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Pebble Integration with Spring 4.x

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/*
 * Copyright (c) 2013 by Mitchell Bösecke
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
package com.mitchellbosecke.pebble.spring4.extension.function.bindingresult;

import com.mitchellbosecke.pebble.extension.Function;
import com.mitchellbosecke.pebble.template.EvaluationContext;
import com.mitchellbosecke.pebble.template.GlobalContext;

import org.springframework.validation.BindingResult;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 * Base class of the function interacting with the BindingResult
 *
 * @author Eric Bussieres
 */
public abstract class BaseBindingResultFunction implements Function {

  protected static final String PARAM_FIELD_NAME = "fieldName";
  protected static final String PARAM_FORM_NAME = "formName";

  private final List argumentNames = new ArrayList<>();

  protected BaseBindingResultFunction(String... argumentsName) {
    Collections.addAll(this.argumentNames, argumentsName);
  }

  @Override
  public List getArgumentNames() {
    return this.argumentNames;
  }

  protected BindingResult getBindingResult(String formName, EvaluationContext context) {
    String attribute = BindingResult.MODEL_KEY_PREFIX + formName;
    BindingResult bindingResult = (BindingResult) context.getVariable(attribute);
    if (bindingResult == null) {
      GlobalContext globalContext = (GlobalContext) context.getVariable("_context");
      if (globalContext != null) {
        return (BindingResult) globalContext.get(attribute);
      }
    }
    return bindingResult;
  }
}