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/*******************************************************************************
 * 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.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.apache.cassandra.thrift.KeySlice;

import com.google.common.base.Function;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.netflix.astyanax.Serializer;
import com.netflix.astyanax.model.Row;
import com.netflix.astyanax.model.Rows;

/**
 * Wrapper for a key slice response.  
 * 
 * Will lazily create a lookup by key
 * 
 * @author elandau
 *
 * @param 
 * @param 
 */
public class ThriftRowsSliceImpl implements Rows {

    private List>   rows;
    private Map> lookup;

    public ThriftRowsSliceImpl(List rows, Serializer keySer, Serializer colSer) {
        this.rows   = Lists.newArrayListWithCapacity(rows.size());
        
        for (KeySlice row : rows) {
            Row thriftRow = new ThriftRowImpl(
                    keySer.fromBytes(row.getKey()), 
                    ByteBuffer.wrap(row.getKey()),
                    new ThriftColumnOrSuperColumnListImpl(row.getColumns(), colSer));
            this.rows.add(thriftRow);
        }
    }

    @Override
    public Iterator> iterator() {
        return rows.iterator();
    }

    @Override
    public Row getRow(K key) {
        lazyBuildLookup();
        return lookup.get(key);
    }

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

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

    @Override
    public Row getRowByIndex(int index) {
        return rows.get(index);
    }

    @Override
    public Collection getKeys() {
        return Lists.transform(rows, new Function, K>() {
            @Override
            public K apply(Row row) {
                return row.getKey();
            }
        });
    }
    
    private void lazyBuildLookup() {
        if (lookup == null) {
            this.lookup = Maps.newHashMap();
            for (Row row : rows) {
                this.lookup.put(row.getKey(),  row);
            }
        }
    }
}