org.jbpm.process.instance.impl.util.VariableUtil Maven / Gradle / Ivy
/*
* Copyright 2017 Red Hat, Inc. and/or its affiliates.
*
* 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.jbpm.process.instance.impl.util;
import java.util.HashMap;
import java.util.Map;
import java.util.regex.Matcher;
import org.drools.mvel.MVELSafeHelper;
import org.jbpm.process.core.context.variable.VariableScope;
import org.jbpm.process.instance.context.variable.VariableScopeInstance;
import org.jbpm.util.PatternConstants;
import org.jbpm.workflow.instance.impl.NodeInstanceResolverFactory;
import org.kie.api.runtime.process.NodeInstance;
public class VariableUtil {
public static String resolveVariable(String s, NodeInstance nodeInstance) {
if (s == null) {
return null;
}
Map replacements = new HashMap();
Matcher matcher = PatternConstants.PARAMETER_MATCHER.matcher(s);
while (matcher.find()) {
String paramName = matcher.group(1);
if (replacements.get(paramName) == null) {
VariableScopeInstance variableScopeInstance = (VariableScopeInstance)
((org.jbpm.workflow.instance.NodeInstance)nodeInstance).resolveContextInstance(VariableScope.VARIABLE_SCOPE, paramName);
if (variableScopeInstance != null) {
Object variableValue = variableScopeInstance.getVariable(paramName);
String variableValueString = variableValue == null ? "" : variableValue.toString();
replacements.put(paramName, variableValueString);
} else {
try {
Object variableValue = MVELSafeHelper.getEvaluator().eval(paramName, new NodeInstanceResolverFactory((org.jbpm.workflow.instance.NodeInstance) nodeInstance));
String variableValueString = variableValue == null ? "" : variableValue.toString();
replacements.put(paramName, variableValueString);
} catch (Throwable t) {
}
}
}
}
for (Map.Entry replacement: replacements.entrySet()) {
s = s.replace("#{" + replacement.getKey() + "}", replacement.getValue());
}
return s;
}
}