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diff --git a/app/src/main/kotlin/com/pitchedapps/frost/utils/iab/Inventory.java b/app/src/main/kotlin/com/pitchedapps/frost/utils/iab/Inventory.java
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+/* Copyright (c) 2012 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.pitchedapps.frost.utils.iab;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Represents a block of information about in-app items.
+ * An Inventory is returned by such methods as {@link IabHelper#queryInventory}.
+ */
+public class Inventory {
+    Map<String,SkuDetails> mSkuMap = new HashMap<String,SkuDetails>();
+    Map<String,Purchase> mPurchaseMap = new HashMap<String,Purchase>();
+
+    Inventory() { }
+
+    /** Returns the listing details for an in-app product. */
+    public SkuDetails getSkuDetails(String sku) {
+        return mSkuMap.get(sku);
+    }
+
+    /** Returns purchase information for a given product, or null if there is no purchase. */
+    public Purchase getPurchase(String sku) {
+        return mPurchaseMap.get(sku);
+    }
+
+    /** Returns whether or not there exists a purchase of the given product. */
+    public boolean hasPurchase(String sku) {
+        return mPurchaseMap.containsKey(sku);
+    }
+
+    /** Return whether or not details about the given product are available. */
+    public boolean hasDetails(String sku) {
+        return mSkuMap.containsKey(sku);
+    }
+
+    /**
+     * Erase a purchase (locally) from the inventory, given its product ID. This just
+     * modifies the Inventory object locally and has no effect on the server! This is
+     * useful when you have an existing Inventory object which you know to be up to date,
+     * and you have just consumed an item successfully, which means that erasing its
+     * purchase data from the Inventory you already have is quicker than querying for
+     * a new Inventory.
+     */
+    public void erasePurchase(String sku) {
+        if (mPurchaseMap.containsKey(sku)) mPurchaseMap.remove(sku);
+    }
+
+    /** Returns a list of all owned product IDs. */
+    List<String> getAllOwnedSkus() {
+        return new ArrayList<String>(mPurchaseMap.keySet());
+    }
+
+    /** Returns a list of all owned product IDs of a given type */
+    List<String> getAllOwnedSkus(String itemType) {
+        List<String> result = new ArrayList<String>();
+        for (Purchase p : mPurchaseMap.values()) {
+            if (p.getItemType().equals(itemType)) result.add(p.getSku());
+        }
+        return result;
+    }
+
+    /** Returns a list of all purchases. */
+    List<Purchase> getAllPurchases() {
+        return new ArrayList<Purchase>(mPurchaseMap.values());
+    }
+
+    void addSkuDetails(SkuDetails d) {
+        mSkuMap.put(d.getSku(), d);
+    }
+
+    void addPurchase(Purchase p) {
+        mPurchaseMap.put(p.getSku(), p);
+    }
+}