package org.drools.ruleflow.core.validation;
/*
* Copyright 2005 JBoss Inc
*
* 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.
*/
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.drools.definition.process.Connection;
import org.drools.definition.process.Node;
import org.drools.definition.process.Process;
import org.drools.process.core.Work;
import org.drools.process.core.context.variable.Variable;
import org.drools.process.core.validation.ProcessValidationError;
import org.drools.process.core.validation.ProcessValidator;
import org.drools.process.core.validation.impl.ProcessValidationErrorImpl;
import org.drools.ruleflow.core.RuleFlowProcess;
import org.drools.workflow.core.impl.DroolsConsequenceAction;
import org.drools.workflow.core.node.ActionNode;
import org.drools.workflow.core.node.CompositeNode;
import org.drools.workflow.core.node.EndNode;
import org.drools.workflow.core.node.EventNode;
import org.drools.workflow.core.node.FaultNode;
import org.drools.workflow.core.node.ForEachNode;
import org.drools.workflow.core.node.Join;
import org.drools.workflow.core.node.MilestoneNode;
import org.drools.workflow.core.node.RuleSetNode;
import org.drools.workflow.core.node.Split;
import org.drools.workflow.core.node.StartNode;
import org.drools.workflow.core.node.SubProcessNode;
import org.drools.workflow.core.node.WorkItemNode;
import org.drools.workflow.core.node.CompositeNode.NodeAndType;
import org.mvel2.ErrorDetail;
import org.mvel2.ParserContext;
import org.mvel2.compiler.ExpressionCompiler;
/**
* Default implementation of a RuleFlow validator.
*
* @author <a href="mailto:kris_verlaenen@hotmail.com">Kris Verlaenen</a>
*/
public class RuleFlowProcessValidator implements ProcessValidator {
// TODO: make this pluggable
// TODO: extract generic process stuff and generic workflow stuff
private static RuleFlowProcessValidator instance;
private boolean startNodeFound;
private boolean endNodeFound;
private RuleFlowProcessValidator() {
}
public static RuleFlowProcessValidator getInstance() {
if ( instance == null ) {
instance = new RuleFlowProcessValidator();
}
return instance;
}
public ProcessValidationError[] validateProcess(final RuleFlowProcess process) {
final List<ProcessValidationError> errors = new ArrayList<ProcessValidationError>();
if (process.getName() == null) {
errors.add(new ProcessValidationErrorImpl(process,
"Process has no name."));
}
if (process.getId() == null || "".equals(process.getId())) {
errors.add(new ProcessValidationErrorImpl(process,
"Process has no id."));
}
if ( process.getPackageName() == null || "".equals( process.getPackageName() ) ) {
errors.add(new ProcessValidationErrorImpl(process,
"Process has no package name."));
}
// check start node of process
if ( process.getStart() == null ) {
errors.add(new ProcessValidationErrorImpl(process,
"Process has no start node."));
}
startNodeFound = false;
endNodeFound = false;
final Node[] nodes = process.getNodes();
validateNodes(nodes, errors, process);
if (!startNodeFound) {
errors.add(new ProcessValidationErrorImpl(process,
"Process has no start node."));
}
if (!endNodeFound) {
errors.add(new ProcessValidationErrorImpl(process,
"Process has no end node."));
}
for (final Iterator<Variable> it = process.getVariableScope().getVariables().iterator(); it.hasNext(); ) {
final Variable variable = it.next();
if (variable.getType() == null) {
errors.add(new ProcessValidationErrorImpl(process,
"Variable '" + variable.getName() + "' has no type."));
}
}
checkAllNodesConnectedToStart(process, errors);
return errors.toArray(new ProcessValidationError[errors.size()]);
}
private void validateNodes(Node[] nodes, List<ProcessValidationError> errors, RuleFlowProcess process) {
for ( int i = 0; i < nodes.length; i++ ) {
final Node node = nodes[i];
if (node instanceof StartNode) {
final StartNode startNode = (StartNode) node;
startNodeFound = true;
if (startNode.getTo() == null) {
errors.add(new ProcessValidationErrorImpl(process,
"Start node '" + node.getName() + "' [" + node.getId() + "] has no outgoing connection."));
}
} else if (node instanceof EndNode) {
final EndNode endNode = (EndNode) node;
endNodeFound = true;
if (endNode.getFrom() == null) {
errors.add(new ProcessValidationErrorImpl(process,
