com.ait.tooling.common.api.flow.Flows Maven / Gradle / Ivy

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/*
   Copyright (c) 2014,2015,2016 Ahome' Innovation Technologies. 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.
   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.ait.tooling.common.api.flow;

import java.io.Serializable;
import java.util.Arrays;
import java.util.List;
import java.util.Objects;

import com.ait.tooling.common.api.java.util.function.Predicate;

public final class Flows implements Serializable
{
    private static final long serialVersionUID = 3013490177528306662L;

    protected Flows()
    {
    }

    public static interface BooleanOp extends Serializable
    {
        public boolean test();
    }

    public static final BooleanOp orOp(final BooleanOp... ops)
    {
        return new OrBooleanOp(Arrays.asList(Objects.requireNonNull(ops)));
    }

    public static final BooleanOp andOp(final BooleanOp... ops)
    {
        return new AndBooleanOp(Arrays.asList(Objects.requireNonNull(ops)));
    }

    public static final BooleanOp notOp(final BooleanOp op)
    {
        Objects.requireNonNull(op);

        return new BooleanOp()
        {
            private static final long serialVersionUID = 3705908438801337401L;

            @Override
            public final boolean test()
            {
                return (false == op.test());
            }
        };
    }

    public static final  BooleanOp composeOp(final T value, final Predicate predicate)
    {
        Objects.requireNonNull(predicate);

        return new BooleanOp()
        {
            private static final long serialVersionUID = 6827650384317753155L;

            @Override
            public final boolean test()
            {
                return predicate.test(value);
            }
        };
    }

    @SuppressWarnings("serial")
    public static abstract class PredicateBooleanOp implements BooleanOp, Predicate
    {
        private final T m_value;

        public PredicateBooleanOp(final T value)
        {
            m_value = value;
        }

        @Override
        public final boolean test()
        {
            return test(m_value);
        }
    }

    private static final class OrBooleanOp implements BooleanOp
    {
        private static final long serialVersionUID = 6587934314073977830L;

        final List     m_list;

        public OrBooleanOp(final List list)
        {
            m_list = Objects.requireNonNull(list);
        }

        @Override
        public final boolean test()
        {
            final int size = m_list.size();

            for (int i = 0; i < size; i++)
            {
                if (m_list.get(i).test())
                {
                    return true;
                }
            }
            return false;
        }
    }

    private static final class AndBooleanOp implements BooleanOp
    {
        private static final long serialVersionUID = 6347981775849160893L;

        final List     m_list;

        public AndBooleanOp(final List list)
        {
            m_list = Objects.requireNonNull(list);
        }

        @Override
        public final boolean test()
        {
            final int size = m_list.size();

            for (int i = 0; i < size; i++)
            {
                if (false == m_list.get(i).test())
                {
                    return false;
                }
            }
            return true;
        }
    }
}