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/** |
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$Id$ |
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Copyright (C) 2007 Nicklas Nordborg |
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This file is part of BASE - BioArray Software Environment. |
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Available at http://base.thep.lu.se/ |
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|
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BASE is free software; you can redistribute it and/or |
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modify it under the terms of the GNU General Public License |
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as published by the Free Software Foundation; either version 3 |
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of the License, or (at your option) any later version. |
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|
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BASE is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with BASE. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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package net.sf.basedb.util; |
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|
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import java.io.IOException; |
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import java.io.InputStream; |
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|
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/** |
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This class is used to keep track of the number of bytes read from the |
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underlying input stream. This is very useful for code that needs to |
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reporter progress but are having difficulties to know the number of |
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processed bytes. |
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|
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@author nicklas |
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@version 2.4 |
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@base.modified $Date$ |
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*/ |
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public class InputStreamTracker |
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extends InputStream |
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{ |
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|
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/** |
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The source input stream to read from. |
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*/ |
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private final InputStream in; |
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|
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/** |
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A scale factor to apply when counting bytes. |
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*/ |
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private final ScaleFactor scaleFactor; |
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|
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/** |
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The number of bytes that has been read from the underlying |
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input stream so far. |
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*/ |
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private long numRead; |
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|
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/** |
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The number of bytes that had been read when {@link #mark(int)} |
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was called. |
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*/ |
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private long numReadAtMark; |
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|
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/** |
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Create a new input stream tracker. |
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@param in The input stream to read from |
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*/ |
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public InputStreamTracker(InputStream in) |
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{ |
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this(in, null); |
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} |
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/** |
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Create a new input stream tracker. |
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@param in The input stream to read from |
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@param scaleFactor A scale factor to apply when counting bytes |
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@since 3.17.1 |
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*/ |
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public InputStreamTracker(InputStream in, ScaleFactor scaleFactor) |
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{ |
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if (in == null) throw new NullPointerException("in"); |
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this.in = in; |
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this.scaleFactor = scaleFactor == null ? new IdentityScaleFactor() : scaleFactor; |
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} |
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/* |
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From the InputStream class |
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------------------------------------------- |
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*/ |
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@Override |
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public int available() |
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throws IOException |
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{ |
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return in.available(); |
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} |
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@Override |
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public void close() |
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throws IOException |
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{ |
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in.close(); |
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} |
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@Override |
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public synchronized void mark(int readlimit) |
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{ |
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in.mark(readlimit); |
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this.numReadAtMark = numRead; |
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} |
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@Override |
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public boolean markSupported() |
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{ |
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return in.markSupported(); |
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} |
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@Override |
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public int read() |
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throws IOException |
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{ |
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int result = in.read(); |
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if (result != -1) ++numRead; |
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return result; |
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} |
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@Override |
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public int read(byte[] b, int off, int len) |
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throws IOException |
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{ |
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int result = in.read(b, off, len); |
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if (result > 0) numRead += result; |
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return result; |
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} |
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@Override |
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public int read(byte[] b) |
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throws IOException |
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{ |
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return read(b, 0, b.length); |
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} |
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@Override |
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public synchronized void reset() |
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throws IOException |
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{ |
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in.reset(); |
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numRead = numReadAtMark; |
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} |
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@Override |
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public long skip(long n) |
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throws IOException |
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{ |
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long result = in.skip(n); |
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if (result > 0) numRead += result; |
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return result; |
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} |
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// ------------------------------------------- |
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|
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/** |
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Get the number of bytes read or skipped from the input stream. |
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If the underlying stream supports {@link #reset()} this will also |
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reset the number of read bytes to the latest {@link #mark(int)} |
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position. |
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@return The number of bytes that has been read so far |
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*/ |
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public long getNumRead() |
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{ |
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return scaleFactor.scale(numRead); |
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} |
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|
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/** |
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A scale factor can be used to match number of read bytes to something |
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that better resembles actual progress. |
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@since 3.17.1 |
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*/ |
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public static interface ScaleFactor |
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{ |
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public long scale(long numRead); |
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} |
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|
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/** |
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Do not scale number of bytes. |
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*/ |
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public static class IdentityScaleFactor |
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implements ScaleFactor |
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{ |
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@Override |
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public long scale(long numRead) |
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{ |
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return numRead; |
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} |
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} |
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|
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/** |
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Apply a linear scale factor so that when we have read N actual bytes |
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the getNumRead() method return N*scale bytes. |
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*/ |
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public static class LinearScaleFactor |
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implements ScaleFactor |
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{ |
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private final float scale; |
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public LinearScaleFactor(float scale) |
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{ |
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this.scale = scale; |
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} |
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|
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@Override |
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public long scale(long numRead) |
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{ |
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return (long)(scale * numRead); |
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} |
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} |
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|
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/** |
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Apply a curved scale factor that has a max upper limit. To begin |
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with each byte is counted as 1, but the the more bytes that are read |
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the scale factor is changed along curved path so that we get closer |
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and closer to the max limit but never over. |
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*/ |
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public static class CurvedScaleFactor |
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implements ScaleFactor |
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{ |
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private final double max; |
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public CurvedScaleFactor(long max) |
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{ |
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this.max = max; |
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} |
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|
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@Override |
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public long scale(long numRead) |
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{ |
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return (long)(max * -Math.expm1(-numRead/max)); |
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} |
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} |
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} |