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one.nio.util.DateFormatGenerator Maven / Gradle / Ivy
/*
* Copyright 2020 Odnoklassniki Ltd, Mail.Ru Group
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package one.nio.util;
import one.nio.gen.BytecodeGenerator;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.MethodVisitor;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import java.util.TimeZone;
import java.util.concurrent.atomic.AtomicInteger;
public class DateFormatGenerator extends BytecodeGenerator {
private static final AtomicInteger index = new AtomicInteger();
private static final String[] DAY_NAMES = {"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"};
private static final String[] MONTH_NAMES = {"", "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
private static final int YEAR = 1;
private static final int MONTH = 2;
private static final int DAY_OF_MONTH = 3;
private static final int DAY_OF_WEEK = 4;
private static final int HOUR = 5;
private static final int MINUTE = 6;
private static final int SECOND = 7;
private static final int MILLISECOND = 8;
private static final int ZONE_OFFSET = 9;
private static final int TIME_ZONE = 10;
static DateFormat generateForPattern(String pattern, String timeZone) {
List fields = new ArrayList<>();
int fieldSet = 0;
int patternWidth = 0;
int length = pattern.length();
boolean literal = false;
for (int i = 0; i < length; i++) {
char c = pattern.charAt(i);
if (c == '\'') {
literal = !literal;
} else if ((c >= 'A' && c <= 'Z' || c >= 'a' && c <= 'z') && !literal) {
int start = i;
while (i + 1 < length && pattern.charAt(i + 1) == c) {
i++;
}
CalendarField field = getCalendarField(c, i - start + 1);
if (field == null) {
throw new IllegalArgumentException("Invalid format character '" + c + "' at position " + i);
}
fields.add(field);
patternWidth += field.width;
fieldSet |= 1 << field.type;
} else if (c == '"' && !literal) {
fields.add('\'');
patternWidth++;
} else {
fields.add(c);
patternWidth++;
}
}
return new DateFormatGenerator().generate(fields, fieldSet, patternWidth, timeZone);
}
private DateFormat generate(List fields, int fieldSet, int patternWidth, String timeZone) {
String className = "one/nio/util/GeneratedDateFormat" + index.getAndIncrement();
ClassWriter cv = new ClassWriter(ClassWriter.COMPUTE_MAXS | ClassWriter.COMPUTE_FRAMES);
cv.visit(V1_6, ACC_PUBLIC | ACC_FINAL, className, null, "one/nio/util/DateFormat", new String[0]);
cv.visitField(ACC_PRIVATE | ACC_STATIC | ACC_FINAL, "tz", "Ljava/util/TimeZone;", null, null).visitEnd();
MethodVisitor mv = cv.visitMethod(ACC_PUBLIC, "", "()V", null, null);
mv.visitCode();
mv.visitLdcInsn(timeZone);
mv.visitMethodInsn(INVOKESTATIC, "java/util/TimeZone", "getTimeZone", "(Ljava/lang/String;)Ljava/util/TimeZone;", false);
mv.visitFieldInsn(PUTSTATIC, className, "tz", "Ljava/util/TimeZone;");
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
mv = cv.visitMethod(ACC_PUBLIC, "", "()V", null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, "one/nio/util/DateFormat", "", "()V", false);
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
mv = cv.visitMethod(ACC_PUBLIC | ACC_FINAL, "format", "(J)Ljava/lang/String;", null, null);
mv.visitCode();
boolean isUTC = "GMT".equals(timeZone) || "UTC".equals(timeZone);
if (!isUTC) {
