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GS Collections is a collections framework for Java. It has JDK-compatible List, Set and Map implementations with a rich API and set of utility classes that work with any JDK compatible Collections, Arrays, Maps or Strings. The iteration protocol was inspired by the Smalltalk collection framework.

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/*
 * Copyright 2011 Goldman Sachs.
 *
 * 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.gs.collections.impl.block.factory;

import com.gs.collections.api.block.function.Function;

public final class IntegerPredicates
{
    private static final Predicates IS_ODD = new IntegerIsOdd();
    private static final Predicates IS_EVEN = new IntegerIsEven();
    private static final Predicates IS_POSITIVE = new IntegerIsPositive();
    private static final Predicates IS_NEGATIVE = new IntegerIsNegative();
    private static final Predicates IS_ZERO = new IntegerIsZero();

    private IntegerPredicates()
    {
        throw new AssertionError("Suppress default constructor for noninstantiability");
    }

    public static Predicates isOdd()
    {
        return IS_ODD;
    }

    public static Predicates isEven()
    {
        return IS_EVEN;
    }

    public static Predicates isPositive()
    {
        return IS_POSITIVE;
    }

    public static Predicates isNegative()
    {
        return IS_NEGATIVE;
    }

    public static Predicates isZero()
    {
        return IS_ZERO;
    }

    public static  Predicates attributeIsEven(Function function)
    {
        return Predicates.attributePredicate(function, IntegerPredicates.isEven());
    }

    public static  Predicates attributeIsOdd(Function function)
    {
        return Predicates.attributePredicate(function, IntegerPredicates.isOdd());
    }

    public static  Predicates attributeIsZero(Function function)
    {
        return Predicates.attributePredicate(function, IntegerPredicates.isZero());
    }

    public static  Predicates attributeIsPositive(Function function)
    {
        return Predicates.attributePredicate(function, IntegerPredicates.isPositive());
    }

    public static  Predicates attributeIsNegative(Function function)
    {
        return Predicates.attributePredicate(function, IntegerPredicates.isNegative());
    }

    private static class IntegerIsPositive extends Predicates
    {
        private static final long serialVersionUID = 1L;

        public boolean accept(Integer i)
        {
            return i.intValue() > 0;
        }
    }

    private static class IntegerIsNegative extends Predicates
    {
        private static final long serialVersionUID = 1L;

        public boolean accept(Integer i)
        {
            return i.intValue() < 0;
        }
    }

    private static class IntegerIsZero extends Predicates
    {
        private static final long serialVersionUID = 1L;

        public boolean accept(Integer i)
        {
            return i.intValue() == 0;
        }
    }

    private static class IntegerIsOdd extends Predicates
    {
        private static final long serialVersionUID = 1L;

        public boolean accept(Integer i)
        {
            return i.intValue() % 2 != 0;
        }
    }

    private static class IntegerIsEven extends Predicates
    {
        private static final long serialVersionUID = 1L;

        public boolean accept(Integer i)
        {
            return i.intValue() % 2 == 0;
        }
    }
}