <p> |
| * This method is called one and only one time before any call to |
| * {@link #accept(CompletionProposal)}. |
| * The default implementation of this method does nothing. |
| * Clients may override. |
| * </p> |
| * @param context the completion context |
| * |
| * @since 3.1 |
| */ |
| public void acceptContext(CompletionContext context) { |
| // do nothing |
| } |
| } |