Fixed errors on empty targets in some effects;

Added export code example for mtgjson4 project;

Mage.Tests/src/test/java/org/mage/test/utils/ExportJsonGameplayDataTest.java

@@ -0,0 +1,128 @@
+package org.mage.test.utils;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.google.gson.JsonArray;
+import com.google.gson.JsonObject;
+import mage.abilities.Ability;
+import mage.abilities.Mode;
+import mage.abilities.effects.Effect;
+import mage.cards.*;
+import mage.target.Target;
+import org.apache.log4j.Logger;
+import org.junit.Ignore;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+/**
+ * @author JayDi85
+ */
+public class ExportJsonGameplayDataTest {
+
+    private static final Logger logger = Logger.getLogger(ExportJsonGameplayDataTest.class);
+
+    @Test
+    @Ignore
+    /**
+     * It's export code example for https://github.com/mtgjson/mtgjson4
+     */
+    public void exportTest() {
+        List<Card> cards = new ArrayList<>();
+        Collection<ExpansionSet> sets = Sets.getInstance().values();
+        for (ExpansionSet set : sets) {
+            if (!set.getCode().equals("GRN")) {
+                //continue;
+            }
+
+            for (ExpansionSet.SetCardInfo setInfo : set.getSetCardInfo()) {
+                if (cards.size() >= 10) {
+                    //break;
+                }
+                cards.add(CardImpl.createCard(setInfo.getCardClass(), new CardSetInfo(setInfo.getName(), set.getCode(),
+                        setInfo.getCardNumber(), setInfo.getRarity(), setInfo.getGraphicInfo())));
+            }
+        }
+
+        JsonObject res = new JsonObject();
+
+        for (Card card : cards) {
+            try {
+                JsonObject resCard = new JsonObject();
+                res.add(card.getName(), resCard);
+
+                JsonArray resAbilities = new JsonArray();
+                resCard.add("abilities", resAbilities);
+                for (Ability ability : card.getAbilities()) {
+                    JsonObject resAbility = new JsonObject();
+                    resAbilities.add(resAbility);
+
+                    // basic
+                    resAbility.addProperty("cost", ability.getManaCosts().getText());
+                    resAbility.addProperty("name", ability.toString());
+                    resAbility.addProperty("class", ability.getClass().getSimpleName());
+                    //resAbility.addProperty("rule", ability.getRule());
+
+                    // modes
+                    JsonArray resModes = new JsonArray();
+                    resAbility.add("modes", resModes);
+                    for (Mode mode : ability.getModes().values()) {
+                        JsonObject resMode = new JsonObject();
+                        resModes.add(resMode);
+
+                        // basic
+                        //resMode.addProperty("name", mode.toString());
+
+                        // effects
+                        JsonArray resEffects = new JsonArray();
+                        resMode.add("effects", resEffects);
+                        for (Effect effect : mode.getEffects()) {
+                            JsonObject resEffect = new JsonObject();
+                            resEffects.add(resEffect);
+
+                            resEffect.addProperty("class", effect.getClass().getSimpleName());
+                            resEffect.addProperty("outcome", effect.getOutcome().toString());
+                            resEffect.addProperty("text", effect.getText(mode));
+                        }
+                        if (resEffects.size() == 0) {
+                            resMode.remove("effects");
+                        }
+
+                        // targets
+                        JsonArray resTargets = new JsonArray();
+                        resMode.add("targets", resTargets);
+                        for (Target target : mode.getTargets()) {
+                            JsonObject resTarget = new JsonObject();
+                            resTargets.add(resTarget);
+
+                            resTarget.addProperty("name", target.getTargetName());
+                            resTarget.addProperty("class", target.getClass().getSimpleName());
+                            resTarget.addProperty("min", target.getMinNumberOfTargets());
+                            resTarget.addProperty("max", target.getMaxNumberOfTargets());
+                        }
+                        if (resTargets.size() == 0) {
+                            resMode.remove("targets");
+                        }
+
+                        if (resMode.get("effects") == null && resMode.get("targets") == null) {
+                            resModes.remove(resMode);
+                        }
+                    }
+                    if (resModes.size() == 0) {
+                        resAbility.remove("modes");
+                    }
+                }
+            } catch (Throwable e) {
+                logger.error("Inner error for " + card.getName() + ": " + e.getMessage(), e);
+                break;
+            }
+        }
+
+        Gson gson = new GsonBuilder()
+                .setPrettyPrinting()
+                .create();
+        System.out.println(gson.toJson(res));
+    }
+}