/* 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.activiti.engine.impl.scripting;
import org.activiti.engine.ActivitiException;
import org.activiti.engine.DynamicBpmnConstants;
import org.activiti.engine.delegate.DelegateExecution;
import org.activiti.engine.impl.Condition;
import org.activiti.engine.impl.context.Context;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.node.ObjectNode;
/**
* @author Tom Baeyens
*/
public class ScriptCondition implements Condition {
private static final long serialVersionUID = 1L;
private final String expression;
private final String language;
public ScriptCondition(String expression, String language) {
this.expression = expression;
this.language = language;
}
public boolean evaluate(String sequenceFlowId, DelegateExecution execution) {
String conditionExpression = null;
if (Context.getProcessEngineConfiguration().isEnableProcessDefinitionInfoCache()) {
ObjectNode elementProperties = Context.getBpmnOverrideElementProperties(sequenceFlowId, execution.getProcessDefinitionId());
conditionExpression = getActiveValue(expression, DynamicBpmnConstants.SEQUENCE_FLOW_CONDITION, elementProperties);
} else {
conditionExpression = expression;
}
ScriptingEngines scriptingEngines = Context
.getProcessEngineConfiguration()
.getScriptingEngines();
Object result = scriptingEngines.evaluate(conditionExpression, language, execution);
if (result == null) {
throw new ActivitiException("condition script returns null: " + expression);
}
if (!(result instanceof Boolean)) {
throw new ActivitiException("condition script returns non-Boolean: " + result + " (" + result.getClass().getName() + ")");
}
return (Boolean) result;
}
protected String getActiveValue(String originalValue, String propertyName, ObjectNode elementProperties) {
String activeValue = originalValue;
if (elementProperties != null) {
JsonNode overrideValueNode = elementProperties.get(propertyName);
if (overrideValueNode != null) {
if (overrideValueNode.isNull()) {
activeValue = null;
} else {
activeValue = overrideValueNode.asText();
}
}
}
return activeValue;
}
}