1 files changed, 100 insertions, 0 deletions
diff --git a/etc/src/com/mbien/ant/HeaderFileDownloader.java b/etc/src/com/mbien/ant/HeaderFileDownloader.java
new file mode 100644
index 0000000..5177b90
--- /dev/null
+++ b/etc/src/com/mbien/ant/HeaderFileDownloader.java
@@ -0,0 +1,100 @@
+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;
+    }
+
+
+}