| /* |
| * 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.io.DataInput; |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.util.Comparator; |
| |
| import net.nicoulaj.compilecommand.annotations.Inline; |
| import org.apache.cassandra.db.Cell; |
| import org.apache.cassandra.db.NativeCell; |
| import org.apache.cassandra.db.marshal.AbstractType; |
| import org.apache.cassandra.utils.ByteBufferUtil; |
| |
| public abstract class AbstractSimpleCellNameType extends AbstractCellNameType |
| { |
| protected final AbstractType<?> type; |
| |
| static final Comparator<Cell> rightNativeCell = new Comparator<Cell>() |
| { |
| public int compare(Cell o1, Cell o2) |
| { |
| return -((NativeCell) o2).compareToSimple(o1.name()); |
| } |
| }; |
| |
| static final Comparator<Cell> neitherNativeCell = new Comparator<Cell>() |
| { |
| public int compare(Cell o1, Cell o2) |
| { |
| return compareUnsigned(o1.name(), o2.name()); |
| } |
| }; |
| |
| // only one or the other of these will ever be used |
| static final Comparator<Object> asymmetricRightNativeCell = new Comparator<Object>() |
| { |
| public int compare(Object o1, Object o2) |
| { |
| return -((NativeCell) o2).compareToSimple((Composite) o1); |
| } |
| }; |
| |
| static final Comparator<Object> asymmetricNeitherNativeCell = new Comparator<Object>() |
| { |
| public int compare(Object o1, Object o2) |
| { |
| return compareUnsigned((Composite) o1, ((Cell) o2).name()); |
| } |
| }; |
| |
| protected AbstractSimpleCellNameType(AbstractType<?> type) |
| { |
| super(type.isByteOrderComparable()); |
| this.type = type; |
| } |
| |
| public boolean isCompound() |
| { |
| return false; |
| } |
| |
| public int size() |
| { |
| return 1; |
| } |
| |
| @Inline |
| static int compareUnsigned(Composite c1, Composite c2) |
| { |
| ByteBuffer b1 = c1.toByteBuffer(); |
| ByteBuffer b2 = c2.toByteBuffer(); |
| return ByteBufferUtil.compareUnsigned(b1, b2); |
| } |
| |
| public int compare(Composite c1, Composite c2) |
| { |
| if (isByteOrderComparable) |
| return compareUnsigned(c1, c2); |
| |
| assert !(c1.isEmpty() | c2.isEmpty()); |
| return type.compare(c1.get(0), c2.get(0)); |
| } |
| |
| protected Comparator<Cell> getByteOrderColumnComparator(boolean isRightNative) |
| { |
| if (isRightNative) |
| return rightNativeCell; |
| return neitherNativeCell; |
| } |
| |
| protected Comparator<Object> getByteOrderAsymmetricColumnComparator(boolean isRightNative) |
| { |
| if (isRightNative) |
| return asymmetricRightNativeCell; |
| return asymmetricNeitherNativeCell; |
| } |
| |
| public AbstractType<?> subtype(int i) |
| { |
| if (i != 0) |
| throw new IllegalArgumentException(); |
| return type; |
| } |
| |
| protected CellName makeCellName(ByteBuffer[] components) |
| { |
| assert components.length == 1; |
| return cellFromByteBuffer(components[0]); |
| } |
| |
| public CBuilder builder() |
| { |
| return new SimpleCType.SimpleCBuilder(this); |
| } |
| |
| public AbstractType<?> asAbstractType() |
| { |
| return type; |
| } |
| |
| public Deserializer newDeserializer(DataInput in) |
| { |
| return new SimpleDeserializer(this, in); |
| } |
| |
| private static class SimpleDeserializer implements CellNameType.Deserializer |
| { |
| private final AbstractSimpleCellNameType type; |
| private ByteBuffer next; |
| private final DataInput in; |
| |
| public SimpleDeserializer(AbstractSimpleCellNameType type, DataInput in) |
| { |
| this.type = type; |
| this.in = in; |
| } |
| |
| public boolean hasNext() throws IOException |
| { |
| if (next == null) |
| maybeReadNext(); |
| |
| return next.hasRemaining(); |
| } |
| |
| public boolean hasUnprocessed() throws IOException |
| { |
| return next != null; |
| } |
| |
| public int compareNextTo(Composite composite) throws IOException |
| { |
| maybeReadNext(); |
| |
| if (composite.isEmpty()) |
| return next.hasRemaining() ? 1 : 0; |
| |
| return type.subtype(0).compare(next, composite.get(0)); |
| } |
| |
| private void maybeReadNext() throws IOException |
| { |
| if (next != null) |
| return; |
| |
| int length = in.readShort() & 0xFFFF; |
| // Note that empty is ok because it marks the end of row |
| if (length == 0) |
| { |
| next = ByteBufferUtil.EMPTY_BYTE_BUFFER; |
| return; |
| } |
| |
| byte[] b = new byte[length]; |
| in.readFully(b); |
| next = ByteBuffer.wrap(b); |
| } |
| |
| public Composite readNext() throws IOException |
| { |
| maybeReadNext(); |
| Composite c = type.fromByteBuffer(next); |
| next = null; |
| return c; |
| } |
| |
| public void skipNext() throws IOException |
| { |
| maybeReadNext(); |
| next = null; |
| } |
| } |
| } |