| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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.jclouds.internal; |
| import static com.google.common.base.Objects.equal; |
| import static com.google.common.base.Preconditions.checkArgument; |
| import static com.google.common.base.Preconditions.checkNotNull; |
| |
| import java.io.Closeable; |
| |
| import org.jclouds.Context; |
| import org.jclouds.View; |
| import org.jclouds.location.Provider; |
| import org.jclouds.rest.ApiContext; |
| import org.jclouds.util.TypeTokenUtils; |
| |
| import com.google.common.base.MoreObjects; |
| import com.google.common.base.Objects; |
| import com.google.common.base.MoreObjects.ToStringHelper; |
| import com.google.common.collect.ForwardingObject; |
| import com.google.common.reflect.TypeParameter; |
| import com.google.common.reflect.TypeToken; |
| |
| public abstract class BaseView extends ForwardingObject implements View { |
| |
| private final Context backend; |
| private final TypeToken<? extends Context> backendType; |
| |
| protected BaseView(@Provider Context backend, @Provider TypeToken<? extends Context> backendType) { |
| this.backend = checkNotNull(backend, "backend"); |
| this.backendType = checkNotNull(backendType, "backendType"); |
| } |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public <C extends Context> C unwrap(TypeToken<C> type) { |
| checkArgument(TypeTokenUtils.isSupertypeOf(checkNotNull(type, "type"), backendType), "%s is not a supertype of backend type %s", type, backendType); |
| return (C) backend; |
| } |
| |
| @Override |
| public TypeToken<? extends Context> getBackendType() { |
| return backendType; |
| } |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public <C extends Context> C unwrap() throws ClassCastException { |
| return (C) unwrap(getBackendType()); |
| } |
| |
| @Override |
| public <A extends Closeable> A unwrapApi(Class<A> apiClass) { |
| checkArgument(ApiContext.class.isAssignableFrom(backendType.getRawType()), |
| "backend type: %s should be an ApiContext", backendType); |
| TypeToken<ApiContext<? extends A>> contextToken = new TypeToken<ApiContext<? extends A>>(delegate().getClass()) { |
| private static final long serialVersionUID = 1L; |
| }.where(new TypeParameter<A>() { |
| }, TypeToken.of(apiClass)); |
| return unwrap(contextToken).getApi(); |
| } |
| |
| @Override |
| protected Context delegate() { |
| return backend; |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) |
| return true; |
| if (o == null || getClass() != o.getClass()) |
| return false; |
| BaseView that = BaseView.class.cast(o); |
| return equal(this.delegate(), that.delegate()) && equal(this.getBackendType(), that.getBackendType()); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hashCode(delegate(), getBackendType()); |
| } |
| |
| @Override |
| public String toString() { |
| return string().toString(); |
| } |
| |
| protected ToStringHelper string() { |
| return MoreObjects.toStringHelper("").add("backend", delegate()).add("backendType", getBackendType()); |
| } |
| |
| } |