com.huawei.openstack4j.openstack.storage.object.functions.MapWithoutMetaPrefixFunction Maven / Gradle / Ivy
/*******************************************************************************
* Copyright 2016 ContainX and OpenStack4j
*
* 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.openstack.storage.object.functions;
import java.util.Map;
import com.google.common.base.Function;
import com.google.common.collect.ImmutableMap;
/**
* Transforms a Swift Metadata Map into a Map without the meta prefix as key values
*
* @author Jeremy Unruh
*/
public class MapWithoutMetaPrefixFunction implements Function, Map> {
public static final MapWithoutMetaPrefixFunction INSTANCE = new MapWithoutMetaPrefixFunction();
@Override
public Map apply(Map input) {
ImmutableMap.Builder metadata = ImmutableMap.builder();
for (String key : input.keySet()) {
if (key == null) {
continue;
}
int idx = key.indexOf("-Meta-");
if (idx > -1) {
metadata.put(key.substring(idx + 6), input.get(key));
}
if (key.indexOf("X-") > -1) {
metadata.put(key, input.get(key));
}
}
return metadata.build();
}
}