"End node '" + node.getName() + "' [" + node.getId() + "] has no incoming connection."));
}
} else if (node instanceof RuleSetNode) {
final RuleSetNode ruleSetNode = (RuleSetNode) node;
if (ruleSetNode.getFrom() == null) {
errors.add(new ProcessValidationErrorImpl(process,
"RuleSet node '" + node.getName() + "' [" + node.getId() + "] has no incoming connection."));
}
if (ruleSetNode.getTo() == null) {
errors.add(new ProcessValidationErrorImpl(process,
"RuleSet node '" + node.getName() + "' [" + node.getId() + "] has no outgoing connection."));
}
final String ruleFlowGroup = ruleSetNode.getRuleFlowGroup();
if (ruleFlowGroup == null || "".equals(ruleFlowGroup)) {
errors.add( new ProcessValidationErrorImpl(process,
"RuleSet node '" + node.getName() + "' [" + node.getId() + "] has no ruleflow-group."));
}
} else if (node instanceof Split) {
final Split split = (Split) node;
if (split.getType() == Split.TYPE_UNDEFINED) {
errors.add(new ProcessValidationErrorImpl(process,
"Split node '" + node.getName() + "' [" + node.getId() + "] has no type."));
}
if (split.getFrom() == null) {
errors.add(new ProcessValidationErrorImpl(process,
"Split node '" + node.getName() + "' [" + node.getId() + "] has no incoming connection."));
}
if (split.getDefaultOutgoingConnections().size() < 2) {
errors.add(new ProcessValidationErrorImpl(process,
"Split node '" + node.getName() + "' [" + node.getId() + "] does not have more than one outgoing connection: " + split.getOutgoingConnections().size() + "."));
}
if (split.getType() == Split.TYPE_XOR || split.getType() == Split.TYPE_OR ) {
for ( final Iterator<Connection> it = split.getDefaultOutgoingConnections().iterator(); it.hasNext(); ) {
final Connection connection = it.next();
if (split.getConstraint(connection) == null) {
errors.add(new ProcessValidationErrorImpl(process,
"Split node '" + node.getName() + "' [" + node.getId() + "] does not have a constraint for " + connection.toString() + "."));
}
}
}
} else if ( node instanceof Join ) {
final Join join = (Join) node;
if (join.getType() == Join.TYPE_UNDEFINED) {
errors.add(new ProcessValidationErrorImpl(process,
"Join node '" + node.getName() + "' [" + node.getId() + "] has no type."));
}
if (join.getDefaultIncomingConnections().size() < 2) {
errors.add(new ProcessValidationErrorImpl(process,
"Join node '" + node.getName() + "' [" + node.getId() + "] does not have more than one incoming connection: " + join.getIncomingConnections().size() + "."));
}
if (join.getTo() == null) {
errors.add(new ProcessValidationErrorImpl(process,
"Join node '" + node.getName() + "' [" + node.getId() + "] has no outgoing connection."));
}
if (join.getType() == Join.TYPE_N_OF_M) {
String n = join.getN();
if (!n.startsWith("#{") || !n.endsWith("}")) {
try {
new Integer(n);
} catch (NumberFormatException e) {
errors.add(new ProcessValidationErrorImpl(process,
"Join node '" + node.getName() + "' [" + node.getId() + "] has illegal n value: " + n));
}
}
}
} else if (node instanceof MilestoneNode) {
final MilestoneNode milestone = (MilestoneNode) node;
if (milestone.getFrom() == null) {
errors.add(new ProcessValidationErrorImpl(process,
"Milestone node '" + node.getName() + "' [" + node.getId() + "] has no incoming connection."));
}
if (milestone.getTo() == null) {
errors.add( new ProcessValidationErrorImpl(process,
"Milestone node '" + node.getName() + "' [" + node.getId() + "] has no outgoing connection."));
}
if (milestone.getConstraint() == null) {
errors.add( new ProcessValidationErrorImpl(process,
"Milestone node '" + node.getName() + "' [" + node.getId() + "] has no constraint."));
}
} else if (node instanceof SubProcessNode) {
final SubProcessNode subProcess = (SubProcessNode) node;
if (subProcess.getFrom() == null) {
errors.add(new ProcessValidationErrorImpl(process,
"SubProcess node '" + node.getName() + "' [" + node.getId() + "] has no incoming connection."));
}
if (subProcess.getTo() == null) {
errors.add(new ProcessValidationErrorImpl(process,
"SubProcess node '" + node.getName() + "' [" + node.getId() + "] has no outgoing connection."));
}
if (subProcess.getProcessId() == null) {
errors.add(new ProcessValidationErrorImpl(process,
"SubProcess node '" + node.getName() + "' [" + node.getId() + "] has no process id."));
}
