com.nesscomputing.mojo.numbers.beans.IWFCEnum.java Source code

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Here is the source code for com.nesscomputing.mojo.numbers.beans.IWFCEnum.java

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/**
 * Copyright (C) 2011 Ness Computing, 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 com.nesscomputing.mojo.numbers.beans;

import static java.lang.String.format;

import java.util.Locale;

import com.google.common.base.Preconditions;

import com.nesscomputing.mojo.numbers.util.Log;

public enum IWFCEnum {
    IGNORE, WARN, FAIL, CREATE;

    private static final Log LOG = Log.findLog();

    public static IWFCEnum forString(final String value) {
        Preconditions.checkArgument(value != null, "the value can not be null");
        return valueOf(IWFCEnum.class, value.toUpperCase(Locale.ENGLISH));
    }

    /**
     * Reacts on a given thing existing or not existing.
     *
     * IGNORE: Do nothing.
     * WARN: Display a warning message if the thing does not exist, otherwise do nothing.
     * FAIL: Throws an exception if the thing does not exist.
     * CREATE: Suggest creation of the thing.
     *
     * Returns true if the thing should be create, false otherwise.
     */
    public static boolean checkState(final IWFCEnum iwfc, final boolean exists, final String thing) {
        if (exists || iwfc == IGNORE) {
            return false;
        } else if (iwfc == WARN) {
            LOG.warn("'%s' does not exist!", thing);
            return false;
        } else if (iwfc == FAIL) {
            throw new IllegalStateException(format("'%s' does not exist!", thing));
        } else if (iwfc == CREATE) {
            LOG.debug("'%s' does not exist, suggesting creation.", thing);
            return true;
        } else {
            return false;
        }
    }
}