/*
* Copyright 2006 Google Inc.
*
* 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 com.google.gwt.dev.cfg;
import com.google.gwt.core.ext.BadPropertyValueException;
import com.google.gwt.core.ext.ConfigurationProperty;
import com.google.gwt.core.ext.PropertyOracle;
import com.google.gwt.core.ext.SelectionProperty;
import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.dev.util.collect.Sets;
import java.util.List;
import java.util.Set;
/**
* A deferred binding condition to determine whether a named property has a
* particular value.
*/
public class ConditionWhenPropertyIs extends Condition {
private final String propName;
private final String value;
public ConditionWhenPropertyIs(String propName, String value) {
this.propName = propName;
this.value = value;
}
@Override
public Set<String> getRequiredProperties() {
return Sets.create(propName);
}
@Override
public String toString() {
return "<when-property-is name='" + propName + "' value='" + value + "'/>";
}
@Override
protected boolean doEval(TreeLogger logger, DeferredBindingQuery query)
throws UnableToCompleteException {
PropertyOracle propertyOracle = query.getPropertyOracle();
String testValue;
try {
try {
SelectionProperty prop = propertyOracle.getSelectionProperty(logger,
propName);
testValue = prop.getCurrentValue();
} catch (BadPropertyValueException e) {
ConfigurationProperty prop = propertyOracle.getConfigurationProperty(propName);
testValue = prop.getValues().get(0);
}
logger.log(TreeLogger.DEBUG, "Property value is '" + testValue + "'",
null);
if (testValue.equals(value)) {
return true;
} else {
// no exact match was found, see if any fall back
// value would satisfy the condition
try {
SelectionProperty prop = propertyOracle.getSelectionProperty(logger,
propName);
List<? extends Set<String>> fallbackValues = prop.getFallbackValues(value);
if (fallbackValues != null && fallbackValues.size() > 0) {
logger.log(TreeLogger.DEBUG, "Property value '" + value + "'" +
" is the fallback of '" + fallbackValues.toString() + "'", null);
int cost = -1;
for (Set<String> values : fallbackValues) {
for (String fallbackValue : values) {
if (testValue.equals(fallbackValue)) {
query.setFallbackEvaluationCost(cost);
return false;
}
}
cost--;
}
}
}
catch (BadPropertyValueException e) {
// do nothing - currently, only selection
// properties support fall back values
}
return false;
}
} catch (BadPropertyValueException e) {
String msg = "Unable to get value of property '" + propName + "'";
logger.log(TreeLogger.ERROR, msg, e);
throw new UnableToCompleteException();
}
}
@Override
protected String getEvalAfterMessage(String testType, boolean result) {
if (result) {
return "Yes, the property value matched";
} else {
return "No, the value did not match";
}
}
@Override
protected String getEvalBeforeMessage(String testType) {
return toString();
}
}