} else if (node instanceof ActionNode) {
final ActionNode actionNode = (ActionNode) node;
if (actionNode.getFrom() == null) {
errors.add(new ProcessValidationErrorImpl(process,
"Action node '" + node.getName() + "' [" + node.getId() + "] has no incoming connection."));
}
if (actionNode.getTo() == null) {
errors.add(new ProcessValidationErrorImpl(process,
"Action node '" + node.getName() + "' [" + node.getId() + "] has no outgoing connection."));
}
if (actionNode.getAction() == null) {
errors.add(new ProcessValidationErrorImpl(process,
"Action node '" + node.getName() + "' [" + node.getId() + "] has no action."));
} else {
if (actionNode.getAction() instanceof DroolsConsequenceAction) {
DroolsConsequenceAction droolsAction = (DroolsConsequenceAction) actionNode.getAction();
String actionString = droolsAction.getConsequence();
if (actionString == null) {
errors.add(new ProcessValidationErrorImpl(process,
"Action node '" + node.getName() + "' [" + node.getId() + "] has empty action."));
} else if( "mvel".equals( droolsAction.getDialect() ) ) {
try {
ExpressionCompiler compiler = new ExpressionCompiler(actionString);
compiler.setVerifying(true);
ParserContext parserContext = new ParserContext();
//parserContext.setStrictTypeEnforcement(true);
compiler.compile(parserContext);
List<ErrorDetail> mvelErrors = parserContext.getErrorList();
if (mvelErrors != null) {
for (Iterator<ErrorDetail> iterator = mvelErrors.iterator(); iterator.hasNext(); ) {
ErrorDetail error = iterator.next();
errors.add(new ProcessValidationErrorImpl(process,
"Action node '" + node.getName() + "' [" + node.getId() + "] has invalid action: " + error.getMessage() + "."));
}
}
} catch (Throwable t) {
errors.add(new ProcessValidationErrorImpl(process,
"Action node '" + node.getName() + "' [" + node.getId() + "] has invalid action: " + t.getMessage() + "."));
}
}
}
}
} else if (node instanceof WorkItemNode) {
final WorkItemNode workItemNode = (WorkItemNode) node;
if (workItemNode.getFrom() == null) {
errors.add(new ProcessValidationErrorImpl(process,
"WorkItem node '" + node.getName() + "' [" + node.getId() + "] has no incoming connection."));
}
if (workItemNode.getTo() == null) {
errors.add(new ProcessValidationErrorImpl(process,
"WorkItem node '" + node.getName() + "' [" + node.getId() + "] has no outgoing connection."));
}
if (workItemNode.getWork() == null) {
errors.add(new ProcessValidationErrorImpl(process,
"WorkItem node '" + node.getName() + "' [" + node.getId() + "] has no work specified."));
} else {
Work work = workItemNode.getWork();
if (work.getName() == null) {
errors.add(new ProcessValidationErrorImpl(process,
"WorkItem node '" + node.getName() + "' [" + node.getId() + "] has no work name."));
}
}
} else if (node instanceof ForEachNode) {
final ForEachNode forEachNode = (ForEachNode) node;
String variableName = forEachNode.getVariableName();
if (variableName == null || "".equals(variableName)) {
errors.add(new ProcessValidationErrorImpl(process,
"ForEach node '" + node.getName() + "' [" + node.getId() + "] has no variable name"));
}
String collectionExpression = forEachNode.getCollectionExpression();
if (collectionExpression == null || "".equals(collectionExpression)) {
errors.add(new ProcessValidationErrorImpl(process,
"ForEach node '" + node.getName() + "' [" + node.getId() + "] has no collection expression"));
}
if (forEachNode.getIncomingConnections(org.drools.workflow.core.Node.CONNECTION_DEFAULT_TYPE).size() == 0) {
errors.add(new ProcessValidationErrorImpl(process,
"ForEach node '" + node.getName() + "' [" + node.getId() + "] has no incoming connection"));
}
if (forEachNode.getOutgoingConnections(org.drools.workflow.core.Node.CONNECTION_DEFAULT_TYPE).size() == 0) {
errors.add(new ProcessValidationErrorImpl(process,
"ForEach node '" + node.getName() + "' [" + node.getId() + "] has no outgoing connection"));
}
if (forEachNode.getLinkedIncomingNode(org.drools.workflow.core.Node.CONNECTION_DEFAULT_TYPE) == null) {
errors.add(new ProcessValidationErrorImpl(process,
"ForEach node '" + node.getName() + "' [" + node.getId() + "] has no linked start node"));
}
if (forEachNode.getLinkedOutgoingNode(org.drools.workflow.core.Node.CONNECTION_DEFAULT_TYPE) == null) {
errors.add(new ProcessValidationErrorImpl(process,
