com.itextpdf.io.source.RAFRandomAccessSource Maven / Gradle / Ivy
/*
This file is part of the iText (R) project.
Copyright (c) 1998-2022 iText Group NV
Authors: Bruno Lowagie, Paulo Soares, et al.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License version 3
as published by the Free Software Foundation with the addition of the
following permission added to Section 15 as permitted in Section 7(a):
FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
OF THIRD PARTY RIGHTS
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program; if not, see http://www.gnu.org/licenses or write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA, 02110-1301 USA, or download the license from the following URL:
http://itextpdf.com/terms-of-use/
The interactive user interfaces in modified source and object code versions
of this program must display Appropriate Legal Notices, as required under
Section 5 of the GNU Affero General Public License.
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a covered work must retain the producer line in every PDF that is created
or manipulated using iText.
You can be released from the requirements of the license by purchasing
a commercial license. Buying such a license is mandatory as soon as you
develop commercial activities involving the iText software without
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These activities include: offering paid services to customers as an ASP,
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*/
package com.itextpdf.io.source;
import java.io.RandomAccessFile;
/**
* A RandomAccessSource that uses a {@link java.io.RandomAccessFile} as it's source
* Note: Unlike most of the RandomAccessSource implementations, this class is not thread safe
*/
class RAFRandomAccessSource implements IRandomAccessSource {
/**
* The source
*/
private final RandomAccessFile raf;
/**
* The length of the underling RAF. Note that the length is cached at construction time to avoid the possibility
* of {@link java.io.IOException}s when reading the length.
*/
private final long length;
/**
* Creates this object
* @param raf the source for this RandomAccessSource
* @throws java.io.IOException if the RAF can't be read
*/
public RAFRandomAccessSource(RandomAccessFile raf) throws java.io.IOException {
this.raf = raf;
length = raf.length();
}
/**
* {@inheritDoc}
*/
public int get(long position) throws java.io.IOException {
if (position > length)
return -1;
// Not thread safe!
if (raf.getFilePointer() != position) {
raf.seek(position);
}
return raf.read();
}
/**
* {@inheritDoc}
*/
public int get(long position, byte[] bytes, int off, int len) throws java.io.IOException {
if (position > length)
return -1;
// Not thread safe!
if (raf.getFilePointer() != position) {
raf.seek(position);
}
return raf.read(bytes, off, len);
}
/**
* {@inheritDoc}
* Note: the length is determined when the {@link RAFRandomAccessSource} is constructed. If the file length changes
* after construction, that change will not be reflected in this call.
*/
public long length() {
return length;
}
/**
* Closes the underlying RandomAccessFile
*/
public void close() throws java.io.IOException {
raf.close();
}
}