Create the path for specifying combining rules in the subtype

Also add the skeleton of the combining rules for Myanmar
reordering as a pilot.

Bug: 13945569
Change-Id: Iabeb6838f45f1efff482143595ce5b48543e0c43

2 files changed, 74 insertions, 0 deletions

diff --git a/java/src/com/android/inputmethod/event/CombinerChain.java b/java/src/com/android/inputmethod/event/CombinerChain.java
index 8b59dc52a..990f7deea 100644
--- a/java/src/com/android/inputmethod/event/CombinerChain.java
+++ b/java/src/com/android/inputmethod/event/CombinerChain.java
@@ -23,6 +23,7 @@ import com.android.inputmethod.latin.Constants;
 import com.android.inputmethod.latin.utils.CollectionUtils;
 
 import java.util.ArrayList;
+import java.util.HashMap;
 
 /**
  * This class implements the logic chain between receiving events and generating code points.
@@ -43,6 +44,13 @@ public class CombinerChain {
     private SpannableStringBuilder mStateFeedback;
     private final ArrayList<Combiner> mCombiners;
 
+    private static final HashMap<String, Class> IMPLEMENTED_COMBINERS
+            = new HashMap<String, Class>();
+    static {
+        IMPLEMENTED_COMBINERS.put("MyanmarReordering", MyanmarReordering.class);
+    }
+    private static final String COMBINER_SPEC_SEPARATOR = ";";
+
     /**
      * Create an combiner chain.
      *
@@ -56,6 +64,9 @@ public class CombinerChain {
         mCombiners = CollectionUtils.newArrayList();
         // The dead key combiner is always active, and always first
         mCombiners.add(new DeadKeyCombiner());
+        for (final Combiner combiner : combinerList) {
+            mCombiners.add(combiner);
+        }
         mCombinedText = new StringBuilder();
         mStateFeedback = new SpannableStringBuilder();
     }
@@ -114,4 +125,29 @@ public class CombinerChain {
         final SpannableStringBuilder s = new SpannableStringBuilder(mCombinedText);
         return s.append(mStateFeedback);
     }
+
+    public static Combiner[] createCombiners(final String spec) {
+        if (TextUtils.isEmpty(spec)) {
+            return new Combiner[0];
+        }
+        final String[] combinerDescriptors = spec.split(COMBINER_SPEC_SEPARATOR);
+        final Combiner[] combiners = new Combiner[combinerDescriptors.length];
+        int i = 0;
+        for (final String combinerDescriptor : combinerDescriptors) {
+            final Class combinerClass = IMPLEMENTED_COMBINERS.get(combinerDescriptor);
+            if (null == combinerClass) {
+                throw new RuntimeException("Unknown combiner descriptor: " + combinerDescriptor);
+            }
+            try {
+                combiners[i++] = (Combiner)combinerClass.newInstance();
+            } catch (InstantiationException e) {
+                throw new RuntimeException("Unable to instantiate combiner: " + combinerDescriptor,
+                        e);
+            } catch (IllegalAccessException e) {
+                throw new RuntimeException("Unable to instantiate combiner: " + combinerDescriptor,
+                        e);
+            }
+        }
+        return combiners;
+    }
 }
diff --git a/java/src/com/android/inputmethod/event/MyanmarReordering.java b/java/src/com/android/inputmethod/event/MyanmarReordering.java
new file mode 100644
index 000000000..0831b63ec
--- /dev/null
+++ b/java/src/com/android/inputmethod/event/MyanmarReordering.java
@@ -0,0 +1,38 @@
+/*
+ * 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 java.util.ArrayList;
+
+/**
+ * A combiner that reorders input for Myanmar.
+ */
+public class MyanmarReordering implements Combiner {
+    @Override
+    public Event processEvent(ArrayList<Event> previousEvents, Event event) {
+        return event;
+    }
+
+    @Override
+    public CharSequence getCombiningStateFeedback() {
+        return "";
+    }
+
+    @Override
+    public void reset() {
+    }
+}