Java DataOutput類代碼示例

import java.io.DataOutput; //導入依賴的package包/類
/**
 * Write the actual data contents of the tag, implemented in NBT extension classes
 */
void write(DataOutput output) throws IOException
{
    if (!this.tagList.isEmpty())
    {
        this.tagType = ((NBTBase)this.tagList.get(0)).getId();
    }
    else
    {
        this.tagType = 0;
    }

    output.writeByte(this.tagType);
    output.writeInt(this.tagList.size());

    for (int i = 0; i < this.tagList.size(); ++i)
    {
        ((NBTBase)this.tagList.get(i)).write(output);
    }
}
 

import java.io.DataOutput; //導入依賴的package包/類
/**
 * FileSystemGroup ::= #scheme (scheme #counter (key value)*)*
 */
@Override
public void write(DataOutput out) throws IOException {
  WritableUtils.writeVInt(out, map.size()); // #scheme
  for (Map.Entry<String, Object[]> entry : map.entrySet()) {
    WritableUtils.writeString(out, entry.getKey()); // scheme
    // #counter for the above scheme
    WritableUtils.writeVInt(out, numSetCounters(entry.getValue()));
    for (Object counter : entry.getValue()) {
      if (counter == null) continue;
      @SuppressWarnings("unchecked")
      FSCounter c = (FSCounter) ((Counter)counter).getUnderlyingCounter();
      WritableUtils.writeVInt(out, c.key.ordinal());  // key
      WritableUtils.writeVLong(out, c.getValue());    // value
    }
  }
}
 

import java.io.DataOutput; //導入依賴的package包/類
@Override
public void write(DataOutput out) throws IOException {
  super.write(out);
  WritableUtils.writeVInt(out, id);
  WritableUtils.writeVInt(out, maps);
  WritableUtils.writeVLong(out, inputRecords);
  WritableUtils.writeVLong(out, outputBytes);
  WritableUtils.writeVLong(out, outputRecords);
  WritableUtils.writeVLong(out, maxMemory);
  WritableUtils.writeVInt(out, reduces);
  for (int i = 0; i < reduces; ++i) {
    out.writeDouble(reduceBytes[i]);
    out.writeDouble(reduceRecords[i]);
  }
  WritableUtils.writeVInt(out, nSpec);
  for (int i = 0; i < nSpec; ++i) {
    WritableUtils.writeVLong(out, reduceOutputBytes[i]);
    WritableUtils.writeVLong(out, reduceOutputRecords[i]);
  }
}
 

import java.io.DataOutput; //導入依賴的package包/類
private static void produceRelativePath(String path, Object out) throws IOException {
    if (path.isEmpty()) {
        if (out instanceof DataOutput) {
            DataOutput dos = (DataOutput)out;
            dos.writeUTF(path);
        }
        return;
    }
    if (testWritePath(path, System.getProperty("netbeans.user"), "user", out)) { // NOI18N
        return;
    }
    int cnt = 0;
    for (String p : Clusters.dirs()) {
        if (testWritePath(path, p, "" + cnt, out)) {
            return;
        }
        cnt++;
    }
    if (testWritePath(path, System.getProperty("netbeans.home"), "home", out)) { // NOI18N
        return;
    }
    LOG.log(Level.FINE, "Cannot find relative path for {0}", path); // NOI18N
    doWritePath("abs", path, out); // NOI18N
}
 

import java.io.DataOutput; //導入依賴的package包/類
/**
 * Writes an array of <code>String</code>s to a <code>DataOutput</code>. This method will
 * serialize a <code>null</code> array and not throw a <code>NullPointerException</code>.
 *
 * @throws IOException A problem occurs while writing to <code>out</code>
 *
 * @see #readStringArray
 * @see #writeString
 */
public static void writeStringArray(String[] array, DataOutput out) throws IOException {

