be.objectify.deadbolt.java.composite.ConstraintTree Maven / Gradle / Ivy
/*
* Copyright 2010-2017 Steve Chaloner
*
* 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 be.objectify.deadbolt.java.composite;
import be.objectify.deadbolt.java.DeadboltHandler;
import play.mvc.Http;
import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;
import java.util.Objects;
import java.util.Optional;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionStage;
import java.util.concurrent.Executor;
import java.util.function.BiFunction;
import java.util.stream.Collectors;
/**
* A list of constraints combined by {@link Operator}. Those constraints may themselves be trees.
*
* @author Steve Chaloner ([email protected])
*/
public class ConstraintTree implements Constraint
{
private final Operator operator;
private final List constraints = new LinkedList<>();
public ConstraintTree(final Operator operator,
final Constraint... constraints)
{
this.operator = operator;
Arrays.stream(constraints)
.filter(Objects::nonNull)
.collect(Collectors.toCollection(() -> this.constraints));
}
@Override
public CompletionStage test(final Http.Context context,
final DeadboltHandler handler,
final Executor executor,
final Optional globalMetaData,
final BiFunction, Optional, Optional> metaFn)
{
final CompletionStage result;
if (constraints.isEmpty())
{
result = CompletableFuture.completedFuture(false);
}
else
{
Constraint current = constraints.get(0);
for (int i = 1; i < constraints.size(); i++)
{
current = operator.apply(current,
constraints.get(i));
}
result = current.test(context,
handler,
executor,
globalMetaData,
metaFn);
}
return result;
}
}