kafka ResourcePatternFilter 源码
kafka ResourcePatternFilter 代码
文件路径:/clients/src/main/java/org/apache/kafka/common/resource/ResourcePatternFilter.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.kafka.common.resource;
import org.apache.kafka.common.annotation.InterfaceStability;
import java.util.Objects;
import static org.apache.kafka.common.resource.ResourcePattern.WILDCARD_RESOURCE;
/**
* Represents a filter that can match {@link ResourcePattern}.
* <p>
* The API for this class is still evolving and we may break compatibility in minor releases, if necessary.
*/
@InterfaceStability.Evolving
public class ResourcePatternFilter {
/**
* Matches any resource pattern.
*/
public static final ResourcePatternFilter ANY = new ResourcePatternFilter(ResourceType.ANY, null, PatternType.ANY);
private final ResourceType resourceType;
private final String name;
private final PatternType patternType;
/**
* Create a filter using the supplied parameters.
*
* @param resourceType non-null resource type.
* If {@link ResourceType#ANY}, the filter will ignore the resource type of the pattern.
* If any other resource type, the filter will match only patterns with the same type.
* @param name resource name or {@code null}.
* If {@code null}, the filter will ignore the name of resources.
* If {@link ResourcePattern#WILDCARD_RESOURCE}, will match only wildcard patterns.
* @param patternType non-null resource pattern type.
* If {@link PatternType#ANY}, the filter will match patterns regardless of pattern type.
* If {@link PatternType#MATCH}, the filter will match patterns that would match the supplied
* {@code name}, including a matching prefixed and wildcards patterns.
* If any other resource pattern type, the filter will match only patterns with the same type.
*/
public ResourcePatternFilter(ResourceType resourceType, String name, PatternType patternType) {
this.resourceType = Objects.requireNonNull(resourceType, "resourceType");
this.name = name;
this.patternType = Objects.requireNonNull(patternType, "patternType");
}
/**
* @return {@code true} if this filter has any UNKNOWN components.
*/
public boolean isUnknown() {
return resourceType.isUnknown() || patternType.isUnknown();
}
/**
* @return the specific resource type this pattern matches
*/
public ResourceType resourceType() {
return resourceType;
}
/**
* @return the resource name.
*/
public String name() {
return name;
}
/**
* @return the resource pattern type.
*/
public PatternType patternType() {
return patternType;
}
/**
* @return {@code true} if this filter matches the given pattern.
*/
public boolean matches(ResourcePattern pattern) {
if (!resourceType.equals(ResourceType.ANY) && !resourceType.equals(pattern.resourceType())) {
return false;
}
if (!patternType.equals(PatternType.ANY) && !patternType.equals(PatternType.MATCH) && !patternType.equals(pattern.patternType())) {
return false;
}
if (name == null) {
return true;
}
if (patternType.equals(PatternType.ANY) || patternType.equals(pattern.patternType())) {
return name.equals(pattern.name());
}
switch (pattern.patternType()) {
case LITERAL:
return name.equals(pattern.name()) || pattern.name().equals(WILDCARD_RESOURCE);
case PREFIXED:
return name.startsWith(pattern.name());
default:
throw new IllegalArgumentException("Unsupported PatternType: " + pattern.patternType());
}
}
/**
* @return {@code true} if this filter could only match one pattern.
* In other words, if there are no ANY or UNKNOWN fields.
*/
public boolean matchesAtMostOne() {
return findIndefiniteField() == null;
}
/**
* @return a string describing any ANY or UNKNOWN field, or null if there is no such field.
*/
public String findIndefiniteField() {
if (resourceType == ResourceType.ANY)
return "Resource type is ANY.";
if (resourceType == ResourceType.UNKNOWN)
return "Resource type is UNKNOWN.";
if (name == null)
return "Resource name is NULL.";
if (patternType == PatternType.MATCH)
return "Resource pattern type is MATCH.";
if (patternType == PatternType.UNKNOWN)
return "Resource pattern type is UNKNOWN.";
return null;
}
@Override
public String toString() {
return "ResourcePattern(resourceType=" + resourceType + ", name=" + ((name == null) ? "<any>" : name) + ", patternType=" + patternType + ")";
}
@Override
public boolean equals(Object o) {
if (this == o)
return true;
if (o == null || getClass() != o.getClass())
return false;
final ResourcePatternFilter resource = (ResourcePatternFilter) o;
return resourceType == resource.resourceType &&
Objects.equals(name, resource.name) &&
patternType == resource.patternType;
}
@Override
public int hashCode() {
return Objects.hash(resourceType, name, patternType);
}
}
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