Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/**
 * 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.
 */

public class Main {
    /**
     * Expert: Integers are stored at lower precision by shifting off lower bits. The shift count is
     * stored as <code>SHIFT_START_INT+shift</code> in the first character
     */
    public static final char SHIFT_START_INT = (char) 0x60;

    public static int prefixCodedToInt(final String prefixCoded) {
        final int shift = prefixCoded.charAt(0) - SHIFT_START_INT;
        if (shift > 31 || shift < 0)
            throw new NumberFormatException(
                    "Invalid shift value in prefixCoded string (is encoded value really an INT?)");
        int sortableBits = 0;
        for (int i = 1, len = prefixCoded.length(); i < len; i++) {
            sortableBits <<= 7;
            final char ch = prefixCoded.charAt(i);
            if (ch > 0x7f) {
                throw new NumberFormatException("Invalid prefixCoded numerical value representation (char "
                        + Integer.toHexString(ch) + " at position " + i + " is invalid)");
            }
            sortableBits |= ch;
        }
        return (sortableBits << shift) ^ 0x80000000;
    }
}