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package com.mbien.ant;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Task;
/**
* Keeps downloaded headers up2date.
* @author Michael Bien
*/
public class HeaderFileDownloader extends Task {
private String filePath;
private String urlStr;
/*example: $Revision: 9283 $ on $Date: 2009-10-14 10:18:57 -0700 (Wed, 14 Oct 2009) $ */
private final Pattern revisionPattern = Pattern.compile("\\$Revision:\\s(\\d+)");
@Override
public void execute() throws BuildException {
if(filePath == null)
throw new IllegalArgumentException("file must be set");
if(urlStr == null)
throw new IllegalArgumentException("update url must be set");
try {
URL url = new URL(urlStr);
int remoteRevision = readRevision(url.openStream());
int localRevision = readRevision(new FileInputStream(new File(filePath)));
if(remoteRevision != localRevision) {
System.out.println("updating header: "+filePath);
System.out.println("from revision "+localRevision +" to revision "+remoteRevision);
BufferedInputStream in = new BufferedInputStream(url.openStream());
BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(filePath));
int val;
while((val=in.read()) != -1) {
out.write(val);
}
in.close();
out.flush();
out.close();
}else{
System.out.println("header "+filePath+" is up to date");
}
} catch (IOException ex) {
throw new BuildException(ex);
}finally{
}
}
private int readRevision(InputStream is) throws IOException {
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
String line = null;
try {
while ((line = reader.readLine()) != null) {
Matcher matcher = revisionPattern.matcher(line);
if(matcher.find()) {
System.out.println(line);
return Integer.parseInt(matcher.group(1));
}
}
} finally {
reader.close();
}
return 0;
}
public void setURL(String url) {
this.urlStr = url;
}
public void setHeader(String filePath) {
this.filePath = filePath;
}
}
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