1 files changed, 114 insertions, 0 deletions
diff --git a/services/core/java/com/android/server/location/GeofenceState.java b/services/core/java/com/android/server/location/GeofenceState.java
new file mode 100644
index 0000000..3ebe20a
--- /dev/null
+++ b/services/core/java/com/android/server/location/GeofenceState.java
@@ -0,0 +1,114 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed 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 com.android.server.location;
+
+import android.app.PendingIntent;
+import android.location.Geofence;
+import android.location.Location;
+
+/**
+ * Represents state associated with a geofence
+ */
+public class GeofenceState {
+    public final static int FLAG_ENTER = 0x01;
+    public final static int FLAG_EXIT = 0x02;
+
+    private static final int STATE_UNKNOWN = 0;
+    private static final int STATE_INSIDE = 1;
+    private static final int STATE_OUTSIDE = 2;
+
+    public final Geofence mFence;
+    private final Location mLocation;
+    public final long mExpireAt;
+    public final int mAllowedResolutionLevel;
+    public final int mUid;
+    public final String mPackageName;
+    public final PendingIntent mIntent;
+
+    int mState;  // current state
+    double mDistanceToCenter;  // current distance to center of fence
+
+    public GeofenceState(Geofence fence, long expireAt,
+            int allowedResolutionLevel, int uid, String packageName, PendingIntent intent) {
+        mState = STATE_UNKNOWN;
+        mDistanceToCenter = Double.MAX_VALUE;
+
+        mFence = fence;
+        mExpireAt = expireAt;
+        mAllowedResolutionLevel = allowedResolutionLevel;
+        mUid = uid;
+        mPackageName = packageName;
+        mIntent = intent;
+
+        mLocation = new Location("");
+        mLocation.setLatitude(fence.getLatitude());
+        mLocation.setLongitude(fence.getLongitude());
+    }
+
+    /**
+     * Process a new location.
+     * @return FLAG_ENTER or FLAG_EXIT if the fence was crossed, 0 otherwise
+     */
+    public int processLocation(Location location) {
+        mDistanceToCenter = mLocation.distanceTo(location);
+
+        int prevState = mState;
+        //TODO: inside/outside detection could be made more rigorous
+        boolean inside = mDistanceToCenter <= Math.max(mFence.getRadius(), location.getAccuracy());
+        if (inside) {
+            mState = STATE_INSIDE;
+            if (prevState != STATE_INSIDE) {
+                return FLAG_ENTER; // return enter if previously exited or unknown
+            }
+        } else {
+            mState = STATE_OUTSIDE;
+            if (prevState == STATE_INSIDE) {
+                return FLAG_EXIT; // return exit only if previously entered
+            }
+        }
+        return 0;
+    }
+
+    /**
+     * Gets the distance from the current location to the fence's boundary.
+     * @return The distance or {@link Double#MAX_VALUE} if unknown.
+     */
+    public double getDistanceToBoundary() {
+        if (Double.compare(mDistanceToCenter, Double.MAX_VALUE) == 0) {
+            return Double.MAX_VALUE;
+        } else {
+            return Math.abs(mFence.getRadius() - mDistanceToCenter);
+        }
+    }
+
+    @Override
+    public String toString() {
+        String state;
+        switch (mState) {
+            case STATE_INSIDE:
+                state = "IN";
+                break;
+            case STATE_OUTSIDE:
+                state = "OUT";
+                break;
+            default:
+                state = "?";
+        }
+        return String.format("%s d=%.0f %s", mFence.toString(), mDistanceToCenter, state);
+    }
+}