| 1 | /** |
| 2 | * Licensed to jclouds, Inc. (jclouds) under one or more |
| 3 | * contributor license agreements. See the NOTICE file |
| 4 | * distributed with this work for additional information |
| 5 | * regarding copyright ownership. jclouds licenses this file |
| 6 | * to you under the Apache License, Version 2.0 (the |
| 7 | * "License"); you may not use this file except in compliance |
| 8 | * with the License. You may obtain a copy of the License at |
| 9 | * |
| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 11 | * |
| 12 | * Unless required by applicable law or agreed to in writing, |
| 13 | * software distributed under the License is distributed on an |
| 14 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| 15 | * KIND, either express or implied. See the License for the |
| 16 | * specific language governing permissions and limitations |
| 17 | * under the License. |
| 18 | */ |
| 19 | package org.jclouds.rest; |
| 20 | |
| 21 | import static com.google.common.base.Preconditions.checkArgument; |
| 22 | import static com.google.common.base.Predicates.notNull; |
| 23 | import static com.google.common.base.Throwables.propagate; |
| 24 | import static com.google.common.collect.Iterables.filter; |
| 25 | import static com.google.common.collect.Iterables.get; |
| 26 | import static com.google.common.collect.Iterables.transform; |
| 27 | |
| 28 | import java.io.IOException; |
| 29 | import java.lang.reflect.InvocationTargetException; |
| 30 | import java.util.Map; |
| 31 | import java.util.Map.Entry; |
| 32 | import java.util.Properties; |
| 33 | |
| 34 | import org.jclouds.javax.annotation.Nullable; |
| 35 | |
| 36 | import org.jclouds.PropertiesBuilder; |
| 37 | import org.jclouds.util.SaxUtils; |
| 38 | |
| 39 | import com.google.common.base.Function; |
| 40 | import com.google.common.base.Predicate; |
| 41 | import com.google.common.base.Splitter; |
| 42 | |
| 43 | /** |
| 44 | * |
| 45 | * @author Adrian Cole |
| 46 | */ |
| 47 | public class Providers { |
| 48 | |
| 49 | /** |
| 50 | * Gets a set of supported providers. Idea stolen from pallets (supported-clouds). Uses |
| 51 | * rest.properties to populate the set. |
| 52 | * |
| 53 | */ |
| 54 | public static Iterable<String> getSupportedProviders() { |
| 55 | return Providers.getSupportedProvidersOfType(RestContextBuilder.class); |
| 56 | } |
| 57 | |
| 58 | /** |
| 59 | * Gets a set of supported providers. Idea stolen from pallets (supported-clouds). Uses |
| 60 | * rest.properties to populate the set. |
| 61 | * |
| 62 | */ |
| 63 | public static Iterable<String> getSupportedProvidersOfType( |
| 64 | @SuppressWarnings("rawtypes") Class<? extends RestContextBuilder> type) { |
| 65 | Properties properties = new Properties(); |
| 66 | try { |
| 67 | properties.load(SaxUtils.class.getResourceAsStream("/rest.properties")); |
| 68 | } catch (IOException e) { |
| 69 | throw new RuntimeException(e); |
| 70 | } |
| 71 | return Providers.getSupportedProvidersOfTypeInProperties(type, properties); |
| 72 | } |
| 73 | |
| 74 | public static Iterable<String> getSupportedProvidersOfTypeInProperties( |
| 75 | @SuppressWarnings("rawtypes") final Class<? extends RestContextBuilder> type, final Properties properties) { |
| 76 | return filter(transform(filter(properties.entrySet(), new Predicate<Map.Entry<Object, Object>>() { |
| 77 | |
| 78 | @Override |
| 79 | public boolean apply(Entry<Object, Object> input) { |
| 80 | String keyString = input.getKey().toString(); |
| 81 | return keyString.endsWith(".contextbuilder") || keyString.endsWith(".sync"); |
| 82 | } |
| 83 | |
| 84 | }), new Function<Map.Entry<Object, Object>, String>() { |
| 85 | |
