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94 lines
2.9 KiB
Java
94 lines
2.9 KiB
Java
// Copyright 2016 The Nomulus Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package google.registry.testing;
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import static com.google.common.base.Preconditions.checkNotNull;
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import static com.google.common.base.Preconditions.checkState;
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import com.google.common.base.Optional;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import javax.annotation.Nullable;
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import org.junit.rules.ExternalResource;
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/**
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* JUnit Rule for overriding the values Java system properties during tests.
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*/
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public final class SystemPropertyRule extends ExternalResource {
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/** Class representing a system property key value pair. */
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private static class Property {
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final String key;
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final Optional<String> value;
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Property(String key, Optional<String> value) {
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this.key = checkNotNull(key, "key");
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this.value = checkNotNull(value, "value");
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}
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void set() {
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if (value.isPresent()) {
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System.setProperty(key, value.get());
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} else {
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System.clearProperty(key);
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}
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}
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}
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private boolean isRunning = false;
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private final List<Property> pendings = new ArrayList<>();
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private final Map<String, Property> originals = new HashMap<>();
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/**
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* Change the value of a system property which is restored to its original value after the test.
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*
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* <p>It's safe to call this method multiple times with the same {@code key} within a single
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* test. Only the truly original property value will be restored at the end.
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*
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* <p>This method can be called fluently when declaring the Rule field, or within a Test method.
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*
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* @see java.lang.System#setProperty(String, String)
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*/
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public SystemPropertyRule override(String key, @Nullable String value) {
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if (!originals.containsKey(key)) {
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originals.put(key, new Property(key, Optional.fromNullable(System.getProperty(key))));
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}
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Property property = new Property(key, Optional.fromNullable(value));
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if (isRunning) {
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property.set();
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} else {
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pendings.add(property);
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}
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return this;
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}
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@Override
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protected void before() throws Exception {
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checkState(!isRunning);
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for (Property pending : pendings) {
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pending.set();
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}
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isRunning = true;
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}
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@Override
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protected void after() {
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for (Property original : originals.values()) {
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original.set();
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}
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}
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}
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