/*
* 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.PropertyOracle;
import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.core.ext.typeinfo.JClassType;
import com.google.gwt.core.ext.typeinfo.TypeOracle;
import com.google.gwt.dev.util.Util;
/**
* A deferred binding condition to determine whether the type being rebound is
* assignment-compatible with a particular type.
*/
public class ConditionWhenTypeAssignableTo extends Condition {
private final String assignableToTypeName;
public ConditionWhenTypeAssignableTo(String assignableToTypeName) {
this.assignableToTypeName = assignableToTypeName;
}
public String getAssignableToTypeName() {
return assignableToTypeName;
}
public String toString() {
return "<when-assignable class='" + assignableToTypeName + "'/>";
}
protected boolean doEval(TreeLogger logger, PropertyOracle propertyOracle,
TypeOracle typeOracle, String testType) throws UnableToCompleteException {
JClassType fromType = typeOracle.findType(testType);
if (fromType == null) {
Util.logMissingTypeErrorWithHints(logger, testType);
throw new UnableToCompleteException();
}
JClassType toType = typeOracle.findType(assignableToTypeName);
if (toType == null) {
// If we don't know the type, it can't be assignable to it.
// This isn't a strict failure case because stale rules can reference
// types that have been deleted.
//
logger.log(TreeLogger.WARN, "Unknown type '" + assignableToTypeName
+ "' specified in deferred binding rule", null);
return false;
}
if (fromType.isAssignableTo(toType)) {
return true;
} else {
return false;
}
}
protected String getEvalAfterMessage(String testType, boolean result) {
if (result) {
return "Yes, the requested type was assignable";
} else {
return "No, the requested type was not assignable";
}
}
protected String getEvalBeforeMessage(String testType) {
return toString();
}
}