org.basepom.mojo.propertyhelper.beans.IgnoreWarnFail.java Source code

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Here is the source code for org.basepom.mojo.propertyhelper.beans.IgnoreWarnFail.java

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/*
 * 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.basepom.mojo.propertyhelper.beans;

import static java.lang.String.format;

import java.util.Locale;

import org.basepom.mojo.propertyhelper.util.Log;

import com.google.common.base.Preconditions;

public enum IgnoreWarnFail {
    IGNORE, WARN, FAIL;

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

    public static IgnoreWarnFail forString(final String value) {
        Preconditions.checkNotNull(value, "the value can not be null");
        return Enum.valueOf(IgnoreWarnFail.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.
     *
     * Returns true if the thing should be create, false otherwise.
     */
    public static void checkState(final IgnoreWarnFail iwf, final boolean exists, final String thing) {
        if (exists) {
            return;
        }

        switch (iwf) {
        case IGNORE:
            return;
        case WARN:
            LOG.warn("'%s' does not exist!", thing);
            break;
        case FAIL:
            throw new IllegalStateException(format("'%s' does not exist!", thing));
        default:
            throw new IllegalStateException("Unknown state: " + iwf);
        }
    }
}