1 files changed, 81 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/registry/connector/AbstractRegistrySourceConnector.java b/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/registry/connector/AbstractRegistrySourceConnector.java
new file mode 100644
index 00000000..0e2ef273
--- /dev/null
+++ b/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/registry/connector/AbstractRegistrySourceConnector.java
@@ -0,0 +1,81 @@
+/*******************************************************************************
+ * Copyright (c) 2010-2016, Abel Hegedus, IncQuery Labs Ltd.
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-v20.html.
+ * 
+ * SPDX-License-Identifier: EPL-2.0
+ *******************************************************************************/
+package tools.refinery.viatra.runtime.registry.connector;
+
+import java.util.HashSet;
+import java.util.Objects;
+import java.util.Set;
+
+import tools.refinery.viatra.runtime.registry.IConnectorListener;
+import tools.refinery.viatra.runtime.registry.IRegistrySourceConnector;
+
+/**
+ * Abstract registry source connector implementation that stores the identifier and listener set.
+ * 
+ * 
+ * @author Abel Hegedus
+ * @since 1.3
+ *
+ */
+public abstract class AbstractRegistrySourceConnector implements IRegistrySourceConnector {
+
+    protected Set<IConnectorListener> listeners;
+    private String identifier;
+    private boolean includeInDefaultViews;
+
+    /**
+     * Creates an instance of the connector with the given identifier. The identifier should be unique if you want to
+     * add it to a registry as a source.
+     * 
+     * @param identifier
+     *            of the newly created connector
+     * @param includeInDefaultViews
+     *            true if the specifications in the connector should be included in default views
+     */
+    public AbstractRegistrySourceConnector(String identifier, boolean includeInDefaultViews) {
+        super();
+        Objects.requireNonNull(identifier, "Identifier must not be null!");
+        this.identifier = identifier;
+        this.includeInDefaultViews = includeInDefaultViews;
+        this.listeners = new HashSet<>();
+    }
+
+    @Override
+    public String getIdentifier() {
+        return identifier;
+    }
+    
+    @Override
+    public boolean includeSpecificationsInDefaultViews() {
+        return includeInDefaultViews;
+    }
+
+    @Override
+    public void addListener(IConnectorListener listener) {
+        Objects.requireNonNull(listener, "Listener must not be null!");
+        boolean added = listeners.add(listener);
+        if (added) {
+            sendQuerySpecificationsToListener(listener);
+        }
+    }
+
+    @Override
+    public void removeListener(IConnectorListener listener) {
+        Objects.requireNonNull(listener, "Listener must not be null!");
+        listeners.remove(listener);
+    }
+
+    /**
+     * Subclasses should send add notifications for each specification in the connector to the given listener.
+     * 
+     * @param listener that should receive the notifications
+     */
+    protected abstract void sendQuerySpecificationsToListener(IConnectorListener listener);
+
+}
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