/*
 * Copyright 2016 Red Hat, Inc. and/or its affiliates
 * and other contributors as indicated by the @author tags.
 *
 * 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.keycloak.testsuite.util;

import java.io.Closeable;

/**
 * @author <a href="mailto:mposolda@redhat.com">Marek Posolda</a>
 */
public class SetSystemProperty implements Closeable {

    private final String name;
    private final String oldValue;

    public SetSystemProperty(String name, String value) {
        this.name = name;
        this.oldValue = System.getProperty(name);

        if (value == null) {
            if (oldValue != null) {
                System.getProperties().remove(name);
            }
        } else {
            System.setProperty(name, value);
        }
    }

    public void revert() {
        String value = System.getProperty(name);

        if (oldValue == null) {
            if (value != null) {
                System.getProperties().remove(name);
            }
        } else {
            System.setProperty(name, oldValue);
        }
    }

    @Override
    public void close() {
        revert();
    }

}
