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/*
* Copyright 1999-2005 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.
*/
/* $Id$ */
package org.apache.fop.pdf;
import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.util.Locale;
/**
* This class represents a simple number object. It also contains contains some
* utility methods for outputing numbers to PDF.
*/
public class PDFNumber extends PDFObject {
private Number number;
/**
* Returns the number.
* @return the number
*/
public Number getNumber() {
return this.number;
}
/**
* Sets the number.
* @param number the number
*/
public void setNumber(Number number) {
this.number = number;
}
/**
* Output a Double value to a string suitable for PDF.
*
* @param doubleDown the Double value
* @return the value as a string
*/
public static String doubleOut(Double doubleDown) {
return doubleOut(doubleDown.doubleValue());
}
/**
* Output a double value to a string suitable for PDF (6 decimal digits).
*
* @param doubleDown the double value
* @return the value as a string
*/
public static String doubleOut(double doubleDown) {
return doubleOut(doubleDown, 6);
}
// Static cache. Possible concurrency implications. See comment in doubleOut(double, int).
private static DecimalFormat[] decimalFormatCache = new DecimalFormat[17];
private static final String BASE_FORMAT = "0.################";
/**
* Output a double value to a string suitable for PDF.
* In this method it is possible to set the maximum
* number of decimal places to output.
*
* @param doubleDown the Double value
* @param dec the number of decimal places to output
* @return the value as a string
*/
public static String doubleOut(double doubleDown, int dec) {
if (dec < 0 || dec >= decimalFormatCache.length) {
throw new IllegalArgumentException("Parameter dec must be between 1 and "
+ (decimalFormatCache.length + 1));
}
if (decimalFormatCache[dec] == null) {
//We don't care about the rare case where a DecimalFormat might be replaced in
//a multi-threaded environment, so we don't synchronize the access to the static
//array (mainly for performance reasons). After all, the DecimalFormat instances
//read-only objects so it doesn't matter which instance is used as long as one
//is available.
String s = "0";
if (dec > 0) {
s = BASE_FORMAT.substring(0, dec + 2);
}
DecimalFormat df = new DecimalFormat(s, new DecimalFormatSymbols(Locale.US));
decimalFormatCache[dec] = df;
}
return decimalFormatCache[dec].format(doubleDown);
}
/**
* @see org.apache.fop.pdf.PDFObject#toPDFString()
*/
protected String toPDFString() {
if (getNumber() == null) {
throw new IllegalArgumentException(
"The number of this PDFNumber must not be empty");
}
StringBuffer sb = new StringBuffer(64);
sb.append(getObjectID());
sb.append(getNumber().toString());
sb.append("\nendobj\n");
return sb.toString();
}
}
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