sampleviews.java

嵌入式数据库Berkeley DB-4.5.20源代码

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 2002-2006
 *	Oracle Corporation.  All rights reserved.
 *
 * $Id: SampleViews.java,v 12.4 2006/08/24 14:46:00 bostic Exp $
 */

package collections.ship.tuple;

import com.sleepycat.bind.EntityBinding;
import com.sleepycat.bind.EntryBinding;
import com.sleepycat.bind.serial.ClassCatalog;
import com.sleepycat.bind.serial.TupleSerialBinding;
import com.sleepycat.bind.tuple.TupleBinding;
import com.sleepycat.bind.tuple.TupleInput;
import com.sleepycat.bind.tuple.TupleOutput;
import com.sleepycat.collections.StoredSortedMap;
import com.sleepycat.collections.StoredSortedValueSet;

/**
 * SampleViews defines the data bindings and collection views for the sample
 * database.
 *
 * @author Mark Hayes
 */
public class SampleViews {

    private StoredSortedMap partMap;
    private StoredSortedMap supplierMap;
    private StoredSortedMap shipmentMap;
    private StoredSortedMap shipmentByPartMap;
    private StoredSortedMap shipmentBySupplierMap;
    private StoredSortedMap supplierByCityMap;

    /**
     * Create the data bindings and collection views.
     */
    public SampleViews(SampleDatabase db) {

        // Create the data bindings.
        // In this sample, EntityBinding classes are used to bind the stored
        // key/data entry pair to a combined data object.  For keys, a
        // one-to-one binding is implemented with EntryBinding classes to bind
        // the stored tuple entry to a key Object.
        //
        ClassCatalog catalog = db.getClassCatalog();
        EntryBinding partKeyBinding =
            new PartKeyBinding();
        EntityBinding partDataBinding =
            new PartBinding(catalog, PartData.class);
        EntryBinding supplierKeyBinding =
            new SupplierKeyBinding();
        EntityBinding supplierDataBinding =
            new SupplierBinding(catalog, SupplierData.class);
        EntryBinding shipmentKeyBinding =
            new ShipmentKeyBinding();
        EntityBinding shipmentDataBinding =
            new ShipmentBinding(catalog, ShipmentData.class);
        EntryBinding cityKeyBinding =
            TupleBinding.getPrimitiveBinding(String.class);

        // Create map views for all stores and indices.
        // StoredSortedMap is used since the stores and indices are ordered
        // (they use the DB_BTREE access method).
        //
        partMap =
            new StoredSortedMap(db.getPartDatabase(),
				partKeyBinding, partDataBinding, true);
        supplierMap =
            new StoredSortedMap(db.getSupplierDatabase(),
				supplierKeyBinding, supplierDataBinding, true);
        shipmentMap =
            new StoredSortedMap(db.getShipmentDatabase(),
				shipmentKeyBinding, shipmentDataBinding, true);
        shipmentByPartMap =
            new StoredSortedMap(db.getShipmentByPartDatabase(),
                                partKeyBinding, shipmentDataBinding, true);
        shipmentBySupplierMap =
            new StoredSortedMap(db.getShipmentBySupplierDatabase(),
                                supplierKeyBinding, shipmentDataBinding, true);
        supplierByCityMap =
            new StoredSortedMap(db.getSupplierByCityDatabase(),
                                cityKeyBinding, supplierDataBinding, true);
    }

    // The views returned below can be accessed using the java.util.Map or
    // java.util.Set interfaces, or using the StoredSortedMap and
    // StoredValueSet classes, which provide additional methods.  The entity
    // sets could be obtained directly from the Map.values() method but
    // convenience methods are provided here to return them in order to avoid
    // down-casting elsewhere.

    /**
     * Return a map view of the part storage container.
     */
    public StoredSortedMap getPartMap() {

        return partMap;
    }

    /**
     * Return a map view of the supplier storage container.
     */
    public StoredSortedMap getSupplierMap() {

        return supplierMap;
    }

    /**
     * Return a map view of the shipment storage container.
     */
    public StoredSortedMap getShipmentMap() {

        return shipmentMap;
    }

    /**
     * Return an entity set view of the part storage container.
     */
    public StoredSortedValueSet getPartSet() {

        return (StoredSortedValueSet) partMap.values();
    }

    /**
     * Return an entity set view of the supplier storage container.
     */
    public StoredSortedValueSet getSupplierSet() {

        return (StoredSortedValueSet) supplierMap.values();
    }

    /**
     * Return an entity set view of the shipment storage container.
     */
    public StoredSortedValueSet getShipmentSet() {

        return (StoredSortedValueSet) shipmentMap.values();
    }

    /**
     * Return a map view of the shipment-by-part index.
     */
    public StoredSortedMap getShipmentByPartMap() {

        return shipmentByPartMap;
    }

    /**
     * Return a map view of the shipment-by-supplier index.
     */
    public StoredSortedMap getShipmentBySupplierMap() {

        return shipmentBySupplierMap;
    }

    /**
     * Return a map view of the supplier-by-city index.
     */
    public final StoredSortedMap getSupplierByCityMap() {

        return supplierByCityMap;
    }

    /**
     * PartKeyBinding is used to bind the stored key tuple entry for a part to
     * a key object representation.
     */
    private static class PartKeyBinding extends TupleBinding {

