Add MapFlag (#375)

* Add MapFlag

Signed-off-by: Mark <33119mark@gmail.com>

* Remove apache import

Signed-off-by: Mark <33119mark@gmail.com>

* Add copyright

Signed-off-by: Mark <33119mark@gmail.com>

worldguard-legacy/src/main/java/com/sk89q/worldguard/protection/flags/MapFlag.java

@@ -0,0 +1,123 @@
+/*
+ * WorldGuard, a suite of tools for Minecraft
+ * Copyright (C) sk89q <http://www.sk89q.com>
+ * Copyright (C) WorldGuard team and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.sk89q.worldguard.protection.flags;
+
+import com.google.common.collect.Maps;
+
+import javax.annotation.Nullable;
+import java.util.Map;
+import java.util.Map.Entry;
+
+/**
+ * Stores a key value map of typed {@link Flag}s.
+ */
+public class MapFlag<K, V> extends Flag<Map<K, V>> {
+
+    private final Flag<K> keyFlag;
+    private final Flag<V> valueFlag;
+
+    public MapFlag(final String name, final Flag<K> keyFlag, final Flag<V> valueFlag) {
+        super(name);
+        this.keyFlag = keyFlag;
+        this.valueFlag = valueFlag;
+    }
+
+    public MapFlag(final String name, @Nullable final RegionGroup defaultGroup, final Flag<K> keyFlag, final Flag<V> valueFlag) {
+        super(name, defaultGroup);
+        this.keyFlag = keyFlag;
+        this.valueFlag = valueFlag;
+    }
+
+    /**
+     * Get the flag that is stored as the key flag type.
+     *
+     * @return The key flag type.
+     */
+    public Flag<K> getKeyFlag() {
+        return this.keyFlag;
+    }
+
+    /**
+     * Get the flag type that is stored as values.
+     *
+     * @return The value flag type.
+     */
+    public Flag<V> getValueFlag() {
+        return this.valueFlag;
+    }
+
+    @Override
+    public Map<K, V> parseInput(final FlagContext context) throws InvalidFlagFormat {
+
+        final String input = context.getUserInput();
+        if (input.isEmpty()) {
+            return Maps.newHashMap();
+        }
+
+        final Map<K, V> items = Maps.newHashMap();
+        for (final String str : input.split(",")) {
+
+            final char split = str.indexOf('=') == -1 ? ':' : '=';
+            final String[] keyVal = str.split(String.valueOf(split));
+            if (keyVal.length != 2) {
+                throw new InvalidFlagFormat("Input must be in a 'key:value,key1=value1' format. Either ':' or '=' can be used.");
+            }
+
+            final FlagContext key = context.copyWith(null, keyVal[0], null);
+            final FlagContext value = context.copyWith(null, keyVal[1], null);
+            items.put(this.keyFlag.parseInput(key), this.valueFlag.parseInput(value));
+        }
+
+        return items;
+    }
+
+    @Override
+    public Map<K, V> unmarshal(@Nullable final Object o) {
+
+        if (o instanceof Map<?, ?>) {
+
+            final Map<?, ?> map = (Map<?, ?>) o;
+            final Map<K, V> items = Maps.newHashMap();
+            for (final Entry<?, ?> entry : map.entrySet()) {
+
+                final K keyItem = this.keyFlag.unmarshal(entry.getKey());
+                final V valueItem = this.valueFlag.unmarshal(entry.getValue());
+                if (keyItem != null && valueItem != null) {
+                    items.put(keyItem, valueItem);
+                }
+            }
+
+            return items;
+        }
+
+        return null;
+    }
+
+    @Override
+    public Object marshal(final Map<K, V> o) {
+
+        final Map<Object, Object> map = Maps.newHashMap();
+        for (final Entry<K, V> entry : o.entrySet()) {
+            map.put(this.keyFlag.marshal(entry.getKey()), this.valueFlag.marshal(entry.getValue()));
+        }
+
+        return map;
+    }
+}