/*
* -----------------------------------------------------------------------
* Copyright © 2013-2016 Meno Hochschild, <http://www.menodata.de/>
* -----------------------------------------------------------------------
* This file (DefaultLeapSecondProviderSPI.java) is part of project Time4J.
*
* Time4J is free software: You can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation, either version 2.1 of the License, or
* (at your option) any later version.
*
* Time4J is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Time4J. If not, see <http://www.gnu.org/licenses/>.
* -----------------------------------------------------------------------
*/
package net.time4j.scale.spi;
import net.time4j.PlainDate;
import net.time4j.Platform;
import net.time4j.base.GregorianDate;
import net.time4j.base.ResourceLoader;
import net.time4j.format.TemporalFormatter;
import net.time4j.scale.LeapSecondProvider;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.URI;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.Map;
import static net.time4j.scale.LeapSeconds.PATH_TO_LEAPSECONDS;
/**
* <p>{@code ServiceProvider}-implementation for accessing the file
* "leapseconds.data" in class path. </p>
*
* @author Meno Hochschild
*/
public final class DefaultLeapSecondProviderSPI
implements LeapSecondProvider {
//~ Instanzvariablen --------------------------------------------------
private final String source;
private final PlainDate expires;
private final Map<GregorianDate, Integer> table;
//~ Konstruktoren -----------------------------------------------------
public DefaultLeapSecondProviderSPI() {
super();
PlainDate tmpExpires = PlainDate.axis().getMinimum();
this.table = new LinkedHashMap<>(50);
String name = PATH_TO_LEAPSECONDS;
URI uri = ResourceLoader.getInstance().locate("core", LeapSecondProvider.class, name);
InputStream is = ResourceLoader.getInstance().load(uri, true);
if (is == null) {
is = LeapSecondProvider.class.getClassLoader().getResourceAsStream(name); // test classes in IDE
}
if (is != null) {
this.source = uri.toString();
TemporalFormatter<PlainDate> f = PlainDate.localFormatter("yyyy-MM-dd", Platform.PATTERN);
try {
BufferedReader br =
new BufferedReader(
new InputStreamReader(is, "US-ASCII"));
String line;
while ((line = br.readLine()) != null) {
if (line.startsWith("#")) {
continue; // Kommentarzeile überspringen
} else if (line.startsWith("@expires=")) {
String date = line.substring(9);
tmpExpires = f.parse(date);
continue;
}
int comma = line.indexOf(',');
String date;
Boolean sign = null;
if (comma == -1) {
date = line.trim();
sign = Boolean.TRUE;
} else {
date = line.substring(0, comma).trim();
String s = line.substring(comma + 1).trim();
if (s.length() == 1) {
char c = s.charAt(0);
if (c == '+') {
sign = Boolean.TRUE;
} else if (c == '-') {
sign = Boolean.FALSE;
}
}
if (sign == null) {
throw new IllegalStateException(
"Missing leap second sign.");
}
}
int year = Integer.parseInt(date.substring(0, 4));
int month = Integer.parseInt(date.substring(5, 7));
int dom = Integer.parseInt(date.substring(8, 10));
Object old =
this.table.put(
PlainDate.of(year, month, dom),
Integer.valueOf(sign.booleanValue() ? 1 : -1)
);
if (old != null) {
throw new IllegalStateException(
"Duplicate leap second event found.");
}
}
} catch (UnsupportedEncodingException uee) {
throw new AssertionError(uee);
} catch (IllegalStateException ise) {
throw ise;
} catch (Exception ex) {
throw new IllegalStateException(ex);
} finally {
try {
is.close();
} catch (IOException ioe) {
ioe.printStackTrace(System.err);
}
}
} else {
this.source = "";
System.err.println("Warning: File \"" + name + "\" not found.");
}
this.expires = tmpExpires;
}
//~ Methoden ----------------------------------------------------------
@Override
public Map<GregorianDate, Integer> getLeapSecondTable() {
return Collections.unmodifiableMap(this.table);
}
@Override
public boolean supportsNegativeLS() {
return true;
}
@Override
public GregorianDate getDateOfEvent(
int year,
int month,
int dayOfMonth
) {
return PlainDate.of(year, month, dayOfMonth);
}
@Override
public GregorianDate getDateOfExpiration() {
return this.expires;
}
@Override
public String toString() {
return this.source;
}
}