| 86 | @Override |
| 87 | public String apply(Entry<Object, Object> from) { |
| 88 | String keyString = from.getKey().toString(); |
| 89 | try { |
| 90 | String provider = get(Splitter.on('.').split(keyString), 0); |
| 91 | Class<RestContextBuilder<Object, Object>> clazz = Providers.resolveContextBuilderClass(provider, |
| 92 | properties); |
| 93 | if (type.isAssignableFrom(clazz)) |
| 94 | return provider; |
| 95 | } catch (ClassNotFoundException e) { |
| 96 | } catch (Exception e) { |
| 97 | propagate(e); |
| 98 | } |
| 99 | return null; |
| 100 | } |
| 101 | |
| 102 | }), notNull()); |
| 103 | } |
| 104 | |
| 105 | @SuppressWarnings("unchecked") |
| 106 | public static <S, A> Class<RestContextBuilder<S, A>> resolveContextBuilderClass(String provider, |
| 107 | Properties properties) throws ClassNotFoundException, IllegalArgumentException, SecurityException, |
| 108 | InstantiationException, IllegalAccessException, InvocationTargetException, NoSuchMethodException { |
| 109 | String contextBuilderClassName = properties.getProperty(provider + ".contextbuilder"); |
| 110 | String syncClassName = properties.getProperty(provider + ".sync"); |
| 111 | String asyncClassName = properties.getProperty(provider + ".async"); |
| 112 | if (syncClassName != null) { |
| 113 | checkArgument(asyncClassName != null, "please configure async class for " + syncClassName); |
| 114 | Class.forName(syncClassName); |
| 115 | Class.forName(asyncClassName); |
| 116 | return (Class<RestContextBuilder<S, A>>) (contextBuilderClassName != null ? Class |
| 117 | .forName(contextBuilderClassName) : RestContextBuilder.class); |
| 118 | } else { |
| 119 | checkArgument(contextBuilderClassName != null, "please configure contextbuilder class for " + provider); |
| 120 | return (Class<RestContextBuilder<S, A>>) Class.forName(contextBuilderClassName); |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | public static <S, A> RestContextBuilder<S, A> initContextBuilder( |
| 125 | Class<RestContextBuilder<S, A>> contextBuilderClass, @Nullable Class<S> sync, @Nullable Class<A> async, |
| 126 | Properties properties) throws ClassNotFoundException, IllegalArgumentException, SecurityException, |
| 127 | InstantiationException, IllegalAccessException, InvocationTargetException, NoSuchMethodException { |
| 128 | checkArgument(properties != null, "please configure properties for " + contextBuilderClass); |
| 129 | try { |
| 130 | return (RestContextBuilder<S, A>) contextBuilderClass.getConstructor(Properties.class).newInstance(properties); |
| 131 | } catch (NoSuchMethodException e) { |
| 132 | checkArgument(sync != null, "please configure sync class for " + contextBuilderClass); |
| 133 | checkArgument(async != null, "please configure async class for " + contextBuilderClass); |
| 134 | return (RestContextBuilder<S, A>) contextBuilderClass.getConstructor(sync.getClass(), async.getClass(), |
| 135 | Properties.class).newInstance(sync, async, properties); |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | @SuppressWarnings("unchecked") |
| 140 | public static Class<PropertiesBuilder> resolvePropertiesBuilderClass(String providerName, Properties props) |
| 141 | throws ClassNotFoundException, InstantiationException, IllegalAccessException, InvocationTargetException, |
| 142 | NoSuchMethodException { |
| 143 | String propertiesBuilderClassName = props.getProperty(providerName + ".propertiesbuilder", null); |
| 144 | if (propertiesBuilderClassName != null) { |
| 145 | return (Class<PropertiesBuilder>) Class.forName(propertiesBuilderClassName); |
| 146 | } else { |
| 147 | return PropertiesBuilder.class; |
| 148 | } |
| 149 | } |
| 150 | |
| 151 | } |