IsNull.java

package org.dynamoframework.filter;

/*-
 * #%L
 * Dynamo Framework
 * %%
 * Copyright (C) 2014 - 2024 Open Circle Solutions
 * %%
 * 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.
 * #L%
 */

import java.util.Objects;

/**
 * A filter for checking if a property is null
 *
 * @author bas.rutten
 */
public final class IsNull extends AbstractFilter implements PropertyFilter {

	private final String propertyId;

	/**
	 * Constructor
	 *
	 * @param propertyId
	 */
	public IsNull(String propertyId) {
		this.propertyId = propertyId;
	}

	@Override
	public boolean evaluate(Object that) {
		if (null == that) {
			return false;
		}
		return null == getProperty(that, getPropertyId());
	}

	@Override
	public boolean equals(Object obj) {
		if (!(obj instanceof IsNull)) {
			return false;
		}
		IsNull o = (IsNull) obj;

		// Checks the properties one by one
		return Objects.equals(this.propertyId, o.propertyId);
	}

	@Override
	public int hashCode() {
		return Objects.hashCode(propertyId);
	}

	@Override
	public String getPropertyId() {
		return propertyId;
	}

	@Override
	public String toString() {
		return getPropertyId() + " " + super.toString();
	}

}