EmptyMapStorage.java
/*
* Copyright 2021 Red Hat, Inc. and/or its affiliates
* and other contributors as indicated by the @author tags.
*
* 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 org.keycloak.models.map.storage.tree;
import org.keycloak.models.map.common.AbstractEntity;
import org.keycloak.models.map.storage.MapStorage;
import org.keycloak.models.map.storage.QueryParameters;
import java.util.stream.Stream;
/**
*
* @author hmlnarik
*/
public class EmptyMapStorage {
public static <V extends AbstractEntity, M> MapStorage<V, M> getInstance() {
return new MapStorage<>() {
@Override
public V create(V value) {
return null;
}
@Override
public V read(String key) {
return null;
}
@Override
public Stream<V> read(QueryParameters<M> queryParameters) {
return Stream.empty();
}
@Override
public long getCount(QueryParameters<M> queryParameters) {
return 0;
}
@Override
public boolean delete(String key) {
return false;
}
@Override
public long delete(QueryParameters<M> queryParameters) {
return 0;
}
};
}
}