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    • io.github.benas.randombeans.PopulatorContext Maven / Gradle / Ivy

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    /*
 * The MIT License
 *
 *   Copyright (c) 2016, Mahmoud Ben Hassine ([email protected])
 *
 *   Permission is hereby granted, free of charge, to any person obtaining a copy
 *   of this software and associated documentation files (the "Software"), to deal
 *   in the Software without restriction, including without limitation the rights
 *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 *   copies of the Software, and to permit persons to whom the Software is
 *   furnished to do so, subject to the following conditions:
 *
 *   The above copyright notice and this permission notice shall be included in
 *   all copies or substantial portions of the Software.
 *
 *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 *   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 *   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 *   THE SOFTWARE.
 */

package io.github.benas.randombeans;

import io.github.benas.randombeans.api.EnhancedRandom;

import java.lang.reflect.Field;
import java.util.*;

import static java.util.stream.Collectors.toList;

/**
 * Context object for a single call on {@link EnhancedRandom#nextObject(Class, String...)}.
 * It contains a map acting as a cache of populated beans to avoid infinite recursion.
 *
 * @author Rémi Alvergnat ([email protected])
 */
class PopulatorContext {

    static final byte OBJECT_POOL_SIZE = 10;

    private final Set excludedFields;

    private final Map, List> populatedBeans;

    private final Stack stack;

    PopulatorContext(final String... excludedFields) {
        populatedBeans = new IdentityHashMap<>();
        stack = new Stack<>();
        this.excludedFields = new HashSet<>(toLowerCase(Arrays.asList(excludedFields)));
    }

    void addPopulatedBean(final Class type, Object object) {
        List objects = populatedBeans.get(type);
        if (objects == null) {
            objects = new ArrayList<>(OBJECT_POOL_SIZE);
        }
        if (objects.size() < OBJECT_POOL_SIZE) {
            objects.add(object);
        }
        populatedBeans.put(type, objects);
    }

    Object getPopulatedBean(final Class type) {
        int actualPoolSize = populatedBeans.get(type).size();
        int randomIndex = actualPoolSize > 1 ? nextInt(0, actualPoolSize) : 0;
        return populatedBeans.get(type).get(randomIndex);
    }

    boolean hasRandomizedType(final Class type) {
        return populatedBeans.containsKey(type) && populatedBeans.get(type).size() == OBJECT_POOL_SIZE;
    }

    Set getExcludedFields() {
        return excludedFields;
    }

    void pushStackItem(final PopulatorContextStackItem field) {
        stack.push(field);
    }

    void popStackItem() {
        stack.pop();
    }

    String getFieldFullName(final Field field) {
        List pathToField = getStackedFieldNames();
        pathToField.add(field.getName());
        return String.join(".", toLowerCase(pathToField));
    }

    private List getStackedFieldNames() {
        return stack.stream().map(i -> i.getField().getName()).collect(toList());
    }

    private List toLowerCase(final List strings) {
      return strings.stream().map(String::toLowerCase).collect(toList());
    }

    private int nextInt(int startInclusive, int endExclusive) {
      return startInclusive + new Random().nextInt(endExclusive - startInclusive);
    }
}
    
    
    
    

    




    
    
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