| /* |
| * Copyright (C) 2016 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 android.databinding.tool.expr; |
| |
| import android.databinding.tool.CallbackWrapper; |
| import android.databinding.tool.processing.ErrorMessages; |
| import android.databinding.tool.reflection.ModelAnalyzer; |
| import android.databinding.tool.reflection.ModelClass; |
| import android.databinding.tool.util.Preconditions; |
| import android.databinding.tool.writer.KCode; |
| |
| import java.util.Collections; |
| import java.util.List; |
| |
| /** |
| * This expressions that are used to reference arguments in callbacks. |
| * <p |
| * While the callback is being parsed, they get whatever the variable user defined in the lambda. |
| * When the code is being generated, they get simple enumarated names so that multiple callbacks |
| * can be handled in the same method. |
| */ |
| public class CallbackArgExpr extends IdentifierExpr { |
| |
| private int mArgIndex; |
| |
| private String mName; |
| |
| private ModelClass mClassFromCallback; |
| |
| public CallbackArgExpr(int argIndex, String name) { |
| super(name); |
| mArgIndex = argIndex; |
| mName = name; |
| } |
| |
| @Override |
| public boolean isDynamic() { |
| return false; |
| } |
| |
| public void setClassFromCallback(ModelClass modelClass) { |
| mClassFromCallback = modelClass; |
| } |
| |
| @Override |
| protected ModelClass resolveType(ModelAnalyzer modelAnalyzer) { |
| Preconditions |
| .checkNotNull(mClassFromCallback, ErrorMessages.UNDEFINED_CALLBACK_ARGUMENT, mName); |
| return mClassFromCallback; |
| } |
| |
| @Override |
| protected List<Dependency> constructDependencies() { |
| return Collections.emptyList(); |
| } |
| |
| @Override |
| protected KCode generateCode() { |
| return new KCode(CallbackWrapper.ARG_PREFIX + mArgIndex); |
| } |
| |
| @Override |
| protected String computeUniqueKey() { |
| return CallbackWrapper.ARG_PREFIX + mArgIndex; |
| } |
| |
| @Override |
| public String getInvertibleError() { |
| return "Callback arguments cannot be inverted"; |
| } |
| |
| public String getName() { |
| return mName; |
| } |
| |
| @Override |
| public Expr cloneToModel(ExprModel model) { |
| return new CallbackArgExpr(mArgIndex, mName); |
| } |
| } |