StringUtils.java

package org.apache.bookkeeper.util;

/**
 * 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.
 */

import java.io.IOException;
import java.net.InetSocketAddress;

/**
 * Provided utilites for parsing network addresses, ledger-id from node paths
 * etc.
 * 
 */
public class StringUtils {

    /*
     * Path to ledger metadata. ZooKeeper appends a sequence number to L.
     */
    static public final String prefix = "/ledgers/L";

    /**
     * Parses address into IP and port.
     * 
     * @param addr
     *            String
     */

    public static InetSocketAddress parseAddr(String s) throws IOException {

        String parts[] = s.split(":");
        if (parts.length != 2) {
            throw new IOException(s + " does not have the form host:port");
        }
        int port;
        try {
            port = Integer.parseInt(parts[1]);
        } catch (NumberFormatException e) {
            throw new IOException(s + " does not have the form host:port");
        }

        InetSocketAddress addr = new InetSocketAddress(parts[0], port);
        return addr;
    }

    public static StringBuilder addrToString(StringBuilder sb, InetSocketAddress addr) {
        return sb.append(addr.getAddress().getHostAddress()).append(":").append(addr.getPort());
    }

    /**
     * Formats ledger ID according to ZooKeeper rules
     * 
     * @param id
     *            znode id
     */
    public static String getZKStringId(long id) {
        return String.format("%010d", id);
    }

    /**
     * Get the path for the ledger metadata node
     * 
     * @return
     */
    public static String getLedgerNodePath(long ledgerId) {
        return prefix + StringUtils.getZKStringId(ledgerId);
    }

    public static long getLedgerId(String nodeName) throws IOException {
        long ledgerId;
        try {
            String parts[] = nodeName.split(prefix);
            ledgerId = Long.parseLong(parts[parts.length - 1]);
        } catch (NumberFormatException e) {
            throw new IOException(e);
        }
        return ledgerId;
    }

}