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package com.netflix.astyanax.serializers;

import java.nio.ByteBuffer;

import org.apache.cassandra.db.marshal.BooleanType;

/**
 * Converts bytes to Boolean and vice versa
 * 
 * @author Bozhidar Bozhanov
 * 
 */
public final class BooleanSerializer extends AbstractSerializer {

    private static final BooleanSerializer instance = new BooleanSerializer();

    public static BooleanSerializer get() {
        return instance;
    }

    @Override
    public ByteBuffer toByteBuffer(Boolean obj) {
        if (obj == null) {
            return null;
        }
        boolean bool = obj;
        byte[] b = new byte[1];
        b[0] = bool ? (byte) 1 : (byte) 0;

        return ByteBuffer.wrap(b);
    }

    @Override
    public Boolean fromByteBuffer(ByteBuffer bytes) {
        if ((bytes == null) || (bytes.remaining() < 1)) {
            return null;
        }
        ByteBuffer dup = bytes.duplicate();
        byte b = dup.get();
        return b == (byte) 1;
     }

    @Override
    public ByteBuffer getNext(ByteBuffer byteBuffer) {
        throw new IllegalStateException("Boolean columns can't be paginated");
    }

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

    @Override
    public String getString(ByteBuffer byteBuffer) {
        return fromByteBuffer(byteBuffer).toString();
    }

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

}