  InternalDataSerializer.checkOut(out);

  int length;
  if (array == null) {
    length = -1;
  } else {
    length = array.length;
  }
  InternalDataSerializer.writeArrayLength(length, out);
  if (logger.isTraceEnabled(LogMarker.SERIALIZER)) {
    logger.trace(LogMarker.SERIALIZER, "Writing String array of length {}", length);
  }
  if (length > 0) {
    for (int i = 0; i < length; i++) {
      writeString(array[i], out);
    }
  }
}
 

import java.io.DataOutput; //導入依賴的package包/類
private int readWrite(ProgressWindow progress, DataOutput out, int size, byte[] buffer) {
    if (size == 0)
        return 0;
    try {
        in.readFully(buffer, 0, size);
        if (size != BUFFERSIZE)
            progress.setText("Finishing up the transfer..");
        out.write(buffer, 0, size);
    } catch (Exception ex) {
        progress.setText("Transmission error!");
        System.out.println("Transmission error");
        return -1;
    }

    bytesSent += size;
    progress.setText("Transfered: " + Util.getStringFromBytes(bytesSent),
            FileProgressWindow.BAR_1);
    progress.setValue(bytesSent + amountToSkip, FileProgressWindow.BAR_1);
    return size;
}
 

import java.io.DataOutput; //導入依賴的package包/類
private int writeStrings(DataOutput payload, ByteBuffer offsets, boolean shrink) throws IOException {
    int stringOffset = 0;
    Map<String, Integer> used = new HashMap<>();  // Keeps track of strings already written
    for (String string : strings) {
        // Dedupe everything except stylized strings, unless shrink is true (then dedupe everything)
        if (used.containsKey(string) && (shrink || isOriginalDeduped)) {
            Integer offset = used.get(string);
            offsets.putInt(offset == null ? 0 : offset);
        } else {
            byte[] encodedString = ResourceString.encodeString(string, getStringType());
            payload.write(encodedString);
            used.put(string, stringOffset);
            offsets.putInt(stringOffset);
            stringOffset += encodedString.length;
        }
    }

    // ARSC files pad to a 4-byte boundary. We should do so too.
    stringOffset = writePad(payload, stringOffset);
    return stringOffset;
}
 

import java.io.DataOutput; //導入依賴的package包/類
/**
 * Save SnapshotDiff list for an INodeDirectoryWithSnapshot.
 * @param sNode The directory that the SnapshotDiff list belongs to.
 * @param out The {@link DataOutput} to write.
 */
private static <N extends INode, A extends INodeAttributes, D extends AbstractINodeDiff<N, A, D>>
    void saveINodeDiffs(final AbstractINodeDiffList<N, A, D> diffs,
    final DataOutput out, ReferenceMap referenceMap) throws IOException {
  // Record the diffs in reversed order, so that we can find the correct
  // reference for INodes in the created list when loading the FSImage
  if (diffs == null) {
    out.writeInt(-1); // no diffs
  } else {
    final List<D> list = diffs.asList();
    final int size = list.size();
    out.writeInt(size);
    for (int i = size - 1; i >= 0; i--) {
      list.get(i).write(out, referenceMap);
    }
  }
}
 

import java.io.DataOutput; //導入依賴的package包/類
/**
 * test BlackListInfo class
 * 
 * @throws IOException
 */
@Test (timeout=5000)
public void testBlackListInfo() throws IOException {
  BlackListInfo info = new BlackListInfo();
  info.setBlackListReport("blackListInfo");
  info.setReasonForBlackListing("reasonForBlackListing");
  info.setTrackerName("trackerName");
  ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
  DataOutput out = new DataOutputStream(byteOut);
  info.write(out);
  BlackListInfo info2 = new BlackListInfo();
  info2.readFields(new DataInputStream(new ByteArrayInputStream(byteOut
      .toByteArray())));
  assertEquals(info, info);
  assertEquals(info.toString(), info.toString());
  assertEquals(info.getTrackerName(), "trackerName");
  assertEquals(info.getReasonForBlackListing(), "reasonForBlackListing");
  assertEquals(info.getBlackListReport(), "blackListInfo");

}
 

import java.io.DataOutput; //導入依賴的package包/類
@Override
public void write(DataOutput out) throws IOException {
  super.write(out);
  
  // Write out the number of entries in the map
  
  out.writeInt(instance.size());
  
