org.mapstruct.ap.internal.model.ValueMappingMethod Maven / Gradle / Ivy
/*
* Copyright MapStruct Authors.
*
* Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
*/
package org.mapstruct.ap.internal.model;
import static org.mapstruct.ap.internal.util.Collections.first;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import javax.lang.model.type.TypeMirror;
import javax.lang.model.util.Types;
import org.mapstruct.ap.internal.model.common.Parameter;
import org.mapstruct.ap.internal.model.source.ForgedMethod;
import org.mapstruct.ap.internal.model.source.ForgedMethodHistory;
import org.mapstruct.ap.internal.model.source.Method;
import org.mapstruct.ap.internal.model.source.SelectionParameters;
import org.mapstruct.ap.internal.model.source.ValueMapping;
import org.mapstruct.ap.internal.prism.BeanMappingPrism;
import org.mapstruct.ap.internal.prism.MappingConstantsPrism;
import org.mapstruct.ap.internal.util.Message;
import org.mapstruct.ap.internal.util.Strings;
/**
* A {@link ValueMappingMethod} which maps one value type to another, optionally configured by one or more
* {@link ValueMapping}s. For now, only enum-to-enum mapping is supported.
*
* @author Sjaak Derksen
*/
public class ValueMappingMethod extends MappingMethod {
private final List valueMappings;
private final String defaultTarget;
private final String nullTarget;
private final boolean throwIllegalArgumentException;
private final boolean overridden;
public static class Builder {
private Method method;
private MappingBuilderContext ctx;
private final List trueValueMappings = new ArrayList<>();
private ValueMapping defaultTargetValue = null;
private ValueMapping nullTargetValue = null;
private boolean applyNamebasedMappings = true;
public Builder mappingContext(MappingBuilderContext mappingContext) {
this.ctx = mappingContext;
return this;
}
public Builder method(Method sourceMethod) {
this.method = sourceMethod;
return this;
}
public Builder valueMappings(List valueMappings) {
for ( ValueMapping valueMapping : valueMappings ) {
if ( MappingConstantsPrism.ANY_REMAINING.equals( valueMapping.getSource() ) ) {
defaultTargetValue = valueMapping;
}
else if ( MappingConstantsPrism.ANY_UNMAPPED.equals( valueMapping.getSource() ) ) {
defaultTargetValue = valueMapping;
applyNamebasedMappings = false;
}
else if ( MappingConstantsPrism.NULL.equals( valueMapping.getSource() ) ) {
nullTargetValue = valueMapping;
}
else {
trueValueMappings.add( valueMapping );
}
}
return this;
}
public ValueMappingMethod build( ) {
// initialize all relevant parameters
List mappingEntries = new ArrayList<>();
String nullTarget = null;
String defaultTarget = null;
boolean throwIllegalArgumentException = false;
// for now, we're only dealing with enum mappings, populate relevant parameters based on enum-2-enum
if ( first( method.getSourceParameters() ).getType().isEnumType() && method.getResultType().isEnumType() ) {
mappingEntries.addAll( enumToEnumMapping( method ) );
if ( (nullTargetValue != null) && !MappingConstantsPrism.NULL.equals( nullTargetValue.getTarget() ) ) {
// absense nulltargetvalue reverts to null. Or it could be a deliberate choice to return null
nullTarget = nullTargetValue.getTarget();
}
if ( defaultTargetValue != null ) {
// If the default target value is NULL then we should map it to null
defaultTarget = MappingConstantsPrism.NULL.equals( defaultTargetValue.getTarget() ) ? null :
defaultTargetValue.getTarget();
}
else {
throwIllegalArgumentException = true;
}
}
// do before / after lifecycle mappings
SelectionParameters selectionParameters = getSelectionParameters( method, ctx.getTypeUtils() );
Set existingVariables = new HashSet<>( method.getParameterNames() );
List beforeMappingMethods =
LifecycleMethodResolver.beforeMappingMethods( method, selectionParameters, ctx, existingVariables );
List afterMappingMethods =
LifecycleMethodResolver.afterMappingMethods( method, selectionParameters, ctx, existingVariables );
// finally return a mapping
return new ValueMappingMethod( method, mappingEntries, nullTarget, defaultTarget,
throwIllegalArgumentException, beforeMappingMethods, afterMappingMethods );
}
private List enumToEnumMapping(Method method) {
List mappings = new ArrayList<>();
List unmappedSourceConstants
= new ArrayList<>( first( method.getSourceParameters() ).getType().getEnumConstants() );
if ( !reportErrorIfMappedEnumConstantsDontExist( method ) ) {
return mappings;
}
// Start to fill the mappings with the defined valuemappings
for ( ValueMapping valueMapping : trueValueMappings ) {
String target =
MappingConstantsPrism.NULL.equals( valueMapping.getTarget() ) ? null : valueMapping.getTarget();
mappings.add( new MappingEntry( valueMapping.getSource(), target ) );
unmappedSourceConstants.remove( valueMapping.getSource() );
}
// add mappings based on name
if ( applyNamebasedMappings ) {
// get all target constants
List targetConstants = method.getReturnType().getEnumConstants();
for ( String sourceConstant : new ArrayList<>( unmappedSourceConstants ) ) {
if ( targetConstants.contains( sourceConstant ) ) {
mappings.add( new MappingEntry( sourceConstant, sourceConstant ) );
unmappedSourceConstants.remove( sourceConstant );
}
}
if ( defaultTargetValue == null && !unmappedSourceConstants.isEmpty() ) {
String sourceErrorMessage = "source";
String targetErrorMessage = "target";
if ( method instanceof ForgedMethod && ( (ForgedMethod) method ).getHistory() != null ) {
ForgedMethodHistory history = ( (ForgedMethod) method ).getHistory();
sourceErrorMessage = history.createSourcePropertyErrorMessage();
targetErrorMessage =
"\"" + history.getTargetType().toString() + " " + history.createTargetPropertyName() + "\"";
}
// all sources should now be matched, there's no default to fall back to, so if sources remain,
// we have an issue.
