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package org.apache.maven.extension.internal;
/*
* 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.
*/
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.Collection;
import java.util.Enumeration;
import java.util.LinkedHashSet;
import java.util.Set;
import org.apache.maven.project.ExtensionDescriptor;
import org.apache.maven.project.ExtensionDescriptorBuilder;
import org.codehaus.plexus.classworlds.realm.ClassRealm;
import org.codehaus.plexus.util.IOUtil;
import com.google.common.collect.ImmutableSet;
/**
* Provides information about artifacts (identified by groupId:artifactId string key) and classpath elements exported by
* Maven core itself or a Maven core extension.
*
* @since 3.3.0
*/
public class CoreExtensionEntry
{
private final ClassRealm realm;
private final Set<String> artifacts;
private final Set<String> packages;
public CoreExtensionEntry( ClassRealm realm, Collection<String> artifacts, Collection<String> packages )
{
this.realm = realm;
this.artifacts = ImmutableSet.copyOf( artifacts );
this.packages = ImmutableSet.copyOf( packages );
}
/**
* Returns ClassLoader used to load extension classes.
*/
public ClassRealm getClassRealm()
{
return realm;
}
/**
* Returns artifacts exported by the extension, identified by groupId:artifactId string key.
*/
public Set<String> getExportedArtifacts()
{
return artifacts;
}
/**
* Returns classpath elements exported by the extension.
*/
public Set<String> getExportedPackages()
{
return packages;
}
private static final ExtensionDescriptorBuilder builder = new ExtensionDescriptorBuilder();
public static CoreExtensionEntry discoverFrom( ClassRealm loader )
{
Set<String> artifacts = new LinkedHashSet<String>();
Set<String> packages = new LinkedHashSet<String>();
try
{
Enumeration<URL> urls = loader.getResources( builder.getExtensionDescriptorLocation() );
while ( urls.hasMoreElements() )
{
InputStream is = urls.nextElement().openStream();
try
{
ExtensionDescriptor descriptor = builder.build( is );
artifacts.addAll( descriptor.getExportedArtifacts() );
packages.addAll( descriptor.getExportedPackages() );
}
finally
{
IOUtil.close( is );
}
}
}
catch ( IOException ignored )
{
// exports descriptors are entirely optional
}
return new CoreExtensionEntry( loader, artifacts, packages );
}
public static CoreExtensionEntry discoverFrom( ClassRealm loader, Collection<File> classpath )
{
Set<String> artifacts = new LinkedHashSet<String>();
Set<String> packages = new LinkedHashSet<String>();
try
{
for ( File entry : classpath )
{
ExtensionDescriptor descriptor = builder.build( entry );
if ( descriptor != null )
{
artifacts.addAll( descriptor.getExportedArtifacts() );
packages.addAll( descriptor.getExportedPackages() );
}
}
}
catch ( IOException ignored )
{
// exports descriptors are entirely optional
}
return new CoreExtensionEntry( loader, artifacts, packages );
}
}
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