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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 java.util.Arrays;
import java.util.Collections;
import java.util.List;

import org.apache.commons.imaging.ImageReadException;
import org.apache.commons.imaging.ImageWriteException;
import org.apache.commons.imaging.formats.tiff.TiffField;

/**
 * TIFF field types.
 */
public abstract class FieldType {
    public static final FieldTypeByte BYTE = new FieldTypeByte(1, "Byte");
    public static final FieldTypeAscii ASCII = new FieldTypeAscii(2, "ASCII");
    public static final FieldTypeShort SHORT = new FieldTypeShort(3, "Short");
    public static final FieldTypeLong LONG = new FieldTypeLong(4, "Long");
    public static final FieldTypeRational RATIONAL = new FieldTypeRational(5, "Rational");
    public static final FieldTypeByte SBYTE = new FieldTypeByte(6, "SByte");
    public static final FieldTypeByte UNDEFINED = new FieldTypeByte(7, "Undefined");
    public static final FieldTypeShort SSHORT = new FieldTypeShort(8, "SShort");
    public static final FieldTypeLong SLONG = new FieldTypeLong(9, "SLong");
    public static final FieldTypeRational SRATIONAL = new FieldTypeRational(10, "SRational");
    public static final FieldTypeFloat FLOAT = new FieldTypeFloat(11, "Float");
    public static final FieldTypeDouble DOUBLE = new FieldTypeDouble(12, "Double");
    public static final FieldTypeLong IFD = new FieldTypeLong(13, "IFD");

    private final int type;
    private final String name;
    private final int elementSize;

    public static final List ANY =
            Collections.unmodifiableList(Arrays.asList(
                    BYTE, ASCII, SHORT,
                    LONG, RATIONAL, SBYTE,
                    UNDEFINED, SSHORT, SLONG,
                    SRATIONAL, FLOAT, DOUBLE,
                    IFD));

    public static final List SHORT_OR_LONG =
            Collections.unmodifiableList(Arrays.asList(
                    SHORT, LONG));

    public static final List SHORT_OR_RATIONAL =
            Collections.unmodifiableList(Arrays.asList(
                    SHORT, RATIONAL));

    public static final List SHORT_OR_LONG_OR_RATIONAL =
            Collections.unmodifiableList(Arrays.asList(
                    SHORT, LONG, RATIONAL));

    public static final List LONG_OR_SHORT =
            Collections.unmodifiableList(Arrays.asList(
                    SHORT, LONG));

    public static final List BYTE_OR_SHORT =
            Collections.unmodifiableList(Arrays.asList(
                    SHORT, BYTE));

    public static final List LONG_OR_IFD =
            Collections.unmodifiableList(Arrays.asList(
                    (FieldType) LONG, IFD));

    public static final List ASCII_OR_RATIONAL =
            Collections.unmodifiableList(Arrays.asList(
                    ASCII, RATIONAL));

    public static final List ASCII_OR_BYTE =
            Collections.unmodifiableList(Arrays.asList(
                    ASCII, BYTE));

    protected FieldType(final int type, final String name, final int elementSize) {
        this.type = type;
        this.name = name;
        this.elementSize = elementSize;
    }


    public int getType() {
        return type;
    }

    public String getName() {
        return name;
    }

    public int getSize() {
        return elementSize;
    }

    public static FieldType getFieldType(final int type) throws ImageReadException {
        for (final FieldType fieldType : ANY) {
            if (fieldType.getType() == type) {
                return fieldType;
            }
        }
        throw new ImageReadException("Field type " + type + " is unsupported");
    }

    public abstract Object getValue(TiffField entry);
    public abstract byte[] writeData(Object o, ByteOrder byteOrder) throws ImageWriteException;
}