| /* |
| * 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.Maps; |
| 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.CollectionSerializer; |
| import org.apache.cassandra.serializers.MarshalException; |
| import org.apache.cassandra.serializers.MapSerializer; |
| import org.apache.cassandra.transport.ProtocolVersion; |
| import org.apache.cassandra.utils.Pair; |
| |
| public class MapType<K, V> extends CollectionType<Map<K, V>> |
| { |
| // interning instances |
| private static final Map<Pair<AbstractType<?>, AbstractType<?>>, MapType> instances = new HashMap<>(); |
| private static final Map<Pair<AbstractType<?>, AbstractType<?>>, MapType> frozenInstances = new HashMap<>(); |
| |
| private final AbstractType<K> keys; |
| private final AbstractType<V> values; |
| private final MapSerializer<K, V> serializer; |
| private final boolean isMultiCell; |
| |
| public static MapType<?, ?> getInstance(TypeParser parser) throws ConfigurationException, SyntaxException |
| { |
| List<AbstractType<?>> l = parser.getTypeParameters(); |
| if (l.size() != 2) |
| throw new ConfigurationException("MapType takes exactly 2 type parameters"); |
| |
| return getInstance(l.get(0), l.get(1), true); |
| } |
| |
| public static synchronized <K, V> MapType<K, V> getInstance(AbstractType<K> keys, AbstractType<V> values, boolean isMultiCell) |
| { |
| Map<Pair<AbstractType<?>, AbstractType<?>>, MapType> internMap = isMultiCell ? instances : frozenInstances; |
| Pair<AbstractType<?>, AbstractType<?>> p = Pair.<AbstractType<?>, AbstractType<?>>create(keys, values); |
| MapType<K, V> t = internMap.get(p); |
| if (t == null) |
| { |
| t = new MapType<>(keys, values, isMultiCell); |
| internMap.put(p, t); |
| } |
| return t; |
| } |
| |
| private MapType(AbstractType<K> keys, AbstractType<V> values, boolean isMultiCell) |
| { |
| super(ComparisonType.CUSTOM, Kind.MAP); |
| this.keys = keys; |
| this.values = values; |
| this.serializer = MapSerializer.getInstance(keys.getSerializer(), values.getSerializer(), keys); |
| this.isMultiCell = isMultiCell; |
| } |
| |
| @Override |
| public boolean referencesUserType(String userTypeName) |
| { |
| return getKeysType().referencesUserType(userTypeName) || |
| getValuesType().referencesUserType(userTypeName); |
| } |
| |
| @Override |
| public boolean referencesDuration() |
| { |
| // Maps cannot be created with duration as keys |
| return getValuesType().referencesDuration(); |
| } |
| |
| public AbstractType<K> getKeysType() |
| { |
| return keys; |
| } |
| |
| public AbstractType<V> getValuesType() |
| { |
| return values; |
| } |
| |
| public AbstractType<K> nameComparator() |
| { |
| return keys; |
| } |
| |
| public AbstractType<V> valueComparator() |
| { |
| return values; |
| } |
| |
| @Override |
| public boolean isMultiCell() |
| { |
| return isMultiCell; |
| } |
| |
| @Override |
| public AbstractType<?> freeze() |
| { |
| if (isMultiCell) |
| return getInstance(this.keys, this.values, false); |
| else |
| return this; |
| } |
| |
| @Override |
| public AbstractType<?> freezeNestedMulticellTypes() |
| { |
| if (!isMultiCell()) |
| return this; |
| |
| AbstractType<?> keyType = (keys.isFreezable() && keys.isMultiCell()) |
| ? keys.freeze() |
| : keys.freezeNestedMulticellTypes(); |
| |
| AbstractType<?> valueType = (values.isFreezable() && values.isMultiCell()) |
| ? values.freeze() |
| : values.freezeNestedMulticellTypes(); |
| |
| return getInstance(keyType, valueType, isMultiCell); |
| } |
| |
| @Override |
| public boolean isCompatibleWithFrozen(CollectionType<?> previous) |
| { |
| assert !isMultiCell; |
| MapType tprev = (MapType) previous; |
| return keys.isCompatibleWith(tprev.keys) && values.isCompatibleWith(tprev.values); |
| } |
| |
| @Override |
| public boolean isValueCompatibleWithFrozen(CollectionType<?> previous) |
| { |
| assert !isMultiCell; |
| MapType tprev = (MapType) previous; |
