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/*******************************************************************************
* Copyright (c) 2000, 2004 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.compare.structuremergeviewer;
import org.eclipse.swt.graphics.Image;
import org.eclipse.compare.ITypedElement;
/**
* An abstract base implementation of the <code>IDiffElement</code> interface.
* <p>
* Subclasses may add behavior and state, and may override <code>getImage</code>
* and <code>getType</code> to suit.
* </p>
*/
public abstract class DiffElement implements IDiffElement {
private int fKind;
private IDiffContainer fParent;
/**
* Creates a new <code>DiffElement</code> as a child of the given parent.
* If parent is not <code>null</code> the new element is added to the parent.
*
* @param parent the parent of this child; if not <code>null</code> this element is automatically added as a child
* @param kind the kind of change
*/
public DiffElement(IDiffContainer parent, int kind) {
fParent= parent;
fKind= kind;
if (parent != null)
parent.add(this);
}
/**
* The <code>DiffElement</code> implementation of this <code>ITypedInput</code>
* method returns <code>null</code>. Subclasses may re-implement to provide
* an image for this element.
* @return <code>null</code>.
*/
public Image getImage() {
return null;
}
/**
* The <code>DiffElement</code> implementation of this <code>ITypedElement</code>
* method returns <code>ITypedElement.UNKNOWN_TYPE</code>. Subclasses may
* re-implement to provide a type for this element.
* @return <code>ITypedElement.UNKNOWN_TYPE</code>.
*/
public String getType() {
return ITypedElement.UNKNOWN_TYPE;
}
/**
* Sets the kind of difference for this element.
*
* @param kind set the kind of difference this element represents
* @see Differencer
*/
public void setKind(int kind) {
fKind= kind;
}
/* (non Javadoc)
* see IDiffElement.getKind
*/
public int getKind() {
return fKind;
}
/* (non Javadoc)
* see IDiffElement.getParent
*/
public IDiffContainer getParent() {
return fParent;
}
/* (non Javadoc)
* see IDiffElement.setParent
*/
public void setParent(IDiffContainer parent) {
fParent= parent;
}
}
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