"ForEach node '" + node.getName() + "' [" + node.getId() + "] has no linked end node"));
}
validateNodes(forEachNode.getNodes(), errors, process);
} else if (node instanceof CompositeNode) {
final CompositeNode compositeNode = (CompositeNode) node;
for (Map.Entry<String, NodeAndType> inType: compositeNode.getLinkedIncomingNodes().entrySet()) {
if (compositeNode.getIncomingConnections(inType.getKey()).size() == 0) {
errors.add(new ProcessValidationErrorImpl(process,
"Composite node '" + node.getName() + "' [" + node.getId() + "] has no incoming connection for type " + inType.getKey()));
}
if (inType.getValue().getNode() == null) {
errors.add(new ProcessValidationErrorImpl(process,
"Composite node '" + node.getName() + "' [" + node.getId() + "] has invalid linked incoming node for type " + inType.getKey()));
}
}
for (Map.Entry<String, NodeAndType> outType: compositeNode.getLinkedOutgoingNodes().entrySet()) {
if (compositeNode.getOutgoingConnections(outType.getKey()).size() == 0) {
errors.add(new ProcessValidationErrorImpl(process,
"Composite node '" + node.getName() + "' [" + node.getId() + "] has no outgoing connection for type " + outType.getKey()));
}
if (outType.getValue().getNode() == null) {
errors.add(new ProcessValidationErrorImpl(process,
"Composite node '" + node.getName() + "' [" + node.getId() + "] has invalid linked outgoing node for type " + outType.getKey()));
}
}
validateNodes(compositeNode.getNodes(), errors, process);
} else if (node instanceof EventNode) {
final EventNode eventNode = (EventNode) node;
if (eventNode.getEventFilters().size() == 0) {
errors.add(new ProcessValidationErrorImpl(process,
"Event node '" + node.getName() + "' [" + node.getId() + "] should specify an event type"));
}
if (eventNode.getOutgoingConnections(org.drools.workflow.core.Node.CONNECTION_DEFAULT_TYPE).size() == 0) {
errors.add(new ProcessValidationErrorImpl(process,
"Event node '" + node.getName() + "' [" + node.getId() + "] has no outgoing connection"));
}
} else if (node instanceof FaultNode) {
endNodeFound = true;
final FaultNode faultNode = (FaultNode) node;
if (faultNode.getFrom() == null) {
errors.add(new ProcessValidationErrorImpl(process,
"Fault node '" + node.getName() + "' [" + node.getId() + "] has no incoming connection."));
}
if (faultNode.getFaultName() == null) {
errors.add(new ProcessValidationErrorImpl(process,
"Fault node '" + node.getName() + "' [" + node.getId() + "] has no fault name."));
}
}
}
}
private void checkAllNodesConnectedToStart(final RuleFlowProcess process,
final List<ProcessValidationError> errors) {
final Map<Node, Boolean> processNodes = new HashMap<Node, Boolean>();
final Node[] nodes = process.getNodes();
List<Node> eventNodes = new ArrayList<Node>();
for (int i = 0; i < nodes.length; i++) {
final Node node = nodes[i];
processNodes.put(node, Boolean.FALSE);
if (node instanceof EventNode) {
eventNodes.add(node);
}
}
final Node start = process.getStart();
if (start != null) {
processNode(start, processNodes);
}
for (Node eventNode: eventNodes) {
processNode(eventNode, processNodes);
}
for ( final Iterator<Node> it = processNodes.keySet().iterator(); it.hasNext(); ) {
final Node node = it.next();
if (Boolean.FALSE.equals(processNodes.get(node))) {
errors.add(new ProcessValidationErrorImpl(process,
"Node '" + node.getName() + "' [" + node.getId() + "] has no connection to the start node."));
}
}
}
private void processNode(final Node node, final Map<Node, Boolean> nodes) {
if (!nodes.containsKey(node) ) {
throw new IllegalStateException("A process node is connected with a node that does not belong to the process: " + node.getName());
}
final Boolean prevValue = (Boolean) nodes.put(node, Boolean.TRUE);
if (prevValue == Boolean.FALSE) {
for (final Iterator<List<Connection>> it = node.getOutgoingConnections().values().iterator(); it.hasNext(); ) {
final List<Connection> list = it.next();
for (final Iterator<Connection> it2 = list.iterator(); it2.hasNext(); ) {
processNode(it2.next().getTo(), nodes);
}
}
}
}
public ProcessValidationError[] validateProcess(Process process) {
if (!(process instanceof RuleFlowProcess)) {
throw new IllegalArgumentException(
"This validator can only validate ruleflow processes!");
}
return validateProcess((RuleFlowProcess) process);
}
}