public class

ThriftRowsSliceImpl

extends Object
implements Rows<K, C>

/*******************************************************************************
 * Copyright 2011 Netflix
 * 
 * Licensed 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 com.netflix.astyanax.thrift.model;

import java.nio.ByteBuffer;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.apache.cassandra.thrift.ColumnOrSuperColumn;
import org.apache.cassandra.thrift.KeySlice;

import com.netflix.astyanax.Serializer;
import com.netflix.astyanax.model.Row;
import com.netflix.astyanax.model.Rows;

public class ThriftRowsSliceImpl<K, C> implements Rows<K, C> {

    private List<KeySlice> rows;
    private Map<K, List<ColumnOrSuperColumn>> lookup;
    private Serializer<K> keySer;
    private Serializer<C> colSer;

    public ThriftRowsSliceImpl(List<KeySlice> rows, Serializer<K> keySer, Serializer<C> colSer) {
        this.keySer = keySer;
        this.colSer = colSer;
        this.rows = rows;
    }

    @Override
    public Iterator<Row<K, C>> iterator() {
        class IteratorImpl implements Iterator<Row<K, C>> {
            Iterator<KeySlice> base;

            public IteratorImpl(Iterator<KeySlice> base) {
                this.base = base;
            }

            @Override
            public boolean hasNext() {
                return base.hasNext();
            }

            @Override
            public Row<K, C> next() {
                KeySlice ks = base.next();
                return new ThriftRowImpl<K, C>(keySer.fromBytes(ks.getKey()), ByteBuffer.wrap(ks.getKey()),
                        new ThriftColumnOrSuperColumnListImpl<C>(ks.getColumns(), colSer));
            }

            @Override
            public void remove() {
                throw new UnsupportedOperationException("Iterator is immutable");
            }

        }
        return new IteratorImpl(rows.iterator());
    }

    @Override
    public Row<K, C> getRow(K key) {
        if (lookup == null) {
            lookup = new HashMap<K, List<ColumnOrSuperColumn>>(rows.size());
            for (KeySlice slice : rows) {
                lookup.put(keySer.fromBytes(slice.getKey()), slice.getColumns());
            }
        }

        List<ColumnOrSuperColumn> columns = lookup.get(key);
        if (key == null) {
            return null;
        }
        return new ThriftRowImpl<K, C>(key, keySer.toByteBuffer(key), new ThriftColumnOrSuperColumnListImpl<C>(columns,
                colSer));
    }

    @Override
    public int size() {
        return rows.size();
    }

    @Override
    public boolean isEmpty() {
        return rows.isEmpty();
    }

    @Override
    public Row<K, C> getRowByIndex(int index) {
        KeySlice ks = rows.get(index);
        return new ThriftRowImpl<K, C>(keySer.fromBytes(ks.getKey()), ByteBuffer.wrap(ks.getKey()),
                new ThriftColumnOrSuperColumnListImpl<C>(ks.getColumns(), colSer));
    }
}

  

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