ctx.getMessager().printMessage( method.getExecutable(),
Message.VALUE_MAPPING_UNMAPPED_SOURCES,
sourceErrorMessage,
targetErrorMessage,
Strings.join( unmappedSourceConstants, ", " )
);
}
}
return mappings;
}
private SelectionParameters getSelectionParameters(Method method, Types typeUtils) {
BeanMappingPrism beanMappingPrism = BeanMappingPrism.getInstanceOn( method.getExecutable() );
if ( beanMappingPrism != null ) {
List qualifiers = beanMappingPrism.qualifiedBy();
List qualifyingNames = beanMappingPrism.qualifiedByName();
TypeMirror resultType = beanMappingPrism.resultType();
return new SelectionParameters( qualifiers, qualifyingNames, resultType, typeUtils );
}
return null;
}
private boolean reportErrorIfMappedEnumConstantsDontExist(Method method) {
List sourceEnumConstants = first( method.getSourceParameters() ).getType().getEnumConstants();
List targetEnumConstants = method.getReturnType().getEnumConstants();
boolean foundIncorrectMapping = false;
for ( ValueMapping mappedConstant : trueValueMappings ) {
if ( !sourceEnumConstants.contains( mappedConstant.getSource() ) ) {
ctx.getMessager().printMessage( method.getExecutable(),
mappedConstant.getMirror(),
mappedConstant.getSourceAnnotationValue(),
Message.VALUEMAPPING_NON_EXISTING_CONSTANT,
mappedConstant.getSource(),
first( method.getSourceParameters() ).getType()
);
foundIncorrectMapping = true;
}
if ( !MappingConstantsPrism.NULL.equals( mappedConstant.getTarget() )
&& !targetEnumConstants.contains( mappedConstant.getTarget() ) ) {
ctx.getMessager().printMessage( method.getExecutable(),
mappedConstant.getMirror(),
mappedConstant.getTargetAnnotationValue(),
Message.VALUEMAPPING_NON_EXISTING_CONSTANT,
mappedConstant.getTarget(),
method.getReturnType()
);
foundIncorrectMapping = true;
}
}
if ( defaultTargetValue != null && !MappingConstantsPrism.NULL.equals( defaultTargetValue.getTarget() )
&& !targetEnumConstants.contains( defaultTargetValue.getTarget() ) ) {
ctx.getMessager().printMessage( method.getExecutable(),
defaultTargetValue.getMirror(),
defaultTargetValue.getTargetAnnotationValue(),
Message.VALUEMAPPING_NON_EXISTING_CONSTANT,
defaultTargetValue.getTarget(),
method.getReturnType()
);
foundIncorrectMapping = true;
}
if ( nullTargetValue != null && MappingConstantsPrism.NULL.equals( nullTargetValue.getTarget() )
&& !targetEnumConstants.contains( nullTargetValue.getTarget() ) ) {
ctx.getMessager().printMessage( method.getExecutable(),
nullTargetValue.getMirror(),
nullTargetValue.getTargetAnnotationValue(),
Message.VALUEMAPPING_NON_EXISTING_CONSTANT,
nullTargetValue.getTarget(),
method.getReturnType()
);
foundIncorrectMapping = true;
}
return !foundIncorrectMapping;
}
}
private ValueMappingMethod(Method method, List enumMappings, String nullTarget, String defaultTarget,
boolean throwIllegalArgumentException, List beforeMappingMethods,
List afterMappingMethods) {
super( method, beforeMappingMethods, afterMappingMethods );
this.valueMappings = enumMappings;
this.nullTarget = nullTarget;
this.defaultTarget = defaultTarget;
this.throwIllegalArgumentException = throwIllegalArgumentException;
this.overridden = method.overridesMethod();
}
public List getValueMappings() {
return valueMappings;
}
public String getDefaultTarget() {
return defaultTarget;
}
public String getNullTarget() {
return nullTarget;
}
public boolean isThrowIllegalArgumentException() {
return throwIllegalArgumentException;
}
public Parameter getSourceParameter() {
return first( getSourceParameters() );
}
public boolean isOverridden() {
return overridden;
}
public static class MappingEntry {
private final String source;
private final String target;
MappingEntry( String source, String target ) {
this.source = source;
this.target = target;
}
public String getSource() {
return source;
}
public String getTarget() {
return target;
}
}
}
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