[CB08] Create a combiner chain in the word composer.

Bug: 13406701
Change-Id: I3b9f75de9283f76366d1bef7e14a8f22f2186669

1 files changed, 54 insertions, 0 deletions

diff --git a/java/src/com/android/inputmethod/event/CombinerChain.java b/java/src/com/android/inputmethod/event/CombinerChain.java
new file mode 100644
index 000000000..1deaed68f
--- /dev/null
+++ b/java/src/com/android/inputmethod/event/CombinerChain.java
@@ -0,0 +1,54 @@
+/*
+ * 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;
+
+import com.android.inputmethod.latin.utils.CollectionUtils;
+
+import java.util.ArrayList;
+
+/**
+ * This class implements the logic chain between receiving events and generating code points.
+ *
+ * Event sources are multiple. It may be a hardware keyboard, a D-PAD, a software keyboard,
+ * or any exotic input source.
+ * This class will orchestrate the composing chain that starts with an event as its input. Each
+ * composer will be given turns one after the other.
+ * The output is composed of two sequences of code points: the first, representing the already
+ * finished combining part, will be shown normally as the composing string, while the second is
+ * feedback on the composing state and will typically be shown with different styling such as
+ * a colored background.
+ */
+public class CombinerChain {
+    // TODO: Create an object type to represent input material + visual feedback + decoding state
+
+    private final ArrayList<Combiner> mCombiners;
+
+    /**
+     * Create an combiner chain.
+     *
+     * The combiner chain takes events as inputs and outputs code points and combining state.
+     * For example, if the input language is Japanese, the combining chain will typically perform
+     * kana conversion.
+     *
+     * @param combinerList A list of combiners to be applied in order.
+     */
+    public CombinerChain(final Combiner... combinerList) {
+        mCombiners = CollectionUtils.newArrayList();
+        // The dead key combiner is always active, and always first
+        mCombiners.add(new DeadKeyCombiner());
+    }
+}