Linux Cron表达式解析

package com.lsz.rpg.util; import java.io.Serializable; import java.text.ParseException; import java.util.HashMap; import java.util.Iterator; import java.util.Locale; import java.util.Map; import java.util.Set; import java.util.StringTokenizer; import java.util.TreeSet; /** * * @author caosi * */ public class CronExpression implements Serializable, Cloneable { private static final long serialVersionUID = 12423409423L; private static final int SECOND = 0; private static final int MINUTE = 1; private static final int HOUR = 2; private static final int DAY_OF_MONTH = 3; private static final int MONTH = 4; private static final int DAY_OF_WEEK = 5; private static final int YEAR = 6; public static final int ALL_SPEC_INT = 99; // '*' public static final int NO_SPEC_INT = 98; // '?' public static final Integer ALL_SPEC = new Integer(ALL_SPEC_INT); public static final Integer NO_SPEC = new Integer(NO_SPEC_INT); private static final Map<String,Integer> monthMap = new HashMap<String,Integer>(20); private static final Map<String,Integer> dayMap = new HashMap<String,Integer>(60); static { monthMap.put("JAN", new Integer(0)); monthMap.put("FEB", new Integer(1)); monthMap.put("MAR", new Integer(2)); monthMap.put("APR", new Integer(3)); monthMap.put("MAY", new Integer(4)); monthMap.put("JUN", new Integer(5)); monthMap.put("JUL", new Integer(6)); monthMap.put("AUG", new Integer(7)); monthMap.put("SEP", new Integer(8)); monthMap.put("OCT", new Integer(9)); monthMap.put("NOV", new Integer(10)); monthMap.put("DEC", new Integer(11)); dayMap.put("SUN", new Integer(1)); dayMap.put("MON", new Integer(2)); dayMap.put("TUE", new Integer(3)); dayMap.put("WED", new Integer(4)); dayMap.put("THU", new Integer(5)); dayMap.put("FRI", new Integer(6)); dayMap.put("SAT", new Integer(7)); } private String cronExpression = null; private transient TreeSet<Integer> seconds; private transient TreeSet<Integer> minutes; private transient TreeSet<Integer> hours; private transient TreeSet<Integer> daysOfMonth; private transient TreeSet<Integer> months; private transient TreeSet<Integer> daysOfWeek; private transient TreeSet<Integer> years; private transient boolean lastdayOfWeek = false; private transient int nthdayOfWeek = 0; private transient boolean lastdayOfMonth = false; private transient boolean nearestWeekday = false; public String getCronExpression() { return cronExpression; } public TreeSet<Integer> getSeconds() { return seconds; } public TreeSet<Integer> getMinutes() { return minutes; } public TreeSet<Integer> getHours() { return hours; } public TreeSet<Integer> getDaysOfMonth() { return daysOfMonth; } public TreeSet<Integer> getMonths() { return months; } public TreeSet<Integer> getDaysOfWeek() { return daysOfWeek; } public TreeSet<Integer> getYears() { return years; } public CronExpression(String cronExpression) throws ParseException { if (cronExpression == null) { throw new IllegalArgumentException("cronExpression cannot be null"); } this.cronExpression = cronExpression.toUpperCase(Locale.US); buildExpression(this.cronExpression); } public String toString() { StringBuffer buf = new StringBuffer(); buf.append("CronExpression:"); buf.append(cronExpression); buf.append("\n"); buf.append("seconds: "); buf.append(getExpressionSetSummary(seconds)); buf.append("\n"); buf.append("minutes: "); buf.append(getExpressionSetSummary(minutes)); buf.append("\n"); buf.append("hours: "); buf.append(getExpressionSetSummary(hours)); buf.append("\n"); buf.append("daysOfMonth: "); buf.append(getExpressionSetSummary(daysOfMonth)); buf.append("\n"); buf.append("months: "); buf.append(getExpressionSetSummary(months)); buf.append("\n"); buf.append("daysOfWeek: "); buf.append(getExpressionSetSummary(daysOfWeek)); buf.append("\n"); buf.append("lastdayOfWeek: "); buf.append(lastdayOfWeek); buf.append("\n"); buf.append("nearestWeekday: "); buf.append(nearestWeekday); buf.append("\n"); buf.append("NthDayOfWeek: "); buf.append(nthdayOfWeek); buf.append("\n"); buf.append("lastdayOfMonth: "); buf.append(lastdayOfMonth); buf.append("\n"); buf.append("years: "); buf.append(getExpressionSetSummary(years)); buf.append("\n"); return buf.toString(); } private void buildExpression(String expression) throws ParseException { try { if (seconds == null) { seconds = new TreeSet<Integer>(); } if (minutes == null) { minutes = new TreeSet<Integer>(); } if (hours == null) { hours = new TreeSet<Integer>(); } if (daysOfMonth == null) { daysOfMonth = new TreeSet<Integer>(); } if (months == null) { months = new TreeSet<Integer>(); } if (daysOfWeek == null) { daysOfWeek = new TreeSet<Integer>(); } if (years == null) { years = new TreeSet<Integer>(); } int exprOn = SECOND; StringTokenizer exprsTok = new StringTokenizer(expression, " \t", false); while (exprsTok.hasMoreTokens() && exprOn <= YEAR) { String expr = exprsTok.nextToken().trim(); // throw an exception if L is used with other days of the month if(exprOn == DAY_OF_MONTH && expr.indexOf('L') != -1 && expr.length() > 1 && expr.indexOf(",") >= 0) { throw new ParseException("Support for specifying 'L' and 'LW' with other days of the month is not implemented", -1); } // throw an exception if L is used with other days of the week if(exprOn == DAY_OF_WEEK && expr.indexOf('L') != -1 && expr.length() > 1 && expr.indexOf(",") >= 0) { throw new ParseException("Support for specifying 'L' with other days of the week is not implemented", -1); } StringTokenizer vTok = new StringTokenizer(expr, ","); while (vTok.hasMoreTokens()) { String v = vTok.nextToken(); storeExpressionVals(0, v, exprOn); } exprOn++; } if (exprOn <= DAY_OF_WEEK) { throw new ParseException("Unexpected end of expression.", expression.length()); } if (exprOn <= YEAR) { storeExpressionVals(0, "*", YEAR); } TreeSet<Integer> dow = getSet(DAY_OF_WEEK); TreeSet<Integer> dom = getSet(DAY_OF_MONTH); // Copying the logic from the UnsupportedOperationException below boolean dayOfMSpec = !dom.contains(NO_SPEC); boolean dayOfWSpec = !dow.contains(NO_SPEC); if (dayOfMSpec && !dayOfWSpec) { // skip } else if (dayOfWSpec && !dayOfMSpec) { // skip } else { throw new ParseException( "Support for