Values.java

/*
 * Copyright 2016 Red Hat, Inc. and/or its affiliates.
 *
 * 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 org.drools.workbench.services.verifier.api.client.index.keys;

import java.util.HashSet;

import static java.util.stream.Collectors.joining;

public class Values<T extends Comparable>
        extends HashSet<T> {

    public Values( final Comparable... list ) {
        super();

        for ( final Comparable comparable : list ) {
            add( ( T ) comparable );
        }
    }

    public Values() {
    }

    @Override
    public String toString() {
        return stream().map( Object::toString ).collect( joining(", ") );
    }

    public boolean isThereChanges( final Values otherValues ) {
        if ( this.isEmpty() && !otherValues.isEmpty() ) {
            return true;
        } else if ( !this.isEmpty() && otherValues.isEmpty() ) {
            return true;
        } else if ( this.isEmpty() && otherValues.isEmpty() ) {
            return false;
        } else if ( this.size() != otherValues.size() ) {
            return true;
        } else if ( !areValuesEqual( otherValues ) ) {
            return true;
        } else {
            return false;
        }
    }

    private boolean areValuesEqual( final Values otherValues ) {

        if ( !otherValues.containsAll( this ) ) {
            return false;
        }

        if ( !containsAll( otherValues ) ) {
            return false;
        }

        return true;
    }

    public boolean containsAny( final Values values ) {
        for ( final Object value : values ) {
            if ( contains( value ) ) {
                return true;
            }
        }

        return false;
    }

    public static <T extends Comparable> Values<T> nullValue() {
        final Values<T> comparables = new Values<>();
        comparables.add( null );
        return comparables;
    }
}