org.springframework.boot.loader.tools.layer.CustomLayers Maven / Gradle / Ivy
/*
* Copyright 2012-2020 the original author or authors.
*
* 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
*
* https://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.springframework.boot.loader.tools.layer;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.function.Supplier;
import java.util.stream.Stream;
import org.springframework.boot.loader.tools.Layer;
import org.springframework.boot.loader.tools.Layers;
import org.springframework.boot.loader.tools.Library;
import org.springframework.util.Assert;
/**
* Custom {@link Layers} implementation where layer content is selected by the user.
*
* @author Madhura Bhave
* @author Phillip Webb
* @since 2.3.0
*/
public class CustomLayers implements Layers {
private final List layers;
private final List> applicationSelectors;
private final List> librarySelectors;
public CustomLayers(List layers, List> applicationSelectors,
List> librarySelectors) {
Assert.notNull(layers, "Layers must not be null");
Assert.notNull(applicationSelectors, "ApplicationSelectors must not be null");
validateSelectorLayers(applicationSelectors, layers);
Assert.notNull(librarySelectors, "LibrarySelectors must not be null");
validateSelectorLayers(librarySelectors, layers);
this.layers = new ArrayList<>(layers);
this.applicationSelectors = new ArrayList<>(applicationSelectors);
this.librarySelectors = new ArrayList<>(librarySelectors);
}
private static void validateSelectorLayers(List> selectors, List layers) {
for (ContentSelector selector : selectors) {
validateSelectorLayers(selector, layers);
}
}
private static void validateSelectorLayers(ContentSelector selector, List layers) {
Layer layer = selector.getLayer();
Assert.state(layer != null, "Missing content selector layer");
Assert.state(layers.contains(layer),
() -> "Content selector layer '" + selector.getLayer() + "' not found in " + layers);
}
@Override
public Iterator iterator() {
return this.layers.iterator();
}
@Override
public Stream stream() {
return this.layers.stream();
}
@Override
public Layer getLayer(String resourceName) {
return selectLayer(resourceName, this.applicationSelectors, () -> "Resource '" + resourceName + "'");
}
@Override
public Layer getLayer(Library library) {
return selectLayer(library, this.librarySelectors, () -> "Library '" + library.getName() + "'");
}
private Layer selectLayer(T item, List> selectors, Supplier name) {
for (ContentSelector selector : selectors) {
if (selector.contains(item)) {
return selector.getLayer();
}
}
throw new IllegalStateException(name.get() + " did not match any layer");
}
}