/*
 * Copyright (c) 2016 Goldman Sachs.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * and Eclipse Distribution License v. 1.0 which accompany this distribution.
 * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 */

package org.eclipse.collections.impl.block.factory;

import org.eclipse.collections.api.block.function.Function;
import org.eclipse.collections.api.block.function.Function3;
import org.eclipse.collections.api.block.predicate.Predicate2;
import org.eclipse.collections.impl.block.predicate.checked.CheckedPredicate2;
import org.eclipse.collections.impl.block.predicate.checked.ThrowingPredicate2;
import org.eclipse.collections.impl.utility.Iterate;

Predicates2 is a static version of Predicates.  All of its values are statically initialized, with the exception
of and, or, not and all of the attribute combination methods.  Predicates2 can only work with one parameter,
so it is limited to handling only conditions of a simple nature.
/**
 * Predicates2 is a static version of Predicates.  All of its values are statically initialized, with the exception
 * of and, or, not and all of the attribute combination methods.  Predicates2 can only work with one parameter,
 * so it is limited to handling only conditions of a simple nature.
 */
public abstract class Predicates2<T, P>
        implements Predicate2<T, P>
{
    private static final long serialVersionUID = 1L;
    private static final Predicates2<Object, Object> NOT_EQUAL = new NotEqual();
    private static final Predicates2<Object, Iterable<?>> IN = new In();
    private static final Predicates2<Object, Object> EQUAL = new Equal();
    private static final Predicates2<Object, Iterable<?>> NOT_IN = new NotIn();
    private static final Predicates2<?, ?> LESS_THAN = new LessThan();
    private static final Predicates2<?, ?> LESS_THAN_OR_EQUAL = new LessThanOrEqual();
    private static final Predicates2<?, ?> GREATER_THAN = new GreaterThan();
    private static final Predicates2<?, ?> GREATER_THAN_OR_EQUAL = new GreaterThanOrEqual();
    private static final Predicates2<Object, Class<?>> INSTANCE_OF = new IsInstanceOf();
    private static final Predicates2<Object, Object> IS_IDENTICAL = new IsIdentical();
    private static final Predicates2<Object, Object> NOT_IDENTITICAL = new NotIdentitical();
    private static final Predicates2<Object, Class<?>> NOT_INSTANCE_OF = new NotInstanceOf();
    private static final Predicates2<Object, Object> ALWAYS_TRUE = new AlwaysTrue();
    private static final Predicates2<Object, Object> ALWAYS_FALSE = new AlwaysFalse();
    private static final Predicates2<Object, Object> IS_NULL = new IsNull();
    private static final Predicates2<Object, Object> NOT_NULL = new NotNull();

    public Predicates2<T, P> and(Predicate2<? super T, ? super P> op)
    {
        return Predicates2.and(this, op);
    }

    public Predicates2<T, P> or(Predicate2<? super T, ? super P> op)
    {
        return Predicates2.or(this, op);
    }

    
Allows a lambda or anonymous inner class that needs to throw a checked exception to be safely wrapped as a
Predicate2 that will throw a RuntimeException, wrapping the checked exception that is the cause.
/**
     * Allows a lambda or anonymous inner class that needs to throw a checked exception to be safely wrapped as a
     * Predicate2 that will throw a RuntimeException, wrapping the checked exception that is the cause.
     */
    public static <T, P> Predicate2<T, P> throwing(ThrowingPredicate2<T, P> throwingPredicate2)
    {
        return new ThrowingPredicate2Adapter<>(throwingPredicate2);
    }

    
Allows a lambda or anonymous inner class that needs to throw a checked exception to be safely wrapped as a
Procedure2 that will throw a user specified RuntimeException based on the provided function. The function
is passed the current element and the checked exception that was thrown as context arguments.
/**
     * Allows a lambda or anonymous inner class that needs to throw a checked exception to be safely wrapped as a
     * Procedure2 that will throw a user specified RuntimeException based on the provided function. The function
     * is passed the current element and the checked exception that was thrown as context arguments.
     */
    public static <T1, T2> Predicate2<T1, T2> throwing(
            ThrowingPredicate2<T1, T2> throwingPredicate2,
            Function3<T1, T2, ? super Throwable, ? extends RuntimeException> rethrow)
    {
        return (one, two) ->
        {
            try
            {
                return throwingPredicate2.safeAccept(one, two);
            }
            catch (RuntimeException e)
            {
                throw e;
            }
            catch (Throwable t)
            {
                throw rethrow.value(one, two, t);
            }
        };
    }

