EntityCursorConverterWriter.kt
/*
* 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 androidx.room.writer
import androidx.room.compiler.codegen.CodeLanguage
import androidx.room.compiler.codegen.XCodeBlock
import androidx.room.compiler.codegen.XFunSpec
import androidx.room.compiler.codegen.XTypeName
import androidx.room.ext.AndroidTypeNames.CURSOR
import androidx.room.ext.RoomMemberNames
import androidx.room.ext.capitalize
import androidx.room.ext.stripNonJava
import androidx.room.solver.CodeGenScope
import androidx.room.vo.Entity
import androidx.room.vo.FieldWithIndex
import java.util.Locale
class EntityCursorConverterWriter(val entity: Entity) : TypeWriter.SharedFunctionSpec(
"entityCursorConverter_${entity.typeName.toString(CodeLanguage.JAVA).stripNonJava()}"
) {
override fun getUniqueKey(): String {
return "generic_entity_converter_of_${entity.element.qualifiedName}"
}
override fun prepare(methodName: String, writer: TypeWriter, builder: XFunSpec.Builder) {
builder.apply {
val cursorParamName = "cursor"
addParameter(CURSOR, cursorParamName)
returns(entity.typeName)
addCode(buildConvertMethodBody(writer, cursorParamName))
}
}
private fun buildConvertMethodBody(writer: TypeWriter, cursorParamName: String): XCodeBlock {
val scope = CodeGenScope(writer)
val entityVar = scope.getTmpVar("_entity")
scope.builder.apply {
addLocalVariable(
entityVar,
entity.typeName
)
val fieldsWithIndices = entity.fields.map {
val indexVar = scope.getTmpVar(
"_cursorIndexOf${it.name.stripNonJava().capitalize(Locale.US)}"
)
addLocalVariable(
name = indexVar,
typeName = XTypeName.PRIMITIVE_INT,
assignExpr = XCodeBlock.of(
language,
"%M(%N, %S)",
RoomMemberNames.CURSOR_UTIL_GET_COLUMN_INDEX,
cursorParamName,
it.columnName
)
)
FieldWithIndex(
field = it,
indexVar = indexVar,
alwaysExists = false
)
}
FieldReadWriteWriter.readFromCursor(
outVar = entityVar,
outPojo = entity,
cursorVar = cursorParamName,
fieldsWithIndices = fieldsWithIndices,
relationCollectors = emptyList(), // no relationship for entities
scope = scope
)
addStatement("return %L", entityVar)
}
return scope.generate()
}
}