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/**************************************************************
 * 
 * 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
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package com.sun.star.lib.uno.environments.remote;

import com.sun.star.uno.UnoRuntime;
import java.io.UnsupportedEncodingException;
import java.math.BigInteger;
import java.util.Arrays;

public final class ThreadId {
    public static ThreadId createFresh() {
        BigInteger c;
        synchronized (PREFIX) {
            c = count;
            count = count.add(BigInteger.ONE);
        }
        try {
            return new ThreadId((PREFIX + c).getBytes("UTF-8"));
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException("this cannot happen: " + e);
        }
    }

    public ThreadId(byte[] id) {
        this.id = id;
    }

    public boolean equals(Object obj) {
        return obj instanceof ThreadId
            && Arrays.equals(id, ((ThreadId) obj).id);
    }

    public int hashCode() {
        int h = hash;
        if (h == 0) {
            // Same algorithm as java.util.List.hashCode (also see Java 1.5
            // java.util.Arrays.hashCode(byte[])):
            h = 1;
            for (int i = 0; i < id.length; ++i) {
                h = 31 * h + id[i];
            }
            hash = h;
        }
        return h;
    }

    public String toString() {
        StringBuffer b = new StringBuffer("[ThreadId:");
        for (int i = 0; i < id.length; ++i) {
            String n = Integer.toHexString(id[i] & 0xFF);
            if (n.length() == 1) {
                b.append('0');
            }
            b.append(n);
        }
        b.append(']');
        return b.toString();
    }

    public byte[] getBytes() {
        return id;
    }

    private static final String PREFIX
    = "java:" + UnoRuntime.getUniqueKey() + ":";
    private static BigInteger count = BigInteger.ZERO;

    private byte[] id;
    private int hash = 0;
}