GenericTypeCompletionProposal.java

/*******************************************************************************
 * Copyright (c) 2011 NumberFour AG
 *
 * 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:
 *     NumberFour AG - initial API and Implementation (Alex Panchenko)
 *******************************************************************************/
package org.eclipse.dltk.javascript.internal.ui.text.completion;

import java.util.List;

import org.eclipse.dltk.core.CompletionProposal;
import org.eclipse.dltk.javascript.typeinfo.model.GenericType;
import org.eclipse.dltk.javascript.typeinfo.model.TypeVariable;
import org.eclipse.dltk.ui.DLTKUIPlugin;
import org.eclipse.dltk.ui.text.completion.ICompletionProposalInfo;
import org.eclipse.dltk.ui.text.completion.IScriptCompletionProposalExtension2;
import org.eclipse.dltk.ui.text.completion.LinkedModeScriptCompletionProposal;
import org.eclipse.dltk.ui.text.completion.ReplacementBuffer;
import org.eclipse.dltk.ui.text.completion.ScriptContentAssistInvocationContext;
import org.eclipse.jface.text.IDocument;
import org.eclipse.swt.graphics.Image;

/**
 * @since 4.0
 */
public class GenericTypeCompletionProposal extends
		LinkedModeScriptCompletionProposal implements
		IScriptCompletionProposalExtension2 {
	/**
	 * Triggers for method proposals. Do not modify.
	 */
	protected final static char[] TYPE_TRIGGERS = new char[] { '<', ' ' };

	public GenericTypeCompletionProposal(CompletionProposal proposal,
			ScriptContentAssistInvocationContext context) {
		super(proposal, context);
	}

	public String getName() {
		return fProposal.getName();
	}

	@Override
	public CharSequence getPrefixCompletionText(IDocument document,
			int completionOffset) {
		String completion = String.valueOf(fProposal.getName());
		if (isCamelCaseMatching()) {
			String prefix = getPrefix(document, completionOffset);
			return getCamelCaseCompound(prefix, completion);
		}
		return completion;
	}

	@Override
	protected char[] computeTriggerCharacters() {
		return TYPE_TRIGGERS;
	}

	@Override
	protected char getOpenTrigger() {
		return '<';
	}

	@Override
	protected char getExitTrigger() {
		return '>';
	}

	@Override
	protected void computeReplacement(ReplacementBuffer buffer) {
		buffer.append(fProposal.getName());
		buffer.append("<");
		setCursorPosition(buffer.length());
		final GenericType genericType = (GenericType) fProposal.getExtraInfo();
		final List<TypeVariable> variables = genericType.getTypeParameters();
		for (int i = 0; i < variables.size(); ++i) {
			if (i != 0) {
				buffer.append(COMMA);
			}
			buffer.addArgument(variables.get(i).getName());
		}
		buffer.append(">");
	}

	@Override
	protected ICompletionProposalInfo computeProposalInfo() {
		return new JavaScriptProposalInfo(fProposal.getExtraInfo());
	}

	@Override
	protected Image computeImage() {
		return DLTKUIPlugin.getImageDescriptorRegistry().get(
				fInvocationContext.getLabelProvider()
						.createTypeImageDescriptor(fProposal));
	}

}