diff options
Diffstat (limited to 'common/src/main/java/org/openecomp/mso/client/RestPropertiesLoader.java')
-rw-r--r-- | common/src/main/java/org/openecomp/mso/client/RestPropertiesLoader.java | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/common/src/main/java/org/openecomp/mso/client/RestPropertiesLoader.java b/common/src/main/java/org/openecomp/mso/client/RestPropertiesLoader.java new file mode 100644 index 0000000000..647acdfcf4 --- /dev/null +++ b/common/src/main/java/org/openecomp/mso/client/RestPropertiesLoader.java @@ -0,0 +1,73 @@ +/*- + * ============LICENSE_START======================================================= + * ONAP - SO + * ================================================================================ + * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved. + * ================================================================================ + * 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. + * ============LICENSE_END========================================================= + */ + +package org.openecomp.mso.client; + +import java.util.Iterator; +import java.util.ServiceLoader; + +public class RestPropertiesLoader { + + private final ServiceLoader<RestProperties> services; + private RestPropertiesLoader() { + services = ServiceLoader.load(RestProperties.class); + } + + private static class Helper { + private static final RestPropertiesLoader INSTANCE = new RestPropertiesLoader(); + } + + public static RestPropertiesLoader getInstance() { + return Helper.INSTANCE; + } + + public <T> T getNewImpl(Class<? extends RestProperties> clazz) { + return this.getImpl(clazz, true); + } + public <T> T getImpl(Class<? extends RestProperties> clazz) { + return this.getImpl(clazz, false); + } + + private <T> T getImpl(Class<? extends RestProperties> clazz, boolean forceNewInstance) { + T result = null; + Iterator<RestProperties> propertyImpls = services.iterator(); + RestProperties item; + while (propertyImpls.hasNext()) { + item = propertyImpls.next(); + if (clazz.isAssignableFrom(item.getClass())) { + try { + if (forceNewInstance) { + result = (T)item.getClass().newInstance(); + } else { + result = (T)item; + } + } catch (InstantiationException | IllegalAccessException e) { + /* all spi implementations must provide a public + * no argument constructor + */ + + } + //break; + } + } + + return result; + } +} |