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/*******************************************************************************
* Copyright (c) 2000, 2003 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jface.text.information;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITextViewer;
/**
* Provides information related to the content of a text viewer.<p>
* Clients may implement this interface.
*
* @see ITextViewer
* @since 2.0
*/
public interface IInformationProvider {
/**
* Returns the region of the text viewer's document close to the given
* offset that contains a subject about which information can be provided.<p>
* For example, if information can be provided on a per code block basis,
* the offset should be used to find the enclosing code block and the source
* range of the block should be returned.
*
* @param textViewer the text viewer in which informationhas been requested
* @param offset the offset at which information has been requested
* @return the region of the text viewer's document containing the information subject
*/
IRegion getSubject(ITextViewer textViewer, int offset);
/**
* Returns the information about the given subject or <code>null</code> if
* no information is available. It depends on the concrete configuration in which
* format the information is to be provided. For example, information presented
* in an information control displaying HTML, should be provided in HTML.
*
* @param textViewer the viewer in whose document the subject is contained
* @param subject the text region constituting the information subject
* @return the information about the subject
* @see IInformationPresenter
* @deprecated As of 2.1, replaced by {@link IInformationProviderExtension#getInformation2(ITextViewer, IRegion)}
*/
String getInformation(ITextViewer textViewer, IRegion subject);
}
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