[IL121] Introduce InputTransaction

We probably can't put this off any longer

Bug: 8636060
Change-Id: I1e5d3cf62d719f4d064ced3282bebf2e822f6baa

1 files changed, 48 insertions, 0 deletions

diff --git a/java/src/com/android/inputmethod/event/InputTransaction.java b/java/src/com/android/inputmethod/event/InputTransaction.java
new file mode 100644
index 000000000..5e046a80e
--- /dev/null
+++ b/java/src/com/android/inputmethod/event/InputTransaction.java
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2014 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.inputmethod.event;
+
+/**
+ * An object encapsulating a single transaction for input.
+ */
+public class InputTransaction {
+    // UPDATE_LATER is stronger than UPDATE_NOW. The reason for this is, if we have to update later,
+    // it's because something will change that we can't evaluate now, which means that even if we
+    // re-evaluate now we'll have to do it again later. The only case where that wouldn't apply
+    // would be if we needed to update now to find out the new state right away, but then we
+    // can't do it with this deferred mechanism anyway.
+    public static final int SHIFT_NO_UPDATE = 0;
+    public static final int SHIFT_UPDATE_NOW = 1;
+    public static final int SHIFT_UPDATE_LATER = 2;
+
+    // Initial conditions
+    public final int mShiftState;
+
+    // Outputs
+    private int mRequiredShiftUpdate = SHIFT_NO_UPDATE;
+
+    public InputTransaction(final int shiftState) {
+        mShiftState = shiftState;
+    }
+
+    public void requireShiftUpdate(final int updateType) {
+        mRequiredShiftUpdate = Math.max(mRequiredShiftUpdate, updateType);
+    }
+    public int getRequiredShiftUpdate() {
+        return mRequiredShiftUpdate;
+    }
+}