| return keys.isCompatibleWith(tprev.keys) && values.isValueCompatibleWith(tprev.values); |
| } |
| |
| @Override |
| public int compareCustom(ByteBuffer o1, ByteBuffer o2) |
| { |
| return compareMaps(keys, values, o1, o2); |
| } |
| |
| public static int compareMaps(AbstractType<?> keysComparator, AbstractType<?> valuesComparator, ByteBuffer o1, ByteBuffer o2) |
| { |
| if (!o1.hasRemaining() || !o2.hasRemaining()) |
| return o1.hasRemaining() ? 1 : o2.hasRemaining() ? -1 : 0; |
| |
| ByteBuffer bb1 = o1.duplicate(); |
| ByteBuffer bb2 = o2.duplicate(); |
| |
| ProtocolVersion protocolVersion = ProtocolVersion.V3; |
| int size1 = CollectionSerializer.readCollectionSize(bb1, protocolVersion); |
| int size2 = CollectionSerializer.readCollectionSize(bb2, protocolVersion); |
| |
| for (int i = 0; i < Math.min(size1, size2); i++) |
| { |
| ByteBuffer k1 = CollectionSerializer.readValue(bb1, protocolVersion); |
| ByteBuffer k2 = CollectionSerializer.readValue(bb2, protocolVersion); |
| int cmp = keysComparator.compare(k1, k2); |
| if (cmp != 0) |
| return cmp; |
| |
| ByteBuffer v1 = CollectionSerializer.readValue(bb1, protocolVersion); |
| ByteBuffer v2 = CollectionSerializer.readValue(bb2, protocolVersion); |
| cmp = valuesComparator.compare(v1, v2); |
| if (cmp != 0) |
| return cmp; |
| } |
| |
| return size1 == size2 ? 0 : (size1 < size2 ? -1 : 1); |
| } |
| |
| @Override |
| public MapSerializer<K, V> getSerializer() |
| { |
| return serializer; |
| } |
| |
| @Override |
| protected int collectionSize(List<ByteBuffer> values) |
| { |
| return values.size() / 2; |
| } |
| |
| 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()).append(TypeParser.stringifyTypeParameters(Arrays.asList(keys, values), ignoreFreezing || !isMultiCell)); |
| if (includeFrozenType) |
| sb.append(")"); |
| return sb.toString(); |
| } |
| |
| public List<ByteBuffer> serializedValues(Iterator<Cell> cells) |
| { |
| assert isMultiCell; |
| List<ByteBuffer> bbs = new ArrayList<ByteBuffer>(); |
| while (cells.hasNext()) |
| { |
| Cell c = cells.next(); |
| bbs.add(c.path().get(0)); |
| bbs.add(c.value()); |
| } |
| return bbs; |
| } |
| |
| @Override |
| public Term fromJSONObject(Object parsed) throws MarshalException |
| { |
| if (parsed instanceof String) |
| parsed = Json.decodeJson((String) parsed); |
| |
| if (!(parsed instanceof Map)) |
| throw new MarshalException(String.format( |
| "Expected a map, but got a %s: %s", parsed.getClass().getSimpleName(), parsed)); |
| |
| Map<Object, Object> map = (Map<Object, Object>) parsed; |
| Map<Term, Term> terms = new HashMap<>(map.size()); |
| for (Map.Entry<Object, Object> entry : map.entrySet()) |
| { |
| if (entry.getKey() == null) |
| throw new MarshalException("Invalid null key in map"); |
| |
| if (entry.getValue() == null) |
| throw new MarshalException("Invalid null value in map"); |
| |
| terms.put(keys.fromJSONObject(entry.getKey()), values.fromJSONObject(entry.getValue())); |
| } |
| return new Maps.DelayedValue(keys, terms); |
| } |
| |
| @Override |
| public String toJSONString(ByteBuffer buffer, ProtocolVersion protocolVersion) |
| { |
| ByteBuffer value = buffer.duplicate(); |
| StringBuilder sb = new StringBuilder("{"); |
| int size = CollectionSerializer.readCollectionSize(value, protocolVersion); |
| for (int i = 0; i < size; i++) |
| { |
| if (i > 0) |
| sb.append(", "); |
| |
| // map keys must be JSON strings, so convert non-string keys to strings |
| String key = keys.toJSONString(CollectionSerializer.readValue(value, protocolVersion), protocolVersion); |
| if (key.startsWith("\"")) |
| sb.append(key); |
| else |
| sb.append('"').append(Json.quoteAsJsonString(key)).append('"'); |
| |
| sb.append(": "); |
| sb.append(values.toJSONString(CollectionSerializer.readValue(value, protocolVersion), protocolVersion)); |
| } |
| return sb.append("}").toString(); |
| } |
| } |