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The source code

/*
 *                 Sun Public License Notice
 * 
 * The contents of this file are subject to the Sun Public License
 * Version 1.0 (the "License"). You may not use this file except in
 * compliance with the License. A copy of the License is available at
 * http://www.sun.com/
 * 
 * The Original Code is NetBeans. The Initial Developer of the Original
 * Code is Sun Microsystems, Inc. Portions Copyright 1997-2002 Sun
 * Microsystems, Inc. All Rights Reserved.
 */

package org.netbeans.spi.diff;

import java.io.IOException;
import java.io.Reader;

//import org.openide.util.Lookup;

import org.netbeans.api.diff.Difference;

/**
 * This class represents a provider of diff algorithm. The implementing class
 * should calculate differences between two sources.
 * 

The registered Diff Providers can be obtained via {@link org.openide.util.Lookup} * (e.g. you can get the default diff provider by * Lookup.getDefault().lookup(DiffProvider.class)) * * @author Martin Entlicher */ public abstract class DiffProvider extends Object { /* public static DiffProvider getDefault() { return (DiffProvider) Lookup.getDefault().lookup(DiffProvider.class); } */ /** * Create the differences of the content two streams. * @param r1 the first source * @param r2 the second source to be compared with the first one. * @return the list of differences found, instances of {@link Difference}; * or null when some error occured. * @throws IOException when the reading from input streams fails. */ public abstract Difference[] computeDiff(Reader r1, Reader r2) throws IOException; }

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