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Apache Commons Imaging (previously Sanselan) is a pure-Java image library.
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/*
 * 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 java.nio.ByteOrder;

import org.apache.commons.imaging.ImageWriteException;
import org.apache.commons.imaging.common.ByteConversions;
import org.apache.commons.imaging.common.RationalNumber;
import org.apache.commons.imaging.formats.tiff.TiffField;

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

    @Override
    public Object getValue(final TiffField entry) {
        final byte[] bytes = entry.getByteArrayValue();
        boolean unsignedType = entry.getFieldType() != SRATIONAL;
        if (entry.getCount() == 1) {
            return ByteConversions.toRational(
                    bytes,
                    entry.getByteOrder(),
                    unsignedType);
        }
        return ByteConversions.toRationals(bytes, entry.getByteOrder(), unsignedType);
    }

    @Override
    public byte[] writeData(final Object o, final ByteOrder byteOrder) throws ImageWriteException {
        if (o instanceof RationalNumber) {
            return ByteConversions.toBytes((RationalNumber) o, byteOrder);
        }
        if (o instanceof RationalNumber[]) {
            return ByteConversions.toBytes((RationalNumber[]) o, byteOrder);
        }
        if (o instanceof Number) {
            final Number number = (Number) o;
            final RationalNumber rationalNumber = RationalNumber.valueOf(number.doubleValue());
            return ByteConversions.toBytes(rationalNumber, byteOrder);
        }
        if (o instanceof Number[]) {
            final Number[] numbers = (Number[]) o;
            final RationalNumber[] rationalNumbers = new RationalNumber[numbers.length];
            for (int i = 0; i < numbers.length; i++) {
                final Number number = numbers[i];
                rationalNumbers[i] = RationalNumber.valueOf(number.doubleValue());
            }
            return ByteConversions.toBytes(rationalNumbers, byteOrder);
        }
        if (!(o instanceof double[])) {
            throw new ImageWriteException("Invalid data", o);
        }
        final double[] numbers = (double[]) o;
        final RationalNumber[] rationalNumbers = new RationalNumber[numbers.length];
        for (int i = 0; i < numbers.length; i++) {
            final double number = numbers[i];
            rationalNumbers[i] = RationalNumber.valueOf(number);
        }
        return ByteConversions.toBytes(rationalNumbers, byteOrder);
    }
}