Added new SpellCostReductionSourceEffect to implement conditional source spell cost reductions.

Mage/src/mage/abilities/effects/CostModificationEffectImpl.java

@@ -40,10 +40,11 @@ import mage.game.Game;
  * construction to setup the object for use by the mage framework.
 
  * @author maurer.it_at_gmail.com
+ * @param <T>
  */
 public abstract class CostModificationEffectImpl<T extends CostModificationEffectImpl<T>> extends ContinuousEffectImpl<T> implements CostModificationEffect<T> {
 
-    private CostModificationType modificationType;
+    private final CostModificationType modificationType;
     
     public CostModificationEffectImpl ( Duration duration, Outcome outcome, CostModificationType type) {
         super(duration, outcome);

Mage/src/mage/abilities/effects/common/cost/SpellCostReductionSourceEffect.java

@@ -0,0 +1,109 @@
+/*
+ *  Copyright 2010 BetaSteward_at_googlemail.com. All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without modification, are
+ *  permitted provided that the following conditions are met:
+ *
+ *     1. Redistributions of source code must retain the above copyright notice, this list of
+ *        conditions and the following disclaimer.
+ *
+ *     2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *        of conditions and the following disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY BetaSteward_at_googlemail.com ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ *  FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BetaSteward_at_googlemail.com OR
+ *  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ *  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ *  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ *  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *  The views and conclusions contained in the software and documentation are those of the
+ *  authors and should not be interpreted as representing official policies, either expressed
+ *  or implied, of BetaSteward_at_googlemail.com.
+ */
+
+package mage.abilities.effects.common.cost;
+
+import mage.abilities.Ability;
+import mage.abilities.SpellAbility;
+import mage.abilities.condition.Condition;
+import mage.abilities.costs.mana.ManaCost;
+import mage.abilities.costs.mana.ManaCosts;
+import mage.abilities.effects.CostModificationEffectImpl;
+import mage.constants.CostModificationType;
+import mage.constants.Duration;
+import mage.constants.Outcome;
+import mage.game.Game;
+import mage.util.CardUtil;
+
+
+/**
+ *
+ * @author LevelX2
+ */
+
+public class SpellCostReductionSourceEffect extends CostModificationEffectImpl<SpellCostReductionSourceEffect> {
+
+    private final int amount;
+    private ManaCosts<ManaCost> manaCostsToReduce = null;
+    private final Condition condition;
+
+    public SpellCostReductionSourceEffect(ManaCosts<ManaCost> manaCostsToReduce,  Condition condition) {
+        super(Duration.WhileOnBattlefield, Outcome.Benefit, CostModificationType.REDUCE_COST);
+        this.amount = 0;
+        this.manaCostsToReduce = manaCostsToReduce;
+        this.condition = condition;
+
+        StringBuilder sb = new StringBuilder();
+        sb.append("{this} costs ");
+        for (String manaSymbol :manaCostsToReduce.getSymbols()) {
+            sb.append(manaSymbol);
+        }
+        sb.append(" less to if ").append(this.condition.toString());
+        this.staticText = sb.toString();
+    }
+
+
+    public SpellCostReductionSourceEffect(int amount, Condition condition) {
+        super(Duration.WhileOnBattlefield, Outcome.Benefit, CostModificationType.REDUCE_COST);
+        this.amount = amount;
+        this.condition = condition;
+        StringBuilder sb = new StringBuilder();
+        sb.append("{this} costs {").append(amount).append("} less to cast if ").append(this.condition.toString());
+        this.staticText = sb.toString();
+    }
+
+    protected SpellCostReductionSourceEffect(SpellCostReductionSourceEffect effect) {
+        super(effect);
+        this.amount = effect.amount;
+        this.manaCostsToReduce = effect.manaCostsToReduce;
+        this.condition = effect.condition;
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source, Ability abilityToModify) {
+        if (manaCostsToReduce != null){
+            CardUtil.adjustCost((SpellAbility) abilityToModify, manaCostsToReduce, false);
+        } else {
+            CardUtil.reduceCost(abilityToModify, this.amount);
+        }
+        return true;
+    }
+
+    @Override
+    public boolean applies(Ability abilityToModify, Ability source, Game game) {
+        if (abilityToModify.getSourceId().equals(source.getSourceId()) && (abilityToModify instanceof SpellAbility)) {            
+            return condition.apply(game, source);
+        }
+        return false;
+    }
+
+    @Override
+    public SpellCostReductionSourceEffect copy() {
+        return new SpellCostReductionSourceEffect(this);
+    }
+}

Mage/src/mage/abilities/effects/common/cost/SpellsCostReductionEffect.java

@@ -46,8 +46,8 @@ import mage.util.CardUtil;
  */
 public class SpellsCostReductionEffect extends CostModificationEffectImpl<SpellsCostReductionEffect> {
 
-    private FilterSpell filter;
+    private final FilterSpell filter;
-    private int amount;
+    private final int amount;
     private ManaCosts<ManaCost> manaCostsToReduce = null;