tag.java

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/*
 * This is public domain software - that is, you can do whatever you want
 * with it, and include it software that is licensed under the GNU or the
 * BSD license, or whatever other licence you choose, including proprietary
 * closed source licenses.  I do ask that you leave this header in tact.
 *
 * If you make modifications to this code that you think would benefit the
 * wider community, please send me a copy and I'll post it on my site.
 *
 * If you make use of this code, I'd appreciate hearing about it.
 *   [e-mail]
 * Latest version of this software kept at
 *   http://drewnoakes.com/
 *
 * Created by dnoakes on 26-Nov-2002 18:29:12 using IntelliJ IDEA.
 */
package com.drew.metadata;

import java.io.Serializable;

/**
 *
 */
public class Tag implements Serializable
{
    private final int _tagType;
    private final Directory _directory;

    public Tag(int tagType, Directory directory)
    {
        _tagType = tagType;
        _directory = directory;
    }

    /**
     * Gets the tag type as an int
     * @return the tag type as an int
     */
    public int getTagType()
    {
        return _tagType;
    }

    /**
     * Gets the tag type in hex notation as a String with padded leading
     * zeroes if necessary (i.e. <code>0x100E</code>).
     * @return the tag type as a string in hexadecimal notation
     */
    public String getTagTypeHex()
    {
        String hex = Integer.toHexString(_tagType);
        while (hex.length() < 4) hex = "0" + hex;
        return "0x" + hex;
    }

    /**
     * Get a description of the tag's value, considering enumerated values
     * and units.
     * @return a description of the tag's value
     */
    public String getDescription() throws MetadataException
    {
        return _directory.getDescription(_tagType);
    }

    /**
     * Get the name of the tag, such as <code>Aperture</code>, or
     * <code>InteropVersion</code>.
     * @return the tag's name
     */
    public String getTagName()
    {
        return _directory.getTagName(_tagType);
    }

    /**
     * Get the name of the directory in which the tag exists, such as
     * <code>Exif</code>, <code>GPS</code> or <code>Interoperability</code>.
     * @return name of the directory in which this tag exists
     */
    public String getDirectoryName()
    {
        return _directory.getName();
    }

    /**
     * A basic representation of the tag's type and value in format:
     * <code>FNumber - F2.8</code>.
     * @return the tag's type and value
     */
    public String toString()
    {
        String description;
        try {
            description = getDescription();
        } catch (MetadataException e) {
            description = _directory.getString(getTagType()) + " (unable to formulate description)";
        }
        return "[" + _directory.getName() + "] " + getTagName() + " - " + description;
    }
}