org.simpleflatmapper.map.mapper.UnorderedJoinMapperEnumerable Maven / Gradle / Ivy
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Java library to map flat record - ResultSet, csv - to java object with minimum configuration and low footprint.
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package org.simpleflatmapper.map.mapper;
import org.simpleflatmapper.map.MappingContext;
import org.simpleflatmapper.map.SourceFieldMapper;
import org.simpleflatmapper.map.context.impl.BreakDetector;
import org.simpleflatmapper.map.context.impl.BreakDetectorMappingContext;
import org.simpleflatmapper.util.ArrayListEnumerable;
import org.simpleflatmapper.util.Enumerable;
import org.simpleflatmapper.util.ErrorHelper;
import java.util.ArrayList;
public class UnorderedJoinMapperEnumerable implements Enumerable {
private final SourceFieldMapper mapper;
private final MappingContext mappingContext;
private final Enumerable sourceEnumerable;
private final BreakDetector breakDetector;
private Enumerable objectsEnumerable;
public UnorderedJoinMapperEnumerable(SourceFieldMapper mapper,
MappingContext mappingContext,
Enumerable sourceEnumerable) {
this.mapper = mapper;
this.mappingContext = mappingContext;
this.sourceEnumerable = sourceEnumerable;
this.breakDetector = getRootDetector(mappingContext);
}
private BreakDetector getRootDetector(MappingContext mappingContext) {
BreakDetectorMappingContext mp = (BreakDetectorMappingContext) mappingContext;
BreakDetector rootDetector = mp.getRootDetector();
if (!rootDetector.hasKeyDefinition()) {
throw new IllegalStateException("No key definitions");
}
return rootDetector;
}
@Override
public boolean next() {
try {
if (objectsEnumerable == null) objectsEnumerable = fetchAll();
return objectsEnumerable.next();
} catch (Exception e) {
ErrorHelper.rethrow(e);
return false;
}
}
private Enumerable fetchAll() throws Exception {
ArrayList objects = new ArrayList();
while (sourceEnumerable.next()) {
S source = sourceEnumerable.currentValue();
mappingContext.handleSource(source); // set current key
T currentValue = (T) breakDetector.getValue();
if (currentValue == null) {
currentValue = mapper.map(source, mappingContext);
breakDetector.setValue(currentValue);
objects.add(currentValue);
} else {
mapper.mapTo(source, currentValue, mappingContext);
}
}
return new ArrayListEnumerable(objects);
}
@Override
public T currentValue() {
return objectsEnumerable.currentValue();
}
@Override
public String toString() {
return "UnorderedJoinMapperEnumerable{" +
"jdbcMapper=" + mapper +
'}';
}
}