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 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2020 QuestDB
 *
 *  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.
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package io.questdb.std;

import sun.nio.ch.DirectBuffer;

import java.nio.ByteBuffer;

public final class ByteBuffers {


    private ByteBuffers() {
    }

    @SuppressWarnings("unused")
    public static void dump(ByteBuffer b) {
        int p = b.position();
        while (b.hasRemaining()) {
            System.out.print((char) b.get());
        }
        b.position(p);
    }

    public static long getAddress(ByteBuffer buffer) {
        return ((DirectBuffer) buffer).address();
    }

    public static void putStr(ByteBuffer buffer, CharSequence value) {
        int p = buffer.position();
        for (int i = 0; i < value.length(); i++) {
            buffer.putChar(p, value.charAt(i));
            p += 2;
        }
        buffer.position(p);
    }

    /**
     * Releases ByteBuffer if possible. Call semantics should be as follows:
     * 
     * ByteBuffer buffer = ....
     * 
     * buffer = release(buffer);
     *
     * @param     ByteBuffer subclass
     * @param buffer direct byte buffer
     * @return null if buffer is released or same buffer if release is not possible.
     */
    public static  T release(final T buffer) {
        if (buffer instanceof DirectBuffer) {
            ((DirectBuffer) buffer).cleaner().clean();
            return null;
        }
        return buffer;
    }
}