com.vmware.photon.controller.api.frontend.lib.UsageTagHelper.java Source code

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Here is the source code for com.vmware.photon.controller.api.frontend.lib.UsageTagHelper.java

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/*
 * Copyright 2015 VMware, Inc. 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.
 */

package com.vmware.photon.controller.api.frontend.lib;

import com.vmware.photon.controller.api.model.UsageTag;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.common.collect.Ordering;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

/**
 * Helper methods for UsageTag related operations.
 */
public class UsageTagHelper {

    private static final Logger logger = LoggerFactory.getLogger(UsageTagHelper.class);
    private static final ObjectMapper objectMapper = new ObjectMapper();

    public static List<UsageTag> deserialize(String concatenatedUsageTags) {
        if (StringUtils.isBlank(concatenatedUsageTags)) {
            throw new IllegalArgumentException("Blank string cannot be deserialized to list of UsageTags");
        }

        try {
            List<UsageTag> usageTags = objectMapper.readValue(concatenatedUsageTags,
                    new TypeReference<List<UsageTag>>() {
                    });
            Collections.sort(usageTags);
            return usageTags;
        } catch (IOException e) {
            logger.error(String.format("Error deserializing UsageTag %s", concatenatedUsageTags), e);
            throw new IllegalArgumentException(
                    String.format("Error deserializing UsageTag %s", concatenatedUsageTags), e);
        }
    }

    public static Set<String> deserializeToStringSet(String concatenatedUsageTags) {
        Set<String> usageTags = new HashSet<>();
        for (UsageTag usageTag : deserialize(concatenatedUsageTags)) {
            usageTags.add(usageTag.toString());
        }
        return usageTags;
    }

    public static String serialize(List<UsageTag> usageTags) {
        if (usageTags == null) {
            throw new IllegalArgumentException("Null usage tag list cannot be serialized");
        }

        try {
            return objectMapper
                    .writeValueAsString(Ordering.usingToString().natural().immutableSortedCopy(usageTags));
        } catch (JsonProcessingException e) {
            logger.error("Error serializing usageTags list", e);
            throw new IllegalArgumentException(
                    String.format("Error serializing usageTags list: %s", e.getMessage()));
        }
    }

    public static String serialize(Set<String> usageTags) {
        if (usageTags == null) {
            throw new IllegalArgumentException("Null usage tag set cannot be serialized");
        }

        try {
            return objectMapper
                    .writeValueAsString(Ordering.usingToString().natural().immutableSortedCopy(usageTags));
        } catch (JsonProcessingException e) {
            logger.error("Error serializing usageTags set", e);
            throw new IllegalArgumentException(
                    String.format("Error serializing usageTags set: %s", e.getMessage()));
        }
    }
}