+
−/*
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− * This Source Code Form is subject to the terms of the Mozilla Public
+
− * License, v. 2.0.  If a copy of the MPL was not distributed with this
+
− * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
− *
+
− * Copyright 2016 MonetDB B.V.
+
− */
+
−
+
−package nl.cwi.monetdb.embedded.env;
+
−
+
−import java.io.Closeable;
+
−import java.util.Random;
+
−
+
−/**
+
− * The base class for a pending statement to a connection.
+
− *
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− * @author <a href="mailto:pedro.ferreira@monetdbsolutions.com">Pedro Ferreira</a>
+
− */
+
−public abstract class AbstractConnectionResult implements Closeable {
+
−
+
−    /**
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−     * A random instance to generate the result set identifier.
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−     */
+
−    private static final Random Randomizer = new Random();
+
−
+
−    /**
+
−     * The corresponding connection of this result.
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−     */
+
−    private final MonetDBEmbeddedConnection connection;
+
−
+
−    /**
+
−     * A long value used to identify this result set.
+
−     */
+
−    private final long randomIdentifier;
+
−
+
−    protected AbstractConnectionResult(MonetDBEmbeddedConnection connection) {
+
−        this.connection = connection;
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−        this.randomIdentifier = Randomizer.nextLong();
+
−    }
+
−
+
−    /**
+
−     * Gets the corresponding connection to this statement result.
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−     *
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−     * @return A MonetDBEmbeddedConnection instance
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−     */
+
−    public MonetDBEmbeddedConnection getConnection() { return connection; }
+
−
+
−    /**
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−     * Gets a long number randomly generated, used to identify the result set.
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−     *
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−     * @return A random long identifier
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−     */
+
−    protected long getRandomIdentifier() { return randomIdentifier; }
+
−
+
−    /**
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−     * To be called by the connection when is closing.
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−     */
+
−    protected abstract void closeImplementation();
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−
+
−    @Override
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−    public void close() {
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−        this.closeImplementation();
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−        this.connection.removeQueryResult(this);
+
−    }
+
−}