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package com.sun.grizzly.memory;

import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import com.sun.grizzly.Buffer;

/**
 * Class has useful methods to simplify the work with {@link Buffer}s.
 *
 * @see MemoryManager
 * @see WrapperAware
 * 
 * @author Alexey Stashok
 */
public class MemoryUtils {
    /**
     * Returns {@link Buffer}, which wraps the {@link String}.
     *
     * @param memoryManager {@link MemoryManager}, which should be
     *                       used for wrapping.
     * @param s {@link String}
     *
     * @return {@link Buffer} wrapper on top of passed {@link String}.
     */
    public static  E wrap(MemoryManager memoryManager,
            String s) {
        return MemoryUtils.wrap(memoryManager, s, Charset.defaultCharset());
    }

    /**
     * Returns {@link Buffer}, which wraps the {@link String} with the specific
     * {@link Charset}.
     *
     * @param memoryManager {@link MemoryManager}, which should be
     *                       used for wrapping.
     * @param s {@link String}
     * @param charset {@link Charset}, which will be used, when converting
     * {@link String} to byte array.
     *
     * @return {@link Buffer} wrapper on top of passed {@link String}.
     */
    public static  E wrap(MemoryManager memoryManager,
            String s, Charset charset) {
        try {
            byte[] byteRepresentation = s.getBytes(charset.name());
            return MemoryUtils.wrap(memoryManager, byteRepresentation);
        } catch (UnsupportedEncodingException e) {
            throw new IllegalStateException(e);
        }
    }

    /**
     * Returns {@link Buffer}, which wraps the byte array.
     *
     * @param memoryManager {@link MemoryManager}, which should be
     *                       used for wrapping.
     * @param data byte array to wrap.
     *
     * @return {@link Buffer} wrapper on top of passed byte array.
     */
    public static  E wrap(MemoryManager memoryManager,
            byte[] array) {
        return wrap(memoryManager, array, 0, array.length);
    }

    /**
     * Returns {@link Buffer}, which wraps the part of byte array with
     * specific offset and length.
     *
     * @param memoryManager {@link MemoryManager}, which should be
     *                       used for wrapping.
     * @param data byte array to wrap
     * @param offset byte buffer offset
     * @param length byte buffer length
     *
     * @return {@link Buffer} wrapper on top of passed byte array.
     */
    public static  E wrap(MemoryManager memoryManager,
            byte[] array, int offset, int length) {
        if (memoryManager instanceof WrapperAware) {
            return ((WrapperAware) memoryManager).wrap(array, offset, length);
        }
        
        E buffer = memoryManager.allocate(length);
        buffer.put(array, offset, length);
        buffer.flip();
        return buffer;
    }

    /**
     * Returns {@link Buffer}, which wraps the {@link ByteBuffer}.
     *
     * @param memoryManager {@link MemoryManager}, which should be
     *                       used for wrapping.
     * @param byteBuffer {@link ByteBuffer} to wrap
     *
     * @return {@link Buffer} wrapper on top of passed {@link ByteBuffer}.
     */
    public static  E wrap(MemoryManager memoryManager,
            ByteBuffer byteBuffer) {
        if (memoryManager instanceof WrapperAware) {
            return ((WrapperAware) memoryManager).wrap(byteBuffer);
        } else if (byteBuffer.hasArray()) {
            return wrap(memoryManager, byteBuffer.array(),
                    byteBuffer.arrayOffset() + byteBuffer.position(),
                    byteBuffer.remaining());
        }

        throw new IllegalStateException("Can not wrap ByteBuffer");
    }
}