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# File: Number.pm |
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# Author: David Winters |
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# RCS: $Id: Number.pm,v 1.6 2000/02/08 02:36:40 winters Exp winters $ |
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# |
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# A floating point and integer class. |
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# |
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# This file contains POD documentation that may be viewed with the |
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# perldoc, pod2man, or pod2html utilities. |
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# |
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# Copyright (c) 1998-2000 David Winters. All rights reserved. |
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# This program is free software; you can redistribute it |
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# and/or modify it under the same terms as Perl itself. |
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######################################################################## |
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package Persistent::DataType::Number; |
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require 5.004; |
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use strict; |
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use vars qw($VERSION $REVISION @ISA); |
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### we are a subclass of the all-powerful Persistent::DataType::Base class ### |
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use Persistent::DataType::Base; |
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@ISA = qw(Persistent::DataType::Base); |
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use Carp; |
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### copy version number from superclass ### |
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$VERSION = $Persistent::DataType::Base::VERSION; |
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$REVISION = (qw$Revision: 1.6 $)[1]; |
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=head1 NAME |
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Persistent::DataType::Number - A Floating Point and Integer Class |
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=head1 SYNOPSIS |
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use Persistent::DataType::Number; |
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use English; |
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eval { ### in case an exception is thrown ### |
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### allocate a number ### |
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my $number = new Persistent::DataType::Number($value, |
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$precision, |
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$scale); |
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### get/set value of number ### |
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$value = $number->value($new_value); |
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### get/set precision of the number ### |
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$precision = $number->precision($new_precision); |
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### get/set scale of number ### |
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$scale = $number->scale($new_scale); |
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### returns '<=>' for numbers ### |
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my $cmp_op = $number->get_compare_op(); |
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}; |
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if ($EVAL_ERROR) { ### catch those exceptions! ### |
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print "An error occurred: $EVAL_ERROR\n"; |
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} |
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=head1 ABSTRACT |
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This is a floating point and integer class used by the Persistent |
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framework of classes to implement the attributes of objects. This |
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class provides methods for accessing the value, precision, scale, and |
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comparison operator of a number. |
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This class is usually not invoked directly, at least not when used |
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with the Persistent framework of classes. However, the constructor |
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arguments of this class are usually of interest when defining the |
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attributes of a Persistent object since the I method of |
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the Persistent classes instantiates this class directly. Also, the |
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arguments to the I method are of interest when dealing with the |
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accessor methods of the Persistent classes since the accessor methods |
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pass their arguments to the I method and return the string |
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value from the I method. |
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This class is part of the Persistent base package which is available |
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from: |
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http://www.bigsnow.org/persistent |
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ftp://ftp.bigsnow.org/pub/persistent |
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=head1 DESCRIPTION |
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Before we get started describing the methods in detail, it should be |
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noted that all error handling in this class is done with exceptions. |
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So you should wrap an eval block around all of your code. Please see |
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the L documentation for more information on exception |
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handling in Perl. |
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=head1 METHODS |
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=cut |
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######################################################################## |
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# |
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# -------------------------------------------------------------------- |
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# PUBLIC ABSTRACT METHODS OVERRIDDEN (REDEFINED) FROM THE PARENT CLASS |
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# -------------------------------------------------------------------- |
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# |
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######################################################################## |
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######################################################################## |
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# initialize |
