TclOverrideCompletionProposal.java

/*******************************************************************************
 * Copyright (c) 2000, 2017 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
 *
 *******************************************************************************/
package org.eclipse.dltk.tcl.internal.ui.text.completion;

import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.dltk.core.IScriptProject;
import org.eclipse.dltk.core.ISourceModule;
import org.eclipse.dltk.tcl.internal.ui.TclUI;
import org.eclipse.dltk.ui.PreferenceConstants;
import org.eclipse.dltk.ui.text.completion.ScriptTypeCompletionProposal;
import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.Document;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.contentassist.ContextInformation;
import org.eclipse.jface.text.contentassist.ICompletionProposalExtension4;
import org.eclipse.jface.text.contentassist.IContextInformation;

public class TclOverrideCompletionProposal extends ScriptTypeCompletionProposal
		implements ICompletionProposalExtension4 {

	private String methodName;

	public TclOverrideCompletionProposal(IScriptProject project,
			ISourceModule cu, String methodName, String[] paramTypes, int start,
			int length, String displayName, String completionProposal) {
		super(completionProposal, cu, start, length, null, displayName, 0);
		Assert.isNotNull(project);
		Assert.isNotNull(methodName);
		Assert.isNotNull(paramTypes);
		Assert.isNotNull(cu);

		this.methodName = methodName;

		setReplacementString(completionProposal);
	}

	@Override
	public CharSequence getPrefixCompletionText(IDocument document,
			int completionOffset) {
		return methodName;
	}

	@Override
	protected boolean updateReplacementString(IDocument document, char trigger,
			int offset) throws CoreException, BadLocationException {
		final IDocument buffer = new Document(document.get());
		int index = offset - 1;
		while (index >= 0
				&& Character.isJavaIdentifierPart(buffer.getChar(index)))
			index--;
		final int length = offset - index - 1;
		buffer.replace(index + 1, length, " "); //$NON-NLS-1$
		return true;
	}

	@Override
	public boolean isAutoInsertable() {
		return false;
	}

	@Override
	public IContextInformation getContextInformation() {
		return new ContextInformation(getDisplayString(), getDisplayString());
	}

	@Override
	protected boolean insertCompletion() {
		IPreferenceStore preference = TclUI.getDefault().getPreferenceStore();
		return preference
				.getBoolean(PreferenceConstants.CODEASSIST_INSERT_COMPLETION);
	}
}