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Bug 393073 - NPE in the hasNext method #5

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Bug 393073 - NPE in the hasNext method #5

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23cf0b1
Bug 393073 [WIP] - NPE in the hasNext method
berezovskyi Jul 19, 2017
c67876e
Merge branch 'master' into b393073-hasNext-NPE
berezovskyi Feb 15, 2019
952a583
Move test resources under the right dir
berezovskyi Feb 16, 2019
d7a09b8
Fix bad URis
berezovskyi Feb 16, 2019
d2026d9
Modify test and emit log warn
berezovskyi Feb 16, 2019
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103 changes: 40 additions & 63 deletions ....lyo.client.java/src/main/java/org/eclipse/lyo/client/oslc/resources/OslcQueryResult.java
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Original file line number Diff line number Diff line change
Expand Up @@ -53,7 +53,7 @@
public class OslcQueryResult implements Iterator<OslcQueryResult> {
/**
* The default member property to look for in OSLC query results
* (rdfs:member). Can be changed using {@link #setMemberProperty(Property)}.
* (rdfs:member). Can be changed using {@link #setMemberProperty(String)}.
*/
public final static Property DEFAULT_MEMBER_PROPERTY = RDFS.member;

Expand All @@ -73,14 +73,13 @@ private AnyMemberSelector(Resource subject) {
}

public boolean selects(Statement s) {
String fqPredicateName = s.getPredicate().getNameSpace() + s.getPredicate().getLocalName();
if (OSLCConstants.RDF_TYPE_PROP.equals(fqPredicateName)) {
return false;
}
String fqPredicateName = s.getPredicate().getNameSpace() + s.getPredicate()
.getLocalName();
return !OSLCConstants.RDF_TYPE_PROP.equals(fqPredicateName) && s.getObject()
.isResource();

return s.getObject().isResource();
}
}
}
}

private final OslcQuery query;

Expand All @@ -101,20 +100,15 @@ public boolean selects(Statement s) {
public OslcQueryResult(OslcQuery query, ClientResponse response) {
this.query = query;
this.response = response;

this.pageNumber = 1;


}

private OslcQueryResult(OslcQueryResult prev) {
this.query = new OslcQuery(prev);
this.query = prev.query;
this.response = this.query.getResponse();
this.membersResource = prev.membersResource;
this.memberProperty = prev.memberProperty;

this.pageNumber = prev.pageNumber + 1;

}

private synchronized void initializeRdf() {
Expand All @@ -128,11 +122,10 @@ private synchronized void initializeRdf() {
Property responseInfo = rdfModel.createProperty(OslcConstants.OSLC_CORE_NAMESPACE, "ResponseInfo");
ResIterator iter = rdfModel.listResourcesWithProperty(rdfType, responseInfo);

//There should only be one - take the first
infoResource = null;
while (iter.hasNext()) {
if (iter.hasNext()) {
// There should only be one - take the first
infoResource = iter.next();
break;
}
membersResource = rdfModel.getResource(query.getCapabilityUrl());
}
Expand All @@ -146,7 +139,8 @@ String getNextPageUrl() {
StmtIterator iter = rdfModel.listStatements(select);
if (iter.hasNext()) {
Statement nextPage = iter.next();
nextPageUrl = nextPage.getResource().getURI();
final Resource nextPageResource = nextPage.getResource();
nextPageUrl = nextPageResource.getURI();
} else {
nextPageUrl = "";
}
Expand All @@ -158,12 +152,13 @@ String getNextPageUrl() {
* @return whether there is another page of results after this
*/
public boolean hasNext() {
return (!"".equals(getNextPageUrl()));
final String nextPageUrl = getNextPageUrl();
final boolean nextUrlNotEmpty = nextPageUrl != null && nextPageUrl.trim().length() > 0;
return nextUrlNotEmpty;
}

/**
* @return the next page of results
* @throws NoSuchElementException if there is no next page
*/
public OslcQueryResult next() {
return new OslcQueryResult(this);
Expand Down Expand Up @@ -234,7 +229,7 @@ private Selector getMemberSelector() {
*/
public String[] getMembersUrls() {
initializeRdf();
ArrayList<String> membersUrls = new ArrayList<String>();
ArrayList<String> membersUrls = new ArrayList<>();
Selector select = getMemberSelector();
StmtIterator iter = rdfModel.listStatements(select);
while (iter.hasNext()) {
Expand All @@ -247,7 +242,6 @@ public String[] getMembersUrls() {
/**
* Return the enumeration of queried results from this page
*
* @param T
* @param clazz
*
* @return member statements from current page.
Expand All @@ -257,47 +251,30 @@ public <T> Iterable<T> getMembers(final Class<T> clazz) {

Selector select = getMemberSelector();
final StmtIterator iter = rdfModel.listStatements(select);
Iterable<T> result = new Iterable<T>() {
public Iterator<T>
iterator() {
return new Iterator<T>() {
public boolean hasNext() {
return iter.hasNext();
}

