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TB3dock
Level 8
April 24, 2021
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How to combine two ValueMaps?

  • April 24, 2021
  • 2 replies
  • 999 views

trying to combine 2 valuemaps into 1.   putAll fails with null pointer, and it doesnt not seem possible to create an empty valueMap.  Any ideas for another option? I have tried posting the full info on why we are doing this, but the forum system always deletes it, so trying this short version.

 

predicate.put("path", path); predicate.put("type", "cq:unstructured"); predicate.put("group.1_property", "sling:resourceType"); predicate.put("group.1_property.value", "mysite/components/gamemain"); predicate.put("group.2_property", "sling:resourceType"); predicate.put("group.2_property.value", "mysite/components/gameterms"); predicate.put("group.p.or", "true"); Query query = _builder.createQuery(PredicateGroup.create(predicate), session); // should only be 2 components! query.setStart(0); query.setHitsPerPage(20); SearchResult searchResult = query.getResult(); ValueMap allProps = null; for(Hit hit : searchResult.getHits()) { ValueMap props = hit.getProperties(); if (allProps == null) { allProps = props; } else { allProps.putAll(props); // null pointer exception } }

 

 

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Best answer by Vijayalakshmi_S

Hi @tb3dock,

Ways to instantiate an empty ValueMap is through its implementing Decorator classes. 

Map<String, Object> map = new HashMap<String, Object>();
ValueMap vm = new ValueMapDecorator(map);

Example :

 

Map<String, Object> map = new HashMap<String, Object>(); ValueMap vm = new ValueMapDecorator(map); /* Within Query results iteration */ for (Hit hit : queryResults.getHits()) { try { String pagePath = hit.getPath(); vm.putAll(hit.getProperties()); ....

 

Below API doc has the list of all known implementing classes of ValueMap, you can choose the one based on your need. (Ignore Deprecated ones from the list)

https://sling.apache.org/apidocs/sling8/org/apache/sling/api/resource/ValueMap.html

2 replies

Vijayalakshmi_S
Vijayalakshmi_SAccepted solution
Level 10
April 26, 2021

Hi @tb3dock,

Ways to instantiate an empty ValueMap is through its implementing Decorator classes. 

Map<String, Object> map = new HashMap<String, Object>();
ValueMap vm = new ValueMapDecorator(map);

Example :

 

Map<String, Object> map = new HashMap<String, Object>(); ValueMap vm = new ValueMapDecorator(map); /* Within Query results iteration */ for (Hit hit : queryResults.getHits()) { try { String pagePath = hit.getPath(); vm.putAll(hit.getProperties()); ....

 

Below API doc has the list of all known implementing classes of ValueMap, you can choose the one based on your need. (Ignore Deprecated ones from the list)

https://sling.apache.org/apidocs/sling8/org/apache/sling/api/resource/ValueMap.html

    Anudeep_Garnepudi
    Community Advisor
    Anudeep_GarnepudiCommunity Advisor
    Community Advisor
    April 27, 2021

    @tb3dock 

    You will get NullPointerException if any one of variables is null. 

    allProps.putAll(props);

    allProps and props should not be null. Please check.

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