From d15f2b68ab8f05e20712252eae93561b8036642c Mon Sep 17 00:00:00 2001
From: Eric Kuck <eric@bluelinelabs.com>
Date: Fri, 16 Dec 2016 11:35:45 -0600
Subject: [PATCH] Added missing files from
 e7c195d9105d457abe3a9bba0cc7f525230233a5

---
 .../conductor/ControllerChangeHandler.java        | 15 ++++++++++++---
 .../changehandler/SimpleSwapChangeHandler.java    |  4 ++++
 .../internal/NoOpControllerChangeHandler.java     |  5 +++++
 .../bluelinelabs/conductor/MockChangeHandler.java | 12 +++++++++++-
 4 files changed, 32 insertions(+), 4 deletions(-)

diff --git a/conductor/src/main/java/com/bluelinelabs/conductor/ControllerChangeHandler.java b/conductor/src/main/java/com/bluelinelabs/conductor/ControllerChangeHandler.java
index c8538452..a30b40cb 100644
--- a/conductor/src/main/java/com/bluelinelabs/conductor/ControllerChangeHandler.java
+++ b/conductor/src/main/java/com/bluelinelabs/conductor/ControllerChangeHandler.java
@@ -28,8 +28,7 @@ public abstract class ControllerChangeHandler {
     private static final Map<String, ControllerChangeHandler> inProgressPushHandlers = new HashMap<>();
 
     private boolean forceRemoveViewOnPush;
-
-    boolean hasBeenUsed;
+    private boolean hasBeenUsed;
 
     /**
      * Responsible for swapping Views from one Controller to another.
@@ -85,6 +84,16 @@ public ControllerChangeHandler copy() {
         return fromBundle(toBundle());
     }
 
+    /**
+     * Returns whether or not this is a reusable ControllerChangeHandler. Defaults to false and should
+     * ONLY be overridden if there are absolutely no side effects to using this handler more than once.
+     * In the case that a handler is not reusable, it will be copied using the {@link #copy()} method
+     * prior to use.
+     */
+    public boolean isReusable() {
+        return false;
+    }
+
     @NonNull
     final Bundle toBundle() {
         Bundle bundle = new Bundle();
@@ -145,7 +154,7 @@ public static void executeChange(@Nullable final Controller to, @Nullable final
             final ControllerChangeHandler handler;
             if (inHandler == null) {
                 handler = new SimpleSwapChangeHandler();
-            } else if (inHandler.hasBeenUsed) {
+            } else if (inHandler.hasBeenUsed && !inHandler.isReusable()) {
                 handler = inHandler.copy();
             } else {
                 handler = inHandler;
diff --git a/conductor/src/main/java/com/bluelinelabs/conductor/changehandler/SimpleSwapChangeHandler.java b/conductor/src/main/java/com/bluelinelabs/conductor/changehandler/SimpleSwapChangeHandler.java
index 7a27f1d9..5d845511 100755
--- a/conductor/src/main/java/com/bluelinelabs/conductor/changehandler/SimpleSwapChangeHandler.java
+++ b/conductor/src/main/java/com/bluelinelabs/conductor/changehandler/SimpleSwapChangeHandler.java
@@ -108,4 +108,8 @@ public ControllerChangeHandler copy() {
         return new SimpleSwapChangeHandler(removesFromViewOnPush());
     }
 
+    @Override
+    public boolean isReusable() {
+        return true;
+    }
 }
diff --git a/conductor/src/main/java/com/bluelinelabs/conductor/internal/NoOpControllerChangeHandler.java b/conductor/src/main/java/com/bluelinelabs/conductor/internal/NoOpControllerChangeHandler.java
index b429ac6c..838174f1 100644
--- a/conductor/src/main/java/com/bluelinelabs/conductor/internal/NoOpControllerChangeHandler.java
+++ b/conductor/src/main/java/com/bluelinelabs/conductor/internal/NoOpControllerChangeHandler.java
@@ -19,4 +19,9 @@ public void performChange(@NonNull ViewGroup container, @Nullable View from, @Nu
     public ControllerChangeHandler copy() {
         return new NoOpControllerChangeHandler();
     }
+
+    @Override
+    public boolean isReusable() {
+        return true;
+    }
 }
\ No newline at end of file
diff --git a/conductor/src/test/java/com/bluelinelabs/conductor/MockChangeHandler.java b/conductor/src/test/java/com/bluelinelabs/conductor/MockChangeHandler.java
index 703bf7e5..2e652abd 100644
--- a/conductor/src/test/java/com/bluelinelabs/conductor/MockChangeHandler.java
+++ b/conductor/src/test/java/com/bluelinelabs/conductor/MockChangeHandler.java
@@ -1,6 +1,5 @@
 package com.bluelinelabs.conductor;
 
-
 import android.os.Bundle;
 import android.support.annotation.NonNull;
 import android.view.View;
@@ -82,4 +81,15 @@ public void restoreFromBundle(@NonNull Bundle bundle) {
         super.restoreFromBundle(bundle);
         removesFromViewOnPush = bundle.getBoolean(KEY_REMOVES_FROM_VIEW_ON_PUSH);
     }
+
+    @NonNull
+    @Override
+    public ControllerChangeHandler copy() {
+        return new MockChangeHandler(removesFromViewOnPush, listener);
+    }
+
+    @Override
+    public boolean isReusable() {
+        return true;
+    }
 }