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/*
* 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.context.variable;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import org.drools.core.ClassObjectFilter;
import org.drools.core.event.ProcessEventSupport;
import org.jbpm.process.core.context.variable.Variable;
import org.jbpm.process.core.context.variable.VariableScope;
import org.jbpm.process.core.context.variable.VariableViolationException;
import org.jbpm.process.instance.ContextInstanceContainer;
import org.jbpm.process.instance.InternalProcessRuntime;
import org.jbpm.process.instance.context.AbstractContextInstance;
import org.jbpm.workflow.core.Node;
import org.jbpm.workflow.instance.node.CompositeContextNodeInstance;
import org.kie.api.runtime.KieSession;
import org.kie.api.runtime.process.CaseData;
import org.kie.api.runtime.process.ProcessInstance;
import org.kie.api.runtime.rule.FactHandle;
/**
*
*/
public class VariableScopeInstance extends AbstractContextInstance {
private static final long serialVersionUID = 510l;
private Map variables = new HashMap();
private transient String variableIdPrefix = null;
private transient String variableInstanceIdPrefix = null;
public String getContextType() {
return VariableScope.VARIABLE_SCOPE;
}
public Object getVariable(String name) {
Object value = variables.get(name);
if (value != null) {
return value;
}
// support for processInstanceId and parentProcessInstanceId
if ("processInstanceId".equals(name) && getProcessInstance() != null) {
return getProcessInstance().getId();
} else if ("parentProcessInstanceId".equals(name) && getProcessInstance() != null) {
return getProcessInstance().getParentProcessInstanceId();
}
if (getProcessInstance() != null && getProcessInstance().getKnowledgeRuntime() != null) {
// support for globals
value = getProcessInstance().getKnowledgeRuntime().getGlobal(name);
if (value != null) {
return value;
}
// support for case file data
@SuppressWarnings("unchecked")
Collection caseFiles = (Collection) getProcessInstance().getKnowledgeRuntime().getObjects(new ClassObjectFilter(CaseData.class));
if (caseFiles.size() == 1) {
CaseData caseFile = caseFiles.iterator().next();
// check if there is case file prefix and if so remove it before checking case file data
final String lookUpName = name.startsWith(VariableScope.CASE_FILE_PREFIX) ? name.replaceFirst(VariableScope.CASE_FILE_PREFIX, "") : name;
if (caseFile != null) {
return caseFile.getData(lookUpName);
}
}
}
return null;
}
public Map getVariables() {
return Collections.unmodifiableMap(variables);
}
public void setVariable(String name, Object value) {
if (name == null) {
throw new IllegalArgumentException(
"The name of a variable may not be null!");
}
Object oldValue = getVariable(name);
if (oldValue == null) {
if (value == null) {
return;
}
}
// check if variable that is being set is readonly and has already been set
if (oldValue != null && !oldValue.equals(value) && getVariableScope().isReadOnly(name)) {
throw new VariableViolationException(getProcessInstance().getId(), name, "Variable '" + name + "' is already set and is marked as read only");
}
ProcessEventSupport processEventSupport = ((InternalProcessRuntime) getProcessInstance()
.getKnowledgeRuntime().getProcessRuntime()).getProcessEventSupport();
processEventSupport.fireBeforeVariableChanged(
(variableIdPrefix == null ? "" : variableIdPrefix + ":") + name,
(variableInstanceIdPrefix == null? "" : variableInstanceIdPrefix + ":") + name,
oldValue, value, getVariableScope().tags(name), getProcessInstance(),
getProcessInstance().getKnowledgeRuntime());
internalSetVariable(name, value);
processEventSupport.fireAfterVariableChanged(
(variableIdPrefix == null ? "" : variableIdPrefix + ":") + name,
(variableInstanceIdPrefix == null? "" : variableInstanceIdPrefix + ":") + name,
oldValue, value, getVariableScope().tags(name), getProcessInstance(),
getProcessInstance().getKnowledgeRuntime());
}
public void internalSetVariable(String name, Object value) {
if (name.startsWith(VariableScope.CASE_FILE_PREFIX)) {
String nameInCaseFile = name.replaceFirst(VariableScope.CASE_FILE_PREFIX, "");
// store it under case file rather regular variables
@SuppressWarnings("unchecked")
Collection caseFiles = (Collection) getProcessInstance().getKnowledgeRuntime().getObjects(new ClassObjectFilter(CaseData.class));
if (caseFiles.size() == 1) {
CaseData caseFile = (CaseData) caseFiles.iterator().next();
FactHandle factHandle = getProcessInstance().getKnowledgeRuntime().getFactHandle(caseFile);
if (value == null) {
caseFile.remove(nameInCaseFile);
} else {
caseFile.add(nameInCaseFile, value);
}
// case data fire rules only if the state is not pending (active)
if (getProcessInstance().getState() != ProcessInstance.STATE_PENDING) {
getProcessInstance().getKnowledgeRuntime().update(factHandle, caseFile);
((KieSession) getProcessInstance().getKnowledgeRuntime()).fireAllRules();
}
return;
}
}
// not a case, store it in normal variables
variables.put(name, value);
}
public VariableScope getVariableScope() {
return (VariableScope) getContext();
}
public void setContextInstanceContainer(ContextInstanceContainer contextInstanceContainer) {
super.setContextInstanceContainer(contextInstanceContainer);
for (Variable variable : getVariableScope().getVariables()) {
if (variable.getValue() != null) {
setVariable(variable.getName(), variable.getValue());
}
}
if (contextInstanceContainer instanceof CompositeContextNodeInstance) {
this.variableIdPrefix = ((Node) ((CompositeContextNodeInstance) contextInstanceContainer).getNode()).getUniqueId();
this.variableInstanceIdPrefix = ((CompositeContextNodeInstance) contextInstanceContainer).getUniqueId();
}
}
public void enforceRequiredVariables() {
VariableScope variableScope = getVariableScope();
for (Variable variable : variableScope.getVariables()) {
String name = variable.getName();
if (variableScope.isRequired(name)) {
// check case file if it is prefixed
if (name.startsWith(VariableScope.CASE_FILE_PREFIX)) {
if (!findCaseData(name)) {
throw new VariableViolationException(getProcessInstance().getId(), name, "Case file item '" + name + "' is required but not set");
}
// otherwise check variables
} else if (!hasData(variables.get(name))) {
throw new VariableViolationException(getProcessInstance().getId(), name, "Variable '" + name + "' is required but not set");
}
}
}
}
protected boolean findCaseData(String name) {
boolean found = false;
String nameInCaseFile = name.replaceFirst(VariableScope.CASE_FILE_PREFIX, "");
// store it under case file rather regular variables
@SuppressWarnings("unchecked")
Collection caseFiles = (Collection) getProcessInstance().getKnowledgeRuntime().getObjects(new ClassObjectFilter(CaseData.class));
if (caseFiles.size() == 1) {
CaseData caseData = caseFiles.iterator().next();
if (hasData(caseData.getData(nameInCaseFile))) {
found = true;
}
}
return found;
}
private boolean hasData(Object data) {
return data != null && (!(data instanceof CharSequence) || !data.toString().trim().isEmpty());
}
}
