New command for signs, closes #79

A new command for signs. Refreshing them, cleaning them, and verifying
them. Changed up some internal apis, if you were using them sorry for
breaking it. Also, really update the signs when we jail someone who is
offline via a new event.

src/main/java/com/graywolf336/jail/interfaces/ICell.java

@@ -1,6 +1,8 @@
 package com.graywolf336.jail.interfaces;
 
+import java.util.HashMap;
 import java.util.HashSet;
+import java.util.List;
 
 import org.bukkit.Location;
 import org.bukkit.block.Chest;
@@ -9,74 +11,90 @@ import com.graywolf336.jail.beans.Prisoner;
 import com.graywolf336.jail.beans.SimpleLocation;
 
 public interface ICell {
+    /** Gets the id of the cell in the database, <strong>internal usage only</strong> */
+    public int getDatabaseID();
+
     /** Gets the name of the cell. */
     public String getName();
-    
+
     /** Sets the prisoner in this cell. */
     public void setPrisoner(Prisoner prisoner);
-    
+
     /** Gets the prisoner being held in this cell. */
     public Prisoner getPrisoner();
-    
+
     /** Nullifies the prisoner data. */
     public void removePrisoner();
-    
+
     /** Returns true if there is currently a prisoner in this cell. */
     public boolean hasPrisoner();
-    
+
     /** Adds all the given signs to the cell. */
     public void addAllSigns(HashSet<SimpleLocation> signs);
-    
+
     /** Adds a sign to the cell. */
     public void addSign(SimpleLocation sign);
-    
+
     /** Returns all the signs for this cell. */
     public HashSet<SimpleLocation> getSigns();
-    
+
     /** Checks if there are any signs for this cell. */
     public boolean hasSigns();
-    
+
     /** Returns the entire list of signs in a string. */
     public String getSignString();
-    
+
+    /** Gets a list of all the signs which are invalid (not signs anymore). */
+    public List<String> getInvalidSigns();
+
+    /** Removes all the signs which are no longer sign blocks. */
+    public List<String> cleanSigns();
+
+    /**
+     * Updates all the signs this cell has.
+     *
+     * @return collection of changes. The <strong>"removed"</strong> entry has all the signs which were removed. The <strong>"updated"</strong> entry has all the signs which got updated.
+     */
+    public HashMap<String, List<String>> updateSigns();
+
     /** Sets the location of where the prisoner will be teleported at when jailed here. */
     public void setTeleport(SimpleLocation location);
-    
+
     /** Gets the teleport location where the prisoner will be teleported at when jailed here. */
     public Location getTeleport();
-    
+
     /** Sets the location of the chest. */
     public void setChestLocation(SimpleLocation simpleLocation);
-    
+
     /**
      * Gets the location of the chest, returns null if no chest is stored at this cell.
-     * 
+     *
      * @return The location of the chest, null if none.
      */
     public Location getChestLocation();
-    
+
     /**
      * Gets the chest for this cell, returns null if there is no chest or the location we have is not a chest.
-     * 
+     *
      * @return The chest and its state.
      */
     public Chest getChest();
-    
+
     /**
      * Checks if the chest location doesn't equal null and if it is a double chest.
-     * 
+     *
      * @return true if there is a chest, false if there isn't.
      */
     public boolean hasChest();
-    
+
     /**
      * Sets whether this cell has been changed or not.
-     * 
+     *
      * @param changed true if we've changed it, mostly use if you want to force an update
      * @return the resulting change, whether it is changed or not
      */
     public boolean setChanged(boolean changed);
-    
+
     /** Gets whether the Cell has changed from the last save or not. */
     public boolean hasChanged();
 }