AbstractValueInput.java

/*
 * Copyright (c) 2001-2007, Inversoft Inc., All Rights Reserved
 *
 * 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 org.primeframework.mvc.control.form;

import org.primeframework.mvc.parameter.el.ExpressionEvaluator;

/**
 * This class is an abstract class that is used for the text and hidden controls since they both grab the value from the
 * action and setup the value attribute.
 *
 * @author Brian Pontarelli
 */
public abstract class AbstractValueInput extends AbstractInput {
  protected final ExpressionEvaluator expressionEvaluator;

  protected AbstractValueInput(ExpressionEvaluator expressionEvaluator, boolean labeled) {
    super(labeled);
    this.expressionEvaluator = expressionEvaluator;
  }

  /**
   * Adds a String attribute named <strong>value</strong> by pulling the value associated with the control. However, if
   * there is already a value attribute, it is always used. Likewise, if the value attribute is missing, the value
   * associated with the control is null and there is a <strong>defaultValue</strong> attribute, it is used.
   */
  protected void addAdditionalAttributes() {
    // Call super to handle the ID
    super.addAdditionalAttributes();

    String name = (String) attributes.get("name");
    String value;
    if (!attributes.containsKey("value") && currentAction() != null) {
      value = expressionEvaluator.getValue(name, currentAction(), dynamicAttributes);
      if (value == null) {
        value = (String) attributes.get("defaultValue");
      }

      if (value != null) {
        attributes.put("value", value);
      }
    }

    attributes.remove("defaultValue");
  }
}