br.com.objectos.io.compiler.FlatFileExceptionStaticFactory Maven / Gradle / Ivy

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/*
 * Copyright 2015 Objectos, Fábrica de Software LTDA.
 *
 * 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 br.com.objectos.io.compiler;

import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;

import javax.lang.model.element.Modifier;

import br.com.objectos.io.flat.ParseError;

import com.squareup.javapoet.ClassName;
import com.squareup.javapoet.CodeBlock;
import com.squareup.javapoet.CodeBlock.Builder;
import com.squareup.javapoet.MethodSpec;
import com.squareup.javapoet.ParameterSpec;
import com.squareup.javapoet.ParameterizedTypeName;
import com.squareup.javapoet.TypeName;
import com.squareup.javapoet.TypeSpec;

/**
 * @author [email protected] (Marcio Endo)
 */
class FlatFileExceptionStaticFactory extends AbstractHasFlatFile {

  public FlatFileExceptionStaticFactory(FlatFile file) {
    super(file);
  }

  public void addTo(TypeSpec.Builder type) {
    type.addMethod(get());
  }

  public MethodSpec get() {
    return MethodSpec.methodBuilder("of")
        .addModifiers(Modifier.PUBLIC, Modifier.STATIC)
        .addParameters(parameters())
        .returns(returns())
        .addCode(body())
        .build();
  }

  private CodeBlock body() {
    CodeBlock.Builder body = CodeBlock.builder()
        .addStatement("$T<$T> parseErrorList = new $T<>()", List.class, ParseError.class, ArrayList.class)
        .add("\n");

    List recordMethodList = recordMethodList();
    for (RecordMethod recordMethod : recordMethodList) {
      body.addStatement("$L.addParseErrorTo(parseErrorList)", recordMethod.methodInfoFieldName());
    }

    return body
        .add("\n")
        .add("return parseErrorList.isEmpty()\n")
        .add("    ? $T.empty()\n", Optional.class)
        .add("    : $T.of(new $T(parseErrorList", Optional.class, parseExceptionClassName())
        .add(constructorParameters())
        .add("));\n")
        .build();
  }

  private CodeBlock constructorParameters() {
    Builder b = CodeBlock.builder();

    List recordMethodList = recordMethodList();
    for (RecordMethod recordMethod : recordMethodList) {
      b.add(", $L", recordMethod.methodInfoFieldName());
    }

    return b.build();
  }

  private List parameters() {
    return exceptionFieldList().stream()
        .filter(ExceptionField::staticFactory)
        .map(ExceptionField::parameterSpec)
        .collect(Collectors.toList());
  }

  private TypeName returns() {
    return ParameterizedTypeName.get(ClassName.get(Optional.class), parseExceptionClassName());
  }

}