Java BigDecimal Create toBigDecimal(Object obj)

Description

to Big Decimal

License

Apache License

Declaration

public static BigDecimal toBigDecimal(Object obj)

Method Source Code

//package com.java2s;
/*/*from www  .j av  a  2s .  com*/
 * Copyright 2004-2011 the Seasar Foundation and the Others.
 *
 * Licensed 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.ByteArrayInputStream;

import java.io.IOException;
import java.io.ObjectInputStream;

import java.io.PrintWriter;
import java.io.Serializable;
import java.io.StringWriter;

import java.math.BigDecimal;

import java.text.DateFormat;
import java.text.DecimalFormat;

import java.text.SimpleDateFormat;

import java.util.Calendar;
import java.util.Date;

public class Main {
    private static final char[] ENCODE_TABLE = { 'A', 'B', 'C', 'D', 'E',
            'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q',
            'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c',
            'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
            'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0',
            '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/' };
    private static final char PAD = '=';

    public static BigDecimal toBigDecimal(Object obj) {
        return toBigDecimal(obj, null);
    }

    public static BigDecimal toBigDecimal(Object obj, String pattern) {
        if (obj == null) {
            return null;
        } else if (obj instanceof BigDecimal) {
            final BigDecimal paramBigDecimal = (BigDecimal) obj;
            if (BigDecimal.class.equals(paramBigDecimal.getClass())) { // pure big-decimal
                return paramBigDecimal;
            } else { // sub class
                // because the big-decimal type is not final class.
                return new BigDecimal(paramBigDecimal.toPlainString());
            }
        } else if (obj instanceof java.util.Date) {
            if (pattern != null) {
                return new BigDecimal(createDateFormat(pattern).format(obj));
            }
            return BigDecimal.valueOf(((java.util.Date) obj).getTime());
        } else if (obj instanceof String) {
            String s = (String) obj;
            if (s == null || s.trim().length() == 0) {
                return null;
            }
            return new BigDecimal(new BigDecimal(s).toPlainString());
        } else if (obj instanceof byte[]) {
            return toBigDecimal(toSerializable((byte[]) obj)); // recursive
        } else {
            return new BigDecimal(
                    new BigDecimal(obj.toString()).toPlainString());
        }
    }

    public static DateFormat createDateFormat(String pattern) { // as lenient
        return createDateFormat(pattern, false);
    }

    public static DateFormat createDateFormat(String pattern, boolean strict) {
        if (pattern == null) {
            String msg = "The argument 'pattern' should not be null!";
            throw new IllegalArgumentException(msg);
        }
        final SimpleDateFormat sdf = new SimpleDateFormat(pattern);
        sdf.setLenient(!strict);
        return sdf;
    }

    public static Serializable toSerializable(byte[] bytes) {
        if (bytes == null) {
            return null;
        }
        try {
            final ByteArrayInputStream bais = new ByteArrayInputStream(
                    bytes);
            final ObjectInputStream ois = new ObjectInputStream(bais);
            try {
                return (Serializable) ois.readObject();
            } finally {
                ois.close();
            }
        } catch (Exception e) {
            String msg = "Failed to convert the object to binary: bytes.length="
                    + bytes.length;
            throw new IllegalStateException(msg, e);
        }
    }

    /**
     * Convert the object to the instance that is string. <br />
     * If the object is a byte array, encode as base64.
     * And if the object is a exception (throw-able), convert to stack-trace.
     * @param obj The parsed object. (NullAllowed)
     * @return The instance of string. (NullAllowed)
     */
    public static String toString(Object obj) {
        return toString(obj, null);
    }