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######################################################################## |
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=head2 Constructor -- Creates the Number Object |
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eval { |
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my $number = new Persistent::DataType::Number($value, |
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$precision, |
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$scale); |
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}; |
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croak "Exception caught: $@" if $@; |
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Initializes a number object. This method throws Perl execeptions so |
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use it with an eval block. |
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Parameters: |
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=over 4 |
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=item I<$value> |
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Actual value of the number; this may be a floating point or integer. |
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This argument is optional and may be set to undef. |
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=item I<$precision> |
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The number of digits in the number not including the decimal point or |
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the sign. This argument is optional and will be initialized to the |
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precision of the I<$value> argument as a default. |
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=item I<$scale> |
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The number of digits after the decimal point. This argument is |
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optional and will be initialized to the scale of the I<$value> |
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argument as a default. |
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=back |
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=cut |
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sub initialize { |
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my($this, $value, $precision, $scale) = @_; |
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$this->_trace(); |
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### parse out the digits before and after the decimal point ### |
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my($before, $after) = _parse_number($value); |
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### set the attributes ### |
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$precision = length($before) + length($after) if !defined($precision); |
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$this->precision($precision); |
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$scale = length($after) if !defined($scale); |
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$this->scale($scale); |
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$this->value($value); |
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} |
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######################################################################## |
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# value |
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######################################################################## |
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=head2 value -- Accesses the Value of the Number |
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eval { |
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### set the value ### |
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$number->value($value); |
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### get the value ### |
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$value = $number->value(); |
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}; |
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croak "Exception caught: $@" if $@; |
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Sets the value of the number and/or returns the value. This method |
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throws Perl execeptions so use it with an eval block. |
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Parameters: |
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=over 4 |
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=item I<$value> |
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Actual value of the number; this may be a floating point or integer. |
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This argument is optional and may be set to undef. |
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=back |
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=cut |
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sub value { |
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(@_ == 1 || @_ == 2) or croak 'Usage: $obj->value([$value])'; |
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my $this = shift; |
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ref($this) or croak "$this is not an object"; |
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$this->_trace(); |
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### set the value ### |
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if (@_) { |
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my $value = shift; |
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$value = undef if defined $value && $value eq ''; |
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### parse out the digits before and after the decimal point ### |
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my($before, $after) = _parse_number($value); |
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### get the precision and scale of the object ### |
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my $precision = $this->precision(); |
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my $scale = $this->scale(); |
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### check the length ### |
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if (length($before) + length($after) > $precision) { |
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croak "'$value' is longer than $precision digit(s) of precision"; |
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} elsif (length($after) > $scale) { |
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croak "'$value' is longer than $scale digit(s) of scale"; |
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} else { |
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$value = $value + 0 if defined $value; ### force numeric context ### |
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$this->{Data}->{Value} = $value; |
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} |
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} |
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### return the value ### |
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$this->{Data}->{Value}; |
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} |
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######################################################################## |
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# get_compare_op |
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######################################################################## |
