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/* zipdiff is available under the terms of the

* Apache License, version 2.0

*

* Link: http://www.apache.org/licenses/

*/

package zipdiff.output;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.OutputStream;

import zipdiff.Differences;

/**

* abstract base class for Builders.

*

* @author Sean C. Sullivan, Hendrik Brummermann

*/

public abstract class AbstractBuilder implements Builder {

/** number of directory prefixes to skip in the output file */

protected int numberOfOutputPrefixesToSkip;

/**

* builds the output

*

* @param filename name of output file

* @param numberOfPrefixesToSkip number of directory prefixes to skip

* @param d differences

* @throws IOException in case of an input/output error

*/

public void build(String filename, int numberOfPrefixesToSkip, Differences d) throws IOException {

this.numberOfOutputPrefixesToSkip = numberOfPrefixesToSkip;

OutputStream os = null;

if ((filename == null) || filename.equals("-")) {

os = System.out;

} else {

os = new FileOutputStream(filename);

}

build(os, d);

os.flush();

}

/**

* builds the output

*

* @param out OutputStream to write to

* @param d differences

*/

public abstract void build(OutputStream out, Differences d);

}