BindingInitializer.java
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.maven.di.impl;
import java.util.Collection;
import java.util.List;
import java.util.Set;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.Supplier;
import static java.util.stream.Collectors.toSet;
public abstract class BindingInitializer<T> {
private final Set<Dependency<?>> dependencies;
protected BindingInitializer(Set<Dependency<?>> dependencies) {
this.dependencies = dependencies;
}
public Set<Dependency<?>> getDependencies() {
return dependencies;
}
public abstract Consumer<T> compile(Function<Dependency<?>, Supplier<?>> compiler);
public static <T> BindingInitializer<T> combine(List<BindingInitializer<T>> bindingInitializers) {
Set<Dependency<?>> deps = bindingInitializers.stream()
.map(BindingInitializer::getDependencies)
.flatMap(Collection::stream)
.collect(toSet());
return new BindingInitializer<>(deps) {
@Override
public Consumer<T> compile(Function<Dependency<?>, Supplier<?>> compiler) {
return instance -> bindingInitializers.stream()
.map(bindingInitializer -> bindingInitializer.compile(compiler))
.forEach(i -> i.accept(instance));
}
};
}
}