ByteableDataAccess.java

/*
 *      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.Byteable;
import net.openhft.chronicle.bytes.RandomDataInput;
import net.openhft.chronicle.hash.Data;
import net.openhft.chronicle.hash.serialization.DataAccess;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

public class ByteableDataAccess<T extends Byteable> extends InstanceCreatingMarshaller<T>
        implements DataAccess<T>, Data<T> {

    /** State field */
    private transient T instance;

    public ByteableDataAccess(Class<T> tClass) {
        super(tClass);
    }

    @Override
    public RandomDataInput bytes() {
        return instance.bytesStore();
    }

    @Override
    public long offset() {
        return instance.offset();
    }

    @Override
    public long size() {
        return instance.maxSize();
    }

    @Override
    public T get() {
        return instance;
    }

    @Override
    public T getUsing(@Nullable T using) {
        if (using == null)
            using = createInstance();
        using.bytesStore(instance.bytesStore(), offset(), size());
        return using;
    }

    @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;
        return this;
    }

    @Override
    public void uninit() {
        instance = null;
    }

    @Override
    public DataAccess<T> copy() {
        return new ByteableDataAccess<>(tClass());
    }
}