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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 HeapCharBuffer extends CharBuffer {

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

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

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

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

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

    public CharBuffer asReadOnlyBuffer() {
        return this;
        //return new HeapCharBufferR(hb, this.markValue(), this.position(), this.limit(), this.capacity(), offset);
    }

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

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

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

    char getUnchecked(int i) {
        return hb[ix(i)];
    }

    public CharBuffer get(char[] 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 CharBuffer put(char x) {
        hb[ix(nextPutIndex())] = x;
        return this;
    }

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

    public CharBuffer put(char[] 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 CharBuffer put(CharBuffer src) {
        if (src instanceof HeapCharBuffer) {
            if (src == this) throw new IllegalArgumentException();
            HeapCharBuffer sb = (HeapCharBuffer) 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 CharBuffer compact() {
        System.arraycopy(hb, ix(position()), hb, ix(0), remaining());
        position(remaining());
        limit(capacity());
        discardMark();
        return this;
    }

    String toString(int start, int end) {
        try {
            return new String(hb, start + offset, end - start);
        } catch (StringIndexOutOfBoundsException x) {
            throw new IndexOutOfBoundsException();
        }
    }

    public CharBuffer subSequence(int start, int end) {
        if ((start < 0) || (end > length()) || (start > end)) throw new IndexOutOfBoundsException();
        int pos = position();
        return new HeapCharBuffer(hb, -1, pos + start, pos + end, capacity(), offset);
    }

    public ByteOrder order() {
        return ByteOrder.nativeOrder();
    }
}