[MRESOLVER-330] Introduce file-static name mapper (s4u#258)

As static does not work with file-lock factory.

---

https://issues.apache.org/jira/browse/MRESOLVER-330

maven-resolver-impl/src/main/java/org/eclipse/aether/internal/impl/synccontext/named/NameMappers.java

@@ -34,6 +34,11 @@ public final class NameMappers {
 
     public static final String FILE_HGAV_NAME = "file-hgav";
 
+    /**
+     * @since 1.9.6
+     */
+    public static final String FILE_STATIC_NAME = "file-static";
+
     public static final String DISCRIMINATING_NAME = "discriminating";
 
     public static NameMapper staticNameMapper() {
@@ -48,6 +53,13 @@ public static NameMapper fileGavNameMapper() {
         return new BasedirNameMapper(GAVNameMapper.fileGav());
     }
 
+    /**
+     * @since 1.9.6
+     */
+    public static NameMapper fileStaticNameMapper() {
+        return new BasedirNameMapper(new StaticNameMapper());
+    }
+
     public static NameMapper fileHashingGavNameMapper() {
         return new BasedirNameMapper(new HashingNameMapper(GAVNameMapper.gav()));
     }

maven-resolver-impl/src/main/java/org/eclipse/aether/internal/impl/synccontext/named/providers/FileStaticNameMapperProvider.java

@@ -0,0 +1,46 @@
+/*
+ * 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.internal.impl.synccontext.named.providers;
+
+import javax.inject.Named;
+import javax.inject.Provider;
+import javax.inject.Singleton;
+
+import org.eclipse.aether.internal.impl.synccontext.named.NameMapper;
+import org.eclipse.aether.internal.impl.synccontext.named.NameMappers;
+
+/**
+ * The "file-static" name mapper provider.
+ *
+ * @since 1.9.6
+ */
+@Singleton
+@Named(NameMappers.FILE_STATIC_NAME)
+public class FileStaticNameMapperProvider implements Provider<NameMapper> {
+    private final NameMapper mapper;
+
+    public FileStaticNameMapperProvider() {
+        this.mapper = NameMappers.fileStaticNameMapper();
+    }
+
+    @Override
+    public NameMapper get() {
+        return mapper;
+    }
+}

maven-resolver-impl/src/site/markdown/synccontextfactory.md.vm

@@ -66,7 +66,8 @@ For the `aether.syncContext.named.nameMapper` property following values are allo
 - `file-gav` uses GAV and session to create absolute file paths (to be used with `file-lock` factory)
 - `file-hgav` uses more compact layout than `file-gav` by SHA-1 digest, similar to git (to be used with `file-lock` factory)
 - `static` uses static (same) string as lock name for any input. Effectively providing functionality same as old
-  "global" locking SyncContextFactory.
+  "global" locking SyncContextFactory. Mostly for testing/experimental purposes.
+- `file-static` same as `static` but to be used with `file-lock` factory. Mostly for testing/experimental purposes.
 
 Extra values for factory (these need extra setup and will work with Sisu DI only):