com.speedment.runtime.field.internal.comparator.DoubleFieldComparatorImpl Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of runtime-field Show documentation

Partly generated model of the fields that represent columns in the database. Fields can be used to produce special predicates and functions that contain metadata that Speedment can analyze runtime.

There is a newer version: 3.2.10

Show newest version

/**
 * 
 * Copyright (c) 2006-2017, Speedment, Inc. 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.speedment.runtime.field.internal.comparator;

import com.speedment.common.annotation.GeneratedCode;
import com.speedment.runtime.field.comparator.FieldComparator;
import com.speedment.runtime.field.comparator.NullOrder;
import com.speedment.runtime.field.trait.HasDoubleValue;
import java.util.Objects;
import static com.speedment.common.invariant.NullUtil.requireNonNulls;
import static java.util.Objects.requireNonNull;

/**
 * @param  entity type
 * @param       database type
 * 
 * @author Emil Forslund
 * @since  3.0.0
 */
@GeneratedCode(value = "Speedment")
public final class DoubleFieldComparatorImpl 
extends AbstractFieldComparator 
implements DoubleFieldComparator {
    
    private final HasDoubleValue field;
    private final boolean reversed;
    
    public DoubleFieldComparatorImpl(HasDoubleValue field) {
        this(field, false);
    }
    
    DoubleFieldComparatorImpl(HasDoubleValue field, boolean reversed) {
        this.field    = requireNonNull(field);
        this.reversed = reversed;
    }
    
    @Override
    public HasDoubleValue getField() {
        return field;
    }
    
    @Override
    public NullOrder getNullOrder() {
        return NullOrder.NONE;
    }
    
    @Override
    public boolean isReversed() {
        return reversed;
    }
    
    @Override
    public FieldComparator reversed() {
        return new DoubleFieldComparatorImpl<>(field, !reversed);
    }
    
    @Override
    public int compare(ENTITY first, ENTITY second) {
        requireNonNulls(first, second);
        final double a = field.getAsDouble(first);
        final double b = field.getAsDouble(second);
        return applyReversed(Double.compare(a, b));
    }
    
    @Override
    public int hashCode() {
        return (4049 + Objects.hashCode(this.field.identifier())) * 3109
            + Boolean.hashCode(reversed);
    }
    
    @Override
    public boolean equals(Object obj) {
        if (this == obj) return true;
        if (!(obj instanceof FieldComparator)) return false;
        
        @SuppressWarnings("unchecked")
        final FieldComparator casted =
            (FieldComparator) obj;
        
        return reversed == casted.isReversed()
            && Objects.equals(
                field.identifier(),
                casted.getField().identifier()
            );
    }
    
    @Override
    public String toString() {
        return "(order by " + field.identifier() + " " +
            (reversed ? "descending" : "ascending") + ")";
    }
    
    private int applyReversed(double compare) {
        if (compare == 0) {
            return 0;
        } else {
            if (reversed) {
                if (compare > 0) {
                    return -1;
                } else {
                    return 1;
                }
            } else {
                if (compare > 0) {
                    return 1;
                } else {
                    return -1;
                }
            }
        }
    }
}