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The Apache PDFBox library is an open source Java tool for working with PDF documents.
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.pdfbox.cos;
import java.io.IOException;
import java.io.OutputStream;
import java.math.BigDecimal;
/**
* This class represents a floating point number in a PDF document.
*
* @author Ben Litchfield
*
*/
public class COSFloat extends COSNumber
{
private BigDecimal value;
private String valueAsString;
/**
* Constructor.
*
* @param aFloat The primitive float object that this object wraps.
*/
public COSFloat( float aFloat )
{
// use a BigDecimal as intermediate state to avoid
// a floating point string representation of the float value
value = new BigDecimal(String.valueOf(aFloat));
valueAsString = removeNullDigits(value.toPlainString());
}
/**
* Constructor.
*
* @param aFloat The primitive float object that this object wraps.
*
* @throws IOException If aFloat is not a float.
*/
public COSFloat( String aFloat ) throws IOException
{
try
{
valueAsString = aFloat;
value = new BigDecimal( valueAsString );
checkMinMaxValues();
}
catch( NumberFormatException e )
{
if (aFloat.matches("^0\\.0+\\-\\d+"))
{
// PDFBOX-2990 has 0.00000-33917698
// PDFBOX-3369 has 0.00-35095424
try
{
valueAsString = "-" + valueAsString.replaceFirst("\\-", "");
value = new BigDecimal(valueAsString);
checkMinMaxValues();
}
catch (NumberFormatException e2)
{
throw new IOException("Error expected floating point number actual='" + aFloat + "'", e2);
}
}
else
{
throw new IOException("Error expected floating point number actual='" + aFloat + "'", e);
}
}
}
private void checkMinMaxValues()
{
float floatValue = value.floatValue();
double doubleValue = value.doubleValue();
boolean valueReplaced = false;
// check for huge values
if (floatValue == Float.NEGATIVE_INFINITY || floatValue == Float.POSITIVE_INFINITY )
{
if (Math.abs(doubleValue) > Float.MAX_VALUE)
{
floatValue = Float.MAX_VALUE * (floatValue == Float.POSITIVE_INFINITY ? 1 : -1);
valueReplaced = true;
}
}
// check for very small values
else if (floatValue == 0 && doubleValue != 0)
{
if (Math.abs(doubleValue) < Float.MIN_NORMAL )
{
floatValue = Float.MIN_NORMAL;
floatValue *= doubleValue >= 0 ? 1 : -1;
valueReplaced = true;
}
}
if (valueReplaced)
{
value = new BigDecimal(floatValue);
valueAsString = removeNullDigits(value.toPlainString());
}
}
private String removeNullDigits(String plainStringValue)
{
// remove fraction digit "0" only
if (plainStringValue.indexOf('.') > -1 && !plainStringValue.endsWith(".0"))
{
while (plainStringValue.endsWith("0") && !plainStringValue.endsWith(".0"))
{
plainStringValue = plainStringValue.substring(0,plainStringValue.length()-1);
}
}
return plainStringValue;
}
/**
* The value of the float object that this one wraps.
*
* @return The value of this object.
*/
@Override
public float floatValue()
{
return value.floatValue();
}
/**
* The value of the double object that this one wraps.
*
* @return The double of this object.
*/
@Override
public double doubleValue()
{
return value.doubleValue();
}
/**
* This will get the long value of this object.
*
* @return The long value of this object,
*/
@Override
public long longValue()
{
return value.longValue();
}
/**
* This will get the integer value of this object.
*
* @return The int value of this object,
*/
@Override
public int intValue()
{
return value.intValue();
}
/**
* {@inheritDoc}
*/
@Override
public boolean equals( Object o )
{
return o instanceof COSFloat &&
Float.floatToIntBits(((COSFloat)o).value.floatValue()) == Float.floatToIntBits(value.floatValue());
}
/**
* {@inheritDoc}
*/
@Override
public int hashCode()
{
return value.hashCode();
}
/**
* {@inheritDoc}
*/
@Override
public String toString()
{
return "COSFloat{" + valueAsString + "}";
}
/**
* visitor pattern double dispatch method.
*
* @param visitor The object to notify when visiting this object.
* @return any object, depending on the visitor implementation, or null
* @throws IOException If an error occurs while visiting this object.
*/
@Override
public Object accept(ICOSVisitor visitor) throws IOException
{
return visitor.visitFromFloat(this);
}
/**
* This will output this string as a PDF object.
*
* @param output The stream to write to.
* @throws IOException If there is an error writing to the stream.
*/
public void writePDF( OutputStream output ) throws IOException
{
output.write(valueAsString.getBytes("ISO-8859-1"));
}
}