src/main/java/org/apache/commons/imaging/formats/tiff/fieldtypes/FieldTypeRational.java

/*
 * 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.commons.imaging.formats.tiff.fieldtypes;

import org.apache.commons.imaging.ImageWriteException;
import org.apache.commons.imaging.common.RationalNumber;
import org.apache.commons.imaging.common.RationalNumberUtilities;
import org.apache.commons.imaging.formats.tiff.TiffField;
import org.apache.commons.imaging.util.Debug;

public class FieldTypeRational extends FieldType
{
    public FieldTypeRational(int type, String name)
    {
        super(type, 8, name);
    }

    @Override
    public Object getSimpleValue(TiffField entry)
    {
        if (entry.length == 1)
            return convertByteArrayToRational(name + " (" + entry.tagInfo.name
                    + ")", entry.oversizeValue, entry.byteOrder);

        return convertByteArrayToRationalArray(name + " (" + entry.tagInfo.name
                + ")", getRawBytes(entry), 0, entry.length, entry.byteOrder);
    }

    @Override
    public byte[] writeData(Object o, int byteOrder) throws ImageWriteException
    {
        if (o instanceof RationalNumber)
            return convertRationalToByteArray((RationalNumber) o, byteOrder);
        else if (o instanceof RationalNumber[])
        {
            return convertRationalArrayToByteArray((RationalNumber[]) o,
                    byteOrder);
        }
        else if (o instanceof Number)
        {
            Number number = (Number) o;
            RationalNumber rationalNumber = RationalNumberUtilities
                    .getRationalNumber(number.doubleValue());
            return convertRationalToByteArray(rationalNumber, byteOrder);
        }
        else if (o instanceof Number[])
        {
            Number numbers[] = (Number[]) o;
            RationalNumber rationalNumbers[] = new RationalNumber[numbers.length];
            for (int i = 0; i < numbers.length; i++)
            {
                Number number = numbers[i];
                rationalNumbers[i] = RationalNumberUtilities
                        .getRationalNumber(number.doubleValue());
            }
            return convertRationalArrayToByteArray(rationalNumbers, byteOrder);
        }
        else if (o instanceof double[])
        {
            double numbers[] = (double[]) o;
            RationalNumber rationalNumbers[] = new RationalNumber[numbers.length];
            for (int i = 0; i < numbers.length; i++)
            {
                double number = numbers[i];
                rationalNumbers[i] = RationalNumberUtilities
                        .getRationalNumber(number);
            }
            return convertRationalArrayToByteArray(rationalNumbers, byteOrder);
        }
        else
            throw new ImageWriteException("Invalid data: " + o + " ("
                    + Debug.getType(o) + ")");
    }

    public byte[] writeData(int numerator, int denominator, int byteOrder)
            throws ImageWriteException
    {
        return writeData(new int[]{
            numerator
        }, new int[]{
            denominator
        }, byteOrder);
    }

    public byte[] writeData(int numerators[], int denominators[], int byteOrder)
            throws ImageWriteException
    {
        return convertIntArrayToRationalArray(numerators, denominators,
                byteOrder);
    }
}