1 files changed, 169 insertions, 0 deletions
diff --git a/framework/src/maven/apache-maven-3.3.3/maven-core/src/main/java/org/apache/maven/session/scope/internal/SessionScope.java b/framework/src/maven/apache-maven-3.3.3/maven-core/src/main/java/org/apache/maven/session/scope/internal/SessionScope.java
new file mode 100644
index 00000000..6d8913f5
--- /dev/null
+++ b/framework/src/maven/apache-maven-3.3.3/maven-core/src/main/java/org/apache/maven/session/scope/internal/SessionScope.java
@@ -0,0 +1,169 @@
+package org.apache.maven.session.scope.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.util.Collections;
+import java.util.LinkedList;
+import java.util.Map;
+
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.Maps;
+import com.google.inject.Key;
+import com.google.inject.OutOfScopeException;
+import com.google.inject.Provider;
+import com.google.inject.Scope;
+import com.google.inject.util.Providers;
+
+public class SessionScope
+    implements Scope
+{
+    /**
+     * @since 3.3.0
+     */
+    public static class Memento
+    {
+        final Map<Key<?>, Provider<?>> seeded;
+
+        Memento( final Map<Key<?>, Provider<?>> seeded )
+        {
+            this.seeded = ImmutableMap.copyOf( seeded );
+        }
+    }
+
+    private static final Provider<Object> SEEDED_KEY_PROVIDER = new Provider<Object>()
+    {
+        public Object get()
+        {
+            throw new IllegalStateException();
+        }
+    };
+
+    private static final class ScopeState
+    {
+        public final Map<Key<?>, Provider<?>> seeded = Maps.newHashMap();
+
+        public final Map<Key<?>, Object> provided = Maps.newHashMap();
+    }
+
+    private final ThreadLocal<LinkedList<ScopeState>> values = new ThreadLocal<LinkedList<ScopeState>>();
+
+    public void enter()
+    {
+        LinkedList<ScopeState> stack = values.get();
+        if ( stack == null )
+        {
+            stack = new LinkedList<ScopeState>();
+            values.set( stack );
+        }
+        stack.addFirst( new ScopeState() );
+    }
+
+    /**
+     * @since 3.3.0
+     */
+    public void enter( Memento memento )
+    {
+        enter();
+        getScopeState().seeded.putAll( memento.seeded );
+    }
+
+    private ScopeState getScopeState()
+    {
+        LinkedList<ScopeState> stack = values.get();
+        if ( stack == null || stack.isEmpty() )
+        {
+            throw new IllegalStateException();
+        }
+        return stack.getFirst();
+    }
+
+    public void exit()
+    {
+        final LinkedList<ScopeState> stack = values.get();
+        if ( stack == null || stack.isEmpty() )
+        {
+            throw new IllegalStateException();
+        }
+        stack.removeFirst();
+        if ( stack.isEmpty() )
+        {
+            values.remove();
+        }
+    }
+
+    /**
+     * @since 3.3.0
+     */
+    public Memento memento()
+    {
+        LinkedList<ScopeState> stack = values.get();
+        return new Memento( stack != null ? stack.getFirst().seeded : Collections.<Key<?>, Provider<?>>emptyMap() );
+    }
+
+    public <T> void seed( Class<T> clazz, Provider<T> value )
+    {
+        getScopeState().seeded.put( Key.get( clazz ), value );
+    }
+
+    public <T> void seed( Class<T> clazz, final T value )
+    {
+        getScopeState().seeded.put( Key.get( clazz ), Providers.of( value ) );
+    }
+
+    public <T> Provider<T> scope( final Key<T> key, final Provider<T> unscoped )
+    {
+        return new Provider<T>()
+        {
+            @SuppressWarnings( "unchecked" )
+            public T get()
+            {
+                LinkedList<ScopeState> stack = values.get();
+                if ( stack == null || stack.isEmpty() )
+                {
+                    throw new OutOfScopeException( "Cannot access " + key + " outside of a scoping block" );
+                }
+
+                ScopeState state = stack.getFirst();
+
+                Provider<?> seeded = state.seeded.get( key );
+
+                if ( seeded != null )
+                {
+                    return (T) seeded.get();
+                }
+
+                T provided = (T) state.provided.get( key );
+                if ( provided == null && unscoped != null )
+                {
+                    provided = unscoped.get();
+                    state.provided.put( key, provided );
+                }
+
+                return provided;
+            }
+        };
+    }
+
+    @SuppressWarnings( { "unchecked" } )
+    public static <T> Provider<T> seededKeyProvider()
+    {
+        return (Provider<T>) SEEDED_KEY_PROVIDER;
+    }
+}