org.kie.io.EntryRecorder.java Source code

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Here is the source code for org.kie.io.EntryRecorder.java

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/*
 * Copyright 2016 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed 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.kie.io;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

import com.google.common.collect.Lists;

public class EntryRecorder {

    private final String fileName;
    private final EntryPagination pagination;

    public EntryRecorder(final String fileName) {
        this.pagination = new EntryPagination();
        this.fileName = fileName;
    }

    public void record(List<Entry> newEntries) {
        final List<Entry> existingEntries = loadExistingEntries();
        final List<Entry> entries = merge(newEntries, existingEntries);

        overrideExistingEntries(entries);
    }

    private List<Entry> merge(final List<Entry> newEntries, final List<Entry> existingEntries) {
        final ArrayList<Entry> entries = new ArrayList<Entry>() {
            {
                addAll(newEntries);
                addAll(existingEntries);
            }
        };

        return entries.stream().distinct().sorted(Entry::compareTo).collect(Collectors.toList());
    }

    List<Entry> loadExistingEntries() {
        return new EntryReader(fileName).getEntries();
    }

    void overrideExistingEntries(final List<Entry> entryList) {
        final List<Entry> entries = Lists.reverse(entryList);

        pagination.paginate(entries, (index, page) -> {
            try {
                new EntryWriter(fileName).record(index, page);
            } catch (IOException e) {
                e.printStackTrace();
            }
        });
    }
}