mirror of https://github.com/apache/jclouds.git
added function to get a configuration property without binding to Guice explicitly
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/**
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*
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* Copyright (C) 2011 Cloud Conscious, LLC. <info@cloudconscious.com>
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*
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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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* ====================================================================
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*/
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package org.jclouds.config;
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import static com.google.common.base.Preconditions.checkNotNull;
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import javax.inject.Inject;
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import javax.inject.Singleton;
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import com.google.common.base.Function;
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import com.google.inject.ConfigurationException;
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import com.google.inject.Injector;
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import com.google.inject.Key;
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import com.google.inject.name.Names;
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/**
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*
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* @author Adrian Cole
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*/
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@Singleton
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public class ValueOfConfigurationKeyOrNull implements Function<String, String> {
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protected final Injector injector;
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@Inject
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public ValueOfConfigurationKeyOrNull(Injector injector) {
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this.injector = checkNotNull(injector, "injector");
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}
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@Override
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public String apply(String configurationKey) {
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checkNotNull(configurationKey, "configurationKey");
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try {
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return injector.getInstance(Key.get(String.class, Names.named(configurationKey)));
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} catch (ConfigurationException e) {
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return null;
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}
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}
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}
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@ -0,0 +1,57 @@
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/**
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*
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* Copyright (C) 2011 Cloud Conscious, LLC. <info@cloudconscious.com>
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*
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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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* ====================================================================
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*/
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package org.jclouds.config;
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import static org.testng.Assert.assertEquals;
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import java.util.concurrent.ExecutionException;
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import org.testng.annotations.Test;
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import com.google.inject.AbstractModule;
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import com.google.inject.Guice;
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import com.google.inject.name.Names;
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/**
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* Tests behavior of ValueOfConfigurationKeyOrNull
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*
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* @author Adrian Cole
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*/
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@Test(groups = "unit")
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public class ValueOfConfigurationKeyOrNullTest {
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@Test
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public void testNotThere() throws InterruptedException, ExecutionException {
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assertEquals(new ValueOfConfigurationKeyOrNull(Guice.createInjector()).apply("foo"), null);
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}
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@Test
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public void testThere() throws InterruptedException, ExecutionException {
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assertEquals(new ValueOfConfigurationKeyOrNull(Guice.createInjector(new AbstractModule() {
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@Override
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protected void configure() {
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bindConstant().annotatedWith(Names.named("foo")).to("bar");
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}
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})).apply("foo"), "bar");
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}
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}
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