/*
 * Copyright 2011 JBoss Inc
 *
 * Licensed 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 org.drools.workbench.screens.guided.dtable.model;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

import org.drools.workbench.models.datamodel.oracle.DateConverter;
import org.kie.workbench.common.services.shared.preferences.ApplicationPreferences;

/**
 * Convenience class to handle date conversion in a normal JVM (i.e. not running
 * under GWT). Used primarily from JUnit Tests.
 */
public class JVMDateConverter
        implements
        DateConverter {

    private static final String DATE_FORMAT = ApplicationPreferences.getDroolsDateFormat();

    private static final SimpleDateFormat FORMATTER = new SimpleDateFormat( DATE_FORMAT );

    private static DateConverter INSTANCE;

    public static synchronized DateConverter getInstance() {
        if ( INSTANCE == null ) {
            INSTANCE = new JVMDateConverter();
        }
        return INSTANCE;
    }

    private JVMDateConverter() {
    }

    public String format( Date date ) {
        synchronized ( FORMATTER ) {
            return FORMATTER.format( date );
        }
    }

    public Date parse( String text ) {
        try {
            synchronized ( FORMATTER ) {
                return FORMATTER.parse( text );
            }

        } catch ( ParseException pe ) {
        }
        return null;
    }

}
