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/**
 * Copyright 2013 Netflix, Inc.
 *
 * 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 com.netflix.astyanax.serializers;

import java.nio.ByteBuffer;

import com.netflix.astyanax.shaded.org.apache.cassandra.db.marshal.LongType;

/**
 * Converts bytes to Long and vise a versa
 * 
 * @author Ran Tavory
 * 
 */
public final class LongSerializer extends AbstractSerializer {

    private static final LongSerializer instance = new LongSerializer();

    public static LongSerializer get() {
        return instance;
    }

    @Override
    public ByteBuffer toByteBuffer(Long obj) {
        if (obj == null) {
            return null;
        }
        return ByteBuffer.allocate(8).putLong(0, obj);
    }

    @Override
    public Long fromByteBuffer(ByteBuffer byteBuffer) {
        if (byteBuffer == null)
            return null;
        ByteBuffer dup = byteBuffer.duplicate();
        if (dup.remaining() == 8) {
            long l = dup.getLong();
            return l;
        } else if (dup.remaining() == 4) {
            return (long) dup.getInt();
        }
        return null;
    }

    @Override
    public ComparatorType getComparatorType() {
        return ComparatorType.LONGTYPE;
    }

    @Override
    public ByteBuffer fromString(String str) {
        return LongType.instance.fromString(str);
    }

    @Override
    public String getString(ByteBuffer byteBuffer) {
        return LongType.instance.getString(byteBuffer);
    }

    @Override
    public ByteBuffer getNext(ByteBuffer byteBuffer) {
        Long val = fromByteBuffer(byteBuffer.duplicate());
        if (val == Long.MAX_VALUE) {
            throw new ArithmeticException("Can't paginate past max long");
        }
        return toByteBuffer(val + 1);
    }
}