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/*
 * Copyright (c) 2008-2015, Hazelcast, Inc. All Rights Reserved.
 *
 * 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.hazelcast.map.impl;

import com.hazelcast.map.QueryResultSizeExceededException;
import com.hazelcast.nio.ObjectDataInput;
import com.hazelcast.nio.ObjectDataOutput;
import com.hazelcast.nio.serialization.DataSerializable;
import com.hazelcast.query.impl.QueryResultEntry;
import com.hazelcast.query.impl.QueryResultEntryImpl;
import com.hazelcast.query.impl.QueryableEntry;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedHashSet;

public class QueryResult implements DataSerializable {

    private final Collection result = new LinkedHashSet();

    private Collection partitionIds;

    private transient long resultLimit;
    private transient long resultSize;

    public QueryResult() {
        this(Long.MAX_VALUE);
    }

    public QueryResult(long resultLimit) {
        this.resultLimit = resultLimit;
    }

    public void addAll(Collection queryableEntries) {
        for (QueryableEntry entry : queryableEntries) {
            if (++resultSize > resultLimit) {
                throw new QueryResultSizeExceededException();
            }
            QueryResultEntryImpl queryEntry = new QueryResultEntryImpl(
                    entry.getKeyData(), entry.getIndexKey(), entry.getValueData());
            result.add(queryEntry);
        }
    }

    public void setPartitionIds(Collection partitionIds) {
        this.partitionIds = partitionIds;
    }

    public Collection getPartitionIds() {
        return partitionIds;
    }

    public Collection getResult() {
        return result;
    }

    public void writeData(ObjectDataOutput out) throws IOException {
        int partitionSize = (partitionIds == null) ? 0 : partitionIds.size();
        out.writeInt(partitionSize);
        if (partitionSize > 0) {
            for (Integer partitionId : partitionIds) {
                out.writeInt(partitionId);
            }
        }
        int resultSize = result.size();
        out.writeInt(resultSize);
        if (resultSize > 0) {
            Iterator iterator = result.iterator();
            for (int i = 0; i < resultSize; i++) {
                QueryResultEntryImpl queryableEntry = (QueryResultEntryImpl) iterator.next();
                queryableEntry.writeData(out);
            }
        }
    }

    public void readData(ObjectDataInput in) throws IOException {
        int partitionSize = in.readInt();
        if (partitionSize > 0) {
            partitionIds = new ArrayList(partitionSize);
            for (int i = 0; i < partitionSize; i++) {
                partitionIds.add(in.readInt());
            }
        }
        int resultSize = in.readInt();
        if (resultSize > 0) {
            for (int i = 0; i < resultSize; i++) {
                QueryResultEntryImpl resultEntry = new QueryResultEntryImpl();
                resultEntry.readData(in);
                result.add(resultEntry);
            }
        }
    }
}