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parquet.io.api.Binary Maven / Gradle / Ivy
/**
* Copyright 2012 Twitter, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package parquet.io.api;
import static parquet.bytes.BytesUtils.UTF8;
import java.io.DataOutput;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.util.Arrays;
import parquet.bytes.BytesUtils;
import parquet.io.ParquetEncodingException;
abstract public class Binary {
public static final Binary EMPTY = fromByteArray(new byte[0]);
public static Binary fromByteArray(
final byte[] value,
final int offset,
final int length) {
return new Binary() {
@Override
public String toStringUsingUTF8() {
return UTF8.decode(ByteBuffer.wrap(value, offset, length)).toString();
// TODO: figure out why the following line was much slower
// rdb: new String(...) is slower because it instantiates a new Decoder,
// while Charset#decode uses a thread-local decoder cache
// return new String(value, offset, length, BytesUtils.UTF8);
}
@Override
public int length() {
return length;
}
@Override
public void writeTo(OutputStream out) throws IOException {
out.write(value, offset, length);
}
@Override
public byte[] getBytes() {
return Arrays.copyOfRange(value, offset, offset + length);
}
@Override
public int hashCode() {
return Binary.hashCode(value, offset, length);
}
@Override
boolean equals(Binary other) {
return other.equals(value, offset, length);
}
@Override
boolean equals(byte[] other, int otherOffset, int otherLength) {
return Binary.equals(value, offset, length, other, otherOffset, otherLength);
}
@Override
public ByteBuffer toByteBuffer() {
return ByteBuffer.wrap(value, offset, length);
}
@Override
public void writeTo(DataOutput out) throws IOException {
out.write(value, offset, length);
}
};
}
public static Binary fromByteArray(final byte[] value) {
return new Binary() {
@Override
public String toStringUsingUTF8() {
return new String(value, BytesUtils.UTF8);
}
@Override
public int length() {
return value.length;
}
@Override
public void writeTo(OutputStream out) throws IOException {
out.write(value);
}
@Override
public byte[] getBytes() {
return value;
}
@Override
public int hashCode() {
return Binary.hashCode(value, 0, value.length);
}
@Override
boolean equals(Binary other) {
return other.equals(value, 0, value.length);
}
@Override
boolean equals(byte[] other, int otherOffset, int otherLength) {
return Binary.equals(value, 0, value.length, other, otherOffset, otherLength);
}
@Override
public ByteBuffer toByteBuffer() {
return ByteBuffer.wrap(value);
}
@Override
public void writeTo(DataOutput out) throws IOException {
out.write(value);
}
};
}
public static Binary fromByteBuffer(final ByteBuffer value) {
return new Binary() {
@Override
public String toStringUsingUTF8() {
return new String(getBytes(), BytesUtils.UTF8);
}
@Override
public int length() {
return value.remaining();
}
@Override
public void writeTo(OutputStream out) throws IOException {
// TODO: should not have to materialize those bytes
out.write(getBytes());
}
@Override
public byte[] getBytes() {
byte[] bytes = new byte[value.remaining()];
value.mark();
value.get(bytes).reset();
return bytes;
}
@Override
public int hashCode() {
if (value.hasArray()) {
return Binary.hashCode(value.array(), value.arrayOffset() + value.position(),
value.arrayOffset() + value.remaining());
}
byte[] bytes = getBytes();
return Binary.hashCode(bytes, 0, bytes.length);
}
@Override
boolean equals(Binary other) {
if (value.hasArray()) {
return other.equals(value.array(), value.arrayOffset() + value.position(),
value.arrayOffset() + value.remaining());
}
byte[] bytes = getBytes();
return other.equals(bytes, 0, bytes.length);
}
@Override
boolean equals(byte[] other, int otherOffset, int otherLength) {
if (value.hasArray()) {
return Binary.equals(value.array(), value.arrayOffset() + value.position(),
value.arrayOffset() + value.remaining(), other, otherOffset, otherLength);
}
byte[] bytes = getBytes();
return Binary.equals(bytes, 0, bytes.length, other, otherOffset, otherLength);
}
@Override
public ByteBuffer toByteBuffer() {
return value;
}
@Override
public void writeTo(DataOutput out) throws IOException {
// TODO: should not have to materialize those bytes
out.write(getBytes());
}
};
}
public static Binary fromString(final String value) {
try {
return fromByteArray(value.getBytes("UTF-8"));
} catch (UnsupportedEncodingException e) {
throw new ParquetEncodingException("UTF-8 not supported.", e);
}
}
/**
* @see {@link Arrays#hashCode(byte[])}
* @param array
* @param offset
* @param length
* @return
*/
private static final int hashCode(byte[] array, int offset, int length) {
int result = 1;
for (int i = offset; i < offset + length; i++) {
byte b = array[i];
result = 31 * result + b;
}
return result;
}
/**
* @see {@link Arrays#equals(byte[], byte[])}
* @param array1
* @param offset1
* @param length1
* @param array2
* @param offset2
* @param length2
* @return
*/
private static final boolean equals(byte[] array1, int offset1, int length1, byte[] array2, int offset2, int length2) {
if (array1 == null && array2 == null) return true;
if (array1 == null || array2 == null) return false;
if (length1 != length2) return false;
if (array1 == array2 && offset1 == offset2) return true;
for (int i = 0; i < length1; i++) {
if (array1[i + offset1] != array2[i + offset2]) {
return false;
}
}
return true;
}
abstract public String toStringUsingUTF8();
abstract public int length();
abstract public void writeTo(OutputStream out) throws IOException;
abstract public void writeTo(DataOutput out) throws IOException;
abstract public byte[] getBytes();
abstract boolean equals(byte[] bytes, int offset, int length);
abstract boolean equals(Binary other);
@Override
public boolean equals(Object obj) {
if (obj == null) {
return false;
}
if (obj instanceof Binary) {
return equals((Binary)obj);
}
return false;
}
abstract public ByteBuffer toByteBuffer();
public String toString() {
return "Binary{" + length() + " bytes, " + Arrays.toString(getBytes()) + "}";
};
}
