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package org.netbeans.lib.profiler.heap;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
/**
*
* @author Tomas Hurka
*/
class HprofLongMappedByteBuffer extends HprofByteBuffer {
//~ Static fields/initializers -----------------------------------------------------------------------------------------------
private static int BUFFER_SIZE_BITS = 30;
private static long BUFFER_SIZE = 1L << BUFFER_SIZE_BITS;
private static int BUFFER_SIZE_MASK = (int) ((BUFFER_SIZE) - 1);
private static int BUFFER_EXT = 32 * 1024;
//~ Instance fields ----------------------------------------------------------------------------------------------------------
private MappedByteBuffer[] dumpBuffer;
//~ Constructors -------------------------------------------------------------------------------------------------------------
HprofLongMappedByteBuffer(File dumpFile) throws IOException {
FileInputStream fis = new FileInputStream(dumpFile);
FileChannel channel = fis.getChannel();
length = channel.size();
dumpBuffer = new MappedByteBuffer[(int) (((length + BUFFER_SIZE) - 1) / BUFFER_SIZE)];
for (int i = 0; i < dumpBuffer.length; i++) {
long position = i * BUFFER_SIZE;
long size = Math.min(BUFFER_SIZE + BUFFER_EXT, length - position);
dumpBuffer[i] = channel.map(FileChannel.MapMode.READ_ONLY, position, size);
}
channel.close();
readHeader();
}
//~ Methods ------------------------------------------------------------------------------------------------------------------
char getChar(long index) {
return dumpBuffer[getBufferIndex(index)].getChar(getBufferOffset(index));
}
double getDouble(long index) {
return dumpBuffer[getBufferIndex(index)].getDouble(getBufferOffset(index));
}
float getFloat(long index) {
return dumpBuffer[getBufferIndex(index)].getFloat(getBufferOffset(index));
}
int getInt(long index) {
return dumpBuffer[getBufferIndex(index)].getInt(getBufferOffset(index));
}
long getLong(long index) {
return dumpBuffer[getBufferIndex(index)].getLong(getBufferOffset(index));
}
short getShort(long index) {
return dumpBuffer[getBufferIndex(index)].getShort(getBufferOffset(index));
}
// delegate to MappedByteBuffer
byte get(long index) {
return dumpBuffer[getBufferIndex(index)].get(getBufferOffset(index));
}
synchronized void get(long position, byte[] chars) {
MappedByteBuffer buffer = dumpBuffer[getBufferIndex(position)];
buffer.position(getBufferOffset(position));
buffer.get(chars);
}
private int getBufferIndex(long index) {
return (int) (index >> BUFFER_SIZE_BITS);
}
private int getBufferOffset(long index) {
return (int) (index & BUFFER_SIZE_MASK);
}
}