/*

 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package jdk.nashorn.internal.runtime.arrays;

import static jdk.nashorn.internal.runtime.ECMAErrors.typeError;

import java.nio.ByteBuffer;

import jdk.nashorn.internal.objects.Global;

import jdk.nashorn.internal.runtime.PropertyDescriptor;

import jdk.nashorn.internal.runtime.ScriptRuntime;

/**

 * Implementation of {@link ArrayData} that wraps a nio ByteBuffer

 */

final class ByteBufferArrayData extends ArrayData {

    private final ByteBuffer buf;

    ByteBufferArrayData(final int length) {

        super(length);

        this.buf = ByteBuffer.allocateDirect(length);

    }

    /**

     * Constructor

     *

     * @param buf ByteBuffer to create array data with.

     */

    ByteBufferArrayData(final ByteBuffer buf) {

        super(buf.capacity());

        this.buf = buf;

    }

    /**

     * Returns property descriptor for element at a given index

     *

     * @param global the global object

     * @param index  the index

     *

     * @return property descriptor for element

     */

    @Override

    public PropertyDescriptor getDescriptor(final Global global, final int index) {

        // make the index properties not configurable

        return global.newDataDescriptor(getObject(index), false, true, true);

    }

    @Override

    public ArrayData copy() {

        throw unsupported("copy");

    }

    @Override

    public Object[] asObjectArray() {

        throw unsupported("asObjectArray");

    }

    @Override

    public void setLength(final long length) {

        throw new UnsupportedOperationException("setLength");

    }

    @Override

    public ArrayData shiftLeft(final int by) {

        throw unsupported("shiftLeft");

    }

    @Override

    public ArrayData shiftRight(final int by) {

        throw unsupported("shiftRight");

    }

    @Override

    public ArrayData ensure(final long safeIndex) {

        if (safeIndex < buf.capacity()) {

            return this;

        }

        throw unsupported("ensure");

    }

    @Override

    public ArrayData shrink(final long newLength) {

        throw unsupported("shrink");

    }

    @Override

    public ArrayData set(final int index, final Object value, final boolean strict) {

        if (value instanceof Number) {

            buf.put(index, ((Number)value).byteValue());

            return this;

        }

        throw typeError("not.a.number", ScriptRuntime.safeToString(value));

    }

    @Override

    public ArrayData set(final int index, final int value, final boolean strict) {

        buf.put(index, (byte)value);

        return this;

    }

    @Override

    public ArrayData set(final int index, final double value, final boolean strict) {

        buf.put(index, (byte)value);

        return this;

    }

    @Override

    public int getInt(final int index) {

        return 0x0ff & buf.get(index);

    }

    @Override

    public double getDouble(final int index) {

        return 0x0ff & buf.get(index);

    }

    @Override

    public Object getObject(final int index) {

        return 0x0ff & buf.get(index);

    }

    @Override

    public boolean has(final int index) {

        return index > -1 && index < buf.capacity();

    }

    @Override

    public boolean canDelete(final int index, final boolean strict) {

        return false;

    }

    @Override

    public boolean canDelete(final long longIndex, final boolean strict) {

        return false;

    }

    @Override

    public ArrayData delete(final int index) {

        throw unsupported("delete");

    }

    @Override

    public ArrayData delete(final long fromIndex, final long toIndex) {

        throw unsupported("delete");

    }

    @Override

    public ArrayData push(final boolean strict, final Object... items) {

        throw unsupported("push");

    }

    @Override

    public Object pop() {

        throw unsupported("pop");

    }

    @Override

    public ArrayData slice(final long from, final long to) {

        throw unsupported("slice");

    }

    @Override

    public ArrayData convert(final Class<?> type) {

        throw unsupported("convert");

    }

    private static UnsupportedOperationException unsupported(final String method) {

        return new UnsupportedOperationException(method);

    }

}