Java tutorial
/* * Copyright 2012-2015 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 lodsve.core.condition; import org.springframework.util.ObjectUtils; /** * Outcome for a condition match, including log message. * * @author Phillip Webb */ public class ConditionOutcome { private final boolean match; private final String message; public ConditionOutcome(boolean match, String message) { this.match = match; this.message = message; } /** * Create a new {@link ConditionOutcome} instance for a 'match'. * * @return the {@link ConditionOutcome} */ public static ConditionOutcome match() { return match(null); } /** * Create a new {@link ConditionOutcome} instance for 'match'. * * @param message the message * @return the {@link ConditionOutcome} */ public static ConditionOutcome match(String message) { return new ConditionOutcome(true, message); } /** * Create a new {@link ConditionOutcome} instance for 'no match'. * * @param message the message * @return the {@link ConditionOutcome} */ public static ConditionOutcome noMatch(String message) { return new ConditionOutcome(false, message); } /** * Return {@code true} if the outcome was a match. * * @return {@code true} if the outcome matches */ public boolean isMatch() { return this.match; } /** * Return an outcome message or {@code null}. * * @return the message or {@code null} */ public String getMessage() { return this.message; } @Override public int hashCode() { return ObjectUtils.hashCode(this.match) * 31 + ObjectUtils.nullSafeHashCode(this.message); } @Override public boolean equals(Object obj) { if (this == obj) { return true; } if (obj == null) { return false; } if (getClass() == obj.getClass()) { ConditionOutcome other = (ConditionOutcome) obj; return (this.match == other.match && ObjectUtils.nullSafeEquals(this.message, other.message)); } return super.equals(obj); } @Override public String toString() { return (this.message == null ? "" : this.message); } /** * Return the inverse of the specified condition outcome. * * @param outcome the outcome to inverse * @return the inverse of the condition outcome * @since 1.3.0 */ public static ConditionOutcome inverse(ConditionOutcome outcome) { return new ConditionOutcome(!outcome.isMatch(), outcome.getMessage()); } }