    public static <T, P> Predicates2<T, P> not(Predicate2<T, P> predicate)
    {
        return new Not<>(predicate);
    }

    public static <T, P> Predicates2<T, P> or(
            Predicate2<? super T, ? super P> left,
            Predicate2<? super T, ? super P> right)
    {
        return new Or<>(left, right);
    }

    public static <T, P> Predicates2<T, P> and(
            Predicate2<? super T, ? super P> left,
            Predicate2<? super T, ? super P> right)
    {
        return new And<>(left, right);
    }

    public static <T> Predicates2<T, Iterable<?>> attributeIn(Function<T, ?> function)
    {
        return new AttributePredicates2(function, Predicates2.in());
    }

    public static <T> Predicates2<T, Iterable<?>> attributeNotIn(Function<T, ?> function)
    {
        return new AttributePredicates2(function, Predicates2.notIn());
    }

    public static Predicates2<Object, Object> alwaysTrue()
    {
        return ALWAYS_TRUE;
    }

    public static Predicates2<Object, Object> alwaysFalse()
    {
        return ALWAYS_FALSE;
    }

    public static Predicates2<Object, Object> isNull()
    {
        return IS_NULL;
    }

    public static Predicates2<Object, Object> notNull()
    {
        return NOT_NULL;
    }

    public static Predicates2<Object, Object> equal()
    {
        return EQUAL;
    }

    public static Predicates2<Object, Object> notEqual()
    {
        return NOT_EQUAL;
    }

    public static Predicates2<Object, Iterable<?>> in()
    {
        return IN;
    }

    public static Predicates2<Object, Iterable<?>> notIn()
    {
        return NOT_IN;
    }

    public static <T extends Comparable<T>> Predicates2<T, T> lessThan()
    {
        return (Predicates2<T, T>) LESS_THAN;
    }

    public static <T extends Comparable<T>> Predicates2<T, T> lessThanOrEqualTo()
    {
        return (Predicates2<T, T>) LESS_THAN_OR_EQUAL;
    }

    public static <T extends Comparable<T>> Predicates2<T, T> greaterThan()
    {
        return (Predicates2<T, T>) GREATER_THAN;
    }

    public static Predicates2<Object, Object> sameAs()
    {
        return IS_IDENTICAL;
    }

    public static Predicates2<Object, Object> notSameAs()
    {
        return NOT_IDENTITICAL;
    }

    public static Predicates2<Object, Class<?>> instanceOf()
    {
        return INSTANCE_OF;
    }

    public static Predicates2<Object, Class<?>> notInstanceOf()
    {
        return NOT_INSTANCE_OF;
    }

    public static <T extends Comparable<T>> Predicates2<T, T> greaterThanOrEqualTo()
    {
        return (Predicates2<T, T>) GREATER_THAN_OR_EQUAL;
    }

    public static <T> Predicates2<T, Object> attributeNotEqual(Function<T, ?> function)
    {
        return new AttributePredicates2<>(function, Predicates2.notEqual());
    }

    public static <T, P extends Comparable<? super P>> Predicates2<T, P> attributeLessThan(Function<T, P> function)
    {
        return new AttributePredicates2<>(function, (Predicate2<P, P>) LESS_THAN);
    }

    public static <T, P extends Comparable<? super P>> Predicates2<T, P> attributeLessThanOrEqualTo(
            Function<T, P> function)
    {
        return new AttributePredicates2<>(function, (Predicate2<P, P>) LESS_THAN_OR_EQUAL);
    }

    public static <T, P extends Comparable<? super P>> Predicates2<T, P> attributeGreaterThan(Function<T, P> function)
    {
        return new AttributePredicates2<>(function, (Predicate2<P, P>) GREATER_THAN);
    }

    public static <T, P extends Comparable<? super P>> Predicates2<T, P> attributeGreaterThanOrEqualTo(
            Function<T, P> function)
    {
        return new AttributePredicates2<>(function, (Predicate2<P, P>) GREATER_THAN_OR_EQUAL);
    }

    public static <T> Predicates2<T, Object> attributeEqual(Function<T, ?> function)
    {
        return new AttributePredicates2<>(function, Predicates2.equal());
    }

    private static final class Or<T, P>
            extends Predicates2<T, P>
    {
        private static final long serialVersionUID = 1L;

        private final Predicate2<? super T, ? super P> left;
        private final Predicate2<? super T, ? super P> right;

        private Or(Predicate2<? super T, ? super P> one, Predicate2<? super T, ? super P> two)
        {
            this.left = one;
            this.right = two;
        }

