org.eclipse.aether.util.graph.selector.AndDependencySelector Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of spring-cloud-contract-shade Show documentation
Show all versions of spring-cloud-contract-shade Show documentation
Spring Cloud Contract Shaded Dependencies
/*
* 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.eclipse.aether.util.graph.selector;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.Set;
import org.eclipse.aether.collection.DependencyCollectionContext;
import org.eclipse.aether.collection.DependencySelector;
import org.eclipse.aether.graph.Dependency;
import static java.util.Objects.requireNonNull;
/**
* A dependency selector that combines zero or more other selectors using a logical {@code AND}. The resulting selector
* selects a given dependency if and only if all constituent selectors do so.
*/
public final class AndDependencySelector implements DependencySelector {
private final Set selectors;
private int hashCode;
/**
* Creates a new selector from the specified selectors. Prefer
* {@link #newInstance(DependencySelector, DependencySelector)} if any of the input selectors might be {@code null}.
*
* @param selectors The selectors to combine, may be {@code null} but must not contain {@code null} elements.
*/
public AndDependencySelector(DependencySelector... selectors) {
if (selectors != null && selectors.length > 0) {
this.selectors = new LinkedHashSet<>(Arrays.asList(selectors));
} else {
this.selectors = Collections.emptySet();
}
}
/**
* Creates a new selector from the specified selectors.
*
* @param selectors The selectors to combine, may be {@code null} but must not contain {@code null} elements.
*/
public AndDependencySelector(Collection selectors) {
if (selectors != null && !selectors.isEmpty()) {
this.selectors = new LinkedHashSet<>(selectors);
} else {
this.selectors = Collections.emptySet();
}
}
private AndDependencySelector(Set selectors) {
if (selectors != null && !selectors.isEmpty()) {
this.selectors = selectors;
} else {
this.selectors = Collections.emptySet();
}
}
/**
* Creates a new selector from the specified selectors.
*
* @param selector1 The first selector to combine, may be {@code null}.
* @param selector2 The second selector to combine, may be {@code null}.
* @return The combined selector or {@code null} if both selectors were {@code null}.
*/
public static DependencySelector newInstance(DependencySelector selector1, DependencySelector selector2) {
if (selector1 == null) {
return selector2;
} else if (selector2 == null || selector2.equals(selector1)) {
return selector1;
}
return new AndDependencySelector(selector1, selector2);
}
public boolean selectDependency(Dependency dependency) {
requireNonNull(dependency, "dependency cannot be null");
for (DependencySelector selector : selectors) {
if (!selector.selectDependency(dependency)) {
return false;
}
}
return true;
}
public DependencySelector deriveChildSelector(DependencyCollectionContext context) {
requireNonNull(context, "context cannot be null");
int seen = 0;
Set childSelectors = null;
for (DependencySelector selector : selectors) {
DependencySelector childSelector = selector.deriveChildSelector(context);
if (childSelectors != null) {
if (childSelector != null) {
childSelectors.add(childSelector);
}
} else if (selector != childSelector) {
childSelectors = new LinkedHashSet<>();
if (seen > 0) {
for (DependencySelector s : selectors) {
if (childSelectors.size() >= seen) {
break;
}
childSelectors.add(s);
}
}
if (childSelector != null) {
childSelectors.add(childSelector);
}
} else {
seen++;
}
}
if (childSelectors == null) {
return this;
}
if (childSelectors.size() <= 1) {
if (childSelectors.isEmpty()) {
return null;
}
return childSelectors.iterator().next();
}
return new AndDependencySelector(childSelectors);
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
} else if (null == obj || !getClass().equals(obj.getClass())) {
return false;
}
AndDependencySelector that = (AndDependencySelector) obj;
return selectors.equals(that.selectors);
}
@Override
public int hashCode() {
if (hashCode == 0) {
int hash = 17;
hash = hash * 31 + selectors.hashCode();
hashCode = hash;
}
return hashCode;
}
@Override
public String toString() {
StringBuilder builder =
new StringBuilder().append(this.getClass().getSimpleName()).append('(');
Iterator iterator = this.selectors.iterator();
while (iterator.hasNext()) {
final DependencySelector selector = iterator.next();
builder.append(selector.toString());
if (iterator.hasNext()) // not last
{
builder.append(" && ");
}
}
return builder.append(')').toString();
}
}