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/*
* Copyright 2002-2021 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
*
* https://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.messaging.handler;
import java.util.Collection;
import java.util.StringJoiner;
import org.springframework.lang.Nullable;
/**
* Base class for {@code MessageCondition's} that pre-declares abstract methods
* {@link #getContent()} and {@link #getToStringInfix()} in order to provide
* implementations of {@link #equals(Object)}, {@link #hashCode()}, and
* {@link #toString()}.
*
* @author Rossen Stoyanchev
* @since 4.0
* @param the kind of condition that this condition can be combined with or compared to
*/
public abstract class AbstractMessageCondition> implements MessageCondition {
@Override
public boolean equals(@Nullable Object other) {
if (this == other) {
return true;
}
if (other == null || getClass() != other.getClass()) {
return false;
}
return getContent().equals(((AbstractMessageCondition) other).getContent());
}
@Override
public int hashCode() {
return getContent().hashCode();
}
@Override
public String toString() {
StringJoiner joiner = new StringJoiner(getToStringInfix(), "[", "]");
for (Object expression : getContent()) {
joiner.add(expression.toString());
}
return joiner.toString();
}
/**
* Return the collection of objects the message condition is composed of
* (for example, destination patterns), never {@code null}.
*/
protected abstract Collection getContent();
/**
* The notation to use when printing discrete items of content.
* For example " || " for URL patterns or " && " for param expressions.
*/
protected abstract String getToStringInfix();
}