233
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234
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=head2 get_compare_op -- Returns the Comparison Operator |
235
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236
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$cmp_op = $number->get_compare_op(); |
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Returns the comparison operator for the Number class which is '<=>'. |
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This method does not throw execeptions. |
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Parameters: |
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=over 4 |
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=item None |
246
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247
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=back |
248
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249
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=cut |
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251
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sub get_compare_op { |
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1
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(@_ == 1) or croak 'Usage: $obj->get_compare_op()'; |
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my $this = shift; |
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ref($this) or croak "$this is not an object"; |
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$this->_trace(); |
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0
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'<=>'; ### number comparison operator ### |
259
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} |
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######################################################################## |
262
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# |
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# -------------- |
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# PUBLIC METHODS |
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# -------------- |
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# |
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######################################################################## |
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269
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######################################################################## |
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# precision |
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######################################################################## |
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273
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=head2 precision -- Accesses the Precision of the Number |
274
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275
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eval { |
276
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### set the precision ### |
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$number->precision($new_precision); |
278
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279
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### get the precision ### |
280
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$precision = $number->precision(); |
281
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}; |
282
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croak "Exception caught: $@" if $@; |
283
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284
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Sets the precision of the number and/or returns it. This method |
285
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throws Perl execeptions so use it with an eval block. |
286
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287
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Parameters: |
288
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289
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=over 4 |
290
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291
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=item I<$precision> |
292
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293
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The number of digits in the number not including the decimal point or |
294
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the sign. The precision must be >= 0. If it is undef or the empty |
295
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string (''), then it is set to 0. |
296
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297
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=back |
298
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299
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=cut |
300
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301
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sub precision { |
302
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41
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50
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66
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41
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1
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145
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(@_ == 1 || @_ == 2) or croak 'Usage: $obj->precision([$precision])'; |
303
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41
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46
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my $this = shift; |
304
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41
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50
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83
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ref($this) or croak "$this is not an object"; |
305
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306
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41
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106
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$this->_trace(); |
307
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308
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### set the precision ### |
309
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41
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100
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90
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if (@_) { |
310
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11
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15
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my $precision = shift; |
311
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11
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50
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33
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66
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$precision = 0 if !defined($precision) || $precision eq ''; |
312
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11
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50
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29
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croak "precision ($precision) must be >= 0" if $precision < 0; |
313
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11
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33
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$this->{Data}->{Precision} = $precision; |
314
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315
