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/*
* 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.");
}
}
}
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