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   *  or more contributor license agreements.  See the NOTICE file
   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you 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
   *
   *    https://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
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   ****************************************************************/
  
  
  package org.apache.cayenne.swing;
  
  import java.util.Map;
  
  import ognl.Ognl;
  import ognl.OgnlException;
  
  import org.apache.cayenne.CayenneRuntimeException;
  import org.apache.cayenne.util.Util;
  
  /**
   * A class for expression evaluation using a designated scripting language (now - OGNL).
   * 
   */
  public class BindingExpression {
  
      private Object compiled;
      protected String expression;
  
      static Throwable unwind(Throwable th) {
          if (th instanceof OgnlException) {
              Throwable reason = ((OgnlException) th).getReason();
              return (reason != null) ? unwind(reason) : th;
          }
          else {
              return Util.unwindException(th);
          }
      }
  
      public BindingExpression(String expression) {
          try {
              this.compiled = Ognl.parseExpression(expression);
          }
          catch (OgnlException ex) {
              throw new CayenneRuntimeException(
                      "Invalid expression - " + expression,
                      BindingBase.unwind(ex));
          }
  
          this.expression = expression;
      }
  
      public String getExpression() {
          return expression;
      }
  
      public void setValue(Object context, Map contextVariables, Object value) {
          if (context == null) {
              throw new BindingException("No context");
          }
  
          try {
              Ognl.setValue(compiled, contextVariables, context, value);
          }
          catch (OgnlException ex) {
              throw new BindingException(
                      "Evaluation failed in context: " + context,
                      unwind(ex));
          }
      }
  
      public Object getValue(Object context, Map contextVariables) {
          if (context == null) {
              throw new BindingException("No context");
          }
  
          try {
              return Ognl.getValue(compiled, contextVariables, context);
          }
          catch (OgnlException ex) {
              throw new BindingException(
                      "Evaluation failed in context: " + context,
                      unwind(ex));
          }
      }
  }
  