org.monte.media.tiff.IFD Maven / Gradle / Ivy
/*
* @(#)IFD.java 2.0 2010-07-24
*
* Copyright (c) 2009 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;
import java.util.Collections;
import java.util.List;
/**
* Represents a TIFF Image File Directory (IFD).
*
* An IFD consists of a 2-byte count of the number of directory entries
* (i.e., the number of fields), followed by a sequence of 12-byte field entries,
* followed by a 4-byte offset of the next IFD (or 0 if none).
*
* There must be at least 1 IFD in a TIFF file and each IFD must have at least
* one entry.
*
* @author Werner Randelshofer
* @version 2.0 2010-07-24 Reworked.
*
1.0 2009-12-26 Created.
*/
public class IFD {
/** The offset of this IFD inside of the TIFF input stream when it was
* read from the input stream. */
private long offset;
/** Whether this IFD has a nextOffset field. */
private boolean hasNextOffset;
/** The offset of the next IFD.
* 0 if there are no more IFD's.
*/
private long nextOffset;
/** The entries of this IFD. */
private ArrayList entries;
public IFD(long offset, boolean hasNextOffset) {
this.offset = offset;
this.hasNextOffset=hasNextOffset;
this.entries = new ArrayList();
}
/** Returns the offset of the IFD. */
public long getOffset() {
return offset;
}
/** Sets the offset of the next IFD. */
/*package*/ void setNextOffset(long nextOffset) {
this.nextOffset = nextOffset;
}
/** Gets the offset of the next IFD.
* Returns 0 if there is no next IFD.
*
*/
public long getNextOffset() {
return (hasNextOffset)?this.nextOffset:0;
}
public boolean hasNextOffset() {
return hasNextOffset;
}
/** Returns the number of entries in the IFD. */
public int getCount() {
return entries.size();
}
/** Returns the {@code IFDEntry} at the specified index. */
public IFDEntry get(int index) {
return null;
}
/** Adds an {@code IFDEntry}. */
/* package */ void add(IFDEntry entry) {
entries.add(entry);
}
/** Returns an unmodifiale list of the {@code IFDEntry}s. */
public List getEntries() {
return Collections.unmodifiableList(entries);
}
@Override
public String toString() {
StringBuilder buf = new StringBuilder();
buf.append("IFD offset:");
buf.append(offset);
buf.append(", numEntries:");
buf.append(entries.size());
buf.append(", next:");
buf.append(nextOffset);
for (IFDEntry e : entries) {
buf.append("\n ");
buf.append(e);
}
return buf.toString();
}
/** Returns the length of this IFD in bytes. */
public long getLength() {
return getCount()*12+(hasNextOffset?4:0);
}
}