org.apache.pulsar.client.impl.schema.StringSchema Maven / Gradle / Ivy
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* 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.pulsar.client.impl.schema;
import static org.apache.pulsar.shade.com.google.common.base.Preconditions.checkArgument;
import org.apache.pulsar.shade.io.netty.buffer.ByteBuf;
import org.apache.pulsar.shade.io.netty.util.concurrent.FastThreadLocal;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Map;
import org.apache.pulsar.common.schema.SchemaInfo;
import org.apache.pulsar.common.schema.SchemaType;
/**
* Schema definition for Strings encoded in UTF-8 format.
*/
public class StringSchema extends AbstractSchema {
static final String CHARSET_KEY;
private static final SchemaInfo DEFAULT_SCHEMA_INFO;
private static final Charset DEFAULT_CHARSET;
private static final StringSchema UTF8;
static {
// Ensure the ordering of the static initialization
CHARSET_KEY = "__charset";
DEFAULT_CHARSET = StandardCharsets.UTF_8;
DEFAULT_SCHEMA_INFO = SchemaInfoImpl.builder()
.name("String")
.type(SchemaType.STRING)
.schema(new byte[0]).build();
UTF8 = new StringSchema(StandardCharsets.UTF_8);
}
private static final FastThreadLocal tmpBuffer = new FastThreadLocal() {
@Override
protected byte[] initialValue() {
return new byte[1024];
}
};
public static StringSchema fromSchemaInfo(SchemaInfo schemaInfo) {
checkArgument(SchemaType.STRING == schemaInfo.getType(), "Not a string schema");
String charsetName = schemaInfo.getProperties().get(CHARSET_KEY);
if (null == charsetName) {
return UTF8;
} else {
return new StringSchema(Charset.forName(charsetName));
}
}
public static StringSchema utf8() {
return UTF8;
}
private final Charset charset;
private final SchemaInfo schemaInfo;
public StringSchema() {
this.charset = DEFAULT_CHARSET;
this.schemaInfo = DEFAULT_SCHEMA_INFO;
}
public StringSchema(Charset charset) {
this.charset = charset;
Map properties = new HashMap<>();
properties.put(CHARSET_KEY, charset.name());
this.schemaInfo = SchemaInfoImpl.builder()
.name(DEFAULT_SCHEMA_INFO.getName())
.type(SchemaType.STRING)
.schema(DEFAULT_SCHEMA_INFO.getSchema())
.properties(properties)
.build();
}
public byte[] encode(String message) {
if (null == message) {
return null;
} else {
return message.getBytes(charset);
}
}
public String decode(byte[] bytes) {
if (null == bytes) {
return null;
} else {
return new String(bytes, charset);
}
}
public String decode(ByteBuf byteBuf) {
if (null == byteBuf) {
return null;
} else {
int size = byteBuf.readableBytes();
byte[] bytes = tmpBuffer.get();
if (size > bytes.length) {
bytes = new byte[size * 2];
tmpBuffer.set(bytes);
}
byteBuf.getBytes(byteBuf.readerIndex(), bytes, 0, size);
return new String(bytes, 0, size, charset);
}
}
public SchemaInfo getSchemaInfo() {
return schemaInfo;
}
}