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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
* under the License.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* .
*
*/
package org.apache.hc.client5.http.impl;
import java.util.concurrent.atomic.AtomicLong;
import org.apache.hc.core5.annotation.Internal;
import org.apache.hc.core5.util.Args;
/**
* A thread safe incrementing identifier.
*
* @since 5.1.4
*/
@Internal
public final class PrefixedIncrementingId {
private final AtomicLong count = new AtomicLong(0);
private final String prefix0;
private final String prefix1;
private final String prefix2;
private final String prefix3;
private final String prefix4;
private final String prefix5;
private final String prefix6;
private final String prefix7;
private final String prefix8;
private final String prefix9;
/**
* Creates an incrementing identifier.
* @param prefix string prefix for generated IDs
*/
public PrefixedIncrementingId(final String prefix) {
this.prefix0 = Args.notNull(prefix, "prefix");
this.prefix1 = prefix0 + '0';
this.prefix2 = prefix1 + '0';
this.prefix3 = prefix2 + '0';
this.prefix4 = prefix3 + '0';
this.prefix5 = prefix4 + '0';
this.prefix6 = prefix5 + '0';
this.prefix7 = prefix6 + '0';
this.prefix8 = prefix7 + '0';
this.prefix9 = prefix8 + '0';
}
public long getNextNumber() {
return count.incrementAndGet();
}
public String getNextId() {
return createId(count.incrementAndGet());
}
/**
* Create an ID from this instance's prefix and zero padded specified value.
*
* Hand rolled equivalent to `String.format("ex-%010d", value)` optimized to reduce
* allocation and CPU overhead.
*/
String createId(final long value) {
final String longString = Long.toString(value);
switch (longString.length()) {
case 1:
return prefix9 + longString;
case 2:
return prefix8 + longString;
case 3:
return prefix7 + longString;
case 4:
return prefix6 + longString;
case 5:
return prefix5 + longString;
case 6:
return prefix4 + longString;
case 7:
return prefix3 + longString;
case 8:
return prefix2 + longString;
case 9:
return prefix1 + longString;
default:
return prefix0 + longString;
}
}
}
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