Java example source code file (DecimalDV.java)

This example Java source code file (DecimalDV.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.

Learn more about this Java project at its project page.

Java - Java tags/keywords

bigdecimal, biginteger, decimaldv, invaliddatatypevalueexception, math, numberformatexception, object, override, string, stringbuilder, typevalidator, util, validationcontext, xdecimal, xsdecimal

The DecimalDV.java Java example source code

/*
 * reserved comment block
 * DO NOT REMOVE OR ALTER!
 */
/*
 * Copyright 2001,2002,2004,2005 The Apache Software Foundation.
 *
 * 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.
 */

package com.sun.org.apache.xerces.internal.impl.dv.xs;

import java.math.BigDecimal;
import java.math.BigInteger;

import com.sun.org.apache.xerces.internal.impl.dv.InvalidDatatypeValueException;
import com.sun.org.apache.xerces.internal.impl.dv.ValidationContext;
import com.sun.org.apache.xerces.internal.xs.datatypes.XSDecimal;
import java.util.Objects;

/**
 * Represent the schema type "decimal"
 *
 * @xerces.internal
 *
 * @author Neeraj Bajaj, Sun Microsystems, inc.
 * @author Sandy Gao, IBM
 *
 */
public class DecimalDV extends TypeValidator {

    @Override
    public final short getAllowedFacets(){
        return ( XSSimpleTypeDecl.FACET_PATTERN | XSSimpleTypeDecl.FACET_WHITESPACE | XSSimpleTypeDecl.FACET_ENUMERATION |XSSimpleTypeDecl.FACET_MAXINCLUSIVE |XSSimpleTypeDecl.FACET_MININCLUSIVE | XSSimpleTypeDecl.FACET_MAXEXCLUSIVE  | XSSimpleTypeDecl.FACET_MINEXCLUSIVE | XSSimpleTypeDecl.FACET_TOTALDIGITS | XSSimpleTypeDecl.FACET_FRACTIONDIGITS);
    }

    @Override
    public Object getActualValue(String content, ValidationContext context) throws InvalidDatatypeValueException {
        try {
            return new XDecimal(content);
        } catch (NumberFormatException nfe) {
            throw new InvalidDatatypeValueException("cvc-datatype-valid.1.2.1", new Object[]{content, "decimal"});
        }
    }

    @Override
    public final int compare(Object value1, Object value2){
        return ((XDecimal)value1).compareTo((XDecimal)value2);
    }

    @Override
    public final int getTotalDigits(Object value){
        return ((XDecimal)value).totalDigits;
    }

    @Override
    public final int getFractionDigits(Object value){
        return ((XDecimal)value).fracDigits;
    }

    // Avoid using the heavy-weight java.math.BigDecimal
    static final class XDecimal implements XSDecimal {
        // sign: 0 for vlaue 0; 1 for positive values; -1 for negative values
        int sign = 1;
        // total digits. >= 1
        int totalDigits = 0;
        // integer digits when sign != 0
        int intDigits = 0;
        // fraction digits when sign != 0
        int fracDigits = 0;
        // the string representing the integer part
        String ivalue = "";
        // the string representing the fraction part
        String fvalue = "";
        // whether the canonical form contains decimal point
        boolean integer = false;

        XDecimal(String content) throws NumberFormatException {
            initD(content);
        }
        XDecimal(String content, boolean integer) throws NumberFormatException {
            if (integer)
                initI(content);
            else
                initD(content);
        }
        void initD(String content) throws NumberFormatException {
            int len = content.length();
            if (len == 0)
                throw new NumberFormatException();

            // these 4 variables are used to indicate where the integre/fraction
            // parts start/end.
            int intStart = 0, intEnd = 0, fracStart = 0, fracEnd = 0;

            // Deal with leading sign symbol if present
            if (content.charAt(0) == '+') {
                // skip '+', so intStart should be 1
                intStart = 1;
            }
            else if (content.charAt(0) == '-') {
                // keep '-', so intStart is stil 0
                intStart = 1;
                sign = -1;
            }

            // skip leading zeroes in integer part
            int actualIntStart = intStart;
            while (actualIntStart < len && content.charAt(actualIntStart) == '0') {
                actualIntStart++;
            }

            // Find the ending position of the integer part
            for (intEnd = actualIntStart;
                 intEnd < len && TypeValidator.isDigit(content.charAt(intEnd));
                 intEnd++);

            // Not reached the end yet
            if (intEnd < len) {
                // the remaining part is not ".DDD", error
                if (content.charAt(intEnd) != '.')
                    throw new NumberFormatException();

                // fraction part starts after '.', and ends at the end of the input
                fracStart = intEnd + 1;
                fracEnd = len;
            }

            // no integer part, no fraction part, error.
            if (intStart == intEnd && fracStart == fracEnd)
                throw new NumberFormatException();

            // ignore trailing zeroes in fraction part
            while (fracEnd > fracStart && content.charAt(fracEnd-1) == '0') {
                fracEnd--;
            }

            // check whether there is non-digit characters in the fraction part
            for (int fracPos = fracStart; fracPos < fracEnd; fracPos++) {
                if (!TypeValidator.isDigit(content.charAt(fracPos)))
                    throw new NumberFormatException();
            }

            intDigits = intEnd - actualIntStart;
            fracDigits = fracEnd - fracStart;
            totalDigits = intDigits + fracDigits;

            if (intDigits > 0) {
                ivalue = content.substring(actualIntStart, intEnd);
                if (fracDigits > 0)
                    fvalue = content.substring(fracStart, fracEnd);
            }
            else {
                if (fracDigits > 0) {
                    fvalue = content.substring(fracStart, fracEnd);
                }
                else {
                    // ".00", treat it as "0"
                    sign = 0;
                }
            }
        }
        void initI(String content) throws NumberFormatException {
            int len = content.length();
            if (len == 0)
                throw new NumberFormatException();

