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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2018-2022 Saxonica Limited
// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
// If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
// This Source Code Form is "Incompatible With Secondary Licenses", as defined by the Mozilla Public License, v. 2.0.
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

package net.sf.saxon.z;

/**
 * An implementation of IntPredicate that tests whether a given integer is a member
 * of some IntSet
 */
public class IntSetPredicate implements IntPredicateProxy {

    private final IntSet set;

    public IntSetPredicate(IntSet set) {
        if (set == null) {
            throw new NullPointerException();
        }
        this.set = set;
    }

    /**
     * Ask whether a given value matches this predicate
     *
     * @param value the value to be tested
     * @return true if the value matches; false if it does not
     */
    @Override
    public boolean test(int value) {
        return set.contains(value);
    }

    /**
     * Get the underlying IntSet
     *
     * @return the underlying IntSet
     */

    public IntSet getIntSet() {
        return set;
    }

    /**
     * Get string representation
     */

    public String toString() {
        return "in {" + set + "}";
    }

    /**
     * Convenience predicate that always matches
     */

    public final static IntPredicateProxy ALWAYS_TRUE = IntPredicateLambda.of(i -> true);

    /**
     * Convenience predicate that never matches
     */

    public final static IntPredicateProxy ALWAYS_FALSE = IntPredicateLambda.of(i -> false);

}