BytesMarshallableMarshaller.java

/*
 * Copyright 2016 higherfrequencytrading.com
 *
 * 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 net.openhft.lang.io.serialization.impl;

import net.openhft.lang.io.Bytes;
import net.openhft.lang.io.NativeBytes;
import net.openhft.lang.io.serialization.BytesMarshallable;
import net.openhft.lang.io.serialization.BytesMarshaller;
import net.openhft.lang.model.constraints.NotNull;
import net.openhft.lang.model.constraints.Nullable;

/**
 * @author peter.lawrey
 */
public class BytesMarshallableMarshaller<E extends BytesMarshallable>
        implements BytesMarshaller<E> {
    private static final long serialVersionUID = 0L;
    @NotNull
    private final Class<E> classMarshaled;

    public BytesMarshallableMarshaller(@NotNull Class<E> classMarshaled) {
        this.classMarshaled = classMarshaled;
    }

    public final Class<E> marshaledClass() {
        return classMarshaled;
    }

    @Override
    public void write(@NotNull Bytes bytes, @NotNull E e) {
        e.writeMarshallable(bytes);
    }

    @Override
    public E read(@NotNull Bytes bytes) {
        return read(bytes, null);
    }

    @Nullable
    @Override
    public E read(Bytes bytes, @Nullable E e) {
        if (e == null) {
            try {
                e = getInstance();
            } catch (Exception e2) {
                throw new IllegalStateException(e2);
            }
        }
        e.readMarshallable(bytes);
        return e;
    }

    @SuppressWarnings("unchecked")
    @NotNull
    protected E getInstance() throws Exception {
        return (E) NativeBytes.UNSAFE.allocateInstance(classMarshaled);
    }

    @Override
    public boolean equals(Object obj) {
        return obj != null && obj.getClass() == getClass() &&
                ((BytesMarshallableMarshaller) obj).classMarshaled == classMarshaled;
    }

    @Override
    public int hashCode() {
        return classMarshaled.hashCode();
    }

    @Override
    public String toString() {
        return getClass().getSimpleName() + "{classMarshaled=" + classMarshaled + "}";
    }
}