package com.tom_roush.pdfbox.cos;
import java.io.IOException;
import java.io.OutputStream;
/**
* This class represents an integer number in a PDF document.
*
* @author Ben Litchfield
*/
public final class COSInteger extends COSNumber
{
/**
* The lowest integer to be kept in the {@link #STATIC} array.
*/
private static final int LOW = -100;
/**
* The highest integer to be kept in the {@link #STATIC} array.
*/
private static final int HIGH = 256;
/**
* Static instances of all COSIntegers in the range from {@link #LOW}
* to {@link #HIGH}.
*/
private static final COSInteger[] STATIC = new COSInteger[HIGH - LOW + 1];
/**
* Constant for the number zero.
* @since Apache PDFBox 1.1.0
*/
public static final COSInteger ZERO = get(0);
/**
* Constant for the number one.
* @since Apache PDFBox 1.1.0
*/
public static final COSInteger ONE = get(1);
/**
* Constant for the number two.
* @since Apache PDFBox 1.1.0
*/
public static final COSInteger TWO = get(2);
/**
* Constant for the number three.
* @since Apache PDFBox 1.1.0
*/
public static final COSInteger THREE = get(3);
/**
* Returns a COSInteger instance with the given value.
*
* @param val integer value
* @return COSInteger instance
*/
public static COSInteger get(long val)
{
if (LOW <= val && val <= HIGH)
{
int index = (int) val - LOW;
// no synchronization needed
if (STATIC[index] == null)
{
STATIC[index] = new COSInteger(val);
}
return STATIC[index];
}
return new COSInteger(val);
}
private final long value;
/**
* constructor.
*
* @param val The integer value of this object.
*/
private COSInteger( long val )
{
value = val;
}
/**
* {@inheritDoc}
*/
@Override
public boolean equals(Object o)
{
return o instanceof COSInteger && ((COSInteger)o).intValue() == intValue();
}
/**
* {@inheritDoc}
*/
@Override
public int hashCode()
{
//taken from java.lang.Long
return (int)(value ^ (value >> 32));
}
/**
* {@inheritDoc}
*/
@Override
public String toString()
{
return "COSInt{" + value + "}";
}
/**
* polymorphic access to value as float.
*
* @return The float value of this object.
*/
@Override
public float floatValue()
{
return value;
}
/**
* polymorphic access to value as float.
*
* @return The double value of this object.
*/
@Override
public double doubleValue()
{
return value;
}
/**
* Polymorphic access to value as int
* This will get the integer value of this object.
*
* @return The int value of this object,
*/
@Override
public int intValue()
{
return (int)value;
}
/**
* Polymorphic access to value as int
* This will get the integer value of this object.
*
* @return The int value of this object,
*/
@Override
public long longValue()
{
return value;
}
/**
* 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.visitFromInt(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(String.valueOf(value).getBytes("ISO-8859-1"));
}
}