com.huawei.openstack4j.model.map.reduce.options.BaseListOptions Maven / Gradle / Ivy
/*******************************************************************************
* Copyright 2018 Huawei Technologies Co., Ltd.
*
* 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.huawei.openstack4j.model.map.reduce.options;
import java.util.Map;
import com.google.common.base.Strings;
import com.google.common.collect.Maps;
/**
* filter options for list MapReduce resources
*
* @author QianBiao.NG
* @date 2017-06-30 10:30:53
*/
public abstract class BaseListOptions {
private Map queryParams = Maps.newHashMap();
protected BaseListOptions() {
}
/**
* add sort by attribute DESC filter condition
*
* @param attribute
* @return
*/
public T desc(String attribute) {
return add("sort_by", Strings.isNullOrEmpty(attribute) ? null : "-" + attribute);
}
/**
* add sort by attribute ASC filter condition
* @param attribute
* @return
*/
public T asc(String attribute) {
return add("sort_by", attribute);
}
public T marker(String marker) {
return add("marker", marker);
}
public T limit(Integer limit) {
return add("limit", limit);
}
@SuppressWarnings("unchecked")
private T add(String param, Object value) {
if (value != null)
this.queryParams.put(param, value);
return (T) this;
}
public Map getOptions() {
return queryParams;
}
}