    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *      http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 * Unless required by applicable law or agreed to in writing, software
    012 * distributed under the License is distributed on an "AS IS" BASIS,
    013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 * See the License for the specific language governing permissions and
    015 * limitations under the License.
    016 */
    017package org.apache.commons.imaging.formats.tiff.fieldtypes;
    018
    019import java.nio.ByteOrder;
    020
    021import org.apache.commons.imaging.ImageWriteException;
    022import org.apache.commons.imaging.common.ByteConversions;
    023import org.apache.commons.imaging.common.RationalNumber;
    024import org.apache.commons.imaging.formats.tiff.TiffField;
    025
    026public class FieldTypeRational extends FieldType {
    027    public FieldTypeRational(final int type, final String name) {
    028        super(type, name, 8);
    029    }
    030
    031    @Override
    032    public Object getValue(final TiffField entry) {
    033        final byte[] bytes = entry.getByteArrayValue();
    034        boolean unsignedType = entry.getFieldType() != SRATIONAL;
    035        if (entry.getCount() == 1) {
    036            return ByteConversions.toRational(
    037                    bytes,
    038                    entry.getByteOrder(),
    039                    unsignedType);
    040        }
    041        return ByteConversions.toRationals(bytes, entry.getByteOrder(), unsignedType);
    042    }
    043
    044    @Override
    045    public byte[] writeData(final Object o, final ByteOrder byteOrder) throws ImageWriteException {
    046        if (o instanceof RationalNumber) {
    047            return ByteConversions.toBytes((RationalNumber) o, byteOrder);
    048        }
    049        if (o instanceof RationalNumber[]) {
    050            return ByteConversions.toBytes((RationalNumber[]) o, byteOrder);
    051        }
    052        if (o instanceof Number) {
    053            final Number number = (Number) o;
    054            final RationalNumber rationalNumber = RationalNumber.valueOf(number.doubleValue());
    055            return ByteConversions.toBytes(rationalNumber, byteOrder);
    056        }
    057        if (o instanceof Number[]) {
    058            final Number[] numbers = (Number[]) o;
    059            final RationalNumber[] rationalNumbers = new RationalNumber[numbers.length];
    060            for (int i = 0; i < numbers.length; i++) {
    061                final Number number = numbers[i];
    062                rationalNumbers[i] = RationalNumber.valueOf(number.doubleValue());
    063            }
    064            return ByteConversions.toBytes(rationalNumbers, byteOrder);
    065        }
    066        if (!(o instanceof double[])) {
    067            throw new ImageWriteException("Invalid data", o);
    068        }
    069        final double[] numbers = (double[]) o;
    070        final RationalNumber[] rationalNumbers = new RationalNumber[numbers.length];
    071        for (int i = 0; i < numbers.length; i++) {
    072            final double number = numbers[i];
    073            rationalNumbers[i] = RationalNumber.valueOf(number);
    074        }
    075        return ByteConversions.toBytes(rationalNumbers, byteOrder);
    076    }
    077}