org.jclouds.collect.internal.CallerArg0ToPagedIterable.java Source code

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Here is the source code for org.jclouds.collect.internal.CallerArg0ToPagedIterable.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.collect.internal;

import org.jclouds.collect.IterableWithMarker;
import org.jclouds.collect.PagedIterable;
import org.jclouds.collect.PagedIterables;
import org.jclouds.http.HttpRequest;
import org.jclouds.rest.InvocationContext;
import org.jclouds.rest.internal.GeneratedHttpRequest;

import com.google.common.annotations.Beta;
import com.google.common.base.Function;
import com.google.common.base.Optional;

/**
 * @author Adrian Cole
 * @deprecated Arg0ToPagedIterable.FromCaller
 */
@Beta
@Deprecated
public abstract class CallerArg0ToPagedIterable<T, I extends CallerArg0ToPagedIterable<T, I>>
        implements Function<IterableWithMarker<T>, PagedIterable<T>>, InvocationContext<I> {

    private GeneratedHttpRequest request;

    @Override
    public PagedIterable<T> apply(IterableWithMarker<T> input) {
        if (input.nextMarker() == null)
            return PagedIterables.of(input);

        Optional<String> arg0Option = Optional.absent();
        if (request.getCaller().get().getArgs().size() > 0) {
            Object arg0 = request.getCaller().get().getArgs().get(0);
            if (arg0 != null)
                arg0Option = Optional.of(arg0.toString());
        }
        final String arg0 = arg0Option.orNull();
        return PagedIterables.advance(input, markerToNextForCallingArg0(arg0));
    }

    protected abstract Function<Object, IterableWithMarker<T>> markerToNextForCallingArg0(String arg0);

    @SuppressWarnings("unchecked")
    @Override
    public I setContext(HttpRequest request) {
        this.request = GeneratedHttpRequest.class.cast(request);
        return (I) this;
    }

}