/*
* JBoss, Home of Professional Open Source.
* Copyright 2009, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This 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.
*
* This software 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 this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.ejb3.timer.schedule.attribute;
import org.jboss.ejb3.timer.schedule.ScheduleExpressionTypeUtil;
import org.jboss.ejb3.timer.schedule.value.IncrementValue;
import org.jboss.ejb3.timer.schedule.value.ListValue;
import org.jboss.ejb3.timer.schedule.value.RangeValue;
import org.jboss.ejb3.timer.schedule.value.ScheduleExpressionType;
import org.jboss.ejb3.timer.schedule.value.ScheduleValue;
import org.jboss.ejb3.timer.schedule.value.SingleValue;
import javax.ejb.ScheduleExpression;
import java.util.HashSet;
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeSet;
/**
* Represents a {@link Integer} type value in a {@link ScheduleExpression}.
* <p/>
* <p>
* Examples for {@link IntegerBasedExpression} are the value of seconds, years, months etc...
* which allow {@link Integer}.
* </p>
*
* @author Jaikiran Pai
* @version $Revision: $
*/
public abstract class IntegerBasedExpression {
protected abstract Integer getMaxValue();
protected abstract Integer getMinValue();
protected abstract boolean accepts(ScheduleExpressionType scheduleExprType);
protected SortedSet<Integer> absoluteValues = new TreeSet<Integer>();
protected Set<ScheduleValue> relativeValues = new HashSet<ScheduleValue>();
protected ScheduleExpressionType scheduleExpressionType;
protected String origValue;
public IntegerBasedExpression(String value) {
this.origValue = value;
// check the type of value
this.scheduleExpressionType = ScheduleExpressionTypeUtil.getType(value);
if (this.accepts(scheduleExpressionType) == false) {
throw new IllegalArgumentException("Invalid value: " + value + " since " + this.getClass().getName() + " doesn't support values of types " + this.scheduleExpressionType.toString());
}
switch (this.scheduleExpressionType) {
case RANGE:
RangeValue range = new RangeValue(value);
// process the range value
this.processRangeValue(range);
break;
case LIST:
ListValue list = new ListValue(value);
// process the list value
this.processListValue(list);
break;
case INCREMENT:
IncrementValue incrValue = new IncrementValue(value);
// process the increment value
this.processIncrement(incrValue);
break;
case SINGLE_VALUE:
SingleValue singleValue = new SingleValue(value);
// process the single value
this.processSingleValue(singleValue);
break;
case WILDCARD:
// a wildcard is equivalent to "all possible" values, so
// do nothing
break;
default:
throw new IllegalArgumentException("Invalid value for second: " + value);
}
}
protected void processListValue(ListValue list) {
for (String listItem : list.getValues()) {
this.processListItem(listItem);
}
}
protected void processListItem(String listItem) {
// check what type of a value the list item is.
// Each item in the list must be an individual attribute value or a range.
// List items can not themselves be lists, wild-cards, or increments.
ScheduleExpressionType listItemType = ScheduleExpressionTypeUtil.getType(listItem);
switch (listItemType) {
case SINGLE_VALUE:
SingleValue singleVal = new SingleValue(listItem);
this.processSingleValue(singleVal);
return;
case RANGE:
RangeValue range = new RangeValue(listItem);
this.processRangeValue(range);
return;
default:
throw new IllegalArgumentException(
"A list value can only contain either a range or an individual value. Invalid value: " + listItem);
}
}
protected void processRangeValue(RangeValue range) {
String start = range.getStart();
String end = range.getEnd();
if (this.isRelativeValue(start) || this.isRelativeValue(end)) {
this.relativeValues.add(range);
return;
}
Integer rangeStart = this.parseInt(start);
Integer rangeEnd = this.parseInt(end);
// validations
this.assertValid(rangeStart);
this.assertValid(rangeEnd);
// start and end are both the same. So it's just a single value
if (rangeStart == rangeEnd) {
this.absoluteValues.add(rangeStart);
return;
}
if (rangeStart > rangeEnd) {
// In range "x-y", if x is larger than y, the range is equivalent to
// "x-max, min-y", where max is the largest value of the corresponding attribute
// and min is the smallest.
for (int i = rangeStart; i <= this.getMaxValue(); i++) {
this.absoluteValues.add(i);
}
for (int i = this.getMinValue(); i <= rangeEnd; i++) {
this.absoluteValues.add(i);
}
} else {
// just keep adding from range start to range end (both inclusive).
for (int i = rangeStart; i <= rangeEnd; i++) {
this.absoluteValues.add(i);
}
}
}
protected void processIncrement(IncrementValue incr) {
String startValue = incr.getStart();
Integer start = startValue.equals("*") ? 0 : this.parseInt(startValue);
// make sure it's a valid value
this.assertValid(start);
Integer interval = this.parseInt(incr.getInterval());
this.absoluteValues.add(start);
int next = start + interval;
int maxValue = this.getMaxValue();
while (next <= maxValue) {
this.absoluteValues.add(next);
next = next + interval;
}
}
protected void processSingleValue(SingleValue singleValue) {
String value = singleValue.getValue();
if (this.isRelativeValue(value)) {
this.relativeValues.add(singleValue);
} else {
Integer val = this.parseInt(value);
this.assertValid(val);
this.absoluteValues.add(val);
}
}
protected Integer parseInt(String alias) {
if (alias == null) {
return null;
}
return Integer.parseInt(alias.trim());
}
protected void assertValid(Integer value) throws IllegalArgumentException {
if (value == null) {
throw new IllegalArgumentException("Could not parse: " + this.origValue + " in schedule expression");
}
int max = this.getMaxValue();
int min = this.getMinValue();
if (value > max || value < min) {
throw new IllegalArgumentException("Invalid value: " + value + " Valid values are between " + min + " and "
+ max);
}
}
public abstract boolean isRelativeValue(String value);
}