io.ebeaninternal.server.dto.DtoMeta Maven / Gradle / Ivy
package io.ebeaninternal.server.dto;
import java.util.*;
/**
* Holds property and constructor meta-data for a given DTO bean type.
*
* Uses this to map a mapping request (columns) to a 'query plan' (constructor and setters).
*/
final class DtoMeta {
private final Class dtoType;
private final Map propMap = new LinkedHashMap<>();
private final Map constructorMap = new LinkedHashMap<>();
private final DtoMetaConstructor defaultConstructor;
private final DtoMetaConstructor maxArgConstructor;
DtoMeta(Class dtoType, Collection constructors, List properties) {
this.dtoType = dtoType;
for (DtoMetaProperty property : properties) {
propMap.put(property.name().toUpperCase(), property);
}
int maxArg = 0;
DtoMetaConstructor defaultConstructor = null;
DtoMetaConstructor maxArgConstructor = null;
for (DtoMetaConstructor constructor : constructors) {
int args = constructor.argCount();
constructorMap.put(args, constructor);
if (args == 0) {
defaultConstructor = constructor;
} else if (args > maxArg) {
maxArgConstructor = constructor;
maxArg = args;
}
}
this.defaultConstructor = defaultConstructor;
this.maxArgConstructor = maxArgConstructor;
}
public DtoQueryPlan match(DtoMappingRequest request) {
DtoColumn[] cols = request.columnMeta();
int colLen = cols.length;
DtoMetaConstructor constructor = constructorMap.get(colLen);
if (constructor != null) {
return new DtoQueryPlanConstructor(request, constructor);
}
if (maxArgConstructor != null && colLen > maxArgConstructor.argCount()) {
// maxArgConst + setters
return matchMaxArgPlusSetters(request);
}
if (defaultConstructor != null) {
return matchSetters(request);
}
String msg = "Unable to map the resultSet columns " + Arrays.toString(cols)
+ " to the bean type ["+dtoType+"] as the number of columns in the resultSet is less than the constructor"
+ " (and that there is no default constructor) ?";
throw new IllegalStateException(msg);
}
private DtoQueryPlanConPlus matchMaxArgPlusSetters(DtoMappingRequest request) {
DtoReadSet[] setterProps = request.mapArgPlusSetters(this, maxArgConstructor.argCount());
return new DtoQueryPlanConPlus(request, maxArgConstructor, setterProps);
}
private DtoQueryPlan matchSetters(DtoMappingRequest request) {
DtoReadSet[] setterProps = request.mapSetters(this);
return new DtoQueryPlanConSetter(request, defaultConstructor, setterProps);
}
DtoReadSet findProperty(String label) {
String upperLabel = label.toUpperCase();
DtoMetaProperty property = propMap.get(upperLabel);
if (property == null && upperLabel.startsWith("IS_")) {
property = propMap.get(upperLabel.substring(3));
}
if (property == null) {
property = propMap.get(upperLabel.replace("_", ""));
}
return property;
}
Class dtoType() {
return dtoType;
}
}