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/* Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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;

import elemental2.core.ArrayBufferView;
import elemental2.core.Float32Array;
import org.gwtproject.nio.HasArrayBufferView;

/**
 * This class wraps a byte buffer to be a float buffer.
 * 

* Implementation notice: *

    *
  • After a byte buffer instance is wrapped, it becomes privately owned by * the adapter. It must NOT be accessed outside the adapter any more.
  • *
  • The byte buffer's position and limit are NOT linked with the adapter. * The adapter extends Buffer, thus has its own position and limit.
  • *
*

*/ final class DirectReadWriteFloatBufferAdapter extends FloatBuffer implements HasArrayBufferView { private final DirectReadWriteByteBuffer byteBuffer; private final Float32Array floatArray; DirectReadWriteFloatBufferAdapter(DirectReadWriteByteBuffer byteBuffer) { super((byteBuffer.capacity() >> 2)); this.byteBuffer = byteBuffer; this.byteBuffer.clear(); this.floatArray = new Float32Array(byteBuffer.byteArray.buffer, byteBuffer.byteArray.byteOffset, capacity); } static FloatBuffer wrap(DirectReadWriteByteBuffer byteBuffer) { return new DirectReadWriteFloatBufferAdapter((DirectReadWriteByteBuffer) byteBuffer.slice()); } @Override public boolean isReadOnly() { return false; } @Override protected float[] protectedArray() { throw new UnsupportedOperationException(); } @Override protected int protectedArrayOffset() { throw new UnsupportedOperationException(); } @Override protected boolean protectedHasArray() { return false; } @Override public FloatBuffer slice() { byteBuffer.limit(limit << 2); byteBuffer.position(position << 2); FloatBuffer result = new DirectReadWriteFloatBufferAdapter((DirectReadWriteByteBuffer) byteBuffer.slice()); byteBuffer.clear(); return result; } @Override public FloatBuffer duplicate() { DirectReadWriteFloatBufferAdapter buf = new DirectReadWriteFloatBufferAdapter( (DirectReadWriteByteBuffer) byteBuffer.duplicate()); buf.limit = limit; buf.position = position; buf.mark = mark; return buf; } // TODO(haustein) This will be slow @Override public FloatBuffer asReadOnlyBuffer() { DirectReadOnlyFloatBufferAdapter buf = new DirectReadOnlyFloatBufferAdapter(byteBuffer); buf.limit = limit; buf.position = position; buf.mark = mark; return buf; } @Override public float get() { return floatArray.getAt(position++).floatValue(); } @Override public FloatBuffer put(float c) { floatArray.setAt(position++, (double)c); return this; } @Override public float get(int index) { return floatArray.getAt(index).floatValue(); } @Override public FloatBuffer put(int index, float c) { floatArray.setAt(index, (double)c); return this; } @Override public FloatBuffer compact() { byteBuffer.limit(limit << 2); byteBuffer.position(position << 2); byteBuffer.compact(); byteBuffer.clear(); position = limit - position; limit = capacity; mark = UNSET_MARK; return this; } @Override public boolean isDirect() { return true; } @Override public ByteOrder order() { return byteBuffer.order(); } public ArrayBufferView getTypedArray() { return floatArray; } public int getElementSize() { return 4; } public int getElementType() { return 0x1406; // GL_FLOAT } }




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