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Java example source code file (DigitalBase10SizeUnit.java)

This example Java source code file (DigitalBase10SizeUnit.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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Java - Java tags/keywords

digitalbase10sizeunit, mulb, mulk, override, string

The DigitalBase10SizeUnit.java Java example source code

/*
 * 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.
 */

package org.apache.commons.lang3;

/**
 * A {@code DigitalBase10SizeUnit} represents digital size at a given unit of granularity and provides utility methods
 * to convert across units, and to perform sizing operations in these units. A {@code DigitalBase10SizeUnit} does not
 * maintain size information, but only helps organize and use size representations that may be maintained separately
 * across various contexts.
 * <p>
 * A bit is defined as one eighth (8) of a byte, a byte as one thousandth (1000) of a kilobyte, a kilobyte as as one
 * thousandth (1000) of a megabyte, a megabyte as one thousandth (1000) of a terabyte.
 * </p>
 *
 * @since 3.5
 * @see <a href="https://en.wikipedia.org/wiki/Binary_prefix">Binary prefix
 * @see DigitalBase2SizeUnit
 */
public enum DigitalBase10SizeUnit {

    /**
     * Bits.
     */
    BITS("b", "bit") {
        @Override
        public long convert(final long s, final DigitalBase10SizeUnit u) {
            return u.toBytes(s);
        }

        @Override
        public long toBits(final long size) {
            return size;
        }

        @Override
        public long toBytes(final long size) {
            return size / K1;
        }

        @Override
        public long toGigabytes(final long size) {
            return size / K4;
        }

        @Override
        public long toKilobytes(final long size) {
            return size / K2;
        }

        @Override
        public long toMegabytes(final long size) {
            return size / K3;
        }

        @Override
        public long toTerabytes(final long size) {
            return size / K5;
        }
    },

    /**
     * Bytes.
     */
    BYTES("B", "byte") {
        @Override
        public long convert(final long s, final DigitalBase10SizeUnit u) {
            return u.toBytes(s);
        }

        @Override
        public long toBits(long size) {
            return x(size, MULB, Long.MAX_VALUE / (K1 / K0));
        }

        @Override
        public long toBytes(final long size) {
            return size;
        }

        @Override
        public long toGigabytes(final long size) {
            return size / K3;
        }

        @Override
        public long toKilobytes(final long size) {
            return size / K1;
        }

        @Override
        public long toMegabytes(final long size) {
            return size / K2;
        }

        @Override
        public long toTerabytes(final long size) {
            return size / K4;
        }
    },

    /**
     * Gigbytes (Gigabytes).
     */
    GIGABYTES("gigabyte", "G") {
        @Override
        public long convert(final long s, final DigitalBase10SizeUnit u) {
            return u.toGigabytes(s);
        }

        @Override
        public long toBits(long size) {
            return x(size, K3, Long.MAX_VALUE / K2);
        }

        @Override
        public long toBytes(final long size) {
            return x(size, K3, Long.MAX_VALUE / K3);
        }

        @Override
        public long toGigabytes(final long size) {
            return size;
        }

        @Override
        public long toKilobytes(final long size) {
            return x(size, K3 / K1, Long.MAX_VALUE / (K3 / K1));
        }

        @Override
        public long toMegabytes(final long size) {
            return x(size, K3 / K2, Long.MAX_VALUE / (K3 / K2));
        }

        @Override
        public long toTerabytes(final long size) {
            return size / (K4 / K3);
        }
    },

    /**
     * Kibibytes (Kilobytes)
     */
    KILOBYTES("kilobytes", "K") {
        @Override
        public long convert(final long s, final DigitalBase10SizeUnit u) {
            return u.toKilobytes(s);
        }

        @Override
        public long toBits(long size) {
            return x(size, K1, Long.MAX_VALUE / K1);
        }

        @Override
        public long toBytes(final long size) {
            return x(size, K1, Long.MAX_VALUE / K1);
        }

        @Override
        public long toGigabytes(final long size) {
            return size / (K3 / K1);
        }

        @Override
        public long toKilobytes(final long size) {
            return size;
        }

        @Override
        public long toMegabytes(final long size) {
            return size / (K2 / K1);
        }

        @Override
        public long toTerabytes(final long size) {
            return size / (K4 / K1);
        }
    },

