software.amazon.awssdk.codegen.emitters.tasks.PaginatorsGeneratorTasks Maven / Gradle / Ivy

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/*
 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file 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 software.amazon.awssdk.codegen.emitters.tasks;

import static software.amazon.awssdk.utils.FunctionalUtils.safeFunction;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import software.amazon.awssdk.codegen.emitters.GeneratorTask;
import software.amazon.awssdk.codegen.emitters.GeneratorTaskParams;
import software.amazon.awssdk.codegen.emitters.PoetGeneratorTask;
import software.amazon.awssdk.codegen.model.service.PaginatorDefinition;
import software.amazon.awssdk.codegen.poet.ClassSpec;
import software.amazon.awssdk.codegen.poet.paginators.AsyncResponseClassSpec;
import software.amazon.awssdk.codegen.poet.paginators.SyncResponseClassSpec;
import software.amazon.awssdk.codegen.poet.paginators.customizations.SameTokenAsyncResponseClassSpec;
import software.amazon.awssdk.codegen.poet.paginators.customizations.SameTokenSyncResponseClassSpec;

public class PaginatorsGeneratorTasks extends BaseGeneratorTasks {

    private static final String SAME_TOKEN_CUSTOMIZATION = "LastPageHasPreviousToken";

    private final String paginatorsClassDir;
    private final Map customization;

    public PaginatorsGeneratorTasks(GeneratorTaskParams dependencies) {
        super(dependencies);
        this.paginatorsClassDir = dependencies.getPathProvider().getPaginatorsDirectory();
        this.customization = dependencies.getModel().getCustomizationConfig().getPaginationCustomization();
    }

    @Override
    protected boolean hasTasks() {
        return model.hasPaginators();
    }

    @Override
    protected List createTasks() throws Exception {
        return model.getPaginators().entrySet().stream()
                    .filter(entry -> entry.getValue().isValid())
                    .flatMap(safeFunction(this::createSyncAndAsyncTasks))
                    .collect(Collectors.toList());
    }

    private Stream createSyncAndAsyncTasks(Map.Entry entry) throws IOException {
        if (!shouldGenerateSyncPaginators()) {
            return Stream.of(createAsyncTask(entry));
        }
        return Stream.of(createSyncTask(entry), createAsyncTask(entry));
    }

    private GeneratorTask createSyncTask(Map.Entry entry) {
        ClassSpec classSpec = new SyncResponseClassSpec(model, entry.getKey(), entry.getValue());

        if (customization != null && customization.containsKey(entry.getKey())
            && SAME_TOKEN_CUSTOMIZATION.equals(customization.get(entry.getKey()))) {
            classSpec = new SameTokenSyncResponseClassSpec(model, entry.getKey(), entry.getValue());
        }

        return new PoetGeneratorTask(paginatorsClassDir, model.getFileHeader(), classSpec);
    }

    private GeneratorTask createAsyncTask(Map.Entry entry) {
        ClassSpec classSpec = new AsyncResponseClassSpec(model, entry.getKey(), entry.getValue());

        if (customization != null && customization.containsKey(entry.getKey())
            && SAME_TOKEN_CUSTOMIZATION.equals(customization.get(entry.getKey()))) {
            classSpec = new SameTokenAsyncResponseClassSpec(model, entry.getKey(), entry.getValue());
        }

        return new PoetGeneratorTask(paginatorsClassDir, model.getFileHeader(), classSpec);
    }

    private boolean shouldGenerateSyncPaginators() {
        return !super.model.getCustomizationConfig().isSkipSyncClientGeneration();
    }
}