| 1 | package ise.antelope.tasks.util.math;
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| 2 |
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| 3 |
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| 4 | /**
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| 5 | * Represents a number.
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| 6 | * <p>Copyright 2003, Dale Anson, all rights reserved
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| 7 | * @author Dale Anson, [email protected]
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| 8 | */
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| 9 | public class Num {
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| 10 |
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| 11 | // the value of this number
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| 12 | private String value = null;
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| 13 |
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| 14 | private String datatype = null;
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| 15 |
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| 16 | public Num() {
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| 17 | }
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| 18 |
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| 19 | public Num( String value ) {
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| 20 | setValue( value );
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| 21 | }
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| 22 |
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| 23 | /**
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| 24 | * Set the value for this number. This string must parse to the set
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| 25 | * datatype, for example, setting value to "7.992" and datatype to INT
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| 26 | * will cause a number format exception to be thrown. Supports two special
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| 27 | * numbers, "E" and "PI".
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| 28 | * @param value the value for this number
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| 29 | */
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| 30 | public void setValue( String value ) {
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| 31 | if ( value.equals( "E" ) )
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| 32 | value = String.valueOf( java.lang.Math.E );
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| 33 | else if ( value.equals( "PI" ) )
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| 34 | value = String.valueOf( java.lang.Math.PI );
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| 35 | this.value = value;
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| 36 | }
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| 37 |
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| 38 | /**
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| 39 | * @return the value for this number as a Number. Cast as appropriate to
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| 40 | * Integer, Long, Float, or Double.
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| 41 | */
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| 42 | public Number getValue() {
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| 43 | try {
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| 44 | if ( datatype == null )
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| 45 | datatype = "double";
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| 46 | if ( datatype.equals( "int" ) )
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| 47 | return new Integer( value );
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| 48 | if ( datatype.equals( "long" ) )
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| 49 | return new Long( value );
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| 50 | if ( datatype.equals( "float" ) )
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| 51 | return new Float( value );
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| 52 | if ( datatype.equals( "double" ) )
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| 53 | return new Double( value );
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| 54 | if ( datatype.equals( "bigint" ) )
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| 55 | return new java.math.BigInteger( value );
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| 56 | if ( datatype.equals( "bigdecimal" ) )
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| 57 | return new java.math.BigDecimal( value );
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| 58 | throw new RuntimeException( "Invalid datatype." );
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| 59 | }
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| 60 | catch ( NumberFormatException nfe ) {
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| 61 | return new Double( value );
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| 62 | }
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| 63 | }
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| 64 |
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| 65 | /**
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| 66 | * Sets the datatype of this number. Allowed values are
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| 67 | * "int", "long", "float", or "double".
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| 68 | */
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| 69 | public void setDatatype( String p ) {
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| 70 | datatype = p;
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| 71 | }
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| 72 |
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| 73 | /**
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| 74 | * @return the datatype as one of the defined types.
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| 75 | */
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| 76 | public String getDatatype() {
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| 77 | if ( datatype == null )
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| 78 | datatype = "double";
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| 79 | return datatype;
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| 80 | }
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| 81 |
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| 82 | public String toString() {
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| 83 | if (value == null)
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| 84 | return null;
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| 85 | return getValue().toString();
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| 86 | }
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| 87 | }
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| 88 |
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