/*
 * 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 org.apache.openjpa.conf;

import java.util.ArrayList;
import java.util.List;

import org.apache.openjpa.kernel.AutoDetach;
import org.apache.openjpa.lib.conf.StringListValue;

/**
 * Value type used to represent auto detach flags. Separate to
 * optimize translation of Strings to bit flags.
 *
 * @author Steve Kim
 */
class AutoDetachValue
    extends StringListValue {

    public static final String DETACH_CLOSE = "close";
    public static final String DETACH_COMMIT = "commit";
    public static final String DETACH_ROLLBACK= "rollback";
    public static final String DETACH_NONTXREAD = "nontx-read";
    public static final String DETACH_NONE = "none";

    private static String[] ALIASES = new String[]{
        DETACH_CLOSE, String.valueOf(AutoDetach.DETACH_CLOSE),
        DETACH_COMMIT, String.valueOf(AutoDetach.DETACH_COMMIT),
        DETACH_NONTXREAD, String.valueOf(AutoDetach.DETACH_NONTXREAD),
        DETACH_ROLLBACK, String.valueOf(AutoDetach.DETACH_ROLLBACK),
        DETACH_NONE, String.valueOf(AutoDetach.DETACH_NONE),
        // for compatibility with JDO DetachAllOnCommit
        "true", String.valueOf(AutoDetach.DETACH_COMMIT),
        "false", "0",
    };
    
    private int _flags;
    private boolean _flagsSet;

    public AutoDetachValue() {
        super("AutoDetach");
        setAliases(ALIASES);
        setAliasListComprehensive(true);
    }

    public Class getValueType() {
        return String[].class;
    }

    public void setConstant(int flags) {
        _flags = flags;
    }

    public int getConstant() {
        if (!_flagsSet) {
            String[] vals = get();
            for (int i = 0; i < vals.length; i++)
                _flags |= Integer.parseInt(unalias(vals[i]));
            _flagsSet = true;
        }
            
        return _flags;
    }

    protected List<String> getAliasList() {
        // We do not document the numeric values and they are not
        // helpful to someone trying to understand the error message
        ArrayList<String> list = new ArrayList<String>();
        for (int x = 0; x < ALIASES.length; x += 2)
            list.add(ALIASES[x]);
        return list;
    }
}
