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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package android.databinding.tool.writer
     18 
     19 import android.databinding.tool.CallbackWrapper
     20 
     21 fun CallbackWrapper.allArgsWithTypes() =
     22         "int ${CallbackWrapper.SOURCE_ID} ${method.parameterTypes.withIndex().map { ", ${it.value.toJavaCode()} ${CallbackWrapper.ARG_PREFIX}${it.index}" }.joinToString("")}"
     23 
     24 fun CallbackWrapper.argsWithTypes() =
     25         method.parameterTypes.withIndex().map { "${it.value.toJavaCode()} ${CallbackWrapper.ARG_PREFIX}${it.index}" }.joinToString(", ")
     26 
     27 fun CallbackWrapper.args() =
     28         method.parameterTypes.withIndex().map { "${CallbackWrapper.ARG_PREFIX}${it.index}" }.joinToString(", ")
     29 
     30 fun CallbackWrapper.allArgs() =
     31         "mSourceId ${method.parameterTypes.withIndex().map { ", ${CallbackWrapper.ARG_PREFIX}${it.index}" }.joinToString("")}"
     32 
     33 /**
     34  * For any listener type we see, we create a class that can wrap around it. This wrapper has an
     35  * interface which is implemented by the ViewDataBinding.
     36  */
     37 public class CallbackWrapperWriter(val wrapper: CallbackWrapper) {
     38 
     39     public fun write() = kcode("") {
     40         with(wrapper) {
     41             @Suppress("RemoveCurlyBracesFromTemplate")
     42             app("package ${`package`};")
     43             val extendsImplements = if (klass.isInterface) {
     44                 "implements"
     45             } else {
     46                 "extends"
     47             }
     48             block("public final class $className $extendsImplements ${klass.canonicalName}") {
     49                 // declare the actual listener interface
     50                 nl("final $listenerInterfaceName mListener;")
     51                 nl("final int mSourceId;")
     52                 block("public $className($listenerInterfaceName listener, int sourceId)") {
     53                     nl("mListener = listener;")
     54                     nl("mSourceId = sourceId;")
     55                 }
     56                 nl("")
     57                 nl("@Override")
     58                 block("public ${method.returnType.canonicalName} ${method.name}(${wrapper.argsWithTypes()})") {
     59                     val evaluate = "mListener.$listenerMethodName(${wrapper.allArgs()});"
     60                     if (method.returnType.isVoid) {
     61                         nl("$evaluate")
     62                     } else {
     63                         nl("return $evaluate")
     64                     }
     65                 }
     66                 nl("")
     67                 block("public interface $listenerInterfaceName") {
     68                     nl("${method.returnType} $listenerMethodName(${wrapper.allArgsWithTypes()});")
     69                 }
     70             }
     71         }
     72     }.generate()
     73 }