com.b2international.snowowl.datastore.converter.BaseResourceConverter.java Source code

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Here is the source code for com.b2international.snowowl.datastore.converter.BaseResourceConverter.java

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/*
 * Copyright 2011-2018 B2i Healthcare Pte Ltd, http://b2i.sg
 * 
 * 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 com.b2international.snowowl.datastore.converter;

import static com.google.common.base.Preconditions.checkNotNull;

import java.util.Collection;
import java.util.Collections;
import java.util.Date;
import java.util.List;
import java.util.stream.Collectors;

import com.b2international.commons.http.ExtendedLocale;
import com.b2international.commons.options.Options;
import com.b2international.commons.options.OptionsBuilder;
import com.b2international.snowowl.core.date.EffectiveTimes;
import com.b2international.snowowl.core.domain.CollectionResource;
import com.b2international.snowowl.core.domain.RepositoryContext;
import com.google.common.collect.Iterables;

/**
 * @since 4.0
 * @param <T>
 * @param <R>
 * @param <CR>
 */
public abstract class BaseResourceConverter<T, R, CR extends CollectionResource<R>>
        implements ResourceConverter<T, R, CR> {

    private final RepositoryContext context;
    private final Options expand;
    private final List<ExtendedLocale> locales;

    protected BaseResourceConverter(RepositoryContext context, Options expand, List<ExtendedLocale> locales) {
        this.context = checkNotNull(context, "context");
        this.expand = expand == null ? OptionsBuilder.newBuilder().build() : expand;
        this.locales = locales == null ? Collections.<ExtendedLocale>emptyList() : locales;
    }

    protected final Options expand() {
        return expand;
    }

    protected RepositoryContext context() {
        return context;
    }

    protected final List<ExtendedLocale> locales() {
        return locales;
    }

    @Override
    public final R convert(T component) {
        return Iterables.getOnlyElement(convert(Collections.singleton(component), null, null, 1, 1));
    }

    @Override
    public final CR convert(Collection<T> components, String scrollId, String searchAfter, int limit, int total) {
        final List<R> results = components.stream().map(this::toResource).collect(Collectors.toList());

        expand(results);

        return createCollectionResource(results, scrollId, searchAfter, limit, total);
    }

    protected abstract CR createCollectionResource(List<R> results, String scrollId, String searchAfter, int limit,
            int total);

    /**
     * Subclasses may override to expand resources based on the {@link #expand()} list.
     * 
     * @param results
     */
    protected void expand(List<R> results) {
    }

    protected abstract R toResource(T entry);

    protected final Date toEffectiveTime(final long effectiveTimeAsLong) {
        return EffectiveTimes.toDate(effectiveTimeAsLong);
    }

    protected final int getLimit(final Options expandOptions) {
        return expandOptions.containsKey("limit") ? expandOptions.get("limit", Integer.class) : 50;
    }

}