/*
* Copyright 2015 the original author or authors.
*
* 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.springframework.statemachine.guard;
import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.Matchers.contains;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;
import java.util.EnumSet;
import java.util.HashMap;
import java.util.Map;
import org.junit.Test;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Configuration;
import org.springframework.expression.Expression;
import org.springframework.expression.spel.SpelCompilerMode;
import org.springframework.expression.spel.SpelParserConfiguration;
import org.springframework.expression.spel.standard.SpelExpressionParser;
import org.springframework.messaging.MessageHeaders;
import org.springframework.messaging.support.MessageBuilder;
import org.springframework.statemachine.AbstractStateMachineTests;
import org.springframework.statemachine.ObjectStateMachine;
import org.springframework.statemachine.StateMachineSystemConstants;
import org.springframework.statemachine.config.EnableStateMachine;
import org.springframework.statemachine.config.EnumStateMachineConfigurerAdapter;
import org.springframework.statemachine.config.builders.StateMachineStateConfigurer;
import org.springframework.statemachine.config.builders.StateMachineTransitionConfigurer;
import org.springframework.statemachine.support.DefaultStateContext;
/**
* Tests for using spel expressions in guards.
*
* @author Janne Valkealahti
*
*/
public class SpelExpressionGuardTests extends AbstractStateMachineTests {
@Test
public void testSimpleSpel() {
SpelExpressionParser parser = new SpelExpressionParser(
new SpelParserConfiguration(SpelCompilerMode.MIXED, null));
Expression expression = parser.parseExpression("messageHeaders.get('foo')=='bar'");
SpelExpressionGuard<TestStates, TestEvents> guard = new SpelExpressionGuard<TestStates, TestEvents>(expression);
Map<String, Object> map = new HashMap<String, Object>();
map.put("foo", "bar");
MessageHeaders headers = new MessageHeaders(map);
DefaultStateContext<TestStates, TestEvents> stateContext = new DefaultStateContext<TestStates, TestEvents>(null, null, headers,
null, null, null, null, null, null);
assertThat(guard.evaluate(stateContext), is(true));
}
@SuppressWarnings({ "unchecked" })
@Test
public void testGuardDenyStateChange() throws Exception {
AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext(BaseConfig.class, Config1.class);
assertTrue(ctx.containsBean(StateMachineSystemConstants.DEFAULT_ID_STATEMACHINE));
ObjectStateMachine<TestStates,TestEvents> machine =
ctx.getBean(StateMachineSystemConstants.DEFAULT_ID_STATEMACHINE, ObjectStateMachine.class);
machine.start();
assertThat(machine.getState().getIds(), contains(TestStates.S1));
machine.sendEvent(MessageBuilder.withPayload(TestEvents.E1).build());
assertThat(machine.getState().getIds(), contains(TestStates.S1));
ctx.close();
}
@Configuration
@EnableStateMachine
public static class Config1 extends EnumStateMachineConfigurerAdapter<TestStates, TestEvents> {
@Override
public void configure(StateMachineStateConfigurer<TestStates, TestEvents> states) throws Exception {
states
.withStates()
.initial(TestStates.S1)
.states(EnumSet.allOf(TestStates.class));
}
@Override
public void configure(StateMachineTransitionConfigurer<TestStates, TestEvents> transitions) throws Exception {
transitions
.withExternal()
.source(TestStates.S1)
.target(TestStates.S2)
.event(TestEvents.E1)
.guardExpression("false");
}
}
}