/*
* Copyright 2016 Red Hat, Inc. and/or its affiliates.
*
* 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 org.drools.workbench.services.verifier.api.client.index.select;
import org.drools.workbench.services.verifier.api.client.maps.MultiMapChangeHandler;
import org.drools.workbench.services.verifier.api.client.index.keys.Value;
import org.drools.workbench.services.verifier.api.client.index.matchers.Matcher;
class ChangeHelper<T> {
private final Select<T> addedSelector;
private final Select<T> removedSelector;
ChangeHelper( final MultiMapChangeHandler.ChangeSet<Value, T> changeSet,
final Matcher matcher ) {
addedSelector = new Select<T>( changeSet.getAdded(),
matcher );
removedSelector = new Select<T>( changeSet.getRemoved(),
matcher );
}
boolean firstChanged( final Select.Entry first ) {
if ( containsEntry( removedSelector,
first ) ) {
return true;
} else if ( addedSelector.exists() ) {
return first.getKey().compareTo( addedSelector.firstEntry().getKey() ) > 0;
} else {
return false;
}
}
private boolean containsEntry( final Select<T> select,
final Select.Entry entry ) {
return select.asMap().keySet().contains( entry.getKey() ) && select.all().contains( entry.getValue() );
}
boolean lastChanged( final Select.Entry last ) {
if ( containsEntry( removedSelector,
last ) ) {
return true;
} else if ( addedSelector.exists() ) {
return last.getKey().compareTo( addedSelector.lastEntry().getKey() ) < 0;
} else {
return false;
}
}
}