1 files changed, 66 insertions, 0 deletions
diff --git a/packages/StatementService/src/com/android/statementservice/retriever/AssetFactory.java b/packages/StatementService/src/com/android/statementservice/retriever/AssetFactory.java
new file mode 100644
index 0000000..762365e
--- /dev/null
+++ b/packages/StatementService/src/com/android/statementservice/retriever/AssetFactory.java
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * 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.android.statementservice.retriever;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+/**
+ * Factory to create asset from JSON string.
+ */
+/* package private */ final class AssetFactory {
+
+    private static final String FIELD_NOT_STRING_FORMAT_STRING = "Expected %s to be string.";
+
+    private AssetFactory() {}
+
+    /**
+     * Creates a new Asset object from its JSON string representation.
+     *
+     * @throws AssociationServiceException if the assetJson is not well formatted.
+     */
+    public static AbstractAsset create(String assetJson) throws AssociationServiceException {
+        try {
+            return create(new JSONObject(assetJson));
+        } catch (JSONException e) {
+            throw new AssociationServiceException(
+                    "Input is not a well formatted asset descriptor.");
+        }
+    }
+
+    /**
+     * Checks that the input is a valid asset with purposes.
+     *
+     * @throws AssociationServiceException if the asset is not well formatted.
+     */
+    private static AbstractAsset create(JSONObject asset)
+            throws AssociationServiceException {
+        String namespace = asset.optString(Utils.NAMESPACE_FIELD, null);
+        if (namespace == null) {
+            throw new AssociationServiceException(String.format(
+                    FIELD_NOT_STRING_FORMAT_STRING, Utils.NAMESPACE_FIELD));
+        }
+
+        if (namespace.equals(Utils.NAMESPACE_WEB)) {
+            return WebAsset.create(asset);
+        } else if (namespace.equals(Utils.NAMESPACE_ANDROID_APP)) {
+            return AndroidAppAsset.create(asset);
+        } else {
+            throw new AssociationServiceException("Namespace " + namespace + " is not supported.");
+        }
+    }
+}