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A processor for the @AutoSerialize annotation

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package eu.toolchain.serializer.processor.field;

import com.google.common.base.CaseFormat;
import com.google.common.base.Joiner;
import com.google.common.collect.ImmutableList;
import com.squareup.javapoet.ClassName;
import com.squareup.javapoet.MethodSpec;
import com.squareup.javapoet.TypeName;
import eu.toolchain.serializer.processor.annotation.BuilderMirror;
import java.util.List;
import lombok.Data;

/**
 * @author udoprog
 */
@Data
public class FieldBuilder {
  static final Joiner emptyJoiner = Joiner.on("");

  final BuilderMirror builder;

  /**
   * If {@code true}, indicates that the constructor of the builder should be used when
   * instantiating it.
   */
  final boolean useConstructor;

  /**
   * If {@code true}, indicates that builder methods are setters instead of using a one-to-one
   * mapping of field names.
   */
  final boolean useSetter;

  /**
   * Contains the name of the method to use, unless {@link #useConstructor} is {@code true}.
   */
  final String method;

  public void writeTo(ClassName returnType, MethodSpec.Builder b, List variables) {
    final ImmutableList.Builder builders = ImmutableList.builder();
    final ImmutableList.Builder