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The Java Data Objects API (JDO) : a standard interface-based Java model abstraction of persistence, developed by the JCP.
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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 javax.jdo.metadata;

/**
 * Represents the top-level JDO metadata.
 * @since 3.0
 */
public interface JDOMetadata extends Metadata {
    /**
     * Method to set the catalog (ORM) to apply to all classes in this
     * JDO Metadata.
     * @param catalog Catalog name
     * @return This metadata object
     */
    JDOMetadata setCatalog(String catalog);

    /**
     * Accessor for the catalog (ORM) that all classes in this JDO Metadata
     * default to.
     * @return The catalog
     */
    String getCatalog();

    /**
     * Method to set the schema (ORM) to apply to all classes in this JDO
     * Metadata.
     * @param schema Schema name
     * @return This metadata object
     */
    JDOMetadata setSchema(String schema);

    /**
     * Accessor for the schema (ORM) that all classes in this JDO Metadata
     * default to.
     * @return The schema
     */
    String getSchema();

    /**
     * Accessor for all packages defined on the JDO Metadata.
     * @return The packages
     */
    PackageMetadata[] getPackages();

    /**
     * Add a new package to this JDO Metadata.
     * @param pkgName Name of the package
     * @return The PackageMetadata
     */
    PackageMetadata newPackageMetadata(String pkgName);

    /**
     * Add a new package to this JDO Metadata.
     * @param pkg The package
     * @return The PackageMetadata
     */
    PackageMetadata newPackageMetadata(Package pkg);

    /**
     * Accessor for the number of packages defined in this JDO Metadata.
     * @return The number of packages.
     */
    int getNumberOfPackages();

    /**
     * Add a new class to this JDO Metadata.
     * Adds its package also if not yet existing.
     * @param cls Class to add
     * @return The ClassMetadata
     */
    ClassMetadata newClassMetadata(Class cls);

    /**
     * Add a new interface to this JDO Metadata.
     * Adds its package also if not yet existing.
     * @param cls Class to add
     * @return The InterfaceMetadata
     */
    InterfaceMetadata newInterfaceMetadata(Class cls);

    /**
     * Accessor for any named queries defined on the JDO Metadata.
     * @return The queries
     */
    QueryMetadata[] getQueries();

    /**
     * Add a new named query to this JDO Metadata.
     * @param name Name of the query
     * @return The QueryMetadata
     */
    QueryMetadata newQueryMetadata(String name);

    /**
     * Accessor for the number of named queries defined in this JDO Metadata.
     * @return The number of queries.
     */
    int getNumberOfQueries();

    /**
     * Accessor for any fetch plans defined on the JDO Metadata.
     * @return The fetch plans
     */
    FetchPlanMetadata[] getFetchPlans();

    /**
     * Add a new fetch plan to this JDO Metadata.
     * 
     * @param name Name of the query
     * @return The FetchPlanMetadata
     */
    FetchPlanMetadata newFetchPlanMetadata(String name);

    /**
     * Accessor for the number of fetch plans defined in this JDO Metadata.
     * @return The number of fetch plans.
     */
    int getNumberOfFetchPlans();
}