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 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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package org.hsqldb.persist;

import org.hsqldb.HsqlException;
import org.hsqldb.HsqlNameManager.HsqlName;
import org.hsqldb.Table;
import org.hsqldb.lib.HashMap;
import org.hsqldb.lib.Iterator;

/*
 * Manages the TEXT TABLE caches in the database. A separate class from
 * version 2.3.3
 *
 * @author Bob Preston (sqlbob@users dot sourceforge.net)
 * @author Fred Toussi (fredt@users dot sourceforge.net)
 * @version 2.7.3
 * @since 1.7.0
 */
public class TextTableStorageManager {

    //
    private HashMap<HsqlName, TextCache> textCacheList = new HashMap<>();

    TextTableStorageManager() {}

    /**
     *  Opens the TextCache object.
     */
    public DataFileCache openTextFilePersistence(
            Table table,
            String source,
            boolean readOnlyData,
            boolean reversed) {

        closeTextCache(table);

        TextCache c = new TextCache(table, source);

        c.open(readOnlyData || reversed);
        textCacheList.put(table.getName(), c);

        return c;
    }

    /**
     *  Closes the TextCache object.
     */
    public void closeTextCache(Table table) {

        TextCache c = textCacheList.remove(table.getName());

        if (c != null) {
            try {
                c.close();
            } catch (HsqlException e) {}
        }
    }

    public void closeAllTextCaches(boolean delete) {

        Iterator<TextCache> it = textCacheList.values().iterator();

        while (it.hasNext()) {
            TextCache textCache = it.next();

            // use textCache.table to cover both cache and table readonly
            if (delete && !textCache.table.isDataReadOnly()) {
                textCache.purge();
            } else {
                textCache.close();
            }
        }
    }

    public boolean isAnyTextCacheModified() {

        Iterator<TextCache> it = textCacheList.values().iterator();

        while (it.hasNext()) {
            if (it.next().isModified()) {
                return true;
            }
        }

        return false;
    }
}