// millis += tz.getOffset(millis);
mv.visitVarInsn(LLOAD, 1);
mv.visitFieldInsn(GETSTATIC, className, "tz", "Ljava/util/TimeZone;");
mv.visitVarInsn(LLOAD, 1);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/util/TimeZone", "getOffset", "(J)I", false);
if ((fieldSet & (1 << ZONE_OFFSET)) != 0) {
mv.visitInsn(DUP);
mv.visitVarInsn(ISTORE, 4);
}
mv.visitInsn(I2L);
mv.visitInsn(LADD);
mv.visitVarInsn(LSTORE, 1);
}
if ((fieldSet & (1 << YEAR | 1 << MONTH | 1 << DAY_OF_MONTH)) != 0) {
// int date = dateOfMillis(millis);
mv.visitVarInsn(LLOAD, 1);
mv.visitMethodInsn(INVOKESTATIC, "one/nio/util/Dates", "dateOfMillis", "(J)I", false);
mv.visitVarInsn(ISTORE, 5);
}
if ((fieldSet & (1 << HOUR | 1 << MINUTE | 1 << SECOND)) != 0) {
// int time = (int) ((millis - JAN_1_1600) % MS_IN_DAY) / 1000;
mv.visitVarInsn(LLOAD, 1);
mv.visitLdcInsn(Dates.JAN_1_1600);
mv.visitInsn(LSUB);
mv.visitLdcInsn(Dates.MS_IN_DAY);
mv.visitInsn(LREM);
mv.visitInsn(L2I);
emitInt(mv, 1000);
mv.visitInsn(IDIV);
mv.visitVarInsn(ISTORE, 6);
}
emitInt(mv, patternWidth);
mv.visitIntInsn(NEWARRAY, T_CHAR);
mv.visitVarInsn(ASTORE, 3);
int off = 0;
for (Object f : fields) {
mv.visitVarInsn(ALOAD, 3);
emitInt(mv, off);
if (f instanceof Character) {
emitInt(mv, (Character) f);
mv.visitInsn(CASTORE);
off++;
} else {
CalendarField cf = (CalendarField) f;
switch (cf.type) {
case YEAR:
mv.visitVarInsn(ILOAD, 5);
mv.visitMethodInsn(INVOKESTATIC, "one/nio/util/Dates", "year", "(I)I", false);
mv.visitMethodInsn(INVOKESTATIC, "one/nio/util/DateFormatGenerator", "putYear" + cf.width, "([CII)V", false);
break;
case MONTH:
mv.visitVarInsn(ILOAD, 5);
mv.visitMethodInsn(INVOKESTATIC, "one/nio/util/Dates", "month", "(I)I", false);
mv.visitMethodInsn(INVOKESTATIC, "one/nio/util/DateFormatGenerator", cf.width == 3 ? "putMonth" : "putInt", "([CII)V", false);
break;
case DAY_OF_MONTH:
mv.visitVarInsn(ILOAD, 5);
mv.visitMethodInsn(INVOKESTATIC, "one/nio/util/Dates", "day", "(I)I", false);
mv.visitMethodInsn(INVOKESTATIC, "one/nio/util/DateFormatGenerator", "putInt", "([CII)V", false);
break;
case DAY_OF_WEEK:
mv.visitVarInsn(LLOAD, 1);
mv.visitMethodInsn(INVOKESTATIC, "one/nio/util/Dates", "dayNum", "(J)I", false);
mv.visitMethodInsn(INVOKESTATIC, "one/nio/util/DateFormatGenerator", "putDayOfWeek", "([CII)V", false);
break;
case HOUR:
mv.visitVarInsn(ILOAD, 6);
emitInt(mv, 3600);
mv.visitInsn(IDIV);
mv.visitMethodInsn(INVOKESTATIC, "one/nio/util/DateFormatGenerator", "putInt", "([CII)V", false);
break;
case MINUTE:
mv.visitVarInsn(ILOAD, 6);
emitInt(mv, 3600);
mv.visitInsn(IREM);
emitInt(mv, 60);
mv.visitInsn(IDIV);
mv.visitMethodInsn(INVOKESTATIC, "one/nio/util/DateFormatGenerator", "putInt", "([CII)V", false);
break;
case SECOND:
mv.visitVarInsn(ILOAD, 6);
emitInt(mv, 60);
mv.visitInsn(IREM);
mv.visitMethodInsn(INVOKESTATIC, "one/nio/util/DateFormatGenerator", "putInt", "([CII)V", false);
break;
case MILLISECOND:
mv.visitVarInsn(LLOAD, 1);
mv.visitLdcInsn(Dates.JAN_1_1600);
mv.visitInsn(LSUB);
mv.visitLdcInsn(1000L);
mv.visitInsn(LREM);
mv.visitInsn(L2I);
mv.visitMethodInsn(INVOKESTATIC, "one/nio/util/DateFormatGenerator", "putMillis" + cf.width, "([CII)V", false);
break;
case ZONE_OFFSET:
if (isUTC) {
emitInt(mv, 0);
} else {
mv.visitVarInsn(ILOAD, 4);
emitInt(mv, 60000);
mv.visitInsn(IDIV);
}
