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Core components to access jclouds services
/*
* 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.providers;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Strings.emptyToNull;
import org.jclouds.Context;
import org.jclouds.View;
import org.jclouds.apis.ApiMetadata;
import org.jclouds.apis.ApiPredicates;
import com.google.common.base.Preconditions;
import com.google.common.base.Predicate;
import com.google.common.base.Predicates;
import com.google.common.reflect.TypeToken;
/**
* Container for provider filters (predicates).
*/
public class ProviderPredicates {
public static class ContextAssignableFrom implements Predicate {
private final TypeToken type;
public ContextAssignableFrom(TypeToken type) {
Preconditions.checkNotNull(type, "context must be defined");
this.type = type;
}
/**
* {@inheritDoc}
*/
@Override
public boolean apply(ProviderMetadata providerMetadata) {
return ApiPredicates.contextAssignableFrom(type).apply(providerMetadata.getApiMetadata());
}
/**
* {@inheritDoc}
*/
@Override
public String toString() {
return "contextAssignableFrom(" + type + ")";
}
}
public static class TransformableTo implements Predicate {
private final TypeToken type;
public TransformableTo(TypeToken type) {
Preconditions.checkNotNull(type, "context must be defined");
this.type = type;
}
/**
* {@inheritDoc}
*/
@Override
public boolean apply(ProviderMetadata providerMetadata) {
return ApiPredicates.viewableAs(type).apply(providerMetadata.getApiMetadata());
}
/**
* {@inheritDoc}
*/
@Override
public String toString() {
return "viewableAs(" + type + ")";
}
}
/**
* Returns all providers available to jclouds regardless of type.
*
* @return all available providers
*/
public static Predicate all() {
return Predicates. alwaysTrue();
}
/**
* Returns all providers with the given id.
*
* @param id
* the id of the provider to return
*
* @return the providers with the given id
*/
public static Predicate id(final String id) {
checkNotNull(emptyToNull(id), "id must be defined");
return new Predicate() {
/**
* {@inheritDoc}
*/
@Override
public boolean apply(ProviderMetadata providerMetadata) {
return providerMetadata.getId().equals(id);
}
/**
* {@inheritDoc}
*/
@Override
public String toString() {
return "id(" + id + ")";
}
};
}
/**
* Returns the providers that are bound to the same location as the given ISO
* 3166 code.
*
* @param isoCode
* the ISO 3166 code to filter providers by
*
* @return the providers with the given ISO 3166 code
*/
public static Predicate boundedByIso3166Code(final String iso3166Code) {
Preconditions.checkNotNull(iso3166Code, "iso3166Code must not be null");
return new Predicate() {
/**
* {@inheritDoc}
*/
@Override
public boolean apply(ProviderMetadata providerMetadata) {
return providerContainsIso3166Code(providerMetadata, iso3166Code);
}
/**
* {@inheritDoc}
*/
@Override
public String toString() {
return "boundedByIso3166Code(" + iso3166Code + ")";
}
};
}
/**
* Return all providers that have at least one ISO 3166 code in common with
* the given provider metadata.
*
* @param refProviderMetadata
* the provider metadata to use to filter providers by
*
* @return the providers that have at least one ISO 3166 code in common
*/
public static Predicate intersectingIso3166Code(
final ProviderMetadata refProviderMetadata) {
Preconditions.checkNotNull(refProviderMetadata, "refProviderMetadata must not be null");
return new Predicate() {
/**
* {@inheritDoc}
*/
@Override
public boolean apply(ProviderMetadata providerMetadata) {
for (String refIso3166Code : refProviderMetadata.getIso3166Codes()) {
// Return only if the potential provider contains the same ISO
// 3166 code and the provider and
// reference provider are not the same.
if (providerContainsIso3166Code(providerMetadata, refIso3166Code)
&& !refProviderMetadata.equals(providerMetadata)) {
return true;
}
}
return false;
}
/**
* {@inheritDoc}
*/
@Override
public String toString() {
return "intersectingIso3166Code(" + refProviderMetadata + ")";
}
};
}
/**
* Returns whether or not the provided provider contains the ISO 3166 code
* provider or is within the same "global" region, like "US" would contain
* "US-*".
*
* @param providerMetadata
* the provider metadata to search
* @param iso3166Code
* the ISO 3166 code to search the provider metadata for
*
* @return the result
*/
private static boolean providerContainsIso3166Code(ProviderMetadata providerMetadata, String iso3166Code) {
for (String availCode : providerMetadata.getIso3166Codes()) {
if (iso3166Code.indexOf('-') == -1) {
if (availCode.startsWith(iso3166Code + "-")) {
return true;
}
} else if (availCode.equals(iso3166Code)) {
return true;
}
}
return false;
}
/**
* Returns all providers with an apimetadata assignable from the given api.
*
* @param apiClass
* the api of the provider to return
*
* @return the providers with an apimetadata assignable from the given api.
*/
public static Predicate apiMetadataAssignableFrom(
final TypeToken apiClass) {
Preconditions.checkNotNull(apiClass, "api must be defined");
return new Predicate() {
/**
* {@inheritDoc}
*/
@Override
public boolean apply(ProviderMetadata providerMetadata) {
return apiClass.isAssignableFrom(providerMetadata.getApiMetadata().getClass());
}
/**
* {@inheritDoc}
*/
@Override
public String toString() {
return "apiAssignableFrom(" + apiClass + ")";
}
};
}
/**
* Returns all providers with an context assignable from the given type.
*
* @param type
* the context of the provider to return
*
* @return the providers with an context assignable from the given type.
*/
public static Predicate contextAssignableFrom(final TypeToken type) {
return new ContextAssignableFrom(type);
}
/**
* Returns all providers with an context transformable to the given type.
*
* @param type
* the context you wish to achieve ex. {@code BlobStoreContext}
*
* @return the providers with an context transformable to from the given type.
*/
public static Predicate viewableAs(final TypeToken type) {
return new TransformableTo(type);
}
}
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