How to use

writeExpression

method

in

com.yahoo.aptutils.writer.JavaFileWriter

private boolean emitPropertyReferenceArrayBody(boolean alias) throws IOException {
  for (PropertyGenerator propertyGenerator : modelSpec.getPropertyGenerators()) {
    Expression reference = Expressions.staticReference(modelSpec.getModelSpecName(),
        propertyGenerator.getPropertyName());
    if (alias) {
      VariableElement field = propertyGenerator.getField();
      if (field != null) {
        Alias aliasAnnotation = field.getAnnotation(Alias.class);
        if (aliasAnnotation != null && !AptUtils.isEmpty(aliasAnnotation.value().trim())) {
          reference = reference.callMethod("as", "\"" + aliasAnnotation.value().trim() + "\"");
        }
      }
    }
    writer.writeExpression(reference);
    writer.appendString(",\n");
  }
  return !AptUtils.isEmpty(modelSpec.getPropertyGenerators());
}

@Override
public void emitAdditionalJava(JavaFileWriter writer) throws IOException {
  List<ErrorInfo> errors = modelSpec.getLoggedErrors();
  if (errors.size() > 0) {
    writer.writeExpression(new ModelGenErrorsExpression(errors))
        .writeNewline();
    TypeDeclarationParameters dummyErrorClass = new TypeDeclarationParameters()
        .setModifiers(Modifier.STATIC, Modifier.FINAL)
        .setName(new DeclaredTypeName(modelSpec.getGeneratedClassName().toString(), "LoggedErrors"))
        .setKind(JavaFileWriter.Type.CLASS);
    writer.beginTypeDefinition(dummyErrorClass);
    writer.writeComment("Dummy class for holding logged error annotations");
    writer.finishTypeDefinition();
  }
}

  @Override
  public boolean writeExpression(JavaFileWriter writer) throws IOException {
    writer.appendString("@")
        .appendString(writer.shortenName(MODEL_GEN_ERRORS, false))
        .appendString("({\n");
    writer.moveToScope(JavaFileWriter.Scope.METHOD_DEFINITION);
    boolean needsNewline = false;
    for (ErrorInfo errorInfo : errors) {
      if (needsNewline) {
        writer.appendString(",").writeNewline();
      }
      needsNewline = true;
      writer.writeExpression(new ModelGenErrorSingle(errorInfo));
    }
    writer.writeNewline();
    writer.finishScope(JavaFileWriter.Scope.METHOD_DEFINITION);
    writer.writeString("})");
    return true;
  }
}

private boolean emitPropertyReferenceArrayBody(boolean alias) throws IOException {
  for (PropertyGenerator propertyGenerator : modelSpec.getPropertyGenerators()) {
    Expression reference = Expressions.staticReference(modelSpec.getModelSpecName(),
        propertyGenerator.getPropertyName());
    if (alias) {
      VariableElement field = propertyGenerator.getField();
      if (field != null) {
        Alias aliasAnnotation = field.getAnnotation(Alias.class);
        if (aliasAnnotation != null && !AptUtils.isEmpty(aliasAnnotation.value().trim())) {
          reference = reference.callMethod("as", "\"" + aliasAnnotation.value().trim() + "\"");
        }
      }
    }
    writer.writeExpression(reference);
    writer.appendString(",\n");
  }
  return !AptUtils.isEmpty(modelSpec.getPropertyGenerators());
}

@Override
public void emitAdditionalJava(JavaFileWriter writer) throws IOException {
  List<ErrorInfo> errors = modelSpec.getLoggedErrors();
  if (errors.size() > 0) {
    writer.writeExpression(new ModelGenErrorsExpression(errors))
        .writeNewline();
    TypeDeclarationParameters dummyErrorClass = new TypeDeclarationParameters()
        .setModifiers(Modifier.STATIC, Modifier.FINAL)
        .setName(new DeclaredTypeName(modelSpec.getGeneratedClassName().toString(), "LoggedErrors"))
        .setKind(JavaFileWriter.Type.CLASS);
    writer.beginTypeDefinition(dummyErrorClass);
    writer.writeComment("Dummy class for holding logged error annotations");
    writer.finishTypeDefinition();
  }
}

  @Override
  public boolean writeExpression(JavaFileWriter writer) throws IOException {
    writer.appendString("@")
        .appendString(writer.shortenName(MODEL_GEN_ERRORS, false))
        .appendString("({\n");
    writer.moveToScope(JavaFileWriter.Scope.METHOD_DEFINITION);
    boolean needsNewline = false;
    for (ErrorInfo errorInfo : errors) {
      if (needsNewline) {
        writer.appendString(",").writeNewline();
      }
      needsNewline = true;
      writer.writeExpression(new ModelGenErrorSingle(errorInfo));
    }
    writer.writeNewline();
    writer.finishScope(JavaFileWriter.Scope.METHOD_DEFINITION);
    writer.writeString("})");
    return true;
  }
}