altoslib: Make AltosPreferencesBackend abstract. Add set/put Serializable

[fw/altos] / altoslib / AltosPreferencesBackend.java

diff --git a/altoslib/AltosPreferencesBackend.java b/altoslib/AltosPreferencesBackend.java
index 9f2e8f7c9541bf0945fd9291ca37701181fedc44..6e1124e24e5462574c431d841000bf680222cdc6 100644 (file)
--- a/altoslib/AltosPreferencesBackend.java
+++ b/altoslib/AltosPreferencesBackend.java
@@ -17,34 +17,72 @@
 
 package org.altusmetrum.altoslib_10;
 
-import java.io.File;
+import java.io.*;
+import java.util.*;
+import java.text.*;
 
-public interface AltosPreferencesBackend {
+public abstract class AltosPreferencesBackend {
 
-       public String  getString(String key, String def);
-       public void    putString(String key, String value);
+       public abstract String  getString(String key, String def);
+       public abstract void    putString(String key, String value);
 
-       public int     getInt(String key, int def);
-       public void    putInt(String key, int value);
+       public abstract int     getInt(String key, int def);
+       public abstract void    putInt(String key, int value);
 
-       public double  getDouble(String key, double def);
-       public void    putDouble(String key, double value);
+       public abstract double  getDouble(String key, double def);
+       public abstract void    putDouble(String key, double value);
 
-       public boolean getBoolean(String key, boolean def);
-       public void    putBoolean(String key, boolean value);
+       public abstract boolean getBoolean(String key, boolean def);
+       public abstract void    putBoolean(String key, boolean value);
 
-       public byte[]  getBytes(String key, byte[] def);
-       public void    putBytes(String key, byte[] value);
+       public abstract byte[]  getBytes(String key, byte[] def);
+       public abstract void    putBytes(String key, byte[] value);
 
-       public boolean nodeExists(String key);
-       public AltosPreferencesBackend node(String key);
+       public Serializable getSerializable(String key, Serializable def) {
+               byte[] bytes = null;
 
-       public String[] keys();
-       public void    remove(String key);
+               bytes = getBytes(key, null);
+               if (bytes == null)
+                       return def;
 
-       public void    flush();
+               ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
 
-       public File homeDirectory();
+               try {
+                       ObjectInputStream ois = new ObjectInputStream(bais);
+                       Serializable object = (Serializable) ois.readObject();
+                       return object;
+               } catch (IOException ie) {
+                       debug("IO exception %s\n", ie.toString());
+               } catch (ClassNotFoundException ce) {
+                       debug("ClassNotFoundException %s\n", ce.toString());
+               }
+               return def;
+       }
 
-       public void debug(String format, Object ... arguments);
+       public void putSerializable(String key, Serializable object) {
+               ByteArrayOutputStream baos = new ByteArrayOutputStream();
+
+               try {
+                       ObjectOutputStream oos = new ObjectOutputStream(baos);
+
+                       oos.writeObject(object);
+                       byte[] bytes = baos.toByteArray();
+
+                       putBytes(key, bytes);
+               } catch (IOException ie) {
+                       debug("set_state failed %s\n", ie.toString());
+               }
+       }
+
+       public abstract boolean nodeExists(String key);
+       public abstract AltosPreferencesBackend node(String key);
+
+       public abstract String[] keys();
+       public abstract void    remove(String key);
+
+       public abstract void    flush();
+
+       public abstract File homeDirectory();
+
+       public abstract void debug(String format, Object ... arguments);
 }