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Berkeley DB Java Edition is a open source, transactional storage solution for Java applications. The Direct Persistence Layer (DPL) API is faster and easier to develop, deploy, and manage than serialized object files or ORM-based Java persistence solutions. The Collections API enhances the standard java.util.collections classes allowing them to be persisted to a local file system and accessed concurrently while protected by ACID transactions. Data is stored by serializing objects and managing class and instance data separately so as not to waste space. Berkeley DB Java Edition is the reliable drop-in solution for complex, fast, and scalable storage. Source for this release is in 'je-4.0.92-sources.jar', the Javadoc is located at 'http://download.oracle.com/berkeley-db/docs/je/4.0.92/'.

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/*-
 * Copyright (C) 2002, 2018, Oracle and/or its affiliates. All rights reserved.
 *
 * This file was distributed by Oracle as part of a version of Oracle Berkeley
 * DB Java Edition made available at:
 *
 * http://www.oracle.com/technetwork/database/database-technologies/berkeleydb/downloads/index.html
 *
 * Please see the LICENSE file included in the top-level directory of the
 * appropriate version of Oracle Berkeley DB Java Edition for a copy of the
 * license and additional information.
 */

package com.sleepycat.persist.impl;

import java.lang.reflect.Array;
import java.util.IdentityHashMap;
import java.util.Map;
import java.util.Set;

import com.sleepycat.persist.model.EntityModel;
import com.sleepycat.persist.raw.RawObject;

/**
 * An array of primitives having one dimension.  Multidimensional arrays are
 * handled by {@link ObjectArrayFormat}.
 *
 * @author Mark Hayes
 */
public class PrimitiveArrayFormat extends Format {

    private static final long serialVersionUID = 8285299924106073591L;

    private SimpleFormat componentFormat;

    PrimitiveArrayFormat(Catalog catalog, Class type) {
        super(catalog, type);
    }

    @Override
    public boolean isArray() {
        return true;
    }

    @Override
    public int getDimensions() {
        return 1;
    }

    @Override
    public Format getComponentType() {
        return componentFormat;
    }

    @Override
    void collectRelatedFormats(Catalog catalog,
                               Map newFormats) {
        /* Component type is simple and simple type formats are predefined. */
    }

    @Override
    void initialize(Catalog catalog, EntityModel model, int initVersion) {

        /*
         * getExistingType is allowed (to support raw mode) because primitive
         * arrays are always available in Java.
         */
        componentFormat = (SimpleFormat)
            catalog.getFormat(getExistingType().getComponentType().getName());
    }

    @Override
    Object newArray(int len) {
        return Array.newInstance(getType(), len);
    }

    @Override
    public Object newInstance(EntityInput input, boolean rawAccess)
        throws RefreshException {

        int len = input.readArrayLength();
        if (rawAccess) {
            return new RawObject(this, new Object[len]);
        } else {
            return componentFormat.newPrimitiveArray(len, input);
        }
    }

    @Override
    public Object readObject(Object o, EntityInput input, boolean rawAccess)
        throws RefreshException {

        if (rawAccess) {
            Object[] a = ((RawObject) o).getElements();
            for (int i = 0; i < a.length; i += 1) {
                a[i] = componentFormat.newInstance(input, true);
                componentFormat.readObject(a[i], input, true);
            }
        }
        /* Else, do nothing -- newInstance reads the value. */
        return o;
    }

    @Override
    void writeObject(Object o, EntityOutput output, boolean rawAccess)
        throws RefreshException {

        if (rawAccess) {
            Object[] a = ((RawObject) o).getElements();
            output.writeArrayLength(a.length);
            for (int i = 0; i < a.length; i += 1) {
                componentFormat.writeObject(a[i], output, true);
            }
        } else {
            componentFormat.writePrimitiveArray(o, output);
        }
    }

    @Override
    Object convertRawObject(Catalog catalog,
                            boolean rawAccess,
                            RawObject rawObject,
                            IdentityHashMap converted)
        throws RefreshException {

        RawArrayInput input = new RawArrayInput
            (catalog, rawAccess, converted, rawObject, componentFormat);
        Object a = newInstance(input, rawAccess);
        converted.put(rawObject, a);
        return readObject(a, input, rawAccess);
    }

    @Override
    void skipContents(RecordInput input) {
        int len = input.readPackedInt();
        componentFormat.skipPrimitiveArray(len, input);
    }

    @Override
    void copySecMultiKey(RecordInput input, Format keyFormat, Set results) {
        int len = input.readPackedInt();
        componentFormat.copySecMultiKeyPrimitiveArray(len, input, results);
    }

    @Override
    boolean evolve(Format newFormat, Evolver evolver) {
        evolver.useOldFormat(this, newFormat);
        return true;
    }
}