        @Override
        public boolean accept(T each, P injectedValue)
        {
            return this.left.accept(each, injectedValue) || this.right.accept(each, injectedValue);
        }

        @Override
        public String toString()
        {
            return "(" + this.left + " or " + this.right + ')';
        }
    }

    private static final class And<T, P>
            extends Predicates2<T, P>
    {
        private static final long serialVersionUID = 1L;

        private final Predicate2<? super T, ? super P> left;
        private final Predicate2<? super T, ? super P> right;

        private And(Predicate2<? super T, ? super P> one, Predicate2<? super T, ? super P> two)
        {
            this.left = one;
            this.right = two;
        }

        @Override
        public boolean accept(T each, P injectedValue)
        {
            return this.left.accept(each, injectedValue) && this.right.accept(each, injectedValue);
        }

        @Override
        public String toString()
        {
            return "(" + this.left + " and " + this.right + ')';
        }
    }

    private static final class AttributePredicates2<T, P>
            extends Predicates2<T, P>
    {
        private static final long serialVersionUID = 1L;

        private final Function<? super T, ? extends P> function;
        private final Predicate2<? super P, ? super P> predicate;

        private AttributePredicates2(
                Function<? super T, ? extends P> function,
                Predicate2<? super P, ? super P> predicate)
        {
            this.function = function;
            this.predicate = predicate;
        }

        @Override
        public boolean accept(T each, P injectedValue)
        {
            return this.predicate.accept(this.function.valueOf(each), injectedValue);
        }

        @Override
        public String toString()
        {
            return this.function + " " + this.predicate;
        }
    }

    private static final class Not<T, P>
            extends Predicates2<T, P>
    {
        private static final long serialVersionUID = 1L;

        private final Predicate2<T, P> predicate;

        private Not(Predicate2<T, P> predicate)
        {
            this.predicate = predicate;
        }

        @Override
        public boolean accept(T each, P injectedValue)
        {
            return !this.predicate.accept(each, injectedValue);
        }

        @Override
        public String toString()
        {
            return "not " + this.predicate;
        }
    }

    private static final class Equal
            extends Predicates2<Object, Object>
    {
        private static final long serialVersionUID = 1L;

        @Override
        public boolean accept(Object each, Object compareTo)
        {
            if (compareTo == null)
            {
                return each == null;
            }
            return compareTo.equals(each);
        }

        @Override
        public String toString()
        {
            return "= <method parameter>";
        }
    }

    private static final class In
            extends Predicates2<Object, Iterable<?>>
    {
        private static final long serialVersionUID = 1L;

        @Override
        public boolean accept(Object each, Iterable<?> injectedIterable)
        {
            return Iterate.contains(injectedIterable, each);
        }

        @Override
        public String toString()
        {
            return "in <method parameter>";
        }
    }

    private static final class NotIn
            extends Predicates2<Object, Iterable<?>>
    {
        private static final long serialVersionUID = 1L;

        @Override
        public boolean accept(Object each, Iterable<?> injectedIterable)
        {
            return !Iterate.contains(injectedIterable, each);
        }

        @Override
        public String toString()
        {
            return "not in <method parameter>";
        }
    }

    private static class LessThan<T extends Comparable<T>>
            extends Predicates2<T, T>
    {
        private static final long serialVersionUID = 1L;

        @Override
        public boolean accept(T each, T comparison)
        {
            return each.compareTo(comparison) < 0;
        }

        @Override
        public String toString()
        {
            return "< <method parameter>";
        }
    }

    private static class LessThanOrEqual<T extends Comparable<T>>
            extends Predicates2<T, T>
    {
        private static final long serialVersionUID = 1L;

        @Override
        public boolean accept(T each, T comparison)
        {
            return each.compareTo(comparison) <= 0;
        }

