ResultMappingResolver类介绍
一个ResultMap元素对应一个ResultMap对象
resultMap元素中的idArg/result/association/collection元素对应一个ResultMapping对象,所有resultMap会有多个ResultMapping对象
association/collection元素对应一个内映射的ResultMap
不管是ResultMap对象还是内映射的ResultMap对象都被会加入到Configuration.resultMap属性
ration.resultMap属性
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一个ResultMap元素对应一个ResultMap对象
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resultMap元素中的idArg/result/association/collection元素对应一个ResultMapping对象,所有resultMap会有多个ResultMapping对象
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association/collection元素对应一个内映射的ResultMap
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不管是ResultMap对象还是内映射的ResultMap对象都被会加入到Configuration.resultMap属性
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ResultMappingResolver类分析
public class ResultMapResolver {
private final MapperBuilderAssistant assistant;
private final String id;
private final Class<?> type;
private final String extend;
private final Discriminator discriminator;
private final List<ResultMapping> resultMappings;
private final Boolean autoMapping;
public ResultMap resolve() {
return assistant.addResultMap(this.id, this.type, this.extend, this.discriminator, this.resultMappings, this.autoMapping);
}
}
public class MapperBuilderAssistant extends BaseBuilder {
...
public ResultMap addResultMap(String id,Class<?> type,String extend,Discriminator discriminator,List<ResultMapping> resultMappings,
Boolean autoMapping) {
id = applyCurrentNamespace(id, false);
extend = applyCurrentNamespace(extend, true);
if (extend != null) {
if (!configuration.hasResultMap(extend)) {
throw new IncompleteElementException("Could not find a parent resultmap with id '" + extend + "'");
}
ResultMap resultMap = configuration.getResultMap(extend);
List<ResultMapping> extendedResultMappings = new ArrayList<ResultMapping>(resultMap.getResultMappings());
extendedResultMappings.removeAll(resultMappings);
// Remove parent constructor if this resultMap declares a constructor.
boolean declaresConstructor = false;
for (ResultMapping resultMapping : resultMappings) {
if (resultMapping.getFlags().contains(ResultFlag.CONSTRUCTOR)) {
declaresConstructor = true;
break;
}
}
if (declaresConstructor) {
Iterator<ResultMapping> extendedResultMappingsIter = extendedResultMappings.iterator();
while (extendedResultMappingsIter.hasNext()) {
if (extendedResultMappingsIter.next().getFlags().contains(ResultFlag.CONSTRUCTOR)) {
extendedResultMappingsIter.remove();
}
}
}
resultMappings.addAll(extendedResultMappings);
}
// 交由ResultMap.Builder来创建ResultMap对象
ResultMap resultMap =
new ResultMap.Builder(configuration, id, type, resultMappings, autoMapping).discriminator(discriminator).build();
// 将ResultMap加载在Configuration中
configuration.addResultMap(resultMap);
return resultMap;
}
}x
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public class ResultMapResolver {2
private final MapperBuilderAssistant assistant;
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private final String id;
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private final Class<?> type;
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private final String extend;
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private final Discriminator discriminator;
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private final List<ResultMapping> resultMappings;
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private final Boolean autoMapping;
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public ResultMap resolve() {11
return assistant.addResultMap(this.id, this.type, this.extend, this.discriminator, this.resultMappings, this.autoMapping);
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}
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}
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public class MapperBuilderAssistant extends BaseBuilder {17
...
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public ResultMap addResultMap(String id,Class<?> type,String extend,Discriminator discriminator,List<ResultMapping> resultMappings,
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Boolean autoMapping) {20
id = applyCurrentNamespace(id, false);
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extend = applyCurrentNamespace(extend, true);
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if (extend != null) {23
if (!configuration.hasResultMap(extend)) {24
throw new IncompleteElementException("Could not find a parent resultmap with id '" + extend + "'");25
}
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ResultMap resultMap = configuration.getResultMap(extend);
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List<ResultMapping> extendedResultMappings = new ArrayList<ResultMapping>(resultMap.getResultMappings());
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extendedResultMappings.removeAll(resultMappings);
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// Remove parent constructor if this resultMap declares a constructor.
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boolean declaresConstructor = false;
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for (ResultMapping resultMapping : resultMappings) {32
if (resultMapping.getFlags().contains(ResultFlag.CONSTRUCTOR)) {33
declaresConstructor = true;
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break;
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}
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}
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if (declaresConstructor) {38
Iterator<ResultMapping> extendedResultMappingsIter = extendedResultMappings.iterator();
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while (extendedResultMappingsIter.hasNext()) {40
if (extendedResultMappingsIter.next().getFlags().contains(ResultFlag.CONSTRUCTOR)) {41
extendedResultMappingsIter.remove();
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}
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}
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}
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resultMappings.addAll(extendedResultMappings);
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}
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// 交由ResultMap.Builder来创建ResultMap对象
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ResultMap resultMap =
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new ResultMap.Builder(configuration, id, type, resultMappings, autoMapping).discriminator(discriminator).build();
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// 将ResultMap加载在Configuration中
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configuration.addResultMap(resultMap);
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return resultMap;
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}
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}