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/*
* Copyright (C) 2012 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 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 decoding chain that starts with an event and ends up with
* a stream of code points + decoding state.
*/
public class EventInterpreter {
// TODO: Implement an object pool for events, as we'll create a lot of them
// TODO: Create a combiner
// TODO: Create an object type to represent input material + visual feedback + decoding state
private final EventDecoderSpec mDecoderSpec;
private final ArrayList<Combiner> mCombiners;
/**
* Create an event interpreter according to a specification.
*
* The specification contains information about what to do with events. Typically, it will
* contain information about the type of keyboards - for example, if hardware keyboard(s) is/are
* attached, their type will be included here so that the decoder knows what to do with each
* keypress (a 10-key keyboard is not handled like a qwerty-ish keyboard).
* It also contains information for combining characters. For example, if the input language
* is Japanese, the specification will typically request kana conversion.
* Also note that the specification can be null. This means that we need to create a default
* interpreter that does no specific combining, and assumes the most common cases.
*
* @param specification the specification for event interpretation. null for default.
*/
public EventInterpreter(final EventDecoderSpec specification) {
mDecoderSpec = null != specification ? specification : new EventDecoderSpec();
mCombiners = CollectionUtils.newArrayList();
mCombiners.add(new DeadKeyCombiner());
}
}
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