| /* |
| * 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.db.marshal; |
| |
| import java.nio.ByteBuffer; |
| import java.util.*; |
| |
| import org.apache.cassandra.cql3.Json; |
| import org.apache.cassandra.cql3.Sets; |
| import org.apache.cassandra.cql3.Term; |
| import org.apache.cassandra.db.rows.Cell; |
| import org.apache.cassandra.exceptions.ConfigurationException; |
| import org.apache.cassandra.exceptions.SyntaxException; |
| import org.apache.cassandra.serializers.MarshalException; |
| import org.apache.cassandra.serializers.SetSerializer; |
| import org.apache.cassandra.transport.ProtocolVersion; |
| |
| public class SetType<T> extends CollectionType<Set<T>> |
| { |
| // interning instances |
| private static final Map<AbstractType<?>, SetType> instances = new HashMap<>(); |
| private static final Map<AbstractType<?>, SetType> frozenInstances = new HashMap<>(); |
| |
| private final AbstractType<T> elements; |
| private final SetSerializer<T> serializer; |
| private final boolean isMultiCell; |
| |
| public static SetType<?> getInstance(TypeParser parser) throws ConfigurationException, SyntaxException |
| { |
| List<AbstractType<?>> l = parser.getTypeParameters(); |
| if (l.size() != 1) |
| throw new ConfigurationException("SetType takes exactly 1 type parameter"); |
| |
| return getInstance(l.get(0), true); |
| } |
| |
| public static synchronized <T> SetType<T> getInstance(AbstractType<T> elements, boolean isMultiCell) |
| { |
| Map<AbstractType<?>, SetType> internMap = isMultiCell ? instances : frozenInstances; |
| SetType<T> t = internMap.get(elements); |
| if (t == null) |
| { |
| t = new SetType<T>(elements, isMultiCell); |
| internMap.put(elements, t); |
| } |
| return t; |
| } |
| |
| public SetType(AbstractType<T> elements, boolean isMultiCell) |
| { |
| super(ComparisonType.CUSTOM, Kind.SET); |
| this.elements = elements; |
| this.serializer = SetSerializer.getInstance(elements.getSerializer(), elements); |
| this.isMultiCell = isMultiCell; |
| } |
| |
| @Override |
| public boolean referencesUserType(String userTypeName) |
| { |
| return getElementsType().referencesUserType(userTypeName); |
| } |
| |
| public AbstractType<T> getElementsType() |
| { |
| return elements; |
| } |
| |
| public AbstractType<T> nameComparator() |
| { |
| return elements; |
| } |
| |
| public AbstractType<?> valueComparator() |
| { |
| return EmptyType.instance; |
| } |
| |
| @Override |
| public boolean isMultiCell() |
| { |
| return isMultiCell; |
| } |
| |
| @Override |
| public AbstractType<?> freeze() |
| { |
| if (isMultiCell) |
| return getInstance(this.elements, false); |
| else |
| return this; |
| } |
| |
| @Override |
| public AbstractType<?> freezeNestedMulticellTypes() |
| { |
| if (!isMultiCell()) |
| return this; |
| |
| if (elements.isFreezable() && elements.isMultiCell()) |
| return getInstance(elements.freeze(), isMultiCell); |
| |
| return getInstance(elements.freezeNestedMulticellTypes(), isMultiCell); |
| } |
| |
| @Override |
| public boolean isCompatibleWithFrozen(CollectionType<?> previous) |
| { |
| assert !isMultiCell; |
| return this.elements.isCompatibleWith(((SetType) previous).elements); |
| } |
| |
| @Override |
| public boolean isValueCompatibleWithFrozen(CollectionType<?> previous) |
| { |
| // because sets are ordered, any changes to the type must maintain the ordering |
| return isCompatibleWithFrozen(previous); |
| } |
| |
| @Override |
| public int compareCustom(ByteBuffer o1, ByteBuffer o2) |
| { |
| return ListType.compareListOrSet(elements, o1, o2); |
| } |
| |
| public SetSerializer<T> getSerializer() |
| { |
| return serializer; |
| } |
| |
| @Override |
| public String toString(boolean ignoreFreezing) |
| { |
| boolean includeFrozenType = !ignoreFreezing && !isMultiCell(); |
| |
| StringBuilder sb = new StringBuilder(); |
| if (includeFrozenType) |
| sb.append(FrozenType.class.getName()).append("("); |
| sb.append(getClass().getName()); |
| sb.append(TypeParser.stringifyTypeParameters(Collections.<AbstractType<?>>singletonList(elements), ignoreFreezing || !isMultiCell)); |
| if (includeFrozenType) |
| sb.append(")"); |
| return sb.toString(); |
| } |
| |
| public List<ByteBuffer> serializedValues(Iterator<Cell> cells) |
| { |
| List<ByteBuffer> bbs = new ArrayList<ByteBuffer>(); |
| while (cells.hasNext()) |
| bbs.add(cells.next().path().get(0)); |
| return bbs; |
| } |
| |
| @Override |
| public Term fromJSONObject(Object parsed) throws MarshalException |
| { |
| if (parsed instanceof String) |
| parsed = Json.decodeJson((String) parsed); |
| |
| if (!(parsed instanceof List)) |
| throw new MarshalException(String.format( |
| "Expected a list (representing a set), but got a %s: %s", parsed.getClass().getSimpleName(), parsed)); |
| |
| List list = (List) parsed; |
| Set<Term> terms = new HashSet<>(list.size()); |
| for (Object element : list) |
| { |
| if (element == null) |
| throw new MarshalException("Invalid null element in set"); |
| terms.add(elements.fromJSONObject(element)); |
| } |
| |
| return new Sets.DelayedValue(elements, terms); |
| } |
| |
| @Override |
| public String toJSONString(ByteBuffer buffer, ProtocolVersion protocolVersion) |
| { |
| return ListType.setOrListToJsonString(buffer, elements, protocolVersion); |
| } |
| } |