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/*
========== licence begin GPL
Copyright (C) 2002-2003 SAP AG
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
========== licence end
*/
package com.sap.dbtech.util.printf;
import com.sap.dbtech.util.*;
/**
*
*/
abstract class DataFormatter extends Formatter {
protected char kind;
protected int width = defaultValue_C;
protected int precision = defaultValue_C;
protected boolean alignRight = false;
protected char padChar = ' ';
protected static final int defaultValue_C = -1;
protected static final int dynamicValue_C = -2;
/**
*
* @param format java.lang.String
* @exception com.sap.dbtech.util.printf.FormatException The exception description.
*/
protected DataFormatter(String format) throws FormatException {
this.parseFormatString (format);
}
/**
*
* @return java.lang.String
* @param objects com.sap.dbtech.util.printf.OArrayEnumeration
* @exception com.sap.dbtech.util.printf.PrintfArgumentMismatch The exception description.
*/
String format (OArrayEnumeration objects) throws PrintfArgumentMismatch {
int actualWidth = this.width;
int actualPrecision = this.precision;
Number argValue;
Object obj;
String result;
try {
if (this.width == dynamicValue_C) {
argValue = (Number) objects.nextElement();
actualWidth = argValue.intValue ();
}
if (this.precision == dynamicValue_C) {
argValue = (Number) objects.nextElement();
actualPrecision = argValue.intValue ();
}
obj = objects.nextElement();
}
catch (ArrayIndexOutOfBoundsException exc) {
throw new PrintfArgumentMismatch(MessageTranslator.translate(MessageKey.ERROR_FORMAT_TOFEWARGS));
}
result = this.formatObject (obj, this.kind, actualWidth,
actualPrecision, this.alignRight, this.padChar);
return result;
}
/**
*
* @return java.lang.String
* @param obj java.lang.Object
* @param kind int
* @param width int
* @param prexision int
* @param alignRight boolean
* @param padChar char
*/
protected abstract String formatObject (Object obj, int kind, int width, int precision, boolean alignRight, char padChar)
throws PrintfArgumentMismatch;
/**
*
* @return java.lang.String
* @param obj java.lang.Object
* @param kind int
* @param width int
* @param prexision int
* @param alignRight boolean
* @param padChar char
*/
protected String formatString (String str, int kind, int width, int precision, boolean alignRight, char padChar)
{
if (width > str.length ()) {
if (alignRight) {
str = StringUtil.padLeft (str, width, padChar);
}
else {
str = StringUtil.padRight (str, width, padChar);
}
}
else if ((precision >= 0) && (precision < str.length ())) {
str = str.substring (0, precision);
}
return str;
}
/**
*
* @param format java.lang.String
* @exception com.sap.dbtech.util.printf.FormatException The exception description.
*/
private void parseFormatString (String format) throws FormatException {
boolean inFlags = true;
char current = 1;
int pos = 0; // skip over %
int intval;
if (format.charAt (0) != '%') {
throw new FormatException (MessageTranslator.translate(MessageKey.ERROR_FORMAT_PERCENT));
}
/*
* parse flags
*/
while (inFlags) {
++pos;
current = format.charAt (pos);
switch (current) {
case '-':
this.alignRight = true;
break;
case '+':
// not implemented: always a sign character
break;
case ' ':
// not implemented: blank instead of '+'
break;
case '#':
// not implemented: alternate form
break;
case '0':
this.padChar = '0';
break;
default:
inFlags = false;
break;
}
}
/*
* width
*/
if (current == '*') {
this.width = dynamicValue_C;
++pos;
current = format.charAt (pos);
}
else {
intval = 0;
while (('0' <= current) && (current <= '9')) {
intval *= 10;
intval += current - '0';
++pos;
current = format.charAt (pos);
}
if (intval != 0) {
this.width = intval;
}
}
/*
* precision
*/
if (current == '.') {
++pos;
current = format.charAt (pos);
if (current == '*') {
this.width = dynamicValue_C;
++pos;
current = format.charAt (pos);
}
else {
intval = 0;
while (('0' <= current) && (current <= '9')) {
intval *= 10;
intval += current - '0';
++pos;
current = format.charAt (pos);
}
if (intval != 0) {
this.precision = intval;
}
}
}
/*
* kind
*/
this.kind = current;
}
}
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