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|
### check that the value is not too long ### |
316
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11
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|
36
|
my $value = $this->value(); |
317
|
11
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50
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36
|
if (defined $value) { |
318
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0
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0
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$value =~ s/[\-\.]//g; |
319
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0
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0
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0
|
if (length($value) > $precision) { |
320
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0
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0
|
croak(sprint("'%s' is longer than $precision digit(s) of precision", |
321
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$this->value())); |
322
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} |
323
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} |
324
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|
} |
325
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326
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|
|
### return the precision ### |
327
|
41
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|
|
|
|
100
|
$this->{Data}->{Precision}; |
328
|
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|
} |
329
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330
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|
######################################################################## |
331
|
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|
# scale |
332
|
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|
######################################################################## |
333
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334
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|
|
=head2 scale -- Accesses the Scale of the Number |
335
|
|
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|
|
|
336
|
|
|
|
|
|
|
eval { |
337
|
|
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|
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|
|
### set the scale ### |
338
|
|
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|
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|
|
$number->scale($new_scale); |
339
|
|
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|
|
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340
|
|
|
|
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|
|
### get the scale ### |
341
|
|
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|
|
|
|
$scale = $number->scale(); |
342
|
|
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|
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|
|
}; |
343
|
|
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|
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|
|
croak "Exception caught: $@" if $@; |
344
|
|
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|
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|
|
|
345
|
|
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|
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|
|
Sets the scale of the number and/or returns it. This method throws |
346
|
|
|
|
|
|
|
Perl execeptions so use it with an eval block. |
347
|
|
|
|
|
|
|
|
348
|
|
|
|
|
|
|
Parameters: |
349
|
|
|
|
|
|
|
|
350
|
|
|
|
|
|
|
=over 4 |
351
|
|
|
|
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|
|
|
352
|
|
|
|
|
|
|
=item I<$scale> |
353
|
|
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|
|
354
|
|
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|
|
The number of digits after the decimal point. The scale must be >= 0. |
355
|
|
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|
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|
|
If it is undef or the empty string (''), then it is set to 0. |
356
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|
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|
357
|
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|
|
=back |
358
|
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|
|
359
|
|
|
|
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|
|
=cut |
360
|
|
|
|
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|
|
|
361
|
|
|
|
|
|
|
sub scale { |
362
|
41
|
50
|
66
|
41
|
1
|
145
|
(@_ == 1 || @_ == 2) or croak 'Usage: $obj->scale([$scale])'; |
363
|
41
|
|
|
|
|
45
|
my $this = shift; |
364
|
41
|
50
|
|
|
|
92
|
ref($this) or croak "$this is not an object"; |
365
|
|
|
|
|
|
|
|
366
|
41
|
|
|
|
|
103
|
$this->_trace(); |
367
|
|
|
|
|
|
|
|
368
|
|
|
|
|
|
|
### set the scale ### |
369
|
41
|
100
|
|
|
|
82
|
if (@_) { |
370
|
11
|
|
|
|
|
17
|
my $scale = shift; |
371
|
11
|
50
|
33
|
|
|
64
|
$scale = 0 if !defined($scale) || $scale eq ''; |
372
|
11
|
50
|
|
|
|
25
|
croak "scale ($scale) must be >= 0" if $scale < 0; |
373
|
11
|
|
|
|
|
46
|
$this->{Data}->{Scale} = $scale; |
374
|
|
|
|
|
|
|
|
375
|
|
|
|
|
|
|
### check that the value is not too long ### |
376
|
11
|
|
|
|
|
36
|
my $value = $this->value(); |
377
|
11
|
50
|
|
|
|
45
|
if (defined $value) { |
378
|
0
|
0
|
|
|
|
0
|
if ($value =~ /^\d*\.(\d*)$/) { |
379
|
0
|
0
|
|
|
|
0
|
if (length($1) > $scale) { |
380
|
0
|
|
|
|
|
0
|
croak(sprint("'%s' is longer than $scale digit(s) of scale", |
381
|
|
|
|
|
|
|
$this->value())); |
382
|
|
|
|
|
|
|
} |
383
|
|
|
|
|
|
|
} |
384
|
|
|
|
|
|
|
} |
385
|
|
|
|
|
|
|
} |
386
|
|
|
|
|
|
|
|
387
|
|
|
|
|
|
|
### return the scale ### |
388
|
41
|
|
|
|
|
89
|
$this->{Data}->{Scale}; |
389
|
|
|
|
|
|
|
} |
390
|
|
|
|
|
|
|
|
391
|
|
|
|
|
|
|
######################################################################## |
392
|
|
|
|
|
|
|
# |
393
|
|
|
|
|
|
|
# --------------- |
394
|
|
|
|
|
|
|
# PRIVATE METHODS |
395
|
|
|
|
|
|
|
# --------------- |
396
|
|
|
|
|
|
|
# |
397
|
|
|
|
|
|
|
# NOTE: These methods do not need to be overridden in the subclasses. |
398
|
|
|
|
|
|
|
# However, you may certainly override these methods if you see |
399
|
|
|
|
|
|
|
# the need to. |
400
|
|
|
|
|
|
|
# |
401
|
|
|
|
|
|
|
######################################################################## |
402
|
|
|
|
|
|
|
|
403
|
|
|
|
|
|
|
######################################################################## |
404
|
|
|
|
|
|
|
# Function: _parse_number |
405
|
|
|
|
|
|
|
# Description: Parses the number into digits before and after the |
406
|
|
|
|
|
|
|
# decimal point. Insignificant trailing zeroes will be |
407
|
|
|
|
|
|
|
# truncated. |
408
|
|
|
|
|
|
|
# Parameters: None |
409
|
|
|
|
|
|
|
# Returns: None |
410
|
|
|
|
|
|
|
######################################################################## |
411
|
|
|
|
|
|
|
sub _parse_number { |
412
|
41
|
|
|
41
|
|
60
|
my $value = shift; |
413
|
|
|
|
|
|
|
|
414
|
41
|
|
|
|
|
51
|
my $before = ''; |
415
|
41
|
|
|
|
|
45
|
my $after = ''; |
416
|
|
|
|
|
|
|
|
417
|
41
|
100
|
|
|
|
89
|
if (defined $value) { |
418
|
19
|
50
|
|
|
|
110
|
if ($value =~ /^[+-]?(\d*)\.?(\d*)$/) { |
419
|
19
|
|
|
|
|
53
|
$before = $1; $after = $2; |
|
19
|
|
|
|
|
40
|
|
420
|
19
|
|
|
|
|
30
|
$after =~ s/0+$//; ### remove trailing zeroes ### |
421
|
|
|
|
|
|
|
} else { |
422
|
0
|
|
|
|
|
0
|
croak "'$value' is not a number"; |
423
|
|
|
|
|
|
|
} |
424
|
|
|
|
|
|
|
} |
425
|
|
|
|
|
|
|
|
426
|
41
|
|
|
|
|
136
|
($before, $after); |
427
|
|
|
|
|
|
|
} |
428
|
|
|
|
|
|
|
|
429
|
|
|
|
|
|
|
### end of library ### |
430
|
|
|
|
|
|
|
1; |
431
|
|
|
|
|
|
|
__END__ |