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5012893c1d
This change renames directories in preparation for the great package rename. The repository is now in a broken state because the code itself hasn't been updated. However this should ensure that git correctly preserves history for each file.
97 lines
2.9 KiB
Java
97 lines
2.9 KiB
Java
// Copyright 2016 The Domain Registry 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 com.google.domain.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 org.junit.rules.ExternalResource;
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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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/**
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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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