/
Switch.java
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/
Switch.java
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/*
* Copyright 2022 Conductor Authors.
* <p>
* 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
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* 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 com.netflix.conductor.sdk.workflow.def.tasks;
import java.util.*;
import com.netflix.conductor.common.metadata.tasks.TaskType;
import com.netflix.conductor.common.metadata.workflow.WorkflowTask;
/** Switch Task */
public class Switch extends Task<Switch> {
public static final String VALUE_PARAM_NAME = "value-param";
public static final String JAVASCRIPT_NAME = "javascript";
private String caseExpression;
private boolean useJavascript;
private List<Task<?>> defaultTasks = new ArrayList<>();
private Map<String, List<Task<?>>> branches = new HashMap<>();
/**
* Switch case (similar to if...then...else or switch in java language)
*
* @param taskReferenceName
* @param caseExpression An expression that outputs a string value to be used as case branches.
* Case expression can be a support value parameter e.g. ${workflow.input.key} or
* ${task.output.key} or a Javascript statement.
* @param useJavascript set to true if the caseExpression is a javascript statement
*/
public Switch(String taskReferenceName, String caseExpression, boolean useJavascript) {
super(taskReferenceName, TaskType.SWITCH);
this.caseExpression = caseExpression;
this.useJavascript = useJavascript;
}
/**
* Switch case (similar to if...then...else or switch in java language)
*
* @param taskReferenceName
* @param caseExpression
*/
public Switch(String taskReferenceName, String caseExpression) {
super(taskReferenceName, TaskType.SWITCH);
this.caseExpression = caseExpression;
this.useJavascript = false;
}
Switch(WorkflowTask workflowTask) {
super(workflowTask);
Map<String, List<WorkflowTask>> decisions = workflowTask.getDecisionCases();
decisions.entrySet().stream()
.forEach(
branch -> {
String branchName = branch.getKey();
List<WorkflowTask> branchWorkflowTasks = branch.getValue();
List<Task<?>> branchTasks = new ArrayList<>();
for (WorkflowTask branchWorkflowTask : branchWorkflowTasks) {
branchTasks.add(TaskRegistry.getTask(branchWorkflowTask));
}
this.branches.put(branchName, branchTasks);
});
List<WorkflowTask> defaultCases = workflowTask.getDefaultCase();
for (WorkflowTask defaultCase : defaultCases) {
this.defaultTasks.add(TaskRegistry.getTask(defaultCase));
}
}
public Switch defaultCase(Task<?>... tasks) {
defaultTasks = Arrays.asList(tasks);
return this;
}
public Switch defaultCase(List<Task<?>> defaultTasks) {
this.defaultTasks = defaultTasks;
return this;
}
public Switch decisionCases(Map<String, List<Task<?>>> branches) {
this.branches = branches;
return this;
}
public Switch defaultCase(String... workerTasks) {
for (String workerTask : workerTasks) {
this.defaultTasks.add(new SimpleTask(workerTask, workerTask));
}
return this;
}
public Switch switchCase(String caseValue, Task... tasks) {
branches.put(caseValue, Arrays.asList(tasks));
return this;
}
public Switch switchCase(String caseValue, String... workerTasks) {
List<Task<?>> tasks = new ArrayList<>(workerTasks.length);
int i = 0;
for (String workerTask : workerTasks) {
tasks.add(new SimpleTask(workerTask, workerTask));
}
branches.put(caseValue, tasks);
return this;
}
public List<Task<?>> getDefaultTasks() {
return defaultTasks;
}
public Map<String, List<Task<?>>> getBranches() {
return branches;
}
@Override
public void updateWorkflowTask(WorkflowTask workflowTask) {
if (useJavascript) {
workflowTask.setEvaluatorType(JAVASCRIPT_NAME);
workflowTask.setExpression(caseExpression);
} else {
workflowTask.setEvaluatorType(VALUE_PARAM_NAME);
workflowTask.getInputParameters().put("switchCaseValue", caseExpression);
workflowTask.setExpression("switchCaseValue");
}
Map<String, List<WorkflowTask>> decisionCases = new HashMap<>();
branches.entrySet()
.forEach(
entry -> {
String decisionCase = entry.getKey();
List<Task<?>> decisionTasks = entry.getValue();
List<WorkflowTask> decionTaskDefs =
new ArrayList<>(decisionTasks.size());
for (Task<?> decisionTask : decisionTasks) {
decionTaskDefs.addAll(decisionTask.getWorkflowDefTasks());
}
decisionCases.put(decisionCase, decionTaskDefs);
});
workflowTask.setDecisionCases(decisionCases);
List<WorkflowTask> defaultCaseTaskDefs = new ArrayList<>(defaultTasks.size());
for (Task<?> defaultTask : defaultTasks) {
defaultCaseTaskDefs.addAll(defaultTask.getWorkflowDefTasks());
}
workflowTask.setDefaultCase(defaultCaseTaskDefs);
}
}