/*
* Copyright (C) 2012, 2016 higherfrequencytrading.com
* Copyright (C) 2016 Roman Leventov
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package net.openhft.chronicle.hash.serialization.impl;
import net.openhft.chronicle.bytes.Bytes;
import net.openhft.chronicle.bytes.RandomDataInput;
import net.openhft.chronicle.hash.Data;
import net.openhft.chronicle.hash.serialization.BytesWriter;
import net.openhft.chronicle.hash.serialization.DataAccess;
import net.openhft.chronicle.hash.serialization.SizedReader;
import net.openhft.chronicle.wire.WireIn;
import net.openhft.chronicle.wire.WireOut;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import static net.openhft.chronicle.hash.serialization.StatefulCopyable.copyIfNeeded;
import static net.openhft.chronicle.hash.serialization.impl.DefaultElasticBytes.DEFAULT_BYTES_CAPACITY;
public class ExternalBytesMarshallableDataAccess<T> extends InstanceCreatingMarshaller<T>
implements DataAccess<T>, Data<T> {
// Config fields
private SizedReader<T> reader;
private BytesWriter<? super T> writer;
/** Cache field */
private transient Bytes bytes;
/** State field */
private transient T instance;
public ExternalBytesMarshallableDataAccess(
Class<T> tClass, SizedReader<T> reader, BytesWriter<? super T> writer) {
this(tClass, reader, writer, DEFAULT_BYTES_CAPACITY);
}
private ExternalBytesMarshallableDataAccess(
Class<T> tClass, SizedReader<T> reader, BytesWriter<? super T> writer,
long bytesCapacity) {
super(tClass);
this.writer = writer;
this.reader = reader;
initTransients(bytesCapacity);
}
private void initTransients(long bytesCapacity) {
bytes = DefaultElasticBytes.allocateDefaultElasticBytes(bytesCapacity);
}
@Override
public RandomDataInput bytes() {
return bytes.bytesStore();
}
@Override
public long offset() {
return 0;
}
@Override
public long size() {
return bytes.readRemaining();
}
@Override
public T get() {
return instance;
}
@Override
public T getUsing(@Nullable T using) {
if (using == null)
using = createInstance();
T result = reader.read(bytes, size(), using);
bytes.readPosition(0);
return result;
}
@Override
public int hashCode() {
return dataHashCode();
}
@Override
public boolean equals(Object obj) {
return dataEquals(obj);
}
@Override
public String toString() {
return get().toString();
}
@Override
public Data<T> getData(@NotNull T instance) {
this.instance = instance;
bytes.clear();
writer.write(bytes, instance);
return this;
}
@Override
public void uninit() {
instance = null;
}
@Override
public DataAccess<T> copy() {
return new ExternalBytesMarshallableDataAccess<>(
tClass(), copyIfNeeded(reader), copyIfNeeded(writer), bytes.realCapacity());
}
@Override
public void readMarshallable(@NotNull WireIn wireIn) {
super.readMarshallable(wireIn);
reader = wireIn.read(() -> "reader").typedMarshallable();
writer = wireIn.read(() -> "writer").typedMarshallable();
initTransients(DEFAULT_BYTES_CAPACITY);
}
@Override
public void writeMarshallable(@NotNull WireOut wireOut) {
super.writeMarshallable(wireOut);
wireOut.write(() -> "reader").typedMarshallable(reader);
wireOut.write(() -> "writer").typedMarshallable(writer);
}
}