org.mapstruct.ap.internal.gem.SubclassMappingGem Maven / Gradle / Ivy
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An annotation processor for generating type-safe bean mappers
package org.mapstruct.ap.internal.gem;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.lang.model.element.AnnotationMirror;
import javax.lang.model.element.AnnotationValue;
import javax.lang.model.element.Element;
import javax.lang.model.element.ElementKind;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.TypeElement;
import javax.lang.model.element.VariableElement;
import javax.lang.model.type.TypeMirror;
import javax.lang.model.util.AbstractAnnotationValueVisitor8;
import javax.lang.model.util.ElementFilter;
import org.mapstruct.tools.gem.Gem;
import org.mapstruct.tools.gem.GemValue;
import javax.lang.model.type.TypeMirror;
public class SubclassMappingGem implements Gem {
private final GemValue source;
private final GemValue target;
private final GemValue> qualifiedBy;
private final GemValue> qualifiedByName;
private final boolean isValid;
private final AnnotationMirror mirror;
private SubclassMappingGem( BuilderImpl builder ) {
this.source = builder.source;
this.target = builder.target;
this.qualifiedBy = builder.qualifiedBy;
this.qualifiedByName = builder.qualifiedByName;
isValid = ( this.source != null ? this.source.isValid() : false )
&& ( this.target != null ? this.target.isValid() : false )
&& ( this.qualifiedBy != null ? this.qualifiedBy.isValid() : false )
&& ( this.qualifiedByName != null ? this.qualifiedByName.isValid() : false );
mirror = builder.mirror;
}
/**
* accessor
*
* @return the {@link GemValue} for {@link SubclassMappingGem#source}
*/
public GemValue source( ) {
return source;
}
/**
* accessor
*
* @return the {@link GemValue} for {@link SubclassMappingGem#target}
*/
public GemValue target( ) {
return target;
}
/**
* accessor
*
* @return the {@link GemValue} for {@link SubclassMappingGem#qualifiedBy}
*/
public GemValue> qualifiedBy( ) {
return qualifiedBy;
}
/**
* accessor
*
* @return the {@link GemValue} for {@link SubclassMappingGem#qualifiedByName}
*/
public GