Add fromSavedState handle method to generated nav args #122
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danysantiago
requested changes
Jan 22, 2021
| @@ -248,6 +248,52 @@ class JavaNavWriter(private val useAndroidX: Boolean = true) : NavWriter<JavaCod | |||
| addStatement("return $N", result) | |||
| }.build() | |||
|
|
|||
| val fromSavedStateHandleMethod = MethodSpec.methodBuilder("fromSavedStateHandle").apply { | |||
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There is a lot of shared code between this method spec and fromBundleMethod, lets try to combine it by creating a local function with the common code and then invoking it with the distinct, something like this:
fun MethodSpec.Builder.commonFromArgGetCode(
fromVariableName: String,
resultVariableName: String,
arg: Argument,
argGetBlock: MethodSpec.Builder.() -> Unit
) {
beginControlFlow("if ($N.contains($S))", fromVariableName, arg.name).apply {
argGetBlock()
addNullCheck(arg, arg.sanitizedName)
addStatement(
"$resultVariableName.$N.put($S, $N)",
specs.hashMapFieldSpec,
arg.name,
arg.sanitizedName
)
}
if (arg.defaultValue == null) {
nextControlFlow("else")
addStatement(
"throw new $T($S)", java.lang.IllegalArgumentException::class.java,
"Required argument \"${arg.name}\" is missing and does " +
"not have an android:defaultValue"
)
} else {
nextControlFlow("else")
addStatement(
"$resultVariableName.$N.put($S, $L)",
specs.hashMapFieldSpec,
arg.name,
arg.defaultValue.write()
)
}
endControlFlow()
}
then you can use it like this:
val fromSavedStateHandleMethod = MethodSpec.methodBuilder("fromSavedStateHandle").apply {
addAnnotation(annotations.NONNULL_CLASSNAME)
addModifiers(Modifier.PUBLIC, Modifier.STATIC)
addAnnotation(specs.suppressAnnotationSpec)
val savedStateHandle = "savedStateHandle"
addParameter(
ParameterSpec.builder(SAVED_STATE_HANDLE_CLASSNAME, savedStateHandle)
.addAnnotation(specs.androidAnnotations.NONNULL_CLASSNAME)
.build()
)
returns(className)
val result = "__result"
addStatement("$T $N = new $T()", className, result, className)
args.forEach { arg ->
commonFromArgGetCode(
fromVariableName = savedStateHandle,
resultVariableName = result,
arg= arg
) {
addStatement("$T $N", arg.type.typeName(), arg.sanitizedName)
addStatement("$N = $N.get($S)", arg.sanitizedName, savedStateHandle, arg.name)
}
}
addStatement("return $N", result)
}.build()
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Done for the JavaNavWriter.
I also checked the KotlinNavWriter and the only thing that could make sense here is the else branch where we read default values, but given that it's only ~7 lines I'd keep it duplicated because I think it makes it more readable that way.
| addStatement("$T $N = new $T()", className, result, className) | ||
| args.forEach { arg -> | ||
| beginControlFlow("if ($N.contains($S))", savedStateHandle, arg.name).apply { | ||
| addStatement("$T $N", arg.type.typeName(), arg.sanitizedName) |
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Looks like the variable declaration and initialization can be done in the same statement
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Not anymore with the newest changes using the common addReadSingleArgBlock function 😄
jbw0033
approved these changes
Jan 25, 2021
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Proposed Changes
fromSavedStatemethod for all nav args classes, similar to thefromBundleone.Testing
Test: Adapted existing tests to also include the new method
Issues Fixed
Fixes: 136967621