org.camunda.bpm.engine.impl.el.UelExpressionCondition Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of camunda-engine Show documentation

There is a newer version: 7.23.0-alpha2

/* 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.camunda.bpm.engine.impl.el;

import org.camunda.bpm.engine.delegate.DelegateExecution;
import org.camunda.bpm.engine.delegate.Expression;
import org.camunda.bpm.engine.impl.Condition;

import static org.camunda.bpm.engine.impl.util.EnsureUtil.ensureInstanceOf;
import static org.camunda.bpm.engine.impl.util.EnsureUtil.ensureNotNull;


/**
 * {@link Condition} that resolves an UEL expression at runtime.  
 * 
 * @author Joram Barrez
 * @author Frederik Heremans
 */
public class UelExpressionCondition implements Condition {
  
  protected Expression expression;
  
  public UelExpressionCondition(Expression expression) {
    this.expression = expression;
  }

  public boolean evaluate(DelegateExecution execution) {
    Object result = expression.getValue(execution);
    ensureNotNull("condition expression returns null", "result", result);
    ensureInstanceOf("condition expression returns non-Boolean", "result", result, Boolean.class);
    return (Boolean) result;
  }

}