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Camel Olingo2 component
There is a newer version: 4.8.1
/*
 * 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.apache.camel.component.olingo2;

import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import org.apache.olingo.odata2.api.ep.entry.EntryMetadata;
import org.apache.olingo.odata2.api.ep.entry.ODataEntry;
import org.apache.olingo.odata2.api.ep.feed.FeedMetadata;
import org.apache.olingo.odata2.api.ep.feed.ODataFeed;

public class Olingo2Index {

    private Set resultIndex = new HashSet<>();

    private class EmptyODataFeed implements ODataFeed {

        @Override
        public List getEntries() {
            return Collections.emptyList();
        }

        @Override
        public FeedMetadata getFeedMetadata() {
            return new FeedMetadata() {
                @Override
                public String getDeltaLink() {
                    return null;
                }

                @Override
                public Integer getInlineCount() {
                    return 0;
                }

                @Override
                public String getNextLink() {
                    return null;
                }
            };
        }
    }

    /**
     * Hash only certain data since other parts change between message exchanges.
     *
     * @param  metadata
     * @return          hashcode of metadata
     */
    private int hash(EntryMetadata metadata) {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((metadata.getId() == null) ? 0 : metadata.getId().hashCode());
        result = prime * result + ((metadata.getUri() == null) ? 0 : metadata.getUri().hashCode());
        return result;
    }

    /**
     * Hash entry leaving out certain fields that change between exchange messages
     *
     * @param  entry
     * @return       hascode of entry
     */
    private int hash(ODataEntry entry) {
        final int prime = 31;
        int result = 1;
        // Hash metadata to ignore certain entries
        result = prime * result + ((entry.getMetadata() == null) ? 0 : hash(entry.getMetadata()));
        result = prime * result + ((entry.getProperties() == null) ? 0 : entry.getProperties().hashCode());

        // Ignore mediaMetadata, expandSelectTree since its object changes each
        // time

        return result;
    }

    private Object filter(Object o) {
        if (o == null || resultIndex.contains(o.hashCode())) {
            return null;
        }
        return o;
    }

    private void indexDefault(Object o) {
        if (o == null) {
            return;
        }

        resultIndex.add(o.hashCode());
    }

    private Object filter(ODataEntry entry) {
        if (entry == null || resultIndex.contains(hash(entry))) {
            return null;
        }
        return entry;
    }

    private void index(ODataEntry entry) {
        if (entry == null) {
            return;
        }

        resultIndex.add(hash(entry));
    }

    private Iterable filter(Iterable iterable) {
        List