org.jclouds.vcloud.director.v1_5.functions.URNToAdminHref.java Source code

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Here is the source code for org.jclouds.vcloud.director.v1_5.functions.URNToAdminHref.java

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/*
 * 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.vcloud.director.v1_5.functions;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;

import java.net.URI;

import javax.inject.Inject;
import javax.inject.Singleton;

import org.jclouds.javax.annotation.Nullable;
import org.jclouds.vcloud.director.v1_5.domain.Entity;
import org.jclouds.vcloud.director.v1_5.domain.Link;

import com.google.common.base.Function;
import com.google.common.base.Optional;
import com.google.common.base.Predicate;
import com.google.common.cache.LoadingCache;
import com.google.common.collect.Iterables;

/**
 * Resolves URN to its Admin HREF via the entity Resolver
 * 
 * @author Adrian Cole
 */
@Singleton
public final class URNToAdminHref implements Function<Object, URI> {
    private final LoadingCache<String, Entity> resolveEntityCache;

    @Inject
    public URNToAdminHref(LoadingCache<String, Entity> resolveEntityCache) {
        this.resolveEntityCache = checkNotNull(resolveEntityCache, "resolveEntityCache");
    }

    @Override
    public URI apply(@Nullable Object from) {
        checkArgument(checkNotNull(from, "urn") instanceof String, "urn is a String argument");
        Entity entity = resolveEntityCache.getUnchecked(from.toString());
        Optional<Link> link = Iterables.tryFind(entity.getLinks(), typeContainsAdmin);
        checkArgument(link.isPresent(), "no admin link found for entity %s", entity);
        return link.get().getHref();
    }

    private static final Predicate<Link> typeContainsAdmin = new Predicate<Link>() {
        @Override
        public boolean apply(Link in) {
            return in.getType().indexOf(".admin.") != -1;
        }
    };
}