@SuppressWarnings("unchecked")
public T next() {
Statement member = iter.next();

try {
return (T)JenaModelHelper.fromJenaResource((Resource)member.getObject(), clazz);
} catch (IllegalArgumentException e) {
throw new IllegalStateException(e.getMessage());
} catch (SecurityException e) {
throw new IllegalStateException(e.getMessage());
} catch (DatatypeConfigurationException e) {
throw new IllegalStateException(e.getMessage());
} catch (IllegalAccessException e) {
throw new IllegalStateException(e.getMessage());
} catch (InstantiationException e) {
throw new IllegalStateException(e.getMessage());
} catch (InvocationTargetException e) {
throw new IllegalStateException(e.getMessage());
} catch (OslcCoreApplicationException e) {
throw new IllegalStateException(e.getMessage());
} catch (URISyntaxException e) {
throw new IllegalStateException(e.getMessage());
} catch (NoSuchMethodException e) {
throw new IllegalStateException(e.getMessage());
}
}

public void remove() {
iter.remove();
}
};
}
};
Iterable<T> result = () -> new Iterator<T>() {
public boolean hasNext() {
return iter.hasNext();
}

@SuppressWarnings("unchecked")
public T next() {
Statement member = iter.next();

try {
return (T) JenaModelHelper.fromJenaResource((Resource) member.getObject(),
clazz);
} catch (IllegalArgumentException | SecurityException | IllegalAccessException |
DatatypeConfigurationException | InvocationTargetException |
InstantiationException | URISyntaxException | OslcCoreApplicationException
| NoSuchMethodException e) {
throw new IllegalStateException(e.getMessage());
}
}

public void remove() {
iter.remove();
}
};

return result;
}
Expand Down
26 changes: 25 additions & 1 deletion ...clipse.lyo.client.java/src/test/java/org/eclipse/lyo/client/test/OslcQueryResultTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,7 @@
*******************************************************************************/
package org.eclipse.lyo.client.test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.*;
import static org.mockito.Mockito.when;

import java.io.InputStream;
Expand Down Expand Up @@ -72,6 +72,30 @@ public void testQuery() {
assertEquals(2, result.getMembersUrls().length);
}

@Test
public void testQueryResultHasNext() {
ClientResponse mockedResponse = mockClientResponse("/queryResponseWithNext.xml");

OslcQueryParameters params = new OslcQueryParameters();
params.setWhere("ex:product=\"Product A\"");
OslcQuery query = new OslcQuery(new OslcClient(), "http://example.com/provider/query",
params);
OslcQueryResult result = new OslcQueryResult(query, mockedResponse);
assertTrue("Next URI resource should be detected", result.hasNext());
}

@Test
public void testQueryResultWithEmptyNext() {
ClientResponse mockedResponse = mockClientResponse("/queryResponseWithEmptyNext.xml");

OslcQueryParameters params = new OslcQueryParameters();
params.setWhere("ex:product=\"Product A\"");
OslcQuery query = new OslcQuery(new OslcClient(), "http://example.com/provider/query",
params);
OslcQueryResult result = new OslcQueryResult(query, mockedResponse);
assertFalse("Empty Next URI resource should be ignored", result.hasNext());
}

@Test
public void testBlogQuery() {
ClientResponse mockedResponse = mockClientResponse("/blogQuery.rdf");
Expand Down
12 changes: 12 additions & 0 deletions org.eclipse.lyo.client.java/src/test/resources/queryResponseWithEmptyNext.xml
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Original file line number Diff line number Diff line change
@@ -0,0 +1,12 @@
<?xml version="1.0" encoding="UTF-8"?>
<rdf:RDF xmlns:oslc="http://open-services.net/ns/core#" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#">
<oslc:ResponseInfo rdf:about="http://example.com/provider/query?oslc.where=ex%3Aproduct%3D%22Product%20A%2">
<oslc:totalCount rdf:datatype="http://www.w3.org/2001/XMLSchema#int">2</oslc:totalCount>
<oslc:nextPage rdf:resource="" />
</oslc:ResponseInfo>
<rdf:Description rdf:about="http://example.com/provider/query">
<rdfs:member rdf:resource="http://example.com/resources/1"/>
<rdfs:member rdf:resource="http://example.com/resources/3"/>
</rdf:Description>
</rdf:RDF>
13 changes: 13 additions & 0 deletions org.eclipse.lyo.client.java/src/test/resources/queryResponseWithNext.xml
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Original file line number Diff line number Diff line change
@@ -0,0 +1,13 @@
<?xml version="1.0" encoding="UTF-8"?>
<rdf:RDF xmlns:oslc="http://open-services.net/ns/core#" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#">
<oslc:ResponseInfo rdf:about="http://example.com/provider/query?oslc.where=ex%3Aproduct%3D%22Product%20A%2">
<oslc:totalCount rdf:datatype="http://www.w3.org/2001/XMLSchema#int">2</oslc:totalCount>
<oslc:nextPage rdf:resource="http://example.com/provider/query?oslc
.where=ex%3Aproduct%3D%22Product%20A%2&amp;page=2" />
</oslc:ResponseInfo>
<rdf:Description rdf:about="http://example.com/provider/query">
<rdfs:member rdf:resource="http://example.com/resources/1"/>
<rdfs:member rdf:resource="http://example.com/resources/3"/>
</rdf:Description>
</rdf:RDF>