Add an interface for the Jail Pay Manager.

Further API work.

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

@@ -0,0 +1,64 @@
+package com.graywolf336.jail.interfaces;
+
+import net.milkbowl.vault.economy.Economy;
+
+import org.bukkit.Material;
+import org.bukkit.entity.Player;
+
+import com.graywolf336.jail.beans.Prisoner;
+
+public interface IJailPayManager {
+	
+	/** Checks if paying for infinite is enabled. */
+    public boolean isInfiniteEnabled();
+    
+    /** Checks if paying for timed is enabled. */
+    public boolean isTimedEnabled();
+    
+    /** Gets how much it cost per minute in string format. */
+    public String getCostPerMinute();
+    
+    /**
+     * Calculates how much players have to pay to get completely free.
+     * 
+     * @param prisoner data of who we're calculating
+     * @return The economy cost the prisoner will need to pay to get completely free.
+     */
+    public double calculateBill(Prisoner prisoner);
+    
+    /** Gets how many minutes someone is paying for (rounds to the lowest number). */
+    public long getMinutesPayingFor(double amount);
+    
+    /** Returns if we are using items for payment instead of economy. */
+    public boolean usingItemsForPayment();
+    
+    /**
+     * Gets the {@link Material} it costs for jail pay, will be air if using economy.
+     * 
+     * @return The item type it costs, air if using virtual economy.
+     */
+    public Material getItemItCost();
+    
+    /**
+     * Checks if the player has enough money/items to pay what they have said they want to.
+     * 
+     * @param player The player who is doing the paying.
+     * @param amount The amount to check they if they have.
+     * @return true if they have enough, false if not.
+     */
+    public boolean hasEnoughToPay(Player player, double amount);
+    
+    /**
+     * Pays the required fees from the given player, removing items or money from economy.
+     * 
+     * @param player The player who is paying.
+     * @param amount The amount of items or money to withdraw from the player.
+     */
+    public void pay(Player player, double amount);
+    
+    /** Gets the name of the item in nice capitals. */
+    public String getCurrencyName();
+    
+    /** Returns the economy provider to do transaction with. */
+    public Economy getEconomy();
+}