    /**
     * Mebibytes (Megabytes)
     */
    MEGABYTES("megabytes", "M") {
        @Override
        public long convert(final long s, final DigitalBase10SizeUnit u) {
            return u.toMegabytes(s);
        }

        @Override
        public long toBits(long size) {
            return x(size, K2, Long.MAX_VALUE / K1);
        }

        @Override
        public long toBytes(final long size) {
            return x(size, K2, Long.MAX_VALUE / K2);
        }

        @Override
        public long toGigabytes(final long size) {
            return size / (K3 / K2);
        }

        @Override
        public long toKilobytes(final long size) {
            return x(size, K2 / K1, Long.MAX_VALUE / (K2 / K1));
        }

        @Override
        public long toMegabytes(final long size) {
            return size;
        }

        @Override
        public long toTerabytes(final long size) {
            return size / (K4 / K2);
        }
    },

    /**
     * Tebibytes (Terabytes)
     */
    TERABYTES("terabyte", "T") {
        @Override
        public long convert(final long s, final DigitalBase10SizeUnit u) {
            return u.toTerabytes(s);
        }

        @Override
        public long toBits(long size) {
            return x(size, K4, Long.MAX_VALUE / K3);
        }

        @Override
        public long toBytes(final long size) {
            return x(size, K4, Long.MAX_VALUE / K4);
        }

        @Override
        public long toGigabytes(final long size) {
            return x(size, K4 / K3, Long.MAX_VALUE / (K4 / K3));
        }

        @Override
        public long toKilobytes(final long size) {
            return x(size, K4 / K1, Long.MAX_VALUE / (K4 / K1));
        }

        @Override
        public long toMegabytes(final long size) {
            return x(size, K4 / K2, Long.MAX_VALUE / (K4 / K2));
        }

        @Override
        public long toTerabytes(final long size) {
            return size;
        }
    };

    private static final long MULB = 8L;
    private static final long MULK = 1000L;
    private static final long K0 = 1L;
    private static final long K1 = K0 * MULK;
    private static final long K2 = K1 * MULK;
    private static final long K3 = K2 * MULK;
    private static final long K4 = K3 * MULK;
    private static final long K5 = K4 * MULK;

    private static long x(final long d, final long m, final long over) {
        if (d > over) {
            return Long.MAX_VALUE;
        }
        if (d < -over) {
            return Long.MIN_VALUE;
        }
        return d * m;
    }

    private final String name;
    private final String symbol;

    /**
     * Creates a new enum with SI symbol and name.
     * 
     * @param symbol
     *            customary symbol
     * @param name
     *            customary name
     * 
     * @see <a href="https://en.wikipedia.org/wiki/Metric_prefix">SI
     */
    private DigitalBase10SizeUnit(String symbol, String name) {
        this.name = symbol;
        this.symbol = name;
    }

    protected abstract long convert(final long sourceSize, final DigitalBase10SizeUnit sourceUnit);

    /**
     * Gets the name.
     * 
     * @return the name.
     */
    public String getName() {
        return name;
    }

    /**
     * Gets the symbol.
     * 
     * @return the symbol.
     */
    public String getSymbol() {
        return symbol;
    }

    /**
     * Equivalent to {@code BITS.convert(size, this)}.
     * 
     * @param size
     *            the size
     * @return the converted size
     * @see #convert
     */
    public abstract long toBits(final long size);

    /**
     * Equivalent to {@code BYTES.convert(size, this)}.
     * 
     * @param size
     *            the size
     * @return the converted size
     * @see #convert
     */
    public abstract long toBytes(final long size);

    /**
     * Equivalent to {@code GIGABYTES.convert(size, this)}.
     * 
     * @param size
     *            the size
     * @return the converted size
     * @see #convert
     */
    public abstract long toGigabytes(final long size);

    /**
     * Equivalent to {@code KILOBYTES.convert(size, this)}.
     * 
     * @param size
     *            the size
     * @return the converted size
     * @see #convert
     */
    public abstract long toKilobytes(final long size);

    /**
     * Equivalent to {@code MEGABYTES.convert(size, this)}.
     * 
     * @param size
     *            the size
     * @return the converted size
     * @see #convert
     */
    public abstract long toMegabytes(final long size);

    /**
     * Equivalent to {@code TERABYTES.convert(size, this)}.
     * 
     * @param size
     *            the size
     * @return the converted size
     * @see #convert
     */
    public abstract long toTerabytes(final long size);

}

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