org.apache.pdfbox.cos.COSInteger Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of pdfbox Show documentation
The Apache PDFBox library is an open source Java tool for working with PDF documents.
There is a newer version: 3.0.2
/*
 * 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;

/**
 * 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"));
    }

}