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BBNonNativeWritableMemoryImpl.java
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BBNonNativeWritableMemoryImpl.java
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.datasketches.memory;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
/**
* Implementation of {@link WritableMemory} for ByteBuffer, non-native byte order.
*
* @author Roman Leventov
* @author Lee Rhodes
*/
final class BBNonNativeWritableMemoryImpl extends NonNativeWritableMemoryImpl {
private static final int id = MEMORY | NONNATIVE | BYTEBUF;
private final Object unsafeObj;
private final long nativeBaseOffset; //used to compute cumBaseOffset
private final ByteBuffer byteBuf; //holds a reference to a ByteBuffer until we are done with it.
private final byte typeId;
BBNonNativeWritableMemoryImpl(
final Object unsafeObj,
final long nativeBaseOffset,
final long regionOffset,
final long capacityBytes,
final int typeId,
final ByteBuffer byteBuf) {
super(unsafeObj, nativeBaseOffset, regionOffset, capacityBytes);
this.unsafeObj = unsafeObj;
this.nativeBaseOffset = nativeBaseOffset;
this.byteBuf = byteBuf;
this.typeId = (byte) (id | (typeId & 0x7));
}
@Override
BaseWritableMemoryImpl toWritableRegion(final long offsetBytes, final long capacityBytes,
final boolean readOnly, final ByteOrder byteOrder) {
final int type = typeId | REGION | (readOnly ? READONLY : 0);
return Util.isNativeOrder(byteOrder)
? new BBWritableMemoryImpl(
unsafeObj, nativeBaseOffset, getRegionOffset(offsetBytes), capacityBytes,
type, getByteBuffer())
: new BBNonNativeWritableMemoryImpl(
unsafeObj, nativeBaseOffset, getRegionOffset(offsetBytes), capacityBytes,
type, getByteBuffer());
}
@Override
BaseWritableBufferImpl toWritableBuffer(final boolean readOnly, final ByteOrder byteOrder) {
final int type = typeId | (readOnly ? READONLY : 0);
return Util.isNativeOrder(byteOrder)
? new BBWritableBufferImpl(
unsafeObj, nativeBaseOffset, getRegionOffset(), getCapacity(),
type, byteBuf, this)
: new BBNonNativeWritableBufferImpl(
unsafeObj, nativeBaseOffset, getRegionOffset(), getCapacity(),
type, byteBuf, this);
}
@Override
public ByteBuffer getByteBuffer() {
assertValid();
return byteBuf;
}
@Override
long getNativeBaseOffset() {
return nativeBaseOffset;
}
@Override
int getTypeId() {
return typeId & 0xff;
}
@Override
Object getUnsafeObject() {
assertValid();
return unsafeObj;
}
}