org.springframework.data.mongodb.config.ServerAddressPropertyEditor.java Source code

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Here is the source code for org.springframework.data.mongodb.config.ServerAddressPropertyEditor.java

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/*
 * Copyright 2011-2013 the original author or authors.
 *
 * 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 org.springframework.data.mongodb.config;

import java.beans.PropertyEditorSupport;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.HashSet;
import java.util.Set;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;

import com.mongodb.ServerAddress;

/**
 * Parse a {@link String} to a {@link ServerAddress} array. The format is host1:port1,host2:port2,host3:port3.
 * 
 * @author Mark Pollack
 * @author Oliver Gierke
 * @author Thomas Darimont
 */
public class ServerAddressPropertyEditor extends PropertyEditorSupport {

    /**
     * A port is a number without a leading 0 at the end of the address that is proceeded by just a single :.
     */
    private static final String HOST_PORT_SPLIT_PATTERN = "(?<!:):(?=[123456789]\\d*$)";
    private static final String COULD_NOT_PARSE_ADDRESS_MESSAGE = "Could not parse address {} '{}'. Check your replica set configuration!";
    private static final Logger LOG = LoggerFactory.getLogger(ServerAddressPropertyEditor.class);

    /*
     * (non-Javadoc)
     * @see java.beans.PropertyEditorSupport#setAsText(java.lang.String)
     */
    @Override
    public void setAsText(String replicaSetString) {

        if (!StringUtils.hasText(replicaSetString)) {
            setValue(null);
            return;
        }

        String[] replicaSetStringArray = StringUtils.commaDelimitedListToStringArray(replicaSetString);
        Set<ServerAddress> serverAddresses = new HashSet<ServerAddress>(replicaSetStringArray.length);

        for (String element : replicaSetStringArray) {

            ServerAddress address = parseServerAddress(element);

            if (address != null) {
                serverAddresses.add(address);
            }
        }

        if (serverAddresses.isEmpty()) {
            throw new IllegalArgumentException(
                    "Could not resolve at least one server of the replica set configuration! Validate your config!");
        }

        setValue(serverAddresses.toArray(new ServerAddress[serverAddresses.size()]));
    }

    /**
     * Parses the given source into a {@link ServerAddress}.
     * 
     * @param source
     * @return the
     */
    private ServerAddress parseServerAddress(String source) {

        if (!StringUtils.hasText(source)) {
            LOG.warn(COULD_NOT_PARSE_ADDRESS_MESSAGE, "source", source);
            return null;
        }

        String[] hostAndPort = extractHostAddressAndPort(source.trim());

        if (hostAndPort.length > 2) {
            LOG.warn(COULD_NOT_PARSE_ADDRESS_MESSAGE, "source", source);
            return null;
        }

        try {
            InetAddress hostAddress = InetAddress.getByName(hostAndPort[0]);
            Integer port = hostAndPort.length == 1 ? null : Integer.parseInt(hostAndPort[1]);

            return port == null ? new ServerAddress(hostAddress) : new ServerAddress(hostAddress, port);
        } catch (UnknownHostException e) {
            LOG.warn(COULD_NOT_PARSE_ADDRESS_MESSAGE, "host", hostAndPort[0]);
        } catch (NumberFormatException e) {
            LOG.warn(COULD_NOT_PARSE_ADDRESS_MESSAGE, "port", hostAndPort[1]);
        }

        return null;
    }

    /**
     * Extract the host and port from the given {@link String}.
     * 
     * @param addressAndPortSource must not be {@literal null}.
     * @return
     */
    private String[] extractHostAddressAndPort(String addressAndPortSource) {

        Assert.notNull(addressAndPortSource, "Address and port source must not be null!");

        String[] hostAndPort = addressAndPortSource.split(HOST_PORT_SPLIT_PATTERN);
        String hostAddress = hostAndPort[0];

        if (isHostAddressInIPv6BracketNotation(hostAddress)) {
            hostAndPort[0] = hostAddress.substring(1, hostAddress.length() - 1);
        }

        return hostAndPort;
    }

    private boolean isHostAddressInIPv6BracketNotation(String hostAddress) {
        return hostAddress.startsWith("[") && hostAddress.endsWith("]");
    }
}