            // these 2 variables are used to indicate where the integre start/end.
            int intStart = 0, intEnd = 0;

            // Deal with leading sign symbol if present
            if (content.charAt(0) == '+') {
                // skip '+', so intStart should be 1
                intStart = 1;
            }
            else if (content.charAt(0) == '-') {
                // keep '-', so intStart is stil 0
                intStart = 1;
                sign = -1;
            }

            // skip leading zeroes in integer part
            int actualIntStart = intStart;
            while (actualIntStart < len && content.charAt(actualIntStart) == '0') {
                actualIntStart++;
            }

            // Find the ending position of the integer part
            for (intEnd = actualIntStart;
                 intEnd < len && TypeValidator.isDigit(content.charAt(intEnd));
                 intEnd++);

            // Not reached the end yet, error
            if (intEnd < len)
                throw new NumberFormatException();

            // no integer part, error.
            if (intStart == intEnd)
                throw new NumberFormatException();

            intDigits = intEnd - actualIntStart;
            fracDigits = 0;
            totalDigits = intDigits;

            if (intDigits > 0) {
                ivalue = content.substring(actualIntStart, intEnd);
            }
            else {
                // "00", treat it as "0"
                sign = 0;
            }

            integer = true;
        }

        @Override
        public boolean equals(Object val) {
            if (val == this)
                return true;

            if (!(val instanceof XDecimal))
                return false;
            XDecimal oval = (XDecimal)val;

            if (sign != oval.sign)
               return false;
            if (sign == 0)
                return true;

            return intDigits == oval.intDigits && fracDigits == oval.fracDigits &&
                   ivalue.equals(oval.ivalue) && fvalue.equals(oval.fvalue);
        }

        @Override
        public int hashCode() {
            int hash = 7;
            hash = 17 * hash + this.sign;
            if (this.sign == 0) return hash;
            hash = 17 * hash + this.intDigits;
            hash = 17 * hash + this.fracDigits;
            hash = 17 * hash + Objects.hashCode(this.ivalue);
            hash = 17 * hash + Objects.hashCode(this.fvalue);
            return hash;
        }

        public int compareTo(XDecimal val) {
            if (sign != val.sign)
                return sign > val.sign ? 1 : -1;
            if (sign == 0)
                return 0;
            return sign * intComp(val);
        }
        private int intComp(XDecimal val) {
            if (intDigits != val.intDigits)
                return intDigits > val.intDigits ? 1 : -1;
            int ret = ivalue.compareTo(val.ivalue);
            if (ret != 0)
                return ret > 0 ? 1 : -1;;
            ret = fvalue.compareTo(val.fvalue);
            return ret == 0 ? 0 : (ret > 0 ? 1 : -1);
        }

        private String canonical;
        @Override
        public synchronized String toString() {
            if (canonical == null) {
                makeCanonical();
            }
            return canonical;
        }

        private void makeCanonical() {
            if (sign == 0) {
                if (integer)
                    canonical = "0";
                else
                    canonical = "0.0";
                return;
            }
            if (integer && sign > 0) {
                canonical = ivalue;
                return;
            }
            // for -0.1, total digits is 1, so we need 3 extra spots
            final StringBuilder buffer = new StringBuilder(totalDigits+3);
            if (sign == -1)
                buffer.append('-');
            if (intDigits != 0)
                buffer.append(ivalue);
            else
                buffer.append('0');
            if (!integer) {
                buffer.append('.');
                if (fracDigits != 0) {
                    buffer.append(fvalue);
                }
                else {
                    buffer.append('0');
                }
            }
            canonical = buffer.toString();
        }

        @Override
        public BigDecimal getBigDecimal() {
            if (sign == 0) {
                return new BigDecimal(BigInteger.ZERO);
            }
            return new BigDecimal(toString());
        }

        @Override
        public BigInteger getBigInteger() throws NumberFormatException {
            if (fracDigits != 0) {
                throw new NumberFormatException();
            }
            if (sign == 0) {
                return BigInteger.ZERO;
            }
            if (sign == 1) {
                return new BigInteger(ivalue);
            }
            return new BigInteger("-" + ivalue);
        }

        @Override
        public long getLong() throws NumberFormatException {
            if (fracDigits != 0) {
                throw new NumberFormatException();
            }
            if (sign == 0) {
                return 0L;
            }
            if (sign == 1) {
                return Long.parseLong(ivalue);
            }
            return Long.parseLong("-" + ivalue);
        }

        @Override
        public int getInt() throws NumberFormatException {
            if (fracDigits != 0) {
                throw new NumberFormatException();
            }
            if (sign == 0) {
                return 0;
            }
            if (sign == 1) {
                return Integer.parseInt(ivalue);
            }
            return Integer.parseInt("-" + ivalue);
        }

        @Override
        public short getShort() throws NumberFormatException {
            if (fracDigits != 0) {
                throw new NumberFormatException();
            }
            if (sign == 0) {
                return 0;
            }
            if (sign == 1) {
                return Short.parseShort(ivalue);
            }
            return Short.parseShort("-" + ivalue);
        }

        @Override
        public byte getByte() throws NumberFormatException {
            if (fracDigits != 0) {
                throw new NumberFormatException();
            }
            if (sign == 0) {
                return 0;
            }
            if (sign == 1) {
                return Byte.parseByte(ivalue);
            }
            return Byte.parseByte("-" + ivalue);
        }
    }
} // class DecimalDV