content: /**
   *   Copyright 2012-2019 Wicked Charts (http://github.com/adessoAG/wicked-charts)
   *
   *   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 de.adesso.wickedcharts.wicket7;
  
  import org.apache.wicket.ajax.AbstractDefaultAjaxBehavior;
  import org.apache.wicket.ajax.attributes.AjaxRequestAttributes;
  import org.apache.wicket.request.cycle.RequestCycle;
  import org.apache.wicket.request.http.WebRequest;
  import org.apache.wicket.util.string.StringValue;
  
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * This AJAX behavior passes the values of a set of defined javascript variables
   * to the server via AJAX.
   *
   * @author Tom Hombergs (tom.hombergs@gmail.com)
   */
  @SuppressWarnings("serial")
  public abstract class JavaScriptExpressionSendingAjaxBehavior extends AbstractDefaultAjaxBehavior {
  
      private final Map<String, String> javascriptExpressions = new HashMap<>();
  
      /**
       * Reads the value of the given javascript variable from the AJAX request.
       *
       * @param parameterName the parameter name of the javascript expression whose value to
       *                      read. The parameterName must have been specified earlier when
       *                      calling {@link #addJavaScriptValue(String, String)}.
       * @return the string representation of the javascript expression's value
       */
      protected StringValue getVariableValue(String parameterName) {
          RequestCycle cycle = RequestCycle.get();
          WebRequest webRequest = (WebRequest) cycle.getRequest();
          StringValue value = webRequest.getRequestParameters().getParameterValue(parameterName);
          return value;
      }
  
      @Override
      public CharSequence getCallbackScript() {
          String script = super.getCallbackScript().toString();
          for (Map.Entry<String, String> entry : this.javascriptExpressions.entrySet()) {
              String expression = entry.getValue();
              script = script.replace("\"" + expression + "\"", expression);
          }
          return script;
      }
  
      /**
       * Adds a javascript expression whose value to be passed from client to
       * server. The result value of this expression is sent to the server via AJAX
       * and can be accessed using the method {@link #getVariableValue(String)}. A
       * javascript variable with the given name must exist within the scope the
       * callback script of this behavior is called on the client side!
       *
       * @param parameterName        the name under which the value of the given javascript expression
       *                             can be accessed later
       * @param javascriptExpression the javascript expression whose value pass from client to server.
       */
      public void addJavaScriptValue(String parameterName, String javascriptExpression) {
          this.javascriptExpressions.put(parameterName, javascriptExpression);
      }
  
      /**
       * Adds a set of javascript expressions to be passed from client to server.
       *
       * @param parameterMap a map containing the name of a parameter as key and a javascript
       *                     expression as value
       * @see #addJavaScriptValue(String, String)
       */
      public void addJavaScriptValues(Map<String, String> parameterMap) {
          for (Map.Entry<String, String> entry : parameterMap.entrySet()) {
              String parameterName = entry.getKey();
              String parameterValue = entry.getValue();
              this.javascriptExpressions.put(parameterName, parameterValue);
          }
      }
  
      @Override
      protected void updateAjaxAttributes(AjaxRequestAttributes attributes) {
          super.updateAjaxAttributes(attributes);
          for (Map.Entry<String, String> entry : this.javascriptExpressions.entrySet()) {
              String parameterName = entry.getKey();
              String parameterValue = entry.getValue();
              attributes.getExtraParameters().put(parameterName, parameterValue);
          }
      }
  
  }
  