* i2psnark: Add file priority feature;

Use context random for shuffle; other cleanups

apps/i2psnark/java/src/org/klomp/snark/Piece.java

@@ -1,22 +1,31 @@
 package org.klomp.snark;
 
 import java.util.Collections;
-import java.util.HashSet;
 import java.util.Set;
 
+import net.i2p.util.ConcurrentHashSet;
+
 public class Piece implements Comparable {
 
     private int id;
-    private Set peers;
+    private Set<PeerID> peers;
     private boolean requested;
+    /** @since 0.8.1 */
+    private int priority;
     
     public Piece(int id) {
         this.id = id;
-        this.peers = Collections.synchronizedSet(new HashSet());
-        this.requested = false;
+        this.peers = new ConcurrentHashSet();
     }
     
+    /**
+     *  Highest priority first,
+     *  then rarest first
+     */
     public int compareTo(Object o) throws ClassCastException {
+        int pdiff = ((Piece)o).priority - this.priority;   // reverse
+        if (pdiff != 0)
+            return pdiff;
         return this.peers.size() - ((Piece)o).peers.size();
     }
     
@@ -37,12 +46,25 @@ public class Piece implements Comparable {
     }
     
     public int getId() { return this.id; }
-    public Set getPeers() { return this.peers; }
+    /** @deprecated unused */
+    public Set<PeerID> getPeers() { return this.peers; }
     public boolean addPeer(Peer peer) { return this.peers.add(peer.getPeerID()); }
     public boolean removePeer(Peer peer) { return this.peers.remove(peer.getPeerID()); }
     public boolean isRequested() { return this.requested; }
     public void setRequested(boolean requested) { this.requested = requested; } 
     
+    /** @return default 0 @since 0.8.1 */
+    public int getPriority() { return this.priority; }
+
+    /** @since 0.8.1 */
+    public void setPriority(int p) { this.priority = p; }
+
+    /** @since 0.8.1 */
+    public boolean isDisabled() { return this.priority < 0; }
+
+    /** @since 0.8.1 */
+    public void setDisabled() { this.priority = -1; }
+
     @Override
     public String toString() {
         return String.valueOf(id);