org.argeo.jcr/src/org/argeo/jcr/fs/BinaryChannel.java

   1 package org.argeo.jcr.fs;
   2
   3 import java.io.ByteArrayInputStream;
   4 import java.io.IOException;
   5 import java.io.InputStream;
   6 import java.nio.ByteBuffer;
   7 import java.nio.channels.Channels;
   8 import java.nio.channels.FileChannel;
   9 import java.nio.channels.ReadableByteChannel;
  10 import java.nio.channels.SeekableByteChannel;
  11 import java.nio.file.Files;
  12 import java.nio.file.Path;
  13 import java.nio.file.StandardOpenOption;
  14
  15 import javax.jcr.Binary;
  16 import javax.jcr.Node;
  17 import javax.jcr.Property;
  18 import javax.jcr.RepositoryException;
  19 import javax.jcr.Session;
  20 import javax.jcr.nodetype.NodeType;
  21
  22 import org.argeo.jcr.JcrUtils;
  23
  24 public class BinaryChannel implements SeekableByteChannel {
  25         private final Node file;
  26         private Binary binary;
  27         private boolean open = true;
  28
  29         private long position = 0;
  30
  31         // private ByteBuffer toWrite;
  32         private FileChannel fc = null;
  33
  34         public BinaryChannel(Node file) throws RepositoryException, IOException {
  35                 this.file = file;
  36                 // int capacity = 1024 * 1024;
  37                 // this.toWrite = ByteBuffer.allocate(capacity);
  38                 if (file.isNodeType(NodeType.NT_FILE)) {
  39                         if (file.hasNode(Property.JCR_CONTENT)) {
  40                                 Node data = file.getNode(Property.JCR_CONTENT);
  41                                 this.binary = data.getProperty(Property.JCR_DATA).getBinary();
  42                         } else {
  43                                 Node data = file.addNode(Property.JCR_CONTENT, NodeType.NT_RESOURCE);
  44                                 try (InputStream in = new ByteArrayInputStream(new byte[0])) {
  45                                         this.binary = data.getSession().getValueFactory().createBinary(in);
  46                                 }
  47                                 data.setProperty(Property.JCR_DATA, this.binary);
  48                                 data.getSession().save();
  49                         }
  50                 } else {
  51                         throw new IllegalArgumentException(
  52                                         "Unsupported file node " + file + " (" + file.getPrimaryNodeType() + ")");
  53                 }
  54         }
  55
  56         @Override
  57         public synchronized boolean isOpen() {
  58                 return open;
  59         }
  60
  61         @Override
  62         public synchronized void close() throws IOException {
  63                 if (isModified()) {
  64                         Binary newBinary = null;
  65                         try {
  66                                 Session session = file.getSession();
  67                                 // byte[] arr = new byte[(int) position];
  68                                 // toWrite.flip();
  69                                 // toWrite.get(arr);
  70                                 fc.position(0);
  71                                 InputStream in = Channels.newInputStream(fc);
  72                                 newBinary = session.getValueFactory().createBinary(in);
  73                                 file.getNode(Property.JCR_CONTENT).setProperty(Property.JCR_DATA, newBinary);
  74                                 session.save();
  75                                 open = false;
  76                         } catch (RepositoryException e) {
  77                                 throw new IOException("Cannot close " + file, e);
  78                         } finally {
  79                                 JcrUtils.closeQuietly(newBinary);
  80                                 // IOUtils.closeQuietly(fc);
  81                                 if (fc != null) {
  82                                         fc.close();
  83                                 }
  84                         }
  85                 } else {
  86                         clearReadState();
  87                         open = false;
  88                 }
  89         }
  90
  91         @Override
  92         public int read(ByteBuffer dst) throws IOException {
  93                 if (isModified()) {
  94                         return fc.read(dst);
  95                 } else {
  96
  97                         try {
  98                                 int read;
  99                                 // int capacity = dst.capacity();
 100                                 byte[] arr = dst.array();
 101                                 read = binary.read(arr, position);
 102                                 // dst.put(arr, 0, read);
 103
 104                                 // try {
 105                                 // byte[] arr = dst.array();
 106                                 // read = binary.read(arr, position);
 107                                 // } catch (UnsupportedOperationException e) {
 108                                 // int capacity = dst.capacity();
 109                                 // byte[] arr = new byte[capacity];
 110                                 // read = binary.read(arr, position);
 111                                 // dst.put(arr);
 112                                 // }
 113                                 if (read != -1)
 114                                         position = position + read;
 115                                 return read;
 116                         } catch (RepositoryException e) {
 117                                 throw new IOException("Cannot read into buffer", e);
 118                         }
 119                 }
 120         }
 121
 122         @Override
 123         public int write(ByteBuffer src) throws IOException {
 124                 int written = getFileChannel().write(src);
 125                 return written;
 126                 // int byteCount = src.remaining();
 127                 // if (toWrite.remaining() < byteCount)
 128                 // throw new JcrFsException("Write buffer is full");
 129                 // toWrite.put(src);
 130                 // if (position < binarySize)
 131                 // position = binarySize + byteCount;
 132                 // else
 133                 // position = position + byteCount;
 134                 // return byteCount;
 135         }
 136
 137         @Override
 138         public long position() throws IOException {
 139                 if (isModified())
 140                         return getFileChannel().position();
 141                 else
 142                         return position;
 143         }
 144
 145         @Override
 146         public SeekableByteChannel position(long newPosition) throws IOException {
 147                 if (isModified()) {
 148                         getFileChannel().position(position);
 149                 } else {
 150                         this.position = newPosition;
 151                 }
 152                 return this;
 153         }
 154
 155         @Override
 156         public long size() throws IOException {
 157                 if (isModified()) {
 158                         return getFileChannel().size();
 159                 } else {
 160                         try {
 161                                 return binary.getSize();
 162                         } catch (RepositoryException e) {
 163                                 throw new IOException("Cannot get size", e);
 164                         }
 165                 }
 166         }
 167
 168         @Override
 169         public SeekableByteChannel truncate(long size) throws IOException {
 170                 getFileChannel().truncate(size);
 171                 // if (size != size())
 172                 // throw new UnsupportedOperationException("Cannot truncate JCR
 173                 // binary");
 174                 return this;
 175         }
 176
 177         private FileChannel getFileChannel() throws IOException {
 178                 try {
 179                         if (fc == null) {
 180                                 Path tempPath = Files.createTempFile(getClass().getSimpleName(), null);
 181                                 fc = FileChannel.open(tempPath, StandardOpenOption.WRITE, StandardOpenOption.READ,
 182                                                 StandardOpenOption.DELETE_ON_CLOSE, StandardOpenOption.SPARSE);
 183                                 ReadableByteChannel readChannel = Channels.newChannel(binary.getStream());
 184                                 fc.transferFrom(readChannel, 0, binary.getSize());
 185                                 clearReadState();
 186                         }
 187                         return fc;
 188                 } catch (RepositoryException e) {
 189                         throw new IOException("Cannot get temp file channel", e);
 190                 }
 191         }
 192
 193         private boolean isModified() {
 194                 return fc != null;
 195         }
 196
 197         private void clearReadState() {
 198                 position = -1;
 199                 JcrUtils.closeQuietly(binary);
 200                 binary = null;
 201         }
 202 }