        @Override
        public String toString()
        {
            return "<= <method parameter>";
        }
    }

    private static class GreaterThan<T extends Comparable<T>>
            extends Predicates2<T, T>
    {
        private static final long serialVersionUID = 1L;

        @Override
        public boolean accept(T each, T comparison)
        {
            return each.compareTo(comparison) > 0;
        }

        @Override
        public String toString()
        {
            return "> <method parameter>";
        }
    }

    private static class GreaterThanOrEqual<T extends Comparable<T>>
            extends Predicates2<T, T>
    {
        private static final long serialVersionUID = 1L;

        @Override
        public boolean accept(T each, T comparison)
        {
            return each.compareTo(comparison) >= 0;
        }

        @Override
        public String toString()
        {
            return ">= <method parameter>";
        }
    }

    private static final class NotEqual
            extends Predicates2<Object, Object>
    {
        private static final long serialVersionUID = 1L;

        @Override
        public boolean accept(Object each, Object compareTo)
        {
            if (compareTo == null)
            {
                return each != null;
            }
            return !compareTo.equals(each);
        }

        @Override
        public String toString()
        {
            return "not = <method parameter>";
        }
    }

    private static final class IsInstanceOf
            extends Predicates2<Object, Class<?>>
    {
        private static final long serialVersionUID = 1L;

        @Override
        public boolean accept(Object each, Class<?> injectedClass)
        {
            return injectedClass.isInstance(each);
        }

        @Override
        public String toString()
        {
            return "is a(n) <method parameter>";
        }
    }

    private static final class NotInstanceOf
            extends Predicates2<Object, Class<?>>
    {
        private static final long serialVersionUID = 1L;

        @Override
        public boolean accept(Object each, Class<?> injectedClass)
        {
            return !injectedClass.isInstance(each);
        }

        @Override
        public String toString()
        {
            return "is not a(n) <method parameter>";
        }
    }

    private static final class IsIdentical
            extends Predicates2<Object, Object>
    {
        private static final long serialVersionUID = 1L;

        @Override
        public boolean accept(Object each, Object injectedValue)
        {
            return each == injectedValue;
        }

        @Override
        public String toString()
        {
            return "is identical to <method parameter>";
        }
    }

    private static final class NotIdentitical
            extends Predicates2<Object, Object>
    {
        private static final long serialVersionUID = 1L;

        @Override
        public boolean accept(Object each, Object injectedValue)
        {
            return each != injectedValue;
        }

        @Override
        public String toString()
        {
            return "is not identical to <method parameter>";
        }
    }

    private static final class IsNull
            extends Predicates2<Object, Object>
    {
        private static final long serialVersionUID = 1L;

        @Override
        public boolean accept(Object each, Object notImportant)
        {
            return each == null;
        }

        @Override
        public String toString()
        {
            return "is null";
        }
    }

    private static final class NotNull
            extends Predicates2<Object, Object>
    {
        private static final long serialVersionUID = 1L;

        @Override
        public boolean accept(Object each, Object notImportant)
        {
            return each != null;
        }

        @Override
        public String toString()
        {
            return "not null";
        }
    }

    private static final class AlwaysTrue
            extends Predicates2<Object, Object>
    {
        private static final long serialVersionUID = 1L;

        @Override
        public boolean accept(Object each, Object notImportant)
        {
            return true;
        }

        @Override
        public String toString()
        {
            return "always true";
        }
    }

    private static final class AlwaysFalse
            extends Predicates2<Object, Object>
    {
        private static final long serialVersionUID = 1L;

        @Override
        public boolean accept(Object each, Object notImportant)
        {
            return false;
        }

        @Override
        public String toString()
        {
            return "always false";
        }
    }

    private static final class ThrowingPredicate2Adapter<T, P> extends CheckedPredicate2<T, P>
    {
        private static final long serialVersionUID = 1L;
        private final ThrowingPredicate2<T, P> throwingPredicate2;

        private ThrowingPredicate2Adapter(ThrowingPredicate2<T, P> throwingPredicate2)
        {
            this.throwingPredicate2 = throwingPredicate2;
        }

        @Override
        public boolean safeAccept(T object, P param) throws Exception
        {
            return this.throwingPredicate2.safeAccept(object, param);
        }
    }
}