All Downloads are FREE. Search and download functionalities are using the official Maven repository.
  • Log In
  • Register

    • com.salesforce.jgrapht.util.SupplierUtil Maven / Gradle / Ivy

    Go to download

    This project contains the apt processor that implements all the checks enumerated in @Verify. It is a self contained, and shaded jar.

    The newest version!
    /*
 * (C) Copyright 2018-2018, by Dimitrios Michail and Contributors.
 *
 * JGraphT : a free Java graph-theory library
 *
 * See the CONTRIBUTORS.md file distributed with this work for additional
 * information regarding copyright ownership.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0, or the
 * GNU Lesser General Public License v2.1 or later
 * which is available at
 * http://www.gnu.org/licenses/old-licenses/lgpl-2.1-standalone.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR LGPL-2.1-or-later
 */
package com.salesforce.jgrapht.util;

import com.salesforce.jgrapht.graph.*;

import java.io.*;
import java.util.*;
import java.util.function.*;

/**
 * Helper class for suppliers.
 *
 * @author Dimitrios Michail
 */
public class SupplierUtil
{

    /**
     * Supplier for {@link DefaultEdge}.
     */
    public static final Supplier DEFAULT_EDGE_SUPPLIER =
        createSupplier(DefaultEdge.class);

    /**
     * Supplier for {@link DefaultWeightedEdge}.
     */
    public static final Supplier DEFAULT_WEIGHTED_EDGE_SUPPLIER =
        createSupplier(DefaultWeightedEdge.class);

    /**
     * Supplier for {@link Object}.
     */
    public static final Supplier OBJECT_SUPPLIER = createSupplier(Object.class);

    /**
     * Create a supplier from a class which calls the default constructor.
     * 
     * @param clazz the class
     * @return the supplier
     * @param  the type of results supplied by this supplier
     */
    public static  Supplier createSupplier(Class clazz)
    {
        return (Supplier & Serializable) () -> {
            try {
                return clazz.getDeclaredConstructor().newInstance();
            } catch (Exception ex) {
                throw new RuntimeException("Supplier failed", ex);
            }
        };
    }

    /**
     * Create a default edge supplier.
     * 
     * @return a default edge supplier
     */
    public static Supplier createDefaultEdgeSupplier()
    {
        return createSupplier(DefaultEdge.class);
    }

    /**
     * Create a default weighted edge supplier.
     * 
     * @return a default weighted edge supplier
     */
    public static Supplier createDefaultWeightedEdgeSupplier()
    {
        return createSupplier(DefaultWeightedEdge.class);
    }

    /**
     * Create an integer supplier which returns a sequence starting from zero.
     * 
     * @return an integer supplier
     */
    public static Supplier createIntegerSupplier()
    {
        return new IntegerSupplier(0);
    }

    /**
     * Create an integer supplier which returns a sequence starting from a specific numbers.
     * 
     * @param start where to start the sequence
     * @return an integer supplier
     */
    public static Supplier createIntegerSupplier(int start)
    {
        return new IntegerSupplier(start);
    }

    /**
     * Create a long supplier which returns a sequence starting from zero.
     * 
     * @return a long supplier
     */
    public static Supplier createLongSupplier()
    {
        return new LongSupplier(0);
    }

    /**
     * Create a long supplier which returns a sequence starting from a specific numbers.
     * 
     * @param start where to start the sequence
     * @return a long supplier
     */
    public static Supplier createLongSupplier(long start)
    {
        return new LongSupplier(start);
    }

    /**
     * Create a string supplier which returns unique strings. The returns strings are simply
     * integers starting from zero.
     * 
     * @return a string supplier
     */
    public static Supplier createStringSupplier()
    {
        return new StringSupplier(0);
    }

    /**
     * Create a string supplier which returns random UUIDs.
     * 
     * @return a string supplier
     */
    public static Supplier createRandomUUIDStringSupplier()
    {
        return new RandomUUIDStringSupplier();
    }

    /**
     * Create a string supplier which returns unique strings. The returns strings are simply
     * integers starting from start.
     * 
     * @param start where to start the sequence
     * @return a string supplier
     */
    public static Supplier createStringSupplier(int start)
    {
        return new StringSupplier(start);
    }

    private static class IntegerSupplier
        implements
        Supplier,
        Serializable
    {
        private static final long serialVersionUID = -4714266728630636497L;

        private int i = 0;

        public IntegerSupplier(int start)
        {
            this.i = start;
        }

        @Override
        public Integer get()
        {
            return i++;
        }
    }

    private static class LongSupplier
        implements
        Supplier,
        Serializable
    {
        private static final long serialVersionUID = 4994477932143967277L;

        private long i = 0;

        public LongSupplier(long start)
        {
            this.i = start;
        }

        @Override
        public Long get()
        {
            return i++;
        }
    }

    private static class StringSupplier
        implements
        Supplier,
        Serializable
    {
        private static final long serialVersionUID = -5025488316341437260L;

        private int i = 0;

        public StringSupplier(int start)
        {
            this.i = start;
        }

        @Override
        public String get()
        {
            return String.valueOf(i++);
        }
    }

    private static class RandomUUIDStringSupplier
        implements
        Supplier,
        Serializable
    {
        private static final long serialVersionUID = -4636552536822031851L;

        @Override
        public String get()
        {
            return UUID.randomUUID().toString();
        }
    }

}
    
    
    
    

    




    
    
    © 2015 - 2025 Weber Informatics LLC | Privacy Policy