/*
* RHQ Management Platform
* Copyright (C) 2005-2009 Red Hat, Inc.
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation version 2 of the License.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
package org.rhq.coregui.client.components.form;
import java.util.Set;
import com.smartgwt.client.widgets.form.fields.SelectItem;
import com.smartgwt.client.widgets.form.validator.CustomValidator;
import org.rhq.core.domain.measurement.MeasurementDefinition;
import org.rhq.core.domain.measurement.MeasurementUnits;
import org.rhq.coregui.client.util.measurement.MeasurementParser;
/**
* Validates user entered numbers with units. This validator can be given
* the units directly or it can derive the units based on a selection component
* whose keys are measurement definition IDs - the measurement definitions must be
* given so the ID can be looked up.
*
* @author John Mazzitelli
*/
public class NumberWithUnitsValidator extends CustomValidator {
private final MeasurementUnits units;
private final Set<MeasurementDefinition> metricDefs;
private final SelectItem metricDropDownMenu;
public NumberWithUnitsValidator(Set<MeasurementDefinition> metricDefs, SelectItem metricDropDownMenu) {
if (metricDefs == null) {
throw new NullPointerException("metricDefs == null");
}
if (metricDropDownMenu == null) {
throw new NullPointerException("metricDropDownMenu == null");
}
this.metricDefs = metricDefs;
this.metricDropDownMenu = metricDropDownMenu;
this.units = null;
}
public NumberWithUnitsValidator(MeasurementUnits units) {
if (units == null) {
throw new NullPointerException("units == null");
}
this.metricDefs = null;
this.metricDropDownMenu = null;
this.units = units;
}
@Override
protected boolean condition(Object value) {
// don't know if this is the right thing to do, but assume the value was optional.
// if there is no value or its empty, assume that is OK and will be considered a 0
if (value == null || value.toString().trim().length() == 0) {
return true;
}
MeasurementUnits unitsToUse = this.units;
if (unitsToUse == null) {
// units weren't directly given to us, find it from the selected metric definition
try {
String idString = metricDropDownMenu.getValueAsString();
Integer id = Integer.parseInt(idString);
for (MeasurementDefinition metricDef : this.metricDefs) {
if (metricDef.getId() == id.intValue()) {
unitsToUse = metricDef.getUnits();
break;
}
}
} catch (Exception e) {
unitsToUse = null;
}
}
if (unitsToUse != null) {
try {
return MeasurementParser.parse(value.toString(), unitsToUse) != null;
} catch (Exception e) {
return false;
}
} else {
// no units? just see if its a valid floating point number
try {
Double.parseDouble(value.toString());
return true;
} catch (Exception e) {
return false;
}
}
}
}