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/*
 * @(#)TIFFDirectory.java  1.0  2010-07-25
 * 
 * Copyright (c) 2010 Werner Randelshofer, Goldau, Switzerland.
 * All rights reserved.
 *
 * You may not use, copy or modify this file, except in compliance with the
 * license agreement you entered into with Werner Randelshofer.
 * For details see accompanying license terms.
 */
package org.monte.media.tiff;

import java.util.ArrayList;

/**
 * A convenience class for working with TIFF IFD's.
 *
 * @author Werner Randelshofer
 * @version 1.0 2010-07-25 Created.
 */
public class TIFFDirectory extends TIFFNode {
    /** The tag set of this directory. */
    private TagSet tagSet;
    /** The index of this directory. */
    private int index;


    /** The IFD from which this directory was read.
     * ifd is null, if this directory has not been read from a TIFF file.
     */
    private IFD ifd;
    /** Segments of the TIFF file which hold the IFD.
     * tiffSegments is null, if this directory has not been read from a TIFF file.
     */
    private ArrayList fileSegments;
    /** Offset of the directory in the file segment if ifd is null. */
    private long offset;
    /** Length of the directory in the file segment if ifd is null. */
    private long length;

    /** Creates a TIFFDirectory identified by the specified TIFFTag. */
    public TIFFDirectory(TagSet tagSet, TIFFTag tag, int index) {
        super(tag);
        this.tagSet=tagSet;
        this.index=index;
    }
    /** Creates a TIFFDirectory identified by the specified TIFFTag and associated
     * with the specified IFD and file segments. */
    public TIFFDirectory(TagSet tagSet, TIFFTag tag, int index, IFD ifd, IFDEntry parentEntry, ArrayList fileSegments) {
        this(tagSet, tag, index);
        this.ifd=ifd;
        this.ifdEntry=parentEntry;
        this.fileSegments=fileSegments;
    }
    /** Creates a TIFFDirectory identified by the specified TIFFTag and associated
     * with the specified IFD and file segments. */
    public TIFFDirectory(TagSet tagSet, TIFFTag tag, int index, IFD ifd, IFDEntry parentEntry, FileSegment fileSegment) {
        this(tagSet, tag, index);
        this.ifd=ifd;
        this.ifdEntry=parentEntry;
        this.fileSegments=new ArrayList();
        fileSegments.add(fileSegment);
    }

    public TIFFDirectory(TagSet tagSet, TIFFTag tag, int index, long offset, long length, FileSegment fileSegment) {
        this(tagSet, tag, index);
        this.offset=offset;
        this.length=length;
        this.fileSegments=new ArrayList();
        fileSegments.add(fileSegment);
    }
    public TIFFDirectory(TagSet tagSet, TIFFTag tag, int index, long offset, long length, ArrayList fileSegments) {
        this(tagSet, tag, index);
        this.offset=offset;
        this.length=length;
        this.fileSegments=fileSegments;
    }

    /** Returns the IFD from which this directory has been read.
     *
     * @return IFD or null.
     */
    public IFD getIFD() {
        return ifd;
    }

    /** Returns the tag set used by this directory. */
    public TagSet getTagSet() {
        return tagSet;
    }

    public String getName() {
        return tagSet==null?null: tagSet.getName();
    }

    public int getIndex() {
        return index;
    }
    public int getCount() {
        return getChildren().size();
    }

    public long getOffset() {
        return ifd!=null?ifd.getOffset():offset;
    }
    public long getLength() {
        return ifd!=null?ifd.getLength():length;
    }

    /** Returns the segments of the TIFF file inside its parent file.
     * In a JPEG JFIF stream, a TIFF file can be segmented over multiple
     * APP markers.
     *
     * @return segment list or null.
     */
    public ArrayList getFileSegments() {
        return fileSegments;
    }

    /** Returns a TIFFField with the specified tag. If a child node with
     * this tag exists.
     * @param tag
     */
    public TIFFField getField(TIFFTag tag) {
        for (TIFFNode node:getChildren()) {
            if (node instanceof TIFFField) {
                if (node.getTag()==tag) {
                    return (TIFFField) node;
                }
            }
        }
        return null;
    }
    /** Returns the value of the TIFFField with the specified tag. If a child node with
     * this tag exists.
     * @param tag
     */
    public Object getData(TIFFTag tag) {
        TIFFField field=getField(tag);
        return field==null?null:field.getData();
    }

    @Override
    public String toString() {
        return "TIFFDirectory "+tagSet;
    }

}