| /* |
| * 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.cassandra.serializers; |
| |
| import org.apache.cassandra.db.marshal.ValueAccessor; |
| import org.apache.cassandra.utils.ByteBufferUtil; |
| |
| import java.math.BigDecimal; |
| import java.math.BigInteger; |
| import java.nio.ByteBuffer; |
| |
| public class DecimalSerializer extends TypeSerializer<BigDecimal> |
| { |
| public static final DecimalSerializer instance = new DecimalSerializer(); |
| |
| public <V> BigDecimal deserialize(V value, ValueAccessor<V> accessor) |
| { |
| if (value == null || accessor.isEmpty(value)) |
| return null; |
| |
| // do not consume the contents of the ByteBuffer |
| int scale = accessor.getInt(value, 0); |
| BigInteger bi = new BigInteger(accessor.toArray(value, 4, accessor.size(value) - 4)); |
| return new BigDecimal(bi, scale); |
| } |
| |
| public ByteBuffer serialize(BigDecimal value) |
| { |
| if (value == null) |
| return ByteBufferUtil.EMPTY_BYTE_BUFFER; |
| |
| 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; |
| } |
| |
| public <T> void validate(T value, ValueAccessor<T> accessor) throws MarshalException |
| { |
| // We at least store the scale. |
| if (!accessor.isEmpty(value) && accessor.size(value) < 4) |
| throw new MarshalException(String.format("Expected 0 or at least 4 bytes (%d)", accessor.size(value))); |
| } |
| |
| public String toString(BigDecimal value) |
| { |
| return value == null ? "" : value.toString(); |
| } |
| |
| public Class<BigDecimal> getType() |
| { |
| return BigDecimal.class; |
| } |
| } |