fix #4746: getUrl cannot be called on unknown trackables

5 files changed, 37 insertions, 5 deletions

diff --git a/main/src/cgeo/geocaching/Trackable.java b/main/src/cgeo/geocaching/Trackable.java
index d7d2357..6ec8c0d 100644
--- a/main/src/cgeo/geocaching/Trackable.java
+++ b/main/src/cgeo/geocaching/Trackable.java
@@ -42,6 +42,13 @@ public class Trackable implements ILogable {
     private List<LogEntry> logs = new ArrayList<>();
     private String trackingcode = null;
 
+    /**
+     * Check whether this trackable has a corresponding URL.
+     */
+    public boolean hasUrl() {
+        return getConnector().hasTrackableUrls();
+    }
+
     @NonNull
     public String getUrl() {
         return getConnector().getUrl(this);
diff --git a/main/src/cgeo/geocaching/TrackableActivity.java b/main/src/cgeo/geocaching/TrackableActivity.java
index e04fe9f..7d0ba3a 100644
--- a/main/src/cgeo/geocaching/TrackableActivity.java
+++ b/main/src/cgeo/geocaching/TrackableActivity.java
@@ -211,7 +211,7 @@ public class TrackableActivity extends AbstractViewPagerActivity<TrackableActivi
     public boolean onPrepareOptionsMenu(final Menu menu) {
         if (trackable != null) {
             menu.findItem(R.id.menu_log_touch).setVisible(StringUtils.isNotBlank(geocode) && trackable.isLoggable());
-            menu.findItem(R.id.menu_browser_trackable).setVisible(StringUtils.isNotBlank(trackable.getUrl()));
+            menu.findItem(R.id.menu_browser_trackable).setVisible(trackable.hasUrl());
         }
         return super.onPrepareOptionsMenu(menu);
     }
diff --git a/main/src/cgeo/geocaching/connector/trackable/AbstractTrackableConnector.java b/main/src/cgeo/geocaching/connector/trackable/AbstractTrackableConnector.java
index c3a7437..03549d1 100644
--- a/main/src/cgeo/geocaching/connector/trackable/AbstractTrackableConnector.java
+++ b/main/src/cgeo/geocaching/connector/trackable/AbstractTrackableConnector.java
@@ -1,5 +1,6 @@
 package cgeo.geocaching.connector.trackable;
 
+import cgeo.geocaching.Trackable;
 import cgeo.geocaching.connector.AbstractConnector;
 import cgeo.geocaching.connector.UserAction;
 
@@ -16,6 +17,11 @@ public abstract class AbstractTrackableConnector implements TrackableConnector {
     }
 
     @Override
+    public boolean hasTrackableUrls() {
+        return true;
+    }
+
+    @Override
     @Nullable
     public String getTrackableCodeFromUrl(@NonNull final String url) {
         return null;
@@ -26,4 +32,10 @@ public abstract class AbstractTrackableConnector implements TrackableConnector {
     public List<UserAction> getUserActions() {
         return AbstractConnector.getDefaultUserActions();
     }
+
+    @Override
+    @NonNull
+    public String getUrl(@NonNull final Trackable trackable) {
+        throw new IllegalStateException("this trackable does not have a corresponding URL");
+    }
 }
diff --git a/main/src/cgeo/geocaching/connector/trackable/TrackableConnector.java b/main/src/cgeo/geocaching/connector/trackable/TrackableConnector.java
index 1281683..aea60e6 100644
--- a/main/src/cgeo/geocaching/connector/trackable/TrackableConnector.java
+++ b/main/src/cgeo/geocaching/connector/trackable/TrackableConnector.java
@@ -16,6 +16,21 @@ public interface TrackableConnector {
 
     public boolean canHandleTrackable(final String geocode);
 
+    /**
+     * Check whether the connector has URLs corresponding the the trackable.
+     *
+     * @return <tt>true</tt> if the connector handles URLs, <tt>false</tt> otherwise
+     */
+    public boolean hasTrackableUrls();
+
+    /**
+     * Return the URL for a trackable. Might throw {@link IllegalStateException} if called
+     * on a connector which does not have URLs for trackables. This might be checked using
+     * {@link #hasTrackableUrls()}.
+     *
+     * @param trackable the trackable
+     * @return the URL corresponding to this trackable
+     */
     @NonNull
     public String getUrl(@NonNull final Trackable trackable);
 
diff --git a/main/src/cgeo/geocaching/connector/trackable/UnknownTrackableConnector.java b/main/src/cgeo/geocaching/connector/trackable/UnknownTrackableConnector.java
index 5fc7bf1..885df7e 100644
--- a/main/src/cgeo/geocaching/connector/trackable/UnknownTrackableConnector.java
+++ b/main/src/cgeo/geocaching/connector/trackable/UnknownTrackableConnector.java
@@ -2,7 +2,6 @@ package cgeo.geocaching.connector.trackable;
 
 import cgeo.geocaching.Trackable;
 
-import org.eclipse.jdt.annotation.NonNull;
 import org.eclipse.jdt.annotation.Nullable;
 
 public class UnknownTrackableConnector extends AbstractTrackableConnector {
@@ -13,9 +12,8 @@ public class UnknownTrackableConnector extends AbstractTrackableConnector {
     }
 
     @Override
-    @NonNull
-    public String getUrl(@NonNull final Trackable trackable) {
-        throw new IllegalStateException("getUrl cannot be called on unknown trackables");
+    public boolean hasTrackableUrls() {
+        return false;
     }
 
     @Override