org.jclouds.atmos.functions.ParseUserMetadataFromHeaders.java Source code

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Here is the source code for org.jclouds.atmos.functions.ParseUserMetadataFromHeaders.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.jclouds.atmos.functions;

import static com.google.common.base.Preconditions.checkNotNull;

import java.util.Map;
import java.util.Set;

import javax.inject.Singleton;

import org.jclouds.atmos.domain.UserMetadata;
import org.jclouds.atmos.reference.AtmosHeaders;
import org.jclouds.http.HttpResponse;

import com.google.common.base.Function;
import com.google.common.base.Predicates;
import com.google.common.base.Splitter;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Maps;
import com.google.common.collect.ImmutableMap.Builder;

/**
 * @author Adrian Cole
 */
@Singleton
public class ParseUserMetadataFromHeaders implements Function<HttpResponse, UserMetadata> {
    private static final Set<String> SYS_KEYS = ImmutableSet.of("atime", "ctime", "gid", "itime", "mtime", "nlink",
            "policyname", "size", "uid", "content-md5", "objectid", "objname", "type");

    public UserMetadata apply(HttpResponse from) {
        checkNotNull(from, "http response");

        Map<String, String> meta = Maps.filterKeys(
                getMetaMap(checkNotNull(from.getFirstHeaderOrNull(AtmosHeaders.META), AtmosHeaders.META)),
                Predicates.not(Predicates.in(SYS_KEYS)));

        Map<String, String> listableMeta = (from.getFirstHeaderOrNull(AtmosHeaders.LISTABLE_META) != null)
                ? getMetaMap(from.getFirstHeaderOrNull(AtmosHeaders.LISTABLE_META))
                : ImmutableMap.<String, String>of();

        Iterable<String> tags = (from.getFirstHeaderOrNull(AtmosHeaders.TAGS) != null)
                ? Splitter.on(", ").split(from.getFirstHeaderOrNull(AtmosHeaders.TAGS))
                : ImmutableSet.<String>of();

        Iterable<String> listableTags = (from.getFirstHeaderOrNull(AtmosHeaders.LISTABLE_TAGS) != null)
                ? Splitter.on(", ").split(from.getFirstHeaderOrNull(AtmosHeaders.LISTABLE_TAGS))
                : ImmutableSet.<String>of();

        return new UserMetadata(meta, listableMeta, tags, listableTags);
    }

    // TODO: change to guava
    private Map<String, String> getMetaMap(String meta) {
        Builder<String, String> metaMap = ImmutableMap.builder();
        for (String entry : Splitter.on(", ").split(meta)) {
            String[] entrySplit = entry.split("=");
            metaMap.put(entrySplit[0], entrySplit[1]);
        }
        return metaMap.build();
    }
}