new directory structure

org_apg/src/org/apg/DataDestination.java

@@ -0,0 +1,81 @@
+package org.apg;
+
+import java.io.ByteArrayOutputStream;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+
+import org.apg.Apg.GeneralException;
+import org.apg.R;
+
+import android.content.Context;
+import android.os.Environment;
+
+public class DataDestination {
+    private String mStreamFilename;
+    private String mFilename;
+    private int mMode = Id.mode.undefined;
+
+    public DataDestination() {
+
+    }
+
+    public void setMode(int mode) {
+        mMode = mode;
+    }
+
+    public void setFilename(String filename) {
+        mFilename = filename;
+    }
+
+    public String getStreamFilename() {
+        return mStreamFilename;
+    }
+
+    public OutputStream getOutputStream(Context context) throws Apg.GeneralException,
+            FileNotFoundException, IOException {
+        OutputStream out = null;
+        mStreamFilename = null;
+
+        switch (mMode) {
+        case Id.mode.stream: {
+            try {
+                while (true) {
+                    mStreamFilename = Apg.generateRandomString(32);
+                    if (mStreamFilename == null) {
+                        throw new Apg.GeneralException("couldn't generate random file name");
+                    }
+                    context.openFileInput(mStreamFilename).close();
+                }
+            } catch (FileNotFoundException e) {
+                // found a name that isn't used yet
+            }
+            out = context.openFileOutput(mStreamFilename, Context.MODE_PRIVATE);
+            break;
+        }
+
+        case Id.mode.byte_array: {
+            out = new ByteArrayOutputStream();
+            break;
+        }
+
+        case Id.mode.file: {
+            if (mFilename.startsWith(Environment.getExternalStorageDirectory().getAbsolutePath())) {
+                if (!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
+                    throw new GeneralException(
+                            context.getString(R.string.error_externalStorageNotReady));
+                }
+            }
+            out = new FileOutputStream(mFilename);
+            break;
+        }
+
+        default: {
+            break;
+        }
+        }
+
+        return out;
+    }
+}