svn-gvsig-desktop / branches / Mobile_Compatible_Hito_1 / libFMap_mobile_shp_driver / src-comp / org / gvsig / datasources / impljme / RandomFileChannelJME.java @ 21865
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package org.gvsig.datasources.impljme; |
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import java.io.File; |
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import java.io.FileNotFoundException; |
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import java.io.IOException; |
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import java.io.RandomAccessFile; |
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import java.nio.ByteOrder; |
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import org.apache.log4j.Logger; |
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import org.gvsig.datasources.common.IByteBuffer; |
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import org.gvsig.datasources.common.IRandomFileChannel; |
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/**
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* This class impelments the random file channel under JME, based on RandomAccessFile
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*
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* @see java.io.RandomAccessFile
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*
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* @author jldominguez
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*
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*/
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public class RandomFileChannelJME implements IRandomFileChannel { |
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private static Logger logger = Logger.getLogger(RandomFileChannelJME.class); |
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private ByteOrder byteOrder = ByteOrder.LITTLE_ENDIAN; |
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private RandomAccessFile raf = null; |
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public RandomFileChannelJME(File f) { |
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try {
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raf = new RandomAccessFile(f, "rw"); |
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} catch (FileNotFoundException e) { |
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e.printStackTrace(); |
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} |
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} |
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public RandomFileChannelJME(String file_path) { |
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File f = new File(file_path); |
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try {
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raf = new RandomAccessFile(f, "rw"); |
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} catch (FileNotFoundException e) { |
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e.printStackTrace(); |
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} |
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} |
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public int write(IByteBuffer aux, int pos) throws IOException { |
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long old_pos = raf.getFilePointer();
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raf.seek(pos); |
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byte[] bb = ((ByteBufferJME) aux).getAllBytes(); |
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raf.write(bb); |
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raf.seek(old_pos); |
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return bb.length;
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} |
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public void close() throws IOException { |
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raf.close(); |
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} |
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public void position(int i) throws IOException { |
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raf.seek(i); |
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} |
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public int write(IByteBuffer buffer) throws IOException { |
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byte[] bb = ((ByteBufferJME) buffer).getAllBytes(); |
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raf.write(bb); |
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return bb.length;
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} |
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public long size() throws IOException { |
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return raf.length();
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} |
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public int getPosition() throws IOException { |
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return (int) raf.getFilePointer(); |
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} |
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/**
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* Reads channel into a buffer. Params are ignored.
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*
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* @param access_mode
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* @param i
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* @param sz
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* @return
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*/
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public ByteBufferJME map(int access_mode, int i, long sz) { |
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ByteBufferJME resp = null;
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try {
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int s = (int) size(); |
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byte[] bb = new byte[s]; |
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long curr_pos = raf.getFilePointer();
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// logger.debug("RandomFileChannelJME map, seek 0 : " + System.currentTimeMillis());
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raf.seek(0);
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// logger.debug("RandomFileChannelJME map, read : " + System.currentTimeMillis());
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raf.read(bb); |
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// logger.debug("RandomFileChannelJME map, seek curr_pos : " + curr_pos + " - " + System.currentTimeMillis());
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raf.seek(curr_pos); |
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// logger.debug("RandomFileChannelJME map, seek done, " + System.currentTimeMillis());
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resp = new ByteBufferJME(bb);
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} catch (IOException e) { |
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// TODO Auto-generated catch block
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e.printStackTrace(); |
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} |
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return resp;
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} |
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public byte get() throws IOException { |
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return raf.readByte();
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} |
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public byte get(int ind) { |
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byte resp = 0; |
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try {
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long old_pos = raf.getFilePointer();
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raf.seek((long) ind);
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resp = raf.readByte(); |
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raf.seek(old_pos); |
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} catch (IOException ioe) { |
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logger.error("While reading far byte: " + ioe.getMessage());
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} |
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return resp;
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} |
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public int getInt() { |
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int resp = 0; |
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try {
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resp = raf.readInt(); |
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} catch (IOException e) { |
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logger.error("While reading integer: " + e.getMessage());
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} |
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if (needsReverse()) {
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return ByteUtil.reverseEndian(resp);
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} else {
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return resp;
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} |
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} |
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public short getShort() { |
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short resp = 0; |
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try {
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resp = raf.readShort(); |
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} catch (IOException e) { |
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logger.error("While reading short: " + e.getMessage());
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} |
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if (needsReverse()) {
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return ByteUtil.reverseEndian(resp);
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} else {
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return resp;
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} |
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} |
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public int getInt(int index) { |
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int resp = 0; |
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try {
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long old_pos = raf.getFilePointer();
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raf.seek((long) index);
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resp = raf.readInt(); |
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raf.seek(old_pos); |
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} catch (IOException ioe) { |
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logger.error("While reading far int: " + ioe.getMessage());
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} |
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if (needsReverse()) {
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return ByteUtil.reverseEndian(resp);
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} else {
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return resp;
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} |
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} |
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public void get(byte[] out) { |
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byte[] aux = new byte[out.length]; |
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try {
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raf.read(aux); |
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} catch (IOException e) { |
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logger.error("While reading byte array: " + e.getMessage());
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} |
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if (needsReverse()) {
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byte[] resp = ByteUtil.reverse(aux); |
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System.arraycopy(resp, 0, out, 0, out.length); |
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} else {
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System.arraycopy(aux, 0, out, 0, out.length); |
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} |
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} |
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public double getDouble() { |
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double resp = 0; |
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try {
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long lb = 0; |
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byte[] aux = new byte[8]; |
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raf.read(aux); |
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if (needsReverse()) {
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byte[] aux2 = ByteUtil.reverse(aux); |
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lb = ByteUtil.arrayToLongBits(aux2, 8);
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} else {
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lb = ByteUtil.arrayToLongBits(aux, 8);
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} |
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resp = Double.longBitsToDouble(lb);
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} catch (IOException e) { |
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logger.error("While reading double: " + e.getMessage());
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} |
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return resp;
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} |
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public void order(ByteOrder o) { |
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byteOrder = o; |
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} |
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private boolean needsReverse() { |
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return (byteOrder == ByteOrder.LITTLE_ENDIAN); |
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} |
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public void getAsIs(byte[] aux) { |
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try {
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raf.read(aux); |
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} catch (IOException e) { |
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logger.error("While getting byte array: " + e.getMessage());
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} |
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} |
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} |