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SciJava Common is a shared library for SciJava software. It provides a plugin framework, with an extensible mechanism for service discovery, backed by its own annotation processor, so that plugins can be loaded dynamically. It is used by downstream projects in the SciJava ecosystem, such as ImageJ and SCIFIO.
/*
* #%L
* SciJava Common shared library for SciJava software.
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* Wisconsin-Madison, Broad Institute of MIT and Harvard, Max Planck
* Institute of Molecular Cell Biology and Genetics, University of
* Konstanz, and KNIME GmbH.
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
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package org.scijava.io.handle;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.util.Date;
import org.scijava.io.location.FileLocation;
import org.scijava.plugin.Plugin;
/**
* {@link DataHandle} for a {@link FileLocation}.
*
* @author Curtis Rueden
*/
@Plugin(type = DataHandle.class)
public class FileHandle extends AbstractDataHandle {
// -- Fields --
/** The {@link RandomAccessFile} backing this file handle. */
private RandomAccessFile raf;
/** The mode of the {@link RandomAccessFile}. */
private String mode = "rw";
/** True iff the {@link #close()} has already been called. */
private boolean closed;
// -- FileHandle methods --
/** Gets the random access file object backing this FileHandle. */
public RandomAccessFile getRandomAccessFile() throws IOException {
return raf();
}
public String getMode() {
return mode;
}
public void setMode(final String mode) {
if (raf != null) {
throw new IllegalStateException("File already initialized");
}
this.mode = mode;
}
// -- DataHandle methods --
@Override
public boolean isReadable() {
return getMode().contains("r");
}
@Override
public boolean isWritable() {
return getMode().contains("w");
}
@Override
public boolean exists() {
return get().getFile().exists();
}
@Override
public Date lastModified() {
final long lastModified = get().getFile().lastModified();
return lastModified == 0 ? null : new Date(lastModified);
}
@Override
public long offset() throws IOException {
return raf().getFilePointer();
}
@Override
public long length() throws IOException {
return exists() ? raf().length() : -1;
}
@Override
public void setLength(final long length) throws IOException {
raf().setLength(length);
}
@Override
public int read() throws IOException {
return raf().read();
}
@Override
public int read(final byte[] b) throws IOException {
return raf().read(b);
}
@Override
public int read(final byte[] b, final int off, final int len)
throws IOException
{
return raf().read(b, off, len);
}
@Override
public void seek(final long pos) throws IOException {
raf().seek(pos);
}
// -- DataInput methods --
@Override
public boolean readBoolean() throws IOException {
return raf().readBoolean();
}
@Override
public byte readByte() throws IOException {
return raf().readByte();
}
@Override
public char readChar() throws IOException {
return raf().readChar();
}
@Override
public double readDouble() throws IOException {
return raf().readDouble();
}
@Override
public float readFloat() throws IOException {
return raf().readFloat();
}
@Override
public void readFully(final byte[] b) throws IOException {
raf().readFully(b);
}
@Override
public void readFully(final byte[] b, final int off, final int len)
throws IOException
{
raf().readFully(b, off, len);
}
@Override
public int readInt() throws IOException {
return raf().readInt();
}
@Override
public String readLine() throws IOException {
return raf().readLine();
}
@Override
public long readLong() throws IOException {
return raf().readLong();
}
@Override
public short readShort() throws IOException {
return raf().readShort();
}
@Override
public int readUnsignedByte() throws IOException {
return raf().readUnsignedByte();
}
@Override
public int readUnsignedShort() throws IOException {
return raf().readUnsignedShort();
}
@Override
public String readUTF() throws IOException {
return raf().readUTF();
}
@Override
public int skipBytes(final int n) throws IOException {
return raf().skipBytes(n);
}
// -- DataOutput methods --
@Override
public void write(final byte[] b) throws IOException {
raf().write(b);
}
@Override
public void write(final byte[] b, final int off, final int len)
throws IOException
{
raf().write(b, off, len);
}
@Override
public void write(final int b) throws IOException {
raf().write(b);
}
@Override
public void writeBoolean(final boolean v) throws IOException {
raf().writeBoolean(v);
}
@Override
public void writeByte(final int v) throws IOException {
raf().writeByte(v);
}
@Override
public void writeBytes(final String s) throws IOException {
raf().writeBytes(s);
}
@Override
public void writeChar(final int v) throws IOException {
raf().writeChar(v);
}
@Override
public void writeChars(final String s) throws IOException {
raf().writeChars(s);
}
@Override
public void writeDouble(final double v) throws IOException {
raf().writeDouble(v);
}
@Override
public void writeFloat(final float v) throws IOException {
raf().writeFloat(v);
}
@Override
public void writeInt(final int v) throws IOException {
raf().writeInt(v);
}
@Override
public void writeLong(final long v) throws IOException {
raf().writeLong(v);
}
@Override
public void writeShort(final int v) throws IOException {
raf().writeShort(v);
}
@Override
public void writeUTF(final String str) throws IOException {
raf().writeUTF(str);
}
// -- Closeable methods --
@Override
public synchronized void close() throws IOException {
if (raf != null) raf().close();
closed = true;
}
// -- Typed methods --
@Override
public Class getType() {
return FileLocation.class;
}
// -- Helper methods --
private RandomAccessFile raf() throws IOException {
if (raf == null) initRAF();
return raf;
}
private synchronized void initRAF() throws IOException {
if (closed) throw new IOException("Handle already closed");
if (raf != null) return;
raf = new RandomAccessFile(get().getFile(), getMode());
}
}