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A distributed lock backed by MongoDB

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/**
 * Copyright 2011, Deft Labs.
 *
 * 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 com.deftlabs.lock.mongo.impl;

/**
 * The lock states.
 */
enum LockState {

    LOCKED("locked"),
    UNLOCKED("unlocked");

    private LockState(final String pCode) { _code = pCode; }
    private final String _code;

    public String code() { return _code; }

    public boolean isLocked() { return this == LOCKED; }
    public boolean isUnlocked() { return this == UNLOCKED; }

    public static LockState findByCode(final String pCode) {
        if (pCode == null) throw new IllegalArgumentException("Invalid lock state code: " + pCode);
        for (final LockState s : values()) if (s._code.equals(pCode)) return s;
        throw new IllegalArgumentException("Invalid lock state code: " + pCode);
    }
}