package com.hwlcn.ldap.util;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Random;
import static com.hwlcn.ldap.util.UtilityMessages.*;
final class FileValuePatternComponent
extends ValuePatternComponent
{
private static final long serialVersionUID = 2773328295435703361L;
private final String[] lines;
private final Random seedRandom;
private final ThreadLocal<Random> random;
FileValuePatternComponent(final String path, final long seed)
throws IOException
{
seedRandom = new Random(seed);
random = new ThreadLocal<Random>();
final ArrayList<String> lineList = new ArrayList<String>(100);
final BufferedReader reader = new BufferedReader(new FileReader(path));
try
{
while (true)
{
final String line = reader.readLine();
if (line == null)
{
break;
}
lineList.add(line);
}
}
finally
{
reader.close();
}
if (lineList.isEmpty())
{
throw new IOException(ERR_VALUE_PATTERN_COMPONENT_EMPTY_FILE.get());
}
lines = new String[lineList.size()];
lineList.toArray(lines);
}
@Override()
void append(final StringBuilder buffer)
{
Random r = random.get();
if (r == null)
{
r = new Random(seedRandom.nextLong());
random.set(r);
}
buffer.append(lines[r.nextInt(lines.length)]);
}
@Override()
boolean supportsBackReference()
{
return true;
}
}