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package oracle.kv.impl.api.ops;

import java.io.IOException;
import java.io.ObjectInput;
import java.util.ArrayList;
import java.util.List;

import oracle.kv.Depth;
import oracle.kv.Direction;
import oracle.kv.KeyRange;
import oracle.kv.impl.api.ops.OperationHandler.KVAuthorizer;
import oracle.kv.impl.topo.PartitionId;

import com.sleepycat.je.CursorConfig;
import com.sleepycat.je.Transaction;

/**
 * A multi-get operation.
 */
public class MultiGet extends MultiKeyOperation {

    /**
     * Construct a multi-get operation.
     */
    public MultiGet(byte[] parentKey, KeyRange subRange, Depth depth) {
        super(OpCode.MULTI_GET, parentKey, subRange, depth);
    }

    /**
     * FastExternalizable constructor.  Must call superclass constructor first
     * to read common elements.
     */
    MultiGet(ObjectInput in, short serialVersion)
        throws IOException {

        super(OpCode.MULTI_GET, in, serialVersion);
    }

    @Override
    public Result execute(Transaction txn,
                          PartitionId partitionId,
                          OperationHandler operationHandler) {

        final KVAuthorizer kvAuth = checkPermission();

        final List<ResultKeyValueVersion> results =
            new ArrayList<ResultKeyValueVersion>();

        final boolean moreElements = operationHandler.iterate
            (txn, partitionId, getParentKey(), true /*majorPathComplete*/,
             getSubRange(), getDepth(), Direction.FORWARD, 0 /*batchSize*/,
             null /*resumeKey*/, CursorConfig.DEFAULT, results, kvAuth);

        assert (!moreElements);

        return new Result.IterateResult(getOpCode(), results, moreElements);
    }
}
