| /* |
| * 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.composites; |
| |
| import java.nio.ByteBuffer; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.List; |
| |
| import org.apache.cassandra.db.marshal.AbstractType; |
| import org.apache.cassandra.db.marshal.CompositeType; |
| |
| /** |
| * A truly-composite CType. |
| */ |
| public class CompoundCType extends AbstractCType |
| { |
| final List<AbstractType<?>> types; |
| |
| // It's up to the caller to pass a list that is effectively immutable |
| public CompoundCType(List<AbstractType<?>> types) |
| { |
| super(isByteOrderComparable(types)); |
| this.types = types; |
| } |
| |
| public boolean isCompound() |
| { |
| return true; |
| } |
| |
| public int size() |
| { |
| return types.size(); |
| } |
| |
| public AbstractType<?> subtype(int i) |
| { |
| return types.get(i); |
| } |
| |
| public Composite fromByteBuffer(ByteBuffer bytes) |
| { |
| if (!bytes.hasRemaining()) |
| return Composites.EMPTY; |
| |
| ByteBuffer[] elements = new ByteBuffer[size()]; |
| int idx = bytes.position(), i = 0; |
| byte eoc = 0; |
| |
| boolean isStatic = false; |
| if (CompositeType.isStaticName(bytes)) |
| { |
| isStatic = true; |
| idx += 2; |
| } |
| |
| while (idx < bytes.limit()) |
| { |
| checkRemaining(bytes, idx, 2); |
| int length = bytes.getShort(idx) & 0xFFFF; |
| idx += 2; |
| |
| checkRemaining(bytes, idx, length + 1); |
| elements[i++] = sliceBytes(bytes, idx, length); |
| idx += length; |
| eoc = bytes.get(idx++); |
| } |
| return new CompoundComposite(elements, i, isStatic).withEOC(Composite.EOC.from(eoc)); |
| } |
| |
| public CBuilder builder() |
| { |
| return new CompoundCBuilder(this); |
| } |
| |
| public CompoundCType setSubtype(int position, AbstractType<?> newType) |
| { |
| List<AbstractType<?>> newTypes = new ArrayList<AbstractType<?>>(types); |
| newTypes.set(position, newType); |
| return new CompoundCType(newTypes); |
| } |
| |
| public AbstractType<?> asAbstractType() |
| { |
| return CompositeType.getInstance(types); |
| } |
| |
| public static class CompoundCBuilder implements CBuilder |
| { |
| private final CType type; |
| private final ByteBuffer[] values; |
| private int size; |
| private boolean built; |
| |
| public CompoundCBuilder(CType type) |
| { |
| this.type = type; |
| this.values = new ByteBuffer[type.size()]; |
| } |
| |
| public int remainingCount() |
| { |
| return values.length - size; |
| } |
| |
| public CBuilder add(ByteBuffer value) |
| { |
| if (isDone()) |
| throw new IllegalStateException(); |
| values[size++] = value; |
| return this; |
| } |
| |
| public CBuilder add(Object value) |
| { |
| return add(((AbstractType)type.subtype(size)).decompose(value)); |
| } |
| |
| private boolean isDone() |
| { |
| return remainingCount() == 0 || built; |
| } |
| |
| public Composite build() |
| { |
| if (size == 0) |
| return Composites.EMPTY; |
| |
| // We don't allow to add more element to a builder that has been built so |
| // that we don't have to copy values. |
| built = true; |
| |
| // If the builder is full and we're building a dense cell name, then we can |
| // directly allocate the CellName object as it's complete. |
| if (size == values.length && type instanceof CellNameType && ((CellNameType)type).isDense()) |
| return new CompoundDenseCellName(values); |
| return new CompoundComposite(values, size, false); |
| } |
| |
| public Composite buildWith(ByteBuffer value) |
| { |
| ByteBuffer[] newValues = Arrays.copyOf(values, values.length); |
| newValues[size] = value; |
| // Same as above |
| if (size+1 == newValues.length && type instanceof CellNameType && ((CellNameType)type).isDense()) |
| return new CompoundDenseCellName(newValues); |
| |
| return new CompoundComposite(newValues, size+1, false); |
| } |
| |
| public Composite buildWith(List<ByteBuffer> newValues) |
| { |
| ByteBuffer[] buffers = Arrays.copyOf(values, values.length); |
| int newSize = size; |
| for (ByteBuffer value : newValues) |
| buffers[newSize++] = value; |
| |
| if (newSize == buffers.length && type instanceof CellNameType && ((CellNameType)type).isDense()) |
| return new CompoundDenseCellName(buffers); |
| |
| return new CompoundComposite(buffers, newSize, false); |
| } |
| } |
| } |