view src/com/tmate/hgkit/fs/DataAccess.java @ 58:4cfc47bc14cc

Status against local working dir extracted into distinct class. Iterating over local files extracted for ease of os-dependant patching
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 17 Jan 2011 23:01:19 +0100
parents 382cfe9463db
children 9429c7bd1920
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/*
 * Copyright (c) 2010 Artem Tikhomirov 
 */
package com.tmate.hgkit.fs;

import java.io.IOException;

/**
 * relevant parts of DataInput, non-stream nature (seek operation), explicit check for end of data.
 * convenient skip (+/- bytes)
 * Primary goal - effective file read, so that clients don't need to care whether to call few 
 * distinct getInt() or readBytes(totalForFewInts) and parse themselves instead in an attempt to optimize.  
 */
public class DataAccess {
	public boolean isEmpty() {
		return true;
	}
	// absolute positioning
	public void seek(long offset) throws IOException {
		throw new UnsupportedOperationException();
	}
	// relative positioning
	public void skip(int bytes) throws IOException {
		throw new UnsupportedOperationException();
	}
	// shall be called once this object no longer needed
	public void done() {
		// no-op in this empty implementation
	}
	public int readInt() throws IOException {
		byte[] b = new byte[4];
		readBytes(b, 0, 4);
		return b[0] << 24 | (b[1] & 0xFF) << 16 | (b[2] & 0xFF) << 8 | (b[3] & 0xFF);
	}
	public long readLong() throws IOException {
		byte[] b = new byte[8];
		readBytes(b, 0, 8);
		int i1 = b[0] << 24 | (b[1] & 0xFF) << 16 | (b[2] & 0xFF) << 8 | (b[3] & 0xFF);
		int i2 = b[4] << 24 | (b[5] & 0xFF) << 16 | (b[6] & 0xFF) << 8 | (b[7] & 0xFF);
		return ((long) i1) << 32 | ((long) i2 & 0xFFFFFFFF);
	}
	public void readBytes(byte[] buf, int offset, int length) throws IOException {
		throw new UnsupportedOperationException();
	}
	public byte readByte() throws IOException {
		throw new UnsupportedOperationException();
	}
}