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/*
* Copyright 2006-2007 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.batch.core.job.flow.support;
import org.springframework.batch.core.ExitStatus;
import org.springframework.batch.core.job.flow.State;
import org.springframework.batch.support.PatternMatcher;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
/**
* Value object representing a potential transition from one {@link State} to
* another. The originating State name and the next {@link State} to execute are
* linked by a pattern for the {@link ExitStatus#getExitCode() exit code} of an
* execution of the originating State.
*
* @author Dave Syer
* @since 2.0
*/
public class StateTransition implements Comparable {
private final State state;
private final String pattern;
private final String next;
/**
* Create a new end state {@link StateTransition} specification. This
* transition explicitly goes unconditionally to an end state (i.e. no more
* executions).
*
* @param state the {@link State} used to generate the outcome for this
* transition
*/
public static StateTransition createEndStateTransition(State state) {
return createStateTransition(state, null, null);
}
/**
* Create a new end state {@link StateTransition} specification. This
* transition explicitly goes to an end state (i.e. no more processing) if
* the outcome matches the pattern.
*
* @param state the {@link State} used to generate the outcome for this
* transition
* @param pattern the pattern to match in the exit status of the
* {@link State}
*/
public static StateTransition createEndStateTransition(State state, String pattern) {
return createStateTransition(state, pattern, null);
}
/**
* Create a new state {@link StateTransition} specification with a wildcard
* pattern that matches all outcomes.
*
* @param state the {@link State} used to generate the outcome for this
* transition
* @param next the name of the next {@link State} to execute
*/
public static StateTransition createStateTransition(State state, String next) {
return createStateTransition(state, null, next);
}
/**
* Create a new {@link StateTransition} specification from one {@link State}
* to another (by name).
*
* @param state the {@link State} used to generate the outcome for this
* transition
* @param pattern the pattern to match in the exit status of the
* {@link State}
* @param next the name of the next {@link State} to execute
*/
public static StateTransition createStateTransition(State state, String pattern, String next) {
return new StateTransition(state, pattern, next);
}
private StateTransition(State state, String pattern, String next) {
super();
if (!StringUtils.hasText(pattern)) {
this.pattern = "*";
}
else {
this.pattern = pattern;
}
Assert.notNull(state, "A state is required for a StateTransition");
if (state.isEndState() && StringUtils.hasText(next)) {
throw new IllegalStateException("End state cannot have next: "+state);
}
this.next = next;
this.state = state;
}
/**
* Public getter for the State.
* @return the State
*/
public State getState() {
return state;
}
/**
* Public getter for the next State name.
* @return the next
*/
public String getNext() {
return next;
}
/**
* Check if the provided status matches the pattern, signalling that the
* next State should be executed.
*
* @param status the status to compare
* @return true if the pattern matches this status
*/
public boolean matches(String status) {
return PatternMatcher.match(pattern, status);
}
/**
* Check for a special next State signalling the end of a job.
*
* @return true if this transition goes nowhere (there is no next)
*/
public boolean isEnd() {
return next == null;
}
/**
* Sorts by decreasing specificity of pattern, based on just counting
* wildcards (with * taking precedence over ?). If wildcard counts are equal
* then falls back to alphabetic comparison. Hence * > foo* > ??? >
* fo? > foo.
* @see Comparable#compareTo(Object)
*/
public int compareTo(StateTransition other) {
String value = other.pattern;
if (pattern.equals(value)) {
return 0;
}
int patternCount = StringUtils.countOccurrencesOf(pattern, "*");
int valueCount = StringUtils.countOccurrencesOf(value, "*");
if (patternCount > valueCount) {
return 1;
}
if (patternCount < valueCount) {
return -1;
}
patternCount = StringUtils.countOccurrencesOf(pattern, "?");
valueCount = StringUtils.countOccurrencesOf(value, "?");
if (patternCount > valueCount) {
return 1;
}
if (patternCount < valueCount) {
return -1;
}
return pattern.compareTo(value);
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
return String.format("StateTransition: [state=%s, pattern=%s, next=%s]", state == null ? null : state.getName(),
pattern, next);
}
}