org.jclouds.scriptbuilder.functions.CredentialsFromAdminAccess.java Source code

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Here is the source code for org.jclouds.scriptbuilder.functions.CredentialsFromAdminAccess.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.scriptbuilder.functions;

import java.util.concurrent.atomic.AtomicReference;

import org.jclouds.domain.Credentials;
import org.jclouds.javax.annotation.Nullable;
import org.jclouds.scriptbuilder.domain.AcceptsStatementVisitor;
import org.jclouds.scriptbuilder.domain.Statement;
import org.jclouds.scriptbuilder.domain.StatementVisitor;
import org.jclouds.scriptbuilder.statements.login.AdminAccess;

import com.google.common.base.Function;
import com.google.common.util.concurrent.Atomics;

/**
 * 
 * @author Adrian Cole
 */
public enum CredentialsFromAdminAccess implements Function<Statement, Credentials> {
    INSTANCE;
    @Override
    public Credentials apply(@Nullable Statement input) {
        if (input == null)
            return null;
        if (input instanceof AcceptsStatementVisitor) {
            final AtomicReference<Credentials> credsHolder = Atomics.newReference();
            AcceptsStatementVisitor.class.cast(input).accept(new StatementVisitor() {

                @Override
                public void visit(Statement in) {
                    if (credsHolder.get() == null) {
                        Credentials creds = apply(in);
                        if (creds != null)
                            credsHolder.set(creds);
                    }
                }

            });
            return credsHolder.get();
        } else if (input instanceof AdminAccess) {
            return AdminAccess.class.cast(input).getAdminCredentials();
        } else {
            return null;
        }
    }
}