Added FileAsyncHttpResponseHandler, Closes android-async-http#134

Author: smarek

library/src/com/loopj/android/http/FileAsyncHttpResponseHandler.java

@@ -0,0 +1,96 @@
+package com.loopj.android.http;
+
+import android.os.Message;
+
+import org.apache.http.HttpResponse;
+import org.apache.http.StatusLine;
+import org.apache.http.client.HttpResponseException;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+
+public class FileAsyncHttpResponseHandler extends AsyncHttpResponseHandler {
+
+    private File mFile;
+
+    public FileAsyncHttpResponseHandler(File file) {
+        super();
+        this.mFile = file;
+    }
+
+    public void onSuccess(File file) {
+    }
+
+    public void onSuccess(int statusCode, File file) {
+        onSuccess(file);
+    }
+
+    public void onFailure(Throwable e, File response) {
+    }
+
+
+    protected void sendSuccessMessage(int statusCode, File file) {
+        sendMessage(obtainMessage(SUCCESS_MESSAGE, new Object[]{statusCode, file}));
+    }
+
+    protected void sendFailureMessage(Throwable e, File file) {
+        sendMessage(obtainMessage(FAILURE_MESSAGE, new Object[]{e, file}));
+    }
+
+    protected void handleSuccessMessage(int statusCode, File responseBody) {
+        onSuccess(statusCode, responseBody);
+    }
+
+    protected void handleFailureMessage(Throwable e, File responseBody) {
+        onFailure(e, responseBody);
+    }
+
+    // Methods which emulate android's Handler and Message methods
+    protected void handleMessage(Message msg) {
+        Object[] response;
+        switch (msg.what) {
+            case SUCCESS_MESSAGE:
+                response = (Object[]) msg.obj;
+                handleSuccessMessage(((Integer) response[0]).intValue(), (File) response[1]);
+                break;
+            case FAILURE_MESSAGE:
+                response = (Object[]) msg.obj;
+                handleFailureMessage((Throwable) response[0], (File) response[1]);
+                break;
+            default:
+                super.handleMessage(msg);
+                break;
+        }
+    }
+
+    @Override
+    protected void sendResponseMessage(HttpResponse response) {
+        StatusLine status = response.getStatusLine();
+
+        try {
+            FileOutputStream buffer = new FileOutputStream(this.mFile);
+            InputStream is = response.getEntity().getContent();
+
+            int nRead;
+            byte[] data = new byte[16384];
+
+            while ((nRead = is.read(data, 0, data.length)) != -1)
+                buffer.write(data, 0, nRead);
+
+            buffer.flush();
+            buffer.close();
+
+        } catch (IOException e) {
+            sendFailureMessage(e, this.mFile);
+        }
+
+        if (status.getStatusCode() >= 300) {
+            sendFailureMessage(new HttpResponseException(status.getStatusCode(), status.getReasonPhrase()), this.mFile);
+        } else {
+            sendSuccessMessage(status.getStatusCode(), this.mFile);
+        }
+    }
+}