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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 com.datastax.oss.driver.internal.core.type.codec;
import com.datastax.oss.driver.api.core.ProtocolVersion;
import com.datastax.oss.driver.api.core.type.DataType;
import com.datastax.oss.driver.api.core.type.codec.TypeCodec;
import com.datastax.oss.driver.api.core.type.reflect.GenericType;
import com.datastax.oss.driver.internal.core.util.Strings;
import edu.umd.cs.findbugs.annotations.NonNull;
import edu.umd.cs.findbugs.annotations.Nullable;
import com.datastax.oss.driver.shaded.netty.util.concurrent.FastThreadLocal;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.CharacterCodingException;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CharsetEncoder;
import java.nio.charset.CodingErrorAction;
import net.jcip.annotations.ThreadSafe;
@ThreadSafe
public class StringCodec implements TypeCodec {
private final DataType cqlType;
private final FastThreadLocal charsetEncoder;
private final FastThreadLocal charsetDecoder;
public StringCodec(@NonNull DataType cqlType, @NonNull Charset charset) {
this.cqlType = cqlType;
charsetEncoder =
new FastThreadLocal() {
@Override
protected CharsetEncoder initialValue() throws Exception {
return charset
.newEncoder()
.onMalformedInput(CodingErrorAction.REPORT)
.onUnmappableCharacter(CodingErrorAction.REPORT);
}
};
charsetDecoder =
new FastThreadLocal() {
@Override
protected CharsetDecoder initialValue() throws Exception {
return charset
.newDecoder()
.onMalformedInput(CodingErrorAction.REPORT)
.onUnmappableCharacter(CodingErrorAction.REPORT);
}
};
}
@NonNull
@Override
public GenericType getJavaType() {
return GenericType.STRING;
}
@NonNull
@Override
public DataType getCqlType() {
return cqlType;
}
@Override
public boolean accepts(@NonNull Object value) {
return value instanceof String;
}
@Override
public boolean accepts(@NonNull Class javaClass) {
return javaClass == String.class;
}
@Nullable
@Override
public ByteBuffer encode(@Nullable String value, @NonNull ProtocolVersion protocolVersion) {
if (value == null) {
return null;
}
try {
return charsetEncoder.get().encode(CharBuffer.wrap(value));
} catch (CharacterCodingException e) {
throw new IllegalArgumentException(e);
}
}
@Nullable
@Override
public String decode(@Nullable ByteBuffer bytes, @NonNull ProtocolVersion protocolVersion) {
if (bytes == null) {
return null;
} else if (bytes.remaining() == 0) {
return "";
} else {
try {
return charsetDecoder.get().decode(bytes.duplicate()).toString();
} catch (CharacterCodingException e) {
throw new IllegalArgumentException(e);
}
}
}
@NonNull
@Override
public String format(@Nullable String value) {
return (value == null) ? "NULL" : Strings.quote(value);
}
@Nullable
@Override
public String parse(String value) {
if (value == null || value.isEmpty() || value.equalsIgnoreCase("NULL")) {
return null;
} else if (!Strings.isQuoted(value)) {
throw new IllegalArgumentException(
"text or varchar values must be enclosed by single quotes");
} else {
return Strings.unquote(value);
}
}
}