co.cask.cdap.data2.datafabric.dataset.service.ConversionHelpers.java Source code

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Here is the source code for co.cask.cdap.data2.datafabric.dataset.service.ConversionHelpers.java

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/*
 * Copyright  2015 Cask Data, Inc.
 *
 * 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 co.cask.cdap.data2.datafabric.dataset.service;

import co.cask.cdap.api.dataset.DatasetSpecification;
import co.cask.cdap.common.BadRequestException;
import co.cask.cdap.data2.datafabric.dataset.DatasetsUtil;
import co.cask.cdap.data2.transaction.queue.QueueConstants;
import co.cask.cdap.proto.DatasetInstanceConfiguration;
import co.cask.cdap.proto.DatasetSpecificationSummary;
import co.cask.cdap.proto.Id;
import com.google.common.base.Charsets;
import com.google.common.base.Function;
import com.google.common.base.Preconditions;
import com.google.common.collect.Lists;
import com.google.common.reflect.TypeToken;
import com.google.gson.Gson;
import com.google.gson.JsonSyntaxException;
import org.jboss.netty.buffer.ChannelBufferInputStream;
import org.jboss.netty.handler.codec.http.HttpRequest;

import java.io.InputStreamReader;
import java.io.Reader;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import javax.annotation.Nullable;

class ConversionHelpers {

    private static final Gson GSON = new Gson();

    static Id.Namespace toNamespaceId(String namespace) throws BadRequestException {
        try {
            return Id.Namespace.from(namespace);
        } catch (IllegalArgumentException | NullPointerException e) {
            throw new BadRequestException(e.getMessage());
        }
    }

    static Id.DatasetInstance toDatasetInstanceId(String namespace, String name) throws BadRequestException {
        try {
            return Id.DatasetInstance.from(namespace, name);
        } catch (IllegalArgumentException | NullPointerException e) {
            throw new BadRequestException(e.getMessage());
        }
    }

    static Id.DatasetType toDatasetTypeId(String namespace, String typeName) throws BadRequestException {
        try {
            return Id.DatasetType.from(namespace, typeName);
        } catch (IllegalArgumentException | NullPointerException e) {
            throw new BadRequestException(e.getMessage());
        }
    }

    static Id.DatasetType toDatasetTypeId(Id.Namespace namespace, String typeName) throws BadRequestException {
        try {
            return Id.DatasetType.from(namespace, typeName);
        } catch (IllegalArgumentException | NullPointerException e) {
            throw new BadRequestException(e.getMessage());
        }
    }

    static List<? extends Id> strings2ProgramIds(List<String> strings) throws BadRequestException {
        try {
            return Lists.transform(strings, new Function<String, Id>() {
                @Nullable
                @Override
                public Id apply(@Nullable String input) {
                    if (input == null || input.isEmpty()) {
                        return null;
                    }
                    return Id.fromString(input, Id.Program.class);
                }
            });
        } catch (IllegalArgumentException | NullPointerException e) {
            throw new BadRequestException(e.getMessage());
        }
    }

    static Collection<DatasetSpecificationSummary> spec2Summary(Collection<DatasetSpecification> specs) {
        List<DatasetSpecificationSummary> datasetSummaries = Lists.newArrayList();
        for (DatasetSpecification spec : specs) {
            // TODO: (CDAP-3097) handle system datasets specially within a namespace instead of filtering them out
            // by the handler. This filter is only in the list endpoint because the other endpoints are used by
            // HBaseQueueAdmin through DatasetFramework.
            if (QueueConstants.STATE_STORE_NAME.equals(spec.getName())) {
                continue;
            }
            spec = DatasetsUtil.fixOriginalProperties(spec);
            datasetSummaries.add(new DatasetSpecificationSummary(spec.getName(), spec.getType(),
                    spec.getDescription(), spec.getOriginalProperties()));
        }
        return datasetSummaries;
    }

    static DatasetInstanceConfiguration getInstanceConfiguration(HttpRequest request) throws BadRequestException {
        Reader reader = new InputStreamReader(new ChannelBufferInputStream(request.getContent()), Charsets.UTF_8);
        try {
            DatasetInstanceConfiguration config = GSON.fromJson(reader, DatasetInstanceConfiguration.class);
            Preconditions.checkNotNull(config.getTypeName(), "The typeName must be specified.");
            return config;
        } catch (JsonSyntaxException | NullPointerException e) {
            throw new BadRequestException(e.getMessage());
        }
    }

    static Map<String, String> getProperties(HttpRequest request) throws BadRequestException {
        Reader reader = new InputStreamReader(new ChannelBufferInputStream(request.getContent()), Charsets.UTF_8);
        try {
            return GSON.fromJson(reader, new TypeToken<Map<String, String>>() {
            }.getType());
        } catch (JsonSyntaxException e) {
            throw new BadRequestException(e.getMessage());
        }
    }

    static String toJson(Map<String, String> properties) {
        return GSON.toJson(properties);
    }
}