    /**
     * Convert the object to the instance that is string. <br />
     * If the object is a byte array, encode as base64.
     * And if the object is a exception (throw-able), convert to stack-trace.
     * @param obj The parsed object. (NullAllowed)
     * @param pattern The pattern format to parse. (NullAllowed)
     * @return The instance of string. (NullAllowed)
     */
    public static String toString(Object obj, String pattern) {
        if (obj == null) {
            return null;
        } else if (obj instanceof String) {
            return (String) obj;
        } else if (obj instanceof Date) {
            return toStringFromDate((Date) obj, pattern);
        } else if (obj instanceof Number) {
            return toStringFromNumber((Number) obj, pattern);
        } else if (obj instanceof Calendar) {
            return toStringFromDate(((Calendar) obj).getTime(), pattern);
        } else if (obj instanceof byte[]) {
            return encodeAsBase64((byte[]) obj);
        } else if (obj instanceof Throwable) {
            return toStringStackTrace((Throwable) obj);
        } else {
            return obj.toString();
        }
    }

    protected static String toStringFromDate(Date value, String pattern) {
        if (value != null) {
            if (pattern != null) {
                return createDateFormat(pattern).format(value);
            }
            return value.toString();
        }
        return null;
    }

    protected static String toStringFromNumber(Number value, String pattern) {
        if (value != null) {
            if (pattern != null) {
                return createDecimalFormat(pattern).format(value);
            }
            return value.toString();
        }
        return null;
    }

    public static String encodeAsBase64(final byte[] inData) {
        if (inData == null || inData.length == 0) {
            return "";
        }
        int mod = inData.length % 3;
        int num = inData.length / 3;
        char[] outData = null;
        if (mod != 0) {
            outData = new char[(num + 1) * 4];
        } else {
            outData = new char[num * 4];
        }
        for (int i = 0; i < num; i++) {
            encode(inData, i * 3, outData, i * 4);
        }
        switch (mod) {
        case 1:
            encode2pad(inData, num * 3, outData, num * 4);
            break;
        case 2:
            encode1pad(inData, num * 3, outData, num * 4);
            break;
        }
        return new String(outData);
    }

    protected static String toStringStackTrace(Throwable t) {
        StringWriter sw = null;
        try {
            sw = new StringWriter();
            t.printStackTrace(new PrintWriter(sw));
            return sw.toString();
        } finally {
            if (sw != null) {
                try {
                    sw.close();
                } catch (IOException e) {
                }
            }
        }
    }

    public static DecimalFormat createDecimalFormat(String pattern) {
        return new DecimalFormat(pattern);
    }

    private static void encode(final byte[] inData, final int inIndex,
            final char[] outData, final int outIndex) {
        int i = ((inData[inIndex] & 0xff) << 16)
                + ((inData[inIndex + 1] & 0xff) << 8)
                + (inData[inIndex + 2] & 0xff);
        outData[outIndex] = ENCODE_TABLE[i >> 18];
        outData[outIndex + 1] = ENCODE_TABLE[(i >> 12) & 0x3f];
        outData[outIndex + 2] = ENCODE_TABLE[(i >> 6) & 0x3f];
        outData[outIndex + 3] = ENCODE_TABLE[i & 0x3f];
    }

    private static void encode2pad(final byte[] inData, final int inIndex,
            final char[] outData, final int outIndex) {
        int i = inData[inIndex] & 0xff;
        outData[outIndex] = ENCODE_TABLE[i >> 2];
        outData[outIndex + 1] = ENCODE_TABLE[(i << 4) & 0x3f];
        outData[outIndex + 2] = PAD;
        outData[outIndex + 3] = PAD;
    }

    private static void encode1pad(final byte[] inData, final int inIndex,
            final char[] outData, final int outIndex) {
        int i = ((inData[inIndex] & 0xff) << 8)
                + (inData[inIndex + 1] & 0xff);
        outData[outIndex] = ENCODE_TABLE[i >> 10];
        outData[outIndex + 1] = ENCODE_TABLE[(i >> 4) & 0x3f];
        outData[outIndex + 2] = ENCODE_TABLE[(i << 2) & 0x3f];
        outData[outIndex + 3] = PAD;
    }
}

Java BigDecimal Create toBigDecimal(Object obj)

Description

License

Declaration

Method Source Code

Related