mv.visitMethodInsn(INVOKESTATIC, "one/nio/util/DateFormatGenerator", "putZoneOffset", "([CII)V", false);
break;
case TIME_ZONE:
String id = TimeZone.getTimeZone(timeZone).getDisplayName(false, TimeZone.SHORT, Locale.US);
for (int i = 0; i < id.length(); i++) {
if (i != 0) {
mv.visitVarInsn(ALOAD, 3);
emitInt(mv, off + i);
}
emitInt(mv, id.charAt(i));
mv.visitInsn(CASTORE);
}
break;
default:
throw new AssertionError("Should not reach here");
}
off += cf.width;
}
}
mv.visitTypeInsn(NEW, "java/lang/String");
mv.visitInsn(DUP);
mv.visitVarInsn(ALOAD, 3);
mv.visitMethodInsn(INVOKESPECIAL, "java/lang/String", "", "([C)V", false);
mv.visitInsn(ARETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
cv.visitEnd();
return instantiate(cv.toByteArray(), DateFormat.class);
}
private static CalendarField getCalendarField(char c, int width) {
switch (c) {
case 'y':
return width == 2 || width == 4 ? new CalendarField(YEAR, width) : null;
case 'M':
return width == 2 || width == 3 ? new CalendarField(MONTH, width) : null;
case 'd':
return width == 2 ? new CalendarField(DAY_OF_MONTH, width) : null;
case 'H':
return width == 2 ? new CalendarField(HOUR, width) : null;
case 'm':
return width == 2 ? new CalendarField(MINUTE, width) : null;
case 's':
return width == 2 ? new CalendarField(SECOND, width) : null;
case 'S':
return width <= 3 ? new CalendarField(MILLISECOND, width) : null;
case 'E':
return width <= 3 ? new CalendarField(DAY_OF_WEEK, 3) : null;
case 'z':
return width <= 3 ? new CalendarField(TIME_ZONE, 3) : null;
case 'Z':
return new CalendarField(ZONE_OFFSET, 5);
default:
return null;
}
}
static class CalendarField {
final int type;
final int width;
CalendarField(int type, int width) {
this.type = type;
this.width = width;
}
}
// The following helper methods are called from the generated code
public static void putYear4(char[] buf, int off, int year) {
buf[off] = (char) (year / 1000 + '0');
buf[off + 1] = (char) (year % 1000 / 100 + '0');
buf[off + 2] = (char) (year % 100 / 10 + '0');
buf[off + 3] = (char) (year % 10 + '0');
}
public static void putYear2(char[] buf, int off, int year) {
buf[off] = (char) (year % 100 / 10 + '0');
buf[off + 1] = (char) (year % 10 + '0');
}
public static void putMonth(char[] buf, int off, int month) {
String s = MONTH_NAMES[month];
buf[off] = s.charAt(0);
buf[off + 1] = s.charAt(1);
buf[off + 2] = s.charAt(2);
}
public static void putDayOfWeek(char[] buf, int off, int dayNum) {
String s = DAY_NAMES[(dayNum + 5) % 7];
buf[off] = s.charAt(0);
buf[off + 1] = s.charAt(1);
buf[off + 2] = s.charAt(2);
}
public static void putMillis3(char[] buf, int off, int millis) {
buf[off] = (char) (millis / 100 + '0');
buf[off + 1] = (char) (millis % 100 / 10 + '0');
buf[off + 2] = (char) (millis % 10 + '0');
}
public static void putMillis2(char[] buf, int off, int millis) {
buf[off] = (char) (millis / 100 + '0');
buf[off + 1] = (char) (millis % 100 / 10 + '0');
}
public static void putMillis1(char[] buf, int off, int millis) {
buf[off] = (char) (millis / 100 + '0');
}
public static void putZoneOffset(char[] buf, int off, int zoneOffset) {
buf[off] = zoneOffset >= 0 ? '+' : '-';
putInt(buf, off + 1, zoneOffset / 60);
putInt(buf, off + 3, zoneOffset % 60);
}
public static void putInt(char[] buf, int off, int n) {
buf[off] = (char) (n / 10 + '0');
buf[off + 1] = (char) (n % 10 + '0');
}
}
