1 files changed, 105 insertions, 0 deletions
diff --git a/InCallUI/src/com/android/incallui/ExternalCallList.java b/InCallUI/src/com/android/incallui/ExternalCallList.java
new file mode 100644
index 000000000..06e0bb975
--- /dev/null
+++ b/InCallUI/src/com/android/incallui/ExternalCallList.java
@@ -0,0 +1,105 @@
+package com.android.incallui;
+
+import com.google.common.base.Preconditions;
+
+import com.android.contacts.common.compat.CallSdkCompat;
+
+import android.os.Handler;
+import android.os.Looper;
+import android.telecom.Call;
+import android.util.ArraySet;
+
+import java.util.Collections;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+
+/**
+ * Tracks the external calls known to the InCall UI.
+ *
+ * External calls are those with {@link android.telecom.Call.Details#PROPERTY_IS_EXTERNAL_CALL}.
+ */
+public class ExternalCallList {
+
+    public interface ExternalCallListener {
+        void onExternalCallAdded(Call call);
+        void onExternalCallRemoved(Call call);
+        void onExternalCallUpdated(Call call);
+    }
+
+    /**
+     * Handles {@link android.telecom.Call.Callback} callbacks.
+     */
+    private final Call.Callback mTelecomCallCallback = new Call.Callback() {
+        @Override
+        public void onDetailsChanged(Call call, Call.Details details) {
+            notifyExternalCallUpdated(call);
+        }
+    };
+
+    private final Set<Call> mExternalCalls = new ArraySet<>();
+    private final Set<ExternalCallListener> mExternalCallListeners = Collections.newSetFromMap(
+            new ConcurrentHashMap<ExternalCallListener, Boolean>(8, 0.9f, 1));
+
+    /**
+     * Begins tracking an external call and notifies listeners of the new call.
+     */
+    public void onCallAdded(Call telecomCall) {
+        Preconditions.checkArgument(telecomCall.getDetails()
+                .hasProperty(CallSdkCompat.Details.PROPERTY_IS_EXTERNAL_CALL));
+        mExternalCalls.add(telecomCall);
+        telecomCall.registerCallback(mTelecomCallCallback, new Handler(Looper.getMainLooper()));
+        notifyExternalCallAdded(telecomCall);
+    }
+
+    /**
+     * Stops tracking an external call and notifies listeners of the removal of the call.
+     */
+    public void onCallRemoved(Call telecomCall) {
+        Preconditions.checkArgument(mExternalCalls.contains(telecomCall));
+        mExternalCalls.remove(telecomCall);
+        telecomCall.unregisterCallback(mTelecomCallCallback);
+        notifyExternalCallRemoved(telecomCall);
+    }
+
+    /**
+     * Adds a new listener to external call events.
+     */
+    public void addExternalCallListener(ExternalCallListener listener) {
+        mExternalCallListeners.add(Preconditions.checkNotNull(listener));
+    }
+
+    /**
+     * Removes a listener to external call events.
+     */
+    public void removeExternalCallListener(ExternalCallListener listener) {
+        Preconditions.checkArgument(mExternalCallListeners.contains(listener));
+        mExternalCallListeners.remove(Preconditions.checkNotNull(listener));
+    }
+
+    /**
+     * Notifies listeners of the addition of a new external call.
+     */
+    private void notifyExternalCallAdded(Call call) {
+        for (ExternalCallListener listener : mExternalCallListeners) {
+            listener.onExternalCallAdded(call);
+        }
+    }
+
+    /**
+     * Notifies listeners of the removal of an external call.
+     */
+    private void notifyExternalCallRemoved(Call call) {
+        for (ExternalCallListener listener : mExternalCallListeners) {
+            listener.onExternalCallRemoved(call);
+        }
+    }
+
+    /**
+     * Notifies listeners of changes to an external call.
+     */
+    private void notifyExternalCallUpdated(Call call) {
+        for (ExternalCallListener listener : mExternalCallListeners) {
+            listener.onExternalCallUpdated(call);
+        }
+    }
+}