public void testStreamInput() throws IOException {
int length = randomIntBetween(10, scaledRandomIntBetween(PAGE_SIZE * 2, PAGE_SIZE * 20));
BytesReference pbr = newBytesReference(length);
StreamInput si = pbr.streamInput();
assertNotNull(si);
// read single bytes one by one
assertEquals(pbr.get(0), si.readByte());
assertEquals(pbr.get(1), si.readByte());
assertEquals(pbr.get(2), si.readByte());
// reset the stream for bulk reading
si.reset();
// buffer for bulk reads
byte[] origBuf = new byte[length];
random().nextBytes(origBuf);
byte[] targetBuf = Arrays.copyOf(origBuf, origBuf.length);
// bulk-read 0 bytes: must not modify buffer
si.readBytes(targetBuf, 0, 0);
assertEquals(origBuf[0], targetBuf[0]);
si.reset();
// read a few few bytes as ints
int bytesToRead = randomIntBetween(1, length / 2);
for (int i = 0; i < bytesToRead; i++) {
int b = si.read();
assertEquals(pbr.get(i) & 0xff, b);
}
si.reset();
// bulk-read all
si.readFully(targetBuf);
assertArrayEquals(pbr.toBytes(), targetBuf);
// continuing to read should now fail with EOFException
try {
si.readByte();
fail("expected EOF");
} catch (EOFException | IndexOutOfBoundsException eof) {
// yay
}
// try to read more than the stream contains
si.reset();
expectThrows(IndexOutOfBoundsException.class, () -> si.readBytes(targetBuf, 0, length * 2));
}
public BytesRef readBytesRef(int length) throws IOException {
if (length == 0) {
return new BytesRef();
}
byte[] bytes = new byte[length];
readBytes(bytes, 0, length);
return new BytesRef(bytes, 0, length);
}
/**
* Reads a bytes reference from this stream, might hold an actual reference to the underlying
* bytes of the stream.
*/
public BytesReference readBytesReference(int length) throws IOException {
if (length == 0) {
return BytesArray.EMPTY;
}
byte[] bytes = new byte[length];
readBytes(bytes, 0, length);
return new BytesArray(bytes, 0, length);
}
public void readFully(byte[] b) throws IOException {
readBytes(b, 0, b.length);
}
@SuppressWarnings({"unchecked"})
@Nullable
public Object readGenericValue() throws IOException {
byte type = readByte();
switch (type) {
case -1:
return null;
case 0:
return readString();
case 1:
return readInt();
case 2:
return readLong();
case 3:
return readFloat();
case 4:
return readDouble();
case 5:
return readBoolean();
case 6:
int bytesSize = readVInt();
byte[] value = new byte[bytesSize];
readBytes(value, 0, bytesSize);
return value;
case 7:
int size = readVInt();
List list = new ArrayList(size);
for (int i = 0; i < size; i++) {
list.add(readGenericValue());
}
return list;
case 8:
int size8 = readVInt();
Object[] list8 = new Object[size8];
for (int i = 0; i < size8; i++) {
list8[i] = readGenericValue();
}
return list8;
case 9:
int size9 = readVInt();
Map map9 = new LinkedHashMap(size9);
for (int i = 0; i < size9; i++) {
map9.put(readString(), readGenericValue());
}
return map9;
case 10:
int size10 = readVInt();
Map map10 = new HashMap(size10);
for (int i = 0; i < size10; i++) {
map10.put(readString(), readGenericValue());
}
return map10;
case 11:
return readByte();
case 12:
return new Date(readLong());
case 13:
return new DateTime(readLong());
case 14:
return readBytesReference();
case 15:
return readText();
case 16:
return readShort();
default:
throw new IOException("Can't read unknown type [" + type + "]");
}
}