  // Then write out each key/value pair
  
  for (Map.Entry<WritableComparable, Writable> e: instance.entrySet()) {
    out.writeByte(getId(e.getKey().getClass()));
    e.getKey().write(out);
    out.writeByte(getId(e.getValue().getClass()));
    e.getValue().write(out);
  }
}
 

import java.io.DataOutput; //導入依賴的package包/類
@Override
public void toData(DataOutput out) throws IOException {
  out.writeBoolean(isRequestForEntireConfiguration);
  int size = groups.size();
  out.writeInt(size);
  if (size > 0) {
    for (String group : groups) {
      out.writeUTF(group);
    }
  }
  out.writeInt(numAttempts);
}
 

import java.io.DataOutput; //導入依賴的package包/類
/**
 * Construct an instance of the NBT factory by deducing the class of NBTBase.
 */
private NbtFactory() {
    if (BASE_CLASS == null) {
        try {
            // Keep in mind that I do use hard-coded field names - but it's okay as long as we're dealing
            // with CraftBukkit or its derivatives. This does not work in MCPC+ however.
            ClassLoader loader = NbtFactory.class.getClassLoader();

            String packageName = getPackageName();
            Class<?> offlinePlayer = loader.loadClass(packageName + ".CraftOfflinePlayer");

            // Prepare NBT
            COMPOUND_CLASS = getMethod(0, Modifier.STATIC, offlinePlayer, "getData").getReturnType();
            BASE_CLASS = COMPOUND_CLASS.getSuperclass();
            NBT_GET_TYPE = getMethod(0, Modifier.STATIC, BASE_CLASS, "getTypeId");
            NBT_CREATE_TAG = getMethod(Modifier.STATIC, 0, BASE_CLASS, "createTag", byte.class);

            // Prepare CraftItemStack
            CRAFT_STACK = loader.loadClass(packageName + ".inventory.CraftItemStack");
            CRAFT_HANDLE = getField(null, CRAFT_STACK, "handle");
            STACK_TAG = getField(null, CRAFT_HANDLE.getType(), "tag");

            // Loading/saving
            String nmsPackage = BASE_CLASS.getPackage().getName();
            initializeNMS(loader, nmsPackage);

            LOAD_COMPOUND = READ_LIMITER_CLASS != null ?
                    new LoadMethodSkinUpdate(STREAM_TOOLS, READ_LIMITER_CLASS) :
                    new LoadMethodWorldUpdate(STREAM_TOOLS);
            SAVE_COMPOUND = getMethod(Modifier.STATIC, 0, STREAM_TOOLS, null, BASE_CLASS, DataOutput.class);

        } catch (ClassNotFoundException e) {
            throw new IllegalStateException("Unable to find offline player.", e);
        }
    }
}
 

import java.io.DataOutput; //導入依賴的package包/類
@Override
protected void writePayload(DataOutput output, ByteBuffer header, boolean shrink)
    throws IOException {
  ByteArrayOutputStream baos = new ByteArrayOutputStream();
  ByteBuffer offsets = ByteBuffer.allocate(getOffsetSize()).order(ByteOrder.LITTLE_ENDIAN);
  try (LittleEndianDataOutputStream payload = new LittleEndianDataOutputStream(baos)) {
    writeEntries(payload, offsets, shrink);
  }
  output.write(offsets.array());
  output.write(baos.toByteArray());
}
 

import java.io.DataOutput; //導入依賴的package包/類
/**
 * Writes just the bloom filter to the output array
 * @param out OutputStream to place bloom
 * @throws IOException Error writing bloom array
 */
public void writeBloom(final DataOutput out) throws IOException {
  if (!this.bloom.hasArray()) {
    throw new IOException("Only writes ByteBuffer with underlying array.");
  }
  out.write(bloom.array(), bloom.arrayOffset(), bloom.limit());
}
 

import java.io.DataOutput; //導入依賴的package包/類
@Override
public void toData(DataOutput out) throws IOException {
  super.toData(out);
  DataSerializer.writeObject(this.eventID, out);
  DataSerializer.writePrimitiveInt(this.serialNum, out);
  DataSerializer.writePrimitiveBoolean(this.notifyOfRegionDeparture, out);
  DataSerializer.writeHashMap(this.subregionSerialNumbers, out);
}