60 lines
2.1 KiB
Java
60 lines
2.1 KiB
Java
/* Added by David Chandler, based on stuff in this package. */
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/*
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*
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* Copyright (c) 2001 Torgeir Veimo
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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*/
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package org.thdl.util.javaxdelta;
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import java.util.*;
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import java.io.*;
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/** We look to see that one special DATA statement and only one COPY statment
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are generated. If so, there's no difference between the input and
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the output. Otherwise there is.
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@author David Chandler */
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public class YesOrNoDiffWriter implements DiffWriter {
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public YesOrNoDiffWriter() {}
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private int numCopies = 0;
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private int numDatas = 0;
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public void addCopy(int offset, int length) throws IOException {
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if (numCopies == 1) numCopies = 2;
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if (numCopies == 0) numCopies = 1;
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}
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public void addData(byte b) throws IOException {
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if (numDatas == 1) numDatas = 2;
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if (numDatas == 0) numDatas = 1;
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}
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public boolean areFilesDifferent() {
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return numCopies != 1 || numDatas != 1;
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}
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private void writeBuf() { }
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public void flush() throws IOException { }
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public void close() throws IOException { }
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}
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