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/*
* DiffOutput.java
* Copyright (c) 2001 Andre Kaplan
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
package jdiff.util;
import java.io.IOException;
import java.io.Writer;
import java.io.OutputStreamWriter;
/** A base class for printing edit scripts produced by Diff. */
public abstract class DiffOutput {
/** Set to the lines of the files being compared. */
protected Object[] file0;
protected Object[] file1;
protected String lineSeparator;
protected Writer out;
protected DiffOutput(Object[] a,Object[] b) {
this.lineSeparator = System.getProperty("java.line.separator");
this.out = new OutputStreamWriter(System.out);
this.file0 = a;
this.file1 = b;
}
public void setOut(Writer out) {
this.out = out;
}
public void setLineSeparator(String lineSeparator) {
this.lineSeparator = lineSeparator;
}
abstract public void writeScript(Diff.change script) throws IOException;
protected void writeLine(String prefix, Object line) throws IOException {
out.write(prefix + line.toString() + this.lineSeparator);
}
/** Write a pair of line numbers separated with sepChar.
If the two numbers are identical, print just one number.
Args a and b are internal line numbers (ranging from 0)
We write the translated (real) line numbers ranging from 1).
*/
protected void writeNumberRange(char sepChar, int a, int b) throws IOException {
/* Note: we can have b < a in the case of a range of no lines.
In this case, we should write the line number before the range,
which is b. */
if (++b > ++a) {
out.write(Integer.toString(a));
out.write(sepChar);
out.write(Integer.toString(b));
} else {
out.write(Integer.toString(b));
}
}
public static char changeLetter(int inserts, int deletes) {
if (inserts == 0) {
return 'd';
} else if (deletes == 0) {
return 'a';
} else {
return 'c';
}
}
}
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