/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.nifi.attribute.expression.language.evaluation.functions;
import java.util.Date;
import java.util.Map;
import org.apache.nifi.attribute.expression.language.evaluation.BooleanEvaluator;
import org.apache.nifi.attribute.expression.language.evaluation.BooleanQueryResult;
import org.apache.nifi.attribute.expression.language.evaluation.Evaluator;
import org.apache.nifi.attribute.expression.language.evaluation.QueryResult;
import org.apache.nifi.expression.AttributeExpression.ResultType;
public class EqualsEvaluator extends BooleanEvaluator {
private final Evaluator<?> subject;
private final Evaluator<?> compareTo;
public EqualsEvaluator(final Evaluator<?> subject, final Evaluator<?> compareTo) {
this.subject = subject;
this.compareTo = compareTo;
}
@Override
public QueryResult<Boolean> evaluate(final Map<String, String> attributes) {
final Object a = subject.evaluate(attributes).getValue();
if (a == null) {
return new BooleanQueryResult(false);
}
final Object b = compareTo.evaluate(attributes).getValue();
if (b == null) {
return new BooleanQueryResult(false);
}
if (subject.getResultType() == compareTo.getResultType()) {
return new BooleanQueryResult(a.equals(b));
}
final String normalizedSubjectValue = normalizeValue(subject.getResultType(), a);
if (normalizedSubjectValue == null) {
return new BooleanQueryResult(false);
}
final String normalizedCompareToValue = normalizeValue(compareTo.getResultType(), b);
if (normalizedCompareToValue == null) {
return new BooleanQueryResult(false);
}
return new BooleanQueryResult(normalizedSubjectValue.equals(normalizedCompareToValue));
}
private String normalizeValue(final ResultType type, final Object value) {
if (value == null) {
return null;
}
switch (type) {
case STRING:
return (String) value;
case DATE:
return String.valueOf(((Date) value).getTime());
case BOOLEAN:
case NUMBER:
default:
return String.valueOf(value);
}
}
@Override
public Evaluator<?> getSubjectEvaluator() {
return subject;
}
}