co.cask.cdap.explore.jdbc.ExploreConnectionParams.java Source code

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Here is the source code for co.cask.cdap.explore.jdbc.ExploreConnectionParams.java

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/*
 * Copyright  2016 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.explore.jdbc;

import com.google.common.base.Splitter;
import com.google.common.collect.ImmutableMultimap;
import com.google.common.collect.Multimap;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.net.URI;
import java.util.Collection;

/**
 * Explore connection parameters.
 */
public class ExploreConnectionParams {
    private static final Logger LOG = LoggerFactory.getLogger(ExploreConnectionParams.class);
    static final int DEFAULT_FETCH_SIZE = 1000;

    /**
     * Extra Explore connection parameter.
     */
    public enum Info {
        EXPLORE_AUTH_TOKEN("auth.token"), NAMESPACE("namespace"), SSL_ENABLED("ssl.enabled"), VERIFY_SSL_CERT(
                "verify.ssl.cert"), FETCH_SIZE("fetch.size");

        private final String name;

        Info(String name) {
            this.name = name;
        }

        public String getName() {
            return name;
        }

        public static Info fromStr(String name) {
            for (Info info : Info.values()) {
                if (info.getName().equals(name)) {
                    return info;
                }
            }
            return null;
        }
    }

    private final String host;
    private final int port;
    private final Multimap<Info, String> extraInfos;

    ExploreConnectionParams(String host, int port, Multimap<Info, String> extraInfos) {
        this.host = host;
        this.port = port;
        this.extraInfos = extraInfos;
    }

    public Multimap<Info, String> getExtraInfos() {
        return extraInfos;
    }

    public int getPort() {
        return port;
    }

    public String getHost() {
        return host;
    }

    public int getFetchSize() {
        Collection<String> fetchSizes = extraInfos.get(Info.FETCH_SIZE);
        if (fetchSizes.isEmpty()) {
            return DEFAULT_FETCH_SIZE;
        } else {
            String fetch = fetchSizes.iterator().next();
            try {
                return Integer.parseInt(fetch);
            } catch (NumberFormatException e) {
                LOG.warn("Could not parse fetch size '{}'. Using default of {}.", fetch, DEFAULT_FETCH_SIZE);
                return DEFAULT_FETCH_SIZE;
            }
        }
    }

    /**
     * Parse Explore connection url string to retrieve the necessary parameters to connect to CDAP.
     */
    public static ExploreConnectionParams parseConnectionUrl(String url) {
        // URI does not accept two semicolons in a URL string, hence the substring
        URI jdbcURI = URI.create(url.substring(ExploreJDBCUtils.URI_JDBC_PREFIX.length()));
        String host = jdbcURI.getHost();
        int port = jdbcURI.getPort();
        ImmutableMultimap.Builder<ExploreConnectionParams.Info, String> builder = ImmutableMultimap.builder();

        // get the query params - javadoc for getQuery says that it decodes the query URL with UTF-8 charset.
        String query = jdbcURI.getQuery();
        if (query != null) {
            for (String entry : Splitter.on("&").split(query)) {
                // Need to do it twice because of error in guava libs Issue: 1577
                int idx = entry.indexOf('=');
                if (idx <= 0) {
                    continue;
                }

                ExploreConnectionParams.Info info = ExploreConnectionParams.Info.fromStr(entry.substring(0, idx));
                if (info != null) {
                    builder.putAll(info, Splitter.on(',').omitEmptyStrings().split(entry.substring(idx + 1)));
                }
            }
        }
        return new ExploreConnectionParams(host, port, builder.build());
    }
}