/*
* 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 org.apache.ignite.internal.processors.hadoop.io;
import org.apache.ignite.hadoop.io.RawMemory;
import org.apache.ignite.internal.util.GridUnsafe;
import org.apache.ignite.internal.util.typedef.internal.S;
/**
* Offheap-based memory.
*/
public class OffheapRawMemory implements RawMemory {
/** Pointer. */
private long ptr;
/** Length. */
private int len;
/**
* Constructor.
*
* @param ptr Pointer.
* @param len Length.
*/
public OffheapRawMemory(long ptr, int len) {
update(ptr, len);
}
/** {@inheritDoc} */
@Override public byte get(int idx) {
ensure(idx, 1);
return GridUnsafe.getByte(ptr + idx);
}
/** {@inheritDoc} */
@Override public short getShort(int idx) {
ensure(idx, 2);
return GridUnsafe.getShort(ptr + idx);
}
/** {@inheritDoc} */
@Override public char getChar(int idx) {
ensure(idx, 2);
return GridUnsafe.getChar(ptr + idx);
}
/** {@inheritDoc} */
@Override public int getInt(int idx) {
ensure(idx, 4);
return GridUnsafe.getInt(ptr + idx);
}
/** {@inheritDoc} */
@Override public long getLong(int idx) {
ensure(idx, 8);
return GridUnsafe.getLong(ptr + idx);
}
/** {@inheritDoc} */
@Override public float getFloat(int idx) {
ensure(idx, 4);
return GridUnsafe.getFloat(ptr + idx);
}
/** {@inheritDoc} */
@Override public double getDouble(int idx) {
ensure(idx, 8);
return GridUnsafe.getDouble(ptr + idx);
}
/** {@inheritDoc} */
@Override public int length() {
return len;
}
/**
* @return Raw pointer.
*/
public long pointer() {
return ptr;
}
/**
* Update pointer and length.
*
* @param ptr Pointer.
* @param len Length.
*/
public void update(long ptr, int len) {
this.ptr = ptr;
this.len = len;
}
/**
* Ensure that the given number of bytes are available for read. Throw an exception otherwise.
*
* @param idx Index.
* @param cnt Count.
*/
private void ensure(int idx, int cnt) {
if (idx < 0 || idx + cnt - 1 >= len)
throw new IndexOutOfBoundsException("Illegal index [len=" + len + ", idx=" + idx + ']');
}
/** {@inheritDoc} */
@Override public String toString() {
return S.toString(OffheapRawMemory.class, this);
}
}