com.github.markserrano.jsonquery.jpa.util.DateTimeZoneRule.java Source code

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Here is the source code for com.github.markserrano.jsonquery.jpa.util.DateTimeZoneRule.java

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/*
 * Copyright 2011-2012 the original author or authors.
 *
 * 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.github.markserrano.jsonquery.jpa.util;

import org.joda.time.DateTimeZone;
import org.junit.rules.MethodRule;
import org.junit.runners.model.*;

import com.github.markserrano.jsonquery.jpa.util.DateTimeZoneModifier;

/**
 * Rule that sets the TimeZone
 *
 * @author Johannes Schneider (<a href="mailto:js@cedarsoft.com">js@cedarsoft.com</a>)
 * @modification Mark Serrano (check for more info: <a href="http://joda-time.sourceforge.net/timezones.html">Joda Time Zones</a>)
 */
public class DateTimeZoneRule implements MethodRule {

    protected final DateTimeZone zone;

    public DateTimeZoneRule() throws IllegalArgumentException {
        this("America/New_York");
    }

    public DateTimeZoneRule(String zoneId) throws IllegalArgumentException {
        this(DateTimeZone.forID(zoneId));
    }

    public DateTimeZoneRule(DateTimeZone zone) {
        this.zone = zone;
    }

    private DateTimeZone oldTimeZone;

    @Override
    public Statement apply(final Statement statement, final FrameworkMethod frameworkMethod, Object target) {
        return new Statement() {
            @Override
            public void evaluate() throws Throwable {
                before();
                try {
                    DateTimeZoneModifier annotation = frameworkMethod.getAnnotation(DateTimeZoneModifier.class);
                    if (annotation == null) {
                        statement.evaluate();
                    } else {
                        DateTimeZone.setDefault(DateTimeZone.forID(annotation.value()));
                    }

                } finally {
                    after();
                }
            }
        };
    }

    private void before() {
        oldTimeZone = DateTimeZone.getDefault();
        DateTimeZone.setDefault(zone);
    }

    private void after() {
        DateTimeZone.setDefault(oldTimeZone);
    }

    public DateTimeZone getZone() {
        return zone;
    }

    public DateTimeZone getOldTimeZone() {
        if (oldTimeZone == null) {
            throw new IllegalStateException("No old zone set");
        }
        return oldTimeZone;
    }
}