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/*
* Copyright 2009-2021 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.ibatis.mapping;
import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Locale;
import java.util.Set;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.builder.BuilderException;
import org.apache.ibatis.logging.Log;
import org.apache.ibatis.logging.LogFactory;
import org.apache.ibatis.reflection.ParamNameUtil;
import org.apache.ibatis.session.Configuration;
/**
* @author Clinton Begin
*/
public class ResultMap {
private Configuration configuration;
private String id;
private Class type;
private List resultMappings;
private List idResultMappings;
private List constructorResultMappings;
private List propertyResultMappings;
private Set mappedColumns;
private Set mappedProperties;
private Discriminator discriminator;
private boolean hasNestedResultMaps;
private boolean hasNestedQueries;
private Boolean autoMapping;
private ResultMap() {
}
public static class Builder {
private static final Log log = LogFactory.getLog(Builder.class);
private ResultMap resultMap = new ResultMap();
public Builder(Configuration configuration, String id, Class type, List resultMappings) {
this(configuration, id, type, resultMappings, null);
}
public Builder(Configuration configuration, String id, Class type, List resultMappings, Boolean autoMapping) {
resultMap.configuration = configuration;
resultMap.id = id;
resultMap.type = type;
resultMap.resultMappings = resultMappings;
resultMap.autoMapping = autoMapping;
}
public Builder discriminator(Discriminator discriminator) {
resultMap.discriminator = discriminator;
return this;
}
public Class type() {
return resultMap.type;
}
public ResultMap build() {
if (resultMap.id == null) {
throw new IllegalArgumentException("ResultMaps must have an id");
}
resultMap.mappedColumns = new HashSet<>();
resultMap.mappedProperties = new HashSet<>();
resultMap.idResultMappings = new ArrayList<>();
resultMap.constructorResultMappings = new ArrayList<>();
resultMap.propertyResultMappings = new ArrayList<>();
final List constructorArgNames = new ArrayList<>();
for (ResultMapping resultMapping : resultMap.resultMappings) {
resultMap.hasNestedQueries = resultMap.hasNestedQueries || resultMapping.getNestedQueryId() != null;
resultMap.hasNestedResultMaps = resultMap.hasNestedResultMaps || (resultMapping.getNestedResultMapId() != null && resultMapping.getResultSet() == null);
final String column = resultMapping.getColumn();
if (column != null) {
resultMap.mappedColumns.add(column.toUpperCase(Locale.ENGLISH));
} else if (resultMapping.isCompositeResult()) {
for (ResultMapping compositeResultMapping : resultMapping.getComposites()) {
final String compositeColumn = compositeResultMapping.getColumn();
if (compositeColumn != null) {
resultMap.mappedColumns.add(compositeColumn.toUpperCase(Locale.ENGLISH));
}
}
}
final String property = resultMapping.getProperty();
if (property != null) {
resultMap.mappedProperties.add(property);
}
if (resultMapping.getFlags().contains(ResultFlag.CONSTRUCTOR)) {
resultMap.constructorResultMappings.add(resultMapping);
if (resultMapping.getProperty() != null) {
constructorArgNames.add(resultMapping.getProperty());
}
} else {
resultMap.propertyResultMappings.add(resultMapping);
}
if (resultMapping.getFlags().contains(ResultFlag.ID)) {
resultMap.idResultMappings.add(resultMapping);
}
}
if (resultMap.idResultMappings.isEmpty()) {
resultMap.idResultMappings.addAll(resultMap.resultMappings);
}
if (!constructorArgNames.isEmpty()) {
final List actualArgNames = argNamesOfMatchingConstructor(constructorArgNames);
if (actualArgNames == null) {
throw new BuilderException("Error in result map '" + resultMap.id
+ "'. Failed to find a constructor in '"
+ resultMap.getType().getName() + "' by arg names " + constructorArgNames
+ ". There might be more info in debug log.");
}
resultMap.constructorResultMappings.sort((o1, o2) -> {
int paramIdx1 = actualArgNames.indexOf(o1.getProperty());
int paramIdx2 = actualArgNames.indexOf(o2.getProperty());
return paramIdx1 - paramIdx2;
});
}
// lock down collections
resultMap.resultMappings = Collections.unmodifiableList(resultMap.resultMappings);
resultMap.idResultMappings = Collections.unmodifiableList(resultMap.idResultMappings);
resultMap.constructorResultMappings = Collections.unmodifiableList(resultMap.constructorResultMappings);
resultMap.propertyResultMappings = Collections.unmodifiableList(resultMap.propertyResultMappings);
resultMap.mappedColumns = Collections.unmodifiableSet(resultMap.mappedColumns);
return resultMap;
}
private List argNamesOfMatchingConstructor(List constructorArgNames) {
Constructor[] constructors = resultMap.type.getDeclaredConstructors();
for (Constructor constructor : constructors) {
Class[] paramTypes = constructor.getParameterTypes();
if (constructorArgNames.size() == paramTypes.length) {
List paramNames = getArgNames(constructor);
if (constructorArgNames.containsAll(paramNames)
&& argTypesMatch(constructorArgNames, paramTypes, paramNames)) {
return paramNames;
}
}
}
return null;
}
private boolean argTypesMatch(final List constructorArgNames,
Class[] paramTypes, List paramNames) {
for (int i = 0; i < constructorArgNames.size(); i++) {
Class actualType = paramTypes[paramNames.indexOf(constructorArgNames.get(i))];
Class specifiedType = resultMap.constructorResultMappings.get(i).getJavaType();
if (!actualType.equals(specifiedType)) {
if (log.isDebugEnabled()) {
log.debug("While building result map '" + resultMap.id
+ "', found a constructor with arg names " + constructorArgNames
+ ", but the type of '" + constructorArgNames.get(i)
+ "' did not match. Specified: [" + specifiedType.getName() + "] Declared: ["
+ actualType.getName() + "]");
}
return false;
}
}
return true;
}
private List getArgNames(Constructor constructor) {
List paramNames = new ArrayList<>();
List actualParamNames = null;
final Annotation[][] paramAnnotations = constructor.getParameterAnnotations();
int paramCount = paramAnnotations.length;
for (int paramIndex = 0; paramIndex < paramCount; paramIndex++) {
String name = null;
for (Annotation annotation : paramAnnotations[paramIndex]) {
if (annotation instanceof Param) {
name = ((Param) annotation).value();
break;
}
}
if (name == null && resultMap.configuration.isUseActualParamName()) {
if (actualParamNames == null) {
actualParamNames = ParamNameUtil.getParamNames(constructor);
}
if (actualParamNames.size() > paramIndex) {
name = actualParamNames.get(paramIndex);
}
}
paramNames.add(name != null ? name : "arg" + paramIndex);
}
return paramNames;
}
}
public String getId() {
return id;
}
public boolean hasNestedResultMaps() {
return hasNestedResultMaps;
}
public boolean hasNestedQueries() {
return hasNestedQueries;
}
public Class getType() {
return type;
}
public List getResultMappings() {
return resultMappings;
}
public List getConstructorResultMappings() {
return constructorResultMappings;
}
public List getPropertyResultMappings() {
return propertyResultMappings;
}
public List getIdResultMappings() {
return idResultMappings;
}
public Set getMappedColumns() {
return mappedColumns;
}
public Set getMappedProperties() {
return mappedProperties;
}
public Discriminator getDiscriminator() {
return discriminator;
}
public void forceNestedResultMaps() {
hasNestedResultMaps = true;
}
public Boolean getAutoMapping() {
return autoMapping;
}
}