kafka ConnectHeader 源码
kafka ConnectHeader 代码
文件路径:/connect/api/src/main/java/org/apache/kafka/connect/header/ConnectHeader.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.connect.header;
import org.apache.kafka.connect.data.Schema;
import org.apache.kafka.connect.data.SchemaAndValue;
import org.apache.kafka.connect.data.Struct;
import java.util.Objects;
/**
* A {@link Header} implementation.
*/
class ConnectHeader implements Header {
private static final SchemaAndValue NULL_SCHEMA_AND_VALUE = new SchemaAndValue(null, null);
private final String key;
private final SchemaAndValue schemaAndValue;
protected ConnectHeader(String key, SchemaAndValue schemaAndValue) {
Objects.requireNonNull(key, "Null header keys are not permitted");
this.key = key;
this.schemaAndValue = schemaAndValue != null ? schemaAndValue : NULL_SCHEMA_AND_VALUE;
}
@Override
public String key() {
return key;
}
@Override
public Object value() {
return schemaAndValue.value();
}
@Override
public Schema schema() {
Schema schema = schemaAndValue.schema();
if (schema == null && value() instanceof Struct) {
schema = ((Struct) value()).schema();
}
return schema;
}
@Override
public Header rename(String key) {
Objects.requireNonNull(key, "Null header keys are not permitted");
if (this.key.equals(key)) {
return this;
}
return new ConnectHeader(key, schemaAndValue);
}
@Override
public Header with(Schema schema, Object value) {
return new ConnectHeader(key, new SchemaAndValue(schema, value));
}
@Override
public int hashCode() {
return Objects.hash(key, schemaAndValue);
}
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (obj instanceof Header) {
Header that = (Header) obj;
return Objects.equals(this.key, that.key()) && Objects.equals(this.schema(), that.schema()) && Objects.equals(this.value(),
that.value());
}
return false;
}
@Override
public String toString() {
return "ConnectHeader(key=" + key + ", value=" + value() + ", schema=" + schema() + ")";
}
}
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