autonomouslogic/dynamo-mapper

package com.autonomouslogic.dynamomapper.codegen.generate.keyobject;

import static com.autonomouslogic.dynamomapper.codegen.generate.SyncMapperGenerator.REQUEST;

import com.autonomouslogic.dynamomapper.codegen.util.TypeHelper;
import com.squareup.javapoet.AnnotationSpec;
import com.squareup.javapoet.ClassName;
import com.squareup.javapoet.CodeBlock;
import com.squareup.javapoet.MethodSpec;
import com.squareup.javapoet.ParameterizedTypeName;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.lang.model.element.Modifier;
import lombok.Data;
import lombok.NoArgsConstructor;

@NoArgsConstructor
@Data
public class AsyncKeyObjectWrapperGenerator extends KeyObjectWrapperGenerator {
    public MethodSpec generate() {
        // Create signature.
        var wrapper = MethodSpec.methodBuilder(methodNameFactory.create(method, "FromKeyObject", multiple))
                .addModifiers(Modifier.PUBLIC)
                .addTypeVariable(TypeHelper.T);
        wrapper.returns(method.returnType);
        wrapper.addExceptions(method.exceptions);
        if (!futureWrap) {
            wrapper.addException(IOException.class);
        }
        wrapper.addAnnotation(AnnotationSpec.builder(SuppressWarnings.class)
                .addMember("value", "\"unchecked\"")
                .build());
        // Add parameters.
        if (!multiple) {
            wrapper.addParameter(TypeHelper.T, "keyObject");
        } else {
            var type = TypeHelper.genericWildcard(ClassName.get(List.class));
            wrapper.addParameter(type, "keyObject");
        }
        var params = new ArrayList<>(method.parameters);
        params.removeIf(p -> p.name.equals(REQUEST));
        params.removeIf(p -> p.name.equals("clazz"));
        wrapper.addParameters(params);
        // Write body.
        var requestFactoryCode = CodeBlock.builder();
        var firstParamTypeName = method.parameters.get(0).type;
        requestFactoryCode.add("var builder = requestFactory.$L(keyObject);\n", factoryMethodName);
        if (firstParamTypeName instanceof ParameterizedTypeName) {
            requestFactoryCode.addStatement("\tconsumer.accept(builder)");
        }
        requestFactoryCode.add(
                CodeBlock.of("return $L(builder.build(), (Class<T>) keyObject.getClass());\n", method.name));

        var code = CodeBlock.builder();
        if (futureWrap) {
            code.add(CodeBlock.of("return $T.wrapFuture(() -> {\n" + "\t$L\n" + "});", requestFactoryCode.build()));
        } else {
            code.add(requestFactoryCode.build());
        }
        wrapper.addCode(code.build());

        TypeHelper.nonNullParameters(wrapper);
        return wrapper.build();
    }
}