| /* |
| * 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 java.io.IOException; |
| import java.nio.ByteBuffer; |
| |
| import org.apache.cassandra.cql3.Duration; |
| import org.apache.cassandra.db.marshal.ValueAccessor; |
| import org.apache.cassandra.io.util.DataInputBuffer; |
| import org.apache.cassandra.io.util.DataOutputBufferFixed; |
| import org.apache.cassandra.utils.ByteBufferUtil; |
| import org.apache.cassandra.utils.vint.VIntCoding; |
| |
| public final class DurationSerializer extends TypeSerializer<Duration> |
| { |
| public static final DurationSerializer instance = new DurationSerializer(); |
| |
| public ByteBuffer serialize(Duration duration) |
| { |
| if (duration == null) |
| return ByteBufferUtil.EMPTY_BYTE_BUFFER; |
| |
| long months = duration.getMonths(); |
| long days = duration.getDays(); |
| long nanoseconds = duration.getNanoseconds(); |
| |
| int size = VIntCoding.computeVIntSize(months) |
| + VIntCoding.computeVIntSize(days) |
| + VIntCoding.computeVIntSize(nanoseconds); |
| |
| try (DataOutputBufferFixed output = new DataOutputBufferFixed(size)) |
| { |
| output.writeVInt(months); |
| output.writeVInt(days); |
| output.writeVInt(nanoseconds); |
| return output.buffer(); |
| } |
| catch (IOException e) |
| { |
| // this should never happen with a DataOutputBufferFixed |
| throw new AssertionError("Unexpected error", e); |
| } |
| } |
| |
| public <V> Duration deserialize(V value, ValueAccessor<V> accessor) |
| { |
| if (accessor.isEmpty(value)) |
| return null; |
| |
| try (DataInputBuffer in = new DataInputBuffer(accessor.toBuffer(value), true)) // TODO: make a value input buffer |
| { |
| int months = (int) in.readVInt(); |
| int days = (int) in.readVInt(); |
| long nanoseconds = in.readVInt(); |
| return Duration.newInstance(months, days, nanoseconds); |
| } |
| catch (IOException e) |
| { |
| // this should never happen with a DataInputBuffer |
| throw new AssertionError("Unexpected error", e); |
| } |
| } |
| |
| public <V> void validate(V value, ValueAccessor<V> accessor) throws MarshalException |
| { |
| if (accessor.size(value) < 3) |
| throw new MarshalException(String.format("Expected at least 3 bytes for a duration (%d)", accessor.size(value))); |
| |
| try (DataInputBuffer in = new DataInputBuffer(accessor.toBuffer(value), true)) // FIXME: value input buffer |
| { |
| long monthsAsLong = in.readVInt(); |
| long daysAsLong = in.readVInt(); |
| long nanoseconds = in.readVInt(); |
| |
| if (!canBeCastToInt(monthsAsLong)) |
| throw new MarshalException(String.format("The duration months must be a 32 bits integer but was: %d", |
| monthsAsLong)); |
| if (!canBeCastToInt(daysAsLong)) |
| throw new MarshalException(String.format("The duration days must be a 32 bits integer but was: %d", |
| daysAsLong)); |
| int months = (int) monthsAsLong; |
| int days = (int) daysAsLong; |
| |
| if (!((months >= 0 && days >= 0 && nanoseconds >= 0) || (months <= 0 && days <=0 && nanoseconds <=0))) |
| throw new MarshalException(String.format("The duration months, days and nanoseconds must be all of the same sign (%d, %d, %d)", |
| months, days, nanoseconds)); |
| } |
| catch (IOException e) |
| { |
| // this should never happen with a DataInputBuffer |
| throw new AssertionError("Unexpected error", e); |
| } |
| } |
| |
| /** |
| * Checks that the specified {@code long} can be cast to an {@code int} without information lost. |
| * |
| * @param l the {@code long} to check |
| * @return {@code true} if the specified {@code long} can be cast to an {@code int} without information lost, |
| * {@code false} otherwise. |
| */ |
| private boolean canBeCastToInt(long l) |
| { |
| return ((int) l) == l; |
| } |
| |
| public String toString(Duration duration) |
| { |
| return duration == null ? "" : duration.toString(); |
| } |
| |
| public Class<Duration> getType() |
| { |
| return Duration.class; |
| } |
| } |