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Utilities for JPA, JDBC and DataSources

There is a newer version: 0.22.J1

/*
 * Copyright 2018 OmniFaces
 *
 * 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.omnifaces.persistence.criteria;

import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.Objects;

import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.Expression;
import javax.persistence.criteria.Predicate;

/**
 * Creates path = number.
 *
 * @author Bauke Scholtz
 */
public final class Numeric extends Criteria {

	private Numeric(Number value) {
		super(value);
	}

	public static Numeric value(Number value) {
		return new Numeric(value);
	}

	public static Numeric parse(Object searchValue, Class targetType) {
		return new Numeric(parseNumber(searchValue, targetType));
	}

	@Override
	public Predicate build(Expression path, CriteriaBuilder criteriaBuilder, ParameterBuilder parameterBuilder) {
		return criteriaBuilder.equal(path, parameterBuilder.create(getValue()));
	}

	@Override
	public boolean applies(Object modelValue) {
		return modelValue != null && Objects.equals(parseNumber(modelValue, getValue().getClass()), getValue());
	}

	private static Number parseNumber(Object searchValue, Class targetType) throws NumberFormatException {
		if (searchValue instanceof Number) {
			return (Number) searchValue;
		}

		try {
			if (BigDecimal.class.isAssignableFrom(targetType)) {
				return new BigDecimal(searchValue.toString());
			}
			else if (BigInteger.class.isAssignableFrom(targetType)) {
				return new BigInteger(searchValue.toString());
			}
			else if (Integer.class.isAssignableFrom(targetType)) {
				return Integer.valueOf(searchValue.toString());
			}
			else {
				return Long.valueOf(searchValue.toString());
			}
		}
		catch (NumberFormatException e) {
			throw new IllegalArgumentException(searchValue.toString(), e);
		}
	}

}