com.datastax.oss.driver.internal.core.type.codec.DecimalCodec 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 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.DataTypes;
import com.datastax.oss.driver.api.core.type.codec.TypeCodec;
import com.datastax.oss.driver.api.core.type.reflect.GenericType;
import edu.umd.cs.findbugs.annotations.NonNull;
import edu.umd.cs.findbugs.annotations.Nullable;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.nio.ByteBuffer;
import net.jcip.annotations.ThreadSafe;
@ThreadSafe
public class DecimalCodec implements TypeCodec {
@NonNull
@Override
public GenericType getJavaType() {
return GenericType.BIG_DECIMAL;
}
@NonNull
@Override
public DataType getCqlType() {
return DataTypes.DECIMAL;
}
@Override
public boolean accepts(@NonNull Object value) {
return value instanceof BigDecimal;
}
@Override
public boolean accepts(@NonNull Class javaClass) {
return BigDecimal.class.isAssignableFrom(javaClass);
}
@Nullable
@Override
public ByteBuffer encode(@Nullable BigDecimal value, @NonNull ProtocolVersion protocolVersion) {
if (value == null) {
return null;
}
BigInteger bi = value.unscaledValue();
int scale = value.scale();
byte[] bibytes = bi.toByteArray();
ByteBuffer bytes = ByteBuffer.allocate(4 + bibytes.length);
bytes.putInt(scale);
bytes.put(bibytes);
bytes.rewind();
return bytes;
}
@Nullable
@Override
public BigDecimal decode(@Nullable ByteBuffer bytes, @NonNull ProtocolVersion protocolVersion) {
if (bytes == null || bytes.remaining() == 0) {
return null;
} else if (bytes.remaining() < 4) {
throw new IllegalArgumentException(
"Invalid decimal value, expecting at least 4 bytes but got " + bytes.remaining());
}
bytes = bytes.duplicate();
int scale = bytes.getInt();
byte[] bibytes = new byte[bytes.remaining()];
bytes.get(bibytes);
BigInteger bi = new BigInteger(bibytes);
return new BigDecimal(bi, scale);
}
@NonNull
@Override
public String format(@Nullable BigDecimal value) {
return (value == null) ? "NULL" : value.toString();
}
@Nullable
@Override
public BigDecimal parse(@Nullable String value) {
try {
return (value == null || value.isEmpty() || value.equalsIgnoreCase("NULL"))
? null
: new BigDecimal(value);
} catch (NumberFormatException e) {
throw new IllegalArgumentException(
String.format("Cannot parse decimal value from \"%s\"", value));
}
}
}