        /**
         * Construct the binding object.
         */
        private PartKeyBinding() {
        }

        /**
         * Create the key object from the stored key tuple entry.
         */
        public Object entryToObject(TupleInput input) {

            String number = input.readString();
            return new PartKey(number);
        }

        /**
         * Create the stored key tuple entry from the key object.
         */
        public void objectToEntry(Object object, TupleOutput output) {

            PartKey key = (PartKey) object;
            output.writeString(key.getNumber());
        }
    }

    /**
     * PartBinding is used to bind the stored key/data entry pair for a part
     * to a combined data object (entity).
     */
    private static class PartBinding extends TupleSerialBinding {

        /**
         * Construct the binding object.
         */
        private PartBinding(ClassCatalog classCatalog, Class dataClass) {

            super(classCatalog, dataClass);
        }

        /**
         * Create the entity by combining the stored key and data.
         */
        public Object entryToObject(TupleInput keyInput, Object dataInput) {

            String number = keyInput.readString();
            PartData data = (PartData) dataInput;
            return new Part(number, data.getName(), data.getColor(),
                            data.getWeight(), data.getCity());
        }

        /**
         * Create the stored key from the entity.
         */
        public void objectToKey(Object object, TupleOutput output) {

            Part part = (Part) object;
            output.writeString(part.getNumber());
        }

        /**
         * Create the stored data from the entity.
         */
        public Object objectToData(Object object) {

            Part part = (Part) object;
            return new PartData(part.getName(), part.getColor(),
                                 part.getWeight(), part.getCity());
        }
    }

    /**
     * SupplierKeyBinding is used to bind the stored key tuple entry for a
     * supplier to a key object representation.
     */
    private static class SupplierKeyBinding extends TupleBinding {

        /**
         * Construct the binding object.
         */
        private SupplierKeyBinding() {
        }

        /**
         * Create the key object from the stored key tuple entry.
         */
        public Object entryToObject(TupleInput input) {

            String number = input.readString();
            return new SupplierKey(number);
        }

        /**
         * Create the stored key tuple entry from the key object.
         */
        public void objectToEntry(Object object, TupleOutput output) {

            SupplierKey key = (SupplierKey) object;
            output.writeString(key.getNumber());
        }
    }

    /**
     * SupplierBinding is used to bind the stored key/data entry pair for a
     * supplier to a combined data object (entity).
     */
    private static class SupplierBinding extends TupleSerialBinding {

        /**
         * Construct the binding object.
         */
        private SupplierBinding(ClassCatalog classCatalog, Class dataClass) {

            super(classCatalog, dataClass);
        }

        /**
         * Create the entity by combining the stored key and data.
         */
        public Object entryToObject(TupleInput keyInput, Object dataInput) {

            String number = keyInput.readString();
            SupplierData data = (SupplierData) dataInput;
            return new Supplier(number, data.getName(),
                                data.getStatus(), data.getCity());
        }

        /**
         * Create the stored key from the entity.
         */
        public void objectToKey(Object object, TupleOutput output) {

            Supplier supplier = (Supplier) object;
            output.writeString(supplier.getNumber());
        }

        /**
         * Create the stored data from the entity.
         */
        public Object objectToData(Object object) {

            Supplier supplier = (Supplier) object;
            return new SupplierData(supplier.getName(), supplier.getStatus(),
                                     supplier.getCity());
        }
    }

    /**
     * ShipmentKeyBinding is used to bind the stored key tuple entry for a
     * shipment to a key object representation.
     */
    private static class ShipmentKeyBinding extends TupleBinding {

        /**
         * Construct the binding object.
         */
        private ShipmentKeyBinding() {
        }

        /**
         * Create the key object from the stored key tuple entry.
         */
        public Object entryToObject(TupleInput input) {

            String partNumber = input.readString();
            String supplierNumber = input.readString();
            return new ShipmentKey(partNumber, supplierNumber);
        }

        /**
         * Create the stored key tuple entry from the key object.
         */
        public void objectToEntry(Object object, TupleOutput output) {

            ShipmentKey key = (ShipmentKey) object;
            output.writeString(key.getPartNumber());
            output.writeString(key.getSupplierNumber());
        }
    }

    /**
     * ShipmentBinding is used to bind the stored key/data entry pair for a
     * shipment to a combined data object (entity).
     */
    private static class ShipmentBinding extends TupleSerialBinding {

        /**
         * Construct the binding object.
         */
        private ShipmentBinding(ClassCatalog classCatalog, Class dataClass) {

            super(classCatalog, dataClass);
        }

        /**
         * Create the entity by combining the stored key and data.
         */
        public Object entryToObject(TupleInput keyInput, Object dataInput) {

            String partNumber = keyInput.readString();
            String supplierNumber = keyInput.readString();
            ShipmentData data = (ShipmentData) dataInput;
            return new Shipment(partNumber, supplierNumber,
                                data.getQuantity());
        }

        /**
         * Create the stored key from the entity.
         */
        public void objectToKey(Object object, TupleOutput output) {

            Shipment shipment = (Shipment) object;
            output.writeString(shipment.getPartNumber());
            output.writeString(shipment.getSupplierNumber());
        }

        /**
         * Create the stored data from the entity.
         */
        public Object objectToData(Object object) {

            Shipment shipment = (Shipment) object;
            return new ShipmentData(shipment.getQuantity());
        }
    }
}