Dépôt officiel du code source de l'ERP OpenConcerto

/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

 *

 * Copyright 2011 OpenConcerto, by ILM Informatique. All rights reserved.

 *

 * The contents of this file are subject to the terms of the GNU General Public License Version 3

 * only ("GPL"). You may not use this file except in compliance with the License. You can obtain a

 * copy of the License at http://www.gnu.org/licenses/gpl-3.0.html See the License for the specific

 * language governing permissions and limitations under the License.

 *

 * When distributing the software, include this License Header Notice in each file.

 */

 package org.openconcerto.sql.element;

import org.openconcerto.sql.Log;

import org.openconcerto.sql.model.DBStructureItemNotFound;

import org.openconcerto.sql.model.SQLName;

import org.openconcerto.sql.model.SQLTable;

import org.openconcerto.utils.CollectionMap;

import org.openconcerto.utils.CollectionUtils;

import org.openconcerto.utils.cc.ITransformer;

import java.lang.reflect.InvocationTargetException;

import java.util.ArrayList;

import java.util.Collection;

import java.util.Collections;

import java.util.HashMap;

import java.util.HashSet;

import java.util.List;

import java.util.Map;

import java.util.Set;

/**

 * Directory of SQLElement by table.

 *

 * @author Sylvain CUAZ

 */

public final class SQLElementDirectory {

    private final Map<SQLTable, SQLElement> elements;

    private final CollectionMap<String, SQLTable> tableNames;

    private final CollectionMap<Class<? extends SQLElement>, SQLTable> byClass;

    private final List<DirectoryListener> listeners;

    public SQLElementDirectory() {

        this.elements = new HashMap<SQLTable, SQLElement>();

        // to mimic elements behaviour, if we add twice the same table

        // the second one should replace the first one

        this.tableNames = new CollectionMap<String, SQLTable>(HashSet.class);

        this.byClass = new CollectionMap<Class<? extends SQLElement>, SQLTable>(HashSet.class);

        this.listeners = new ArrayList<DirectoryListener>();

    }

    private static <K> SQLTable getSoleTable(CollectionMap<K, SQLTable> m, K key) throws IllegalArgumentException {

        final Collection<SQLTable> res = m.getNonNull(key);

        if (res.size() > 1)

            throw new IllegalArgumentException(key + " is not unique: " + CollectionUtils.join(res, ",", new ITransformer<SQLTable, SQLName>() {

                @Override

                public SQLName transformChecked(SQLTable input) {

                    return input.getSQLName();

                }

            }));

        return CollectionUtils.getSole(res);

    }

    public synchronized final void putAll(SQLElementDirectory o) {

        for (final SQLElement elem : o.getElements()) {

            if (!this.contains(elem.getTable()))

                this.addSQLElement(elem);

        }

    }

    /**

     * Add an element by creating it with the no-arg constructor. If the element cannot find its

     * table and thus raise DBStructureItemNotFound, the exception is logged.

     *

     * @param element the element to add.

     */

    public final void addSQLElement(final Class<? extends SQLElement> element) {

        try {

            this.addSQLElement(element.getConstructor().newInstance());

        } catch (InvocationTargetException e) {

            if (e.getCause() instanceof DBStructureItemNotFound) {

                Log.get().config("ignore inexistent tables: " + e.getCause().getLocalizedMessage());

                return;

            }

            throw new IllegalArgumentException("ctor failed", e);

        } catch (Exception e) {

            throw new IllegalArgumentException("no-arg ctor failed", e);

        }

    }

    /**

     * Adds an already instantiated element.

     *

     * @param elem the SQLElement to add.

     */

    public synchronized final void addSQLElement(SQLElement elem) {

        this.elements.put(elem.getTable(), elem);

        this.tableNames.put(elem.getTable().getName(), elem.getTable());

        this.byClass.put(elem.getClass(), elem.getTable());

        for (final DirectoryListener dl : this.listeners) {

            dl.elementAdded(elem);

        }

    }

    public synchronized final boolean contains(SQLTable t) {

        return this.elements.containsKey(t);

    }

    public synchronized final SQLElement getElement(SQLTable t) {

        return this.elements.get(t);

    }

    /**

     * Search for a table whose name is <code>tableName</code>.

     *

     * @param tableName a table name, e.g. "ADRESSE".

     * @return the corresponding SQLElement, or <code>null</code> if there is no table named

     *         <code>tableName</code>.

     * @throws IllegalArgumentException if more than one table match.

     */

    public synchronized final SQLElement getElement(String tableName) {

        return this.getElement(getSoleTable(this.tableNames, tableName));

    }

    /**

     * Search for an SQLElement whose class is <code>clazz</code>.

     *

     * @param <S> type of SQLElement

     * @param clazz the class.

     * @return the corresponding SQLElement, or <code>null</code> if none can be found.

     * @throws IllegalArgumentException if there's more than one match.

     */

    public synchronized final <S extends SQLElement> S getElement(Class<S> clazz) {

        return clazz.cast(this.getElement(getSoleTable(this.byClass, clazz)));

    }

    public synchronized final Set<SQLTable> getTables() {

        return this.getElementsMap().keySet();

    }

    public synchronized final Collection<SQLElement> getElements() {

        return this.getElementsMap().values();

    }

    public final Map<SQLTable, SQLElement> getElementsMap() {

        return Collections.unmodifiableMap(this.elements);

    }

    /**

     * Remove the passed instance. NOTE: this method only remove the specific instance passed, so

     * it's a conditional <code>removeSQLElement(elem.getTable())</code>.

     *

     * @param elem the instance to remove.

     * @see #removeSQLElement(SQLTable)

     */

    public synchronized void removeSQLElement(SQLElement elem) {

        if (this.getElement(elem.getTable()) == elem)

            this.removeSQLElement(elem.getTable());

    }

    /**

     * Remove the element for the passed table.

     *

     * @param t the table to remove.

     * @return the removed element, can be <code>null</code>.

     */

    public synchronized SQLElement removeSQLElement(SQLTable t) {

        final SQLElement elem = this.elements.remove(t);

        if (elem != null) {

            this.tableNames.remove(elem.getTable().getName(), elem.getTable());

            this.byClass.remove(elem.getClass(), elem.getTable());

            // MAYBE only reset neighbours.

            for (final SQLElement otherElem : this.elements.values())

                otherElem.resetRelationships();

            for (final DirectoryListener dl : this.listeners) {

                dl.elementRemoved(elem);

            }

        }

        return elem;

    }

    public synchronized final void addListener(DirectoryListener dl) {

        this.listeners.add(dl);

    }

    public synchronized final void removeListener(DirectoryListener dl) {

        this.listeners.remove(dl);

    }

    static public interface DirectoryListener {

        void elementAdded(SQLElement elem);

        void elementRemoved(SQLElement elem);

    }

}