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/*
 * Copyright 2016 Carlos Ballesteros Velasco
 *
 * 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 java.nio;

class HeapByteBuffer extends ByteBuffer {

    HeapByteBuffer(int cap, int lim) {
        super(-1, 0, lim, cap, new byte[cap], 0);
    }

    HeapByteBuffer(byte[] buf, int off, int len) {
        super(-1, off, off + len, buf.length, buf, 0);
    }

    protected HeapByteBuffer(byte[] buf, int mark, int pos, int lim, int cap, int off) {
        super(mark, pos, lim, cap, buf, off);
    }

    public ByteBuffer slice() {
        return new HeapByteBuffer(hb, -1, 0, this.remaining(), this.remaining(), this.position() + offset);
    }

    public ByteBuffer duplicate() {
        return new HeapByteBuffer(hb, this.markValue(), this.position(), this.limit(), this.capacity(), offset);
    }

    public ByteBuffer asReadOnlyBuffer() {
        return this;
    }

    protected int ix(int i) {
        return i + offset;
    }

    public byte get() {
        return hb[ix(nextGetIndex())];
    }

    public byte get(int i) {
        return hb[ix(checkIndex(i))];
    }

    public ByteBuffer get(byte[] dst, int offset, int length) {
        checkBounds(offset, length, dst.length);
        if (length > remaining()) throw new BufferUnderflowException();
        System.arraycopy(hb, ix(position()), dst, offset, length);
        position(position() + length);
        return this;
    }

    public boolean isDirect() {
        return false;
    }

    public boolean isReadOnly() {
        return false;
    }

    public ByteBuffer put(byte x) {
        hb[ix(nextPutIndex())] = x;
        return this;
    }

    public ByteBuffer put(int i, byte x) {
        hb[ix(checkIndex(i))] = x;
        return this;
    }

    public ByteBuffer put(byte[] src, int offset, int length) {
        checkBounds(offset, length, src.length);
        if (length > remaining()) throw new BufferOverflowException();
        System.arraycopy(src, offset, hb, ix(position()), length);
        position(position() + length);
        return this;
    }

    public ByteBuffer put(ByteBuffer src) {
        if (src instanceof HeapByteBuffer) {
            if (src == this) throw new IllegalArgumentException();
            HeapByteBuffer sb = (HeapByteBuffer) src;
            int n = sb.remaining();
            if (n > remaining()) throw new BufferOverflowException();
            System.arraycopy(sb.hb, sb.ix(sb.position()), hb, ix(position()), n);
            sb.position(sb.position() + n);
            position(position() + n);
        } else if (src.isDirect()) {
            int n = src.remaining();
            if (n > remaining())
                throw new BufferOverflowException();
            src.get(hb, ix(position()), n);
            position(position() + n);
        } else {
            super.put(src);
        }
        return this;
    }

    public ByteBuffer compact() {
        System.arraycopy(hb, ix(position()), hb, ix(0), remaining());
        position(remaining());
        limit(capacity());
        discardMark();
        return this;
    }

    byte _get(int i) {                          // package-private
        return hb[i];
    }

    void _put(int i, byte b) {                  // package-private
        hb[i] = b;
    }

    public char getChar() {
        return Bits.getChar(this, ix(nextGetIndex(2)), bigEndian);
    }

    public char getChar(int i) {
        return Bits.getChar(this, ix(checkIndex(i, 2)), bigEndian);
    }

    public ByteBuffer putChar(char x) {
        Bits.putChar(this, ix(nextPutIndex(2)), x, bigEndian);
        return this;
    }

    public ByteBuffer putChar(int i, char x) {
        Bits.putChar(this, ix(checkIndex(i, 2)), x, bigEndian);
        return this;
    }

    native public CharBuffer asCharBuffer();

    public short getShort() {
        return Bits.getShort(this, ix(nextGetIndex(2)), bigEndian);
    }

    public short getShort(int i) {
        return Bits.getShort(this, ix(checkIndex(i, 2)), bigEndian);
    }

    public ByteBuffer putShort(short x) {
        Bits.putShort(this, ix(nextPutIndex(2)), x, bigEndian);
        return this;
    }

    public ByteBuffer putShort(int i, short x) {
        Bits.putShort(this, ix(checkIndex(i, 2)), x, bigEndian);
        return this;
    }

    public native ShortBuffer asShortBuffer();

    public int getInt() {
        return Bits.getInt(this, ix(nextGetIndex(4)), bigEndian);
    }

    public int getInt(int i) {
        return Bits.getInt(this, ix(checkIndex(i, 4)), bigEndian);
    }

    public ByteBuffer putInt(int x) {
        Bits.putInt(this, ix(nextPutIndex(4)), x, bigEndian);
        return this;
    }

    public ByteBuffer putInt(int i, int x) {
        Bits.putInt(this, ix(checkIndex(i, 4)), x, bigEndian);
        return this;
    }

    native public IntBuffer asIntBuffer();

    public long getLong() {
        return Bits.getLong(this, ix(nextGetIndex(8)), bigEndian);
    }

    public long getLong(int i) {
        return Bits.getLong(this, ix(checkIndex(i, 8)), bigEndian);
    }

    public ByteBuffer putLong(long x) {
        Bits.putLong(this, ix(nextPutIndex(8)), x, bigEndian);
        return this;
    }

    public ByteBuffer putLong(int i, long x) {
        Bits.putLong(this, ix(checkIndex(i, 8)), x, bigEndian);
        return this;
    }

    native public LongBuffer asLongBuffer();

    public float getFloat() {
        return Bits.getFloat(this, ix(nextGetIndex(4)), bigEndian);
    }

    public float getFloat(int i) {
        return Bits.getFloat(this, ix(checkIndex(i, 4)), bigEndian);
    }

    public ByteBuffer putFloat(float x) {
        Bits.putFloat(this, ix(nextPutIndex(4)), x, bigEndian);
        return this;
    }

    public ByteBuffer putFloat(int i, float x) {
        Bits.putFloat(this, ix(checkIndex(i, 4)), x, bigEndian);
        return this;
    }

    native public FloatBuffer asFloatBuffer();

    public double getDouble() {
        return Bits.getDouble(this, ix(nextGetIndex(8)), bigEndian);
    }

    public double getDouble(int i) {
        return Bits.getDouble(this, ix(checkIndex(i, 8)), bigEndian);
    }

    public ByteBuffer putDouble(double x) {
        Bits.putDouble(this, ix(nextPutIndex(8)), x, bigEndian);
        return this;
    }

    public ByteBuffer putDouble(int i, double x) {
        Bits.putDouble(this, ix(checkIndex(i, 8)), x, bigEndian);
        return this;
    }

    native public DoubleBuffer asDoubleBuffer();
}