org.springframework.cloud.deployer.spi.scheduler.cloudfoundry.expression

Class QuartzCronExpression

java.lang.Object

org.springframework.cloud.deployer.spi.scheduler.cloudfoundry.expression.QuartzCronExpression

public final class QuartzCronExpression
extends Object

Provides a parser and evaluator for unix-like cron expressions. Cron expressions provide the ability to specify complex time combinations such as "At 8:00am every Monday through Friday" or "At 1:30am every last Friday of the month".

Cron expressions are comprised of 6 required fields and one optional field separated by white space. Based on the CronExpression from Quartz.

Author:

Glenn Renfro

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	QuartzCronExpression.ValueSet

Field Summary

Fields

Modifier and Type	Field and Description
protected static Map<String,Integer>	dayMap
static int	MAX_YEAR
protected static Map<String,Integer>	monthMap

Constructor Summary

Constructors

Constructor and Description
QuartzCronExpression(String cronExpression) Constructs a new QuartzCronExpression based on the specified parameter.

Method Summary

Modifier and Type	Method and Description
protected void	addToSet(int val, int end, int incr, int type)
protected void	buildExpression(String expression)
protected int	checkNext(int pos, String s, int val, int type)
protected int	findNextWhiteSpace(int i, String s)
protected int	getDayOfWeekNumber(String s)
protected int	getMonthNumber(String s)
protected int	getNumericValue(String s, int i)
protected QuartzCronExpression.ValueSet	getValue(int v, String s, int i)
protected int	skipWhiteSpace(int i, String s)
protected int	storeExpressionVals(int pos, String s, int type)
String	toString() Returns the string representation of the QuartzCronExpression

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

monthMap

protected static final Map<String,Integer> monthMap

dayMap

protected static final Map<String,Integer> dayMap

MAX_YEAR

public static final int MAX_YEAR

Constructor Detail

QuartzCronExpression

public QuartzCronExpression(String cronExpression)
                     throws ParseException

Constructs a new QuartzCronExpression based on the specified parameter.

Parameters:

cronExpression - String representation of the cron expression the new object should represent

Throws:

ParseException - if the string expression cannot be parsed into a valid QuartzCronExpression

Method Detail

toString

public String toString()

Returns the string representation of the QuartzCronExpression

Overrides:

toString in class Object

Returns:

a string representation of the QuartzCronExpression

buildExpression

protected void buildExpression(String expression)
                        throws ParseException

Throws:

ParseException

checkNext

protected int checkNext(int pos,
                        String s,
                        int val,
                        int type)
                 throws ParseException

Throws:

ParseException

skipWhiteSpace

protected int skipWhiteSpace(int i,
                             String s)

findNextWhiteSpace

protected int findNextWhiteSpace(int i,
                                 String s)

addToSet

protected void addToSet(int val,
                        int end,
                        int incr,
                        int type)
                 throws ParseException

Throws:

ParseException

getValue

protected QuartzCronExpression.ValueSet getValue(int v,
                                                 String s,
                                                 int i)

getNumericValue

protected int getNumericValue(String s,
                              int i)

getMonthNumber

protected int getMonthNumber(String s)

getDayOfWeekNumber

protected int getDayOfWeekNumber(String s)

storeExpressionVals

protected int storeExpressionVals(int pos,
                                  String s,
                                  int type)
                           throws ParseException

Throws:

ParseException