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Chronicle-Map

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/*
 *     Copyright (C) 2015  higherfrequencytrading.com
 *
 *     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 .
 */

package net.openhft.chronicle.map;

import net.openhft.chronicle.hash.serialization.BytesReader;
import net.openhft.chronicle.hash.serialization.internal.MetaBytesWriter;
import net.openhft.lang.io.ByteBufferBytes;

import java.nio.ByteBuffer;

final class ConstantValueProvider implements DefaultValueProvider {
    private static final long serialVersionUID = 0L;

    private transient V value;
    private final int size;
    private final byte[] serializedValueBytes;

     ConstantValueProvider(V value, MetaBytesWriter metaValueWriter, W valueWriter) {
        this.value = value;
        size = (int) metaValueWriter.size(valueWriter, value);
        serializedValueBytes = new byte[size];
        ByteBufferBytes bytes = new ByteBufferBytes(ByteBuffer.wrap(serializedValueBytes));
        metaValueWriter.write(valueWriter, bytes, value);
    }

    boolean wasDeserialized() {
        return value == null;
    }

    void initTransients(BytesReader reader) {
        value = reader.read(new ByteBufferBytes(ByteBuffer.wrap(serializedValueBytes)), size);
    }

    @Override
    public V get(K key) {
        return value;
    }
}