public class

ThriftCqlRowsImpl

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.CqlRow;

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

public class ThriftCqlRowsImpl<K, C> implements Rows<K, C> {
    private final List<CqlRow> rows;
    private Map<K, ThriftRowImpl<K, C>> lookup;
    private final Serializer<K> keySer;
    private final Serializer<C> colSer;

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

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

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

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

            @Override
            public Row<K, C> next() {
                CqlRow row = base.next();
                return new ThriftRowImpl<K, C>(keySer.fromBytes(row.getKey()), ByteBuffer.wrap(row.getKey()),
                        new ThriftColumnListImpl<C>(row.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, ThriftRowImpl<K, C>>(rows.size());
            for (CqlRow row : rows) {
                lookup.put(keySer.fromBytes(row.getKey()), new ThriftRowImpl<K, C>(key, ByteBuffer.wrap(row.getKey()),
                        new ThriftColumnListImpl<C>(row.getColumns(), colSer)));
            }
        }

        // TODO: Shouldn't this throw a not found exception, if not found
        return lookup.get(key);
    }

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

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

    @Override
    public Row<K, C> getRowByIndex(int i) {
        CqlRow row = rows.get(i);
        return new ThriftRowImpl<K, C>(keySer.fromBytes(row.getKey()), ByteBuffer.wrap(row.getKey()),
                new ThriftColumnListImpl<C>(row.getColumns(), colSer));
    }

}