/
DefaultTransformerContext.java
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/
DefaultTransformerContext.java
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/*
* 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.model.building;
import java.io.File;
import java.nio.file.Path;
import java.util.Map;
import java.util.Objects;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Supplier;
import org.apache.maven.model.Model;
import org.apache.maven.model.locator.ModelLocator;
/**
*
* @since 4.0.0
*/
class DefaultTransformerContext implements TransformerContext {
final ModelLocator modelLocator;
final Map<String, String> userProperties = new ConcurrentHashMap<>();
final Map<Path, Holder> modelByPath = new ConcurrentHashMap<>();
final Map<GAKey, Holder> modelByGA = new ConcurrentHashMap<>();
public static class Holder {
private volatile boolean set;
private volatile Model model;
Holder() {}
Holder(Model model) {
this.model = Objects.requireNonNull(model);
this.set = true;
}
public static Model deref(Holder holder) {
return holder != null ? holder.get() : null;
}
public Model get() {
if (!set) {
synchronized (this) {
if (!set) {
try {
this.wait();
} catch (InterruptedException e) {
// Ignore
}
}
}
}
return model;
}
public Model computeIfAbsent(Supplier<Model> supplier) {
if (!set) {
synchronized (this) {
if (!set) {
this.set = true;
this.model = supplier.get();
this.notifyAll();
}
}
}
return model;
}
}
DefaultTransformerContext(ModelLocator modelLocator) {
this.modelLocator = modelLocator;
}
@Override
public String getUserProperty(String key) {
return userProperties.get(key);
}
@Override
public Model getRawModel(Path from, Path p) {
return Holder.deref(modelByPath.get(p));
}
@Override
public Model getRawModel(Path from, String groupId, String artifactId) {
return Holder.deref(modelByGA.get(new GAKey(groupId, artifactId)));
}
@Override
public Path locate(Path path) {
File file = modelLocator.locateExistingPom(path.toFile());
return file != null ? file.toPath() : null;
}
static class GAKey {
private final String groupId;
private final String artifactId;
private final int hashCode;
GAKey(String groupId, String artifactId) {
this.groupId = groupId;
this.artifactId = artifactId;
this.hashCode = Objects.hash(groupId, artifactId);
}
@Override
public int hashCode() {
return hashCode;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (!(obj instanceof GAKey)) {
return false;
}
GAKey other = (GAKey) obj;
return Objects.equals(artifactId, other.artifactId) && Objects.equals(groupId, other.groupId);
}
}
}