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Case Insensitive Queries with the AEM Query Builder | AEM Community Blog Seeding

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kautuk_sahni

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kautuk_sahni

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kautuk_sahni
Community Manager

15-11-2020

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Case Insensitive Queries with the AEM Query Builder by Perficient Blogs

Abstract

Recently, I needed to perform a query using the AEM Query Builder which was case insensitive. While I normally prefer using JCR SQL2 queries, in this case Query Builder was a better fit as I wanted consuming applications to be able to manipulate the query and doing so as a map is significantly easier than doing so as a string.

I was surprised to find that there was no native Query Builder Predicate for doing case insensitive queries so I ended up writing my own.


The predicate works by lower casing the value and then using the XPath fn:lower-case method to compare to the field value in lower case.

/*
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Anyone is free to copy, modify, publish, use, compile, sell, or
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means.

In jurisdictions that recognize copyright laws, the author or authors
of this software dedicate any and all copyright interest in the
software to the public domain. We make this dedication for the benefit
of the public at large and to the detriment of our heirs and
successors. We intend this dedication to be an overt act of
relinquishment in perpetuity of all present and future rights to this
software under copyright law.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

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*/
package com.perficient.adobe.predicates;

import java.util.Locale;
import java.util.Optional;

import com.day.cq.search.Predicate;
import com.day.cq.search.eval.AbstractPredicateEvaluator;
import com.day.cq.search.eval.EvaluationContext;

import org.osgi.service.component.annotations.Component;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@Component(factory = "com.day.cq.search.eval.PredicateEvaluator/equalsIgnoreCase")
public class CaseInsensitiveEquals extends AbstractPredicateEvaluator {

private static final Logger log = LoggerFactory.getLogger(CaseInsensitiveEquals.class);

static final String PREDICATE_PROPERTY = "property";
static final String PREDICATE_VALUE = "value";
static final String PREDICATE_LOCALE = "locale";

@Override
public String getXPathExpression(Predicate predicate, EvaluationContext context) {
log.debug("Evaluating predicate: {}", predicate);
String property = predicate.get(PREDICATE_PROPERTY);
Locale locale = Optional.ofNullable(predicate.get(PREDICATE_LOCALE)).map(lt -> Locale.forLanguageTag(lt))
.orElse(Locale.getDefault());
String value = predicate.get(PREDICATE_VALUE).toLowerCase(locale).replace("'", "''");
String query = String.format("fn:lower-case(@%s)='%s'", property, value);
log.debug("Generated query: {}", query);
return query;
}
}
Once the custom predicate is available in your application, it can be used in any Query Builder query as such:

path=/content/test
equalsIgnoreCase.property=test
equalsIgnoreCase.value=test
equalsIgnoreCase.locale=en_US

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Case Insensitive Queries with the AEM Query Builder

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