org.jclouds.aws.binders.BindMapToIndexedFormParams.java Source code

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Here is the source code for org.jclouds.aws.binders.BindMapToIndexedFormParams.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.aws.binders;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static java.lang.String.format;

import java.util.Map;
import java.util.Map.Entry;

import org.jclouds.http.HttpRequest;
import org.jclouds.rest.Binder;

import com.google.common.base.Function;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;
import com.google.common.collect.Multimap;
import com.google.common.collect.Multimaps;

/**
 * @author Adrian Cole
 */
public class BindMapToIndexedFormParams implements Binder {

    private final String keyPattern;
    private final String valuePattern;

    protected BindMapToIndexedFormParams(String keyPattern, String valuePattern) {
        this.keyPattern = keyPattern;
        this.valuePattern = valuePattern;
    }

    @SuppressWarnings("unchecked")
    @Override
    public <R extends HttpRequest> R bindToRequest(R request, Object input) {
        if (checkNotNull(input, "input") instanceof Iterable)
            input = Maps.uniqueIndex((Iterable<String>) input, new Function<String, String>() {
                int index = 1;

                @Override
                public String apply(String input) {
                    return index++ + "";
                }
            });
        checkArgument(checkNotNull(input, "input") instanceof Map, "this binder is only valid for Map");
        Map<String, String> mapping = (Map<String, String>) input;

        ImmutableMap.Builder<String, String> builder = ImmutableMap.builder();
        int amazonOneBasedIndex = 1; // according to docs, counters must start
                                     // with 1
        for (Entry<String, String> entry : mapping.entrySet()) {
            // not null by contract
            builder.put(format(keyPattern, amazonOneBasedIndex), entry.getKey());
            builder.put(format(valuePattern, amazonOneBasedIndex), entry.getValue());
            amazonOneBasedIndex++;
        }
        Multimap<String, String> forms = Multimaps.forMap(builder.build());
        return forms.size() == 0 ? request : (R) request.toBuilder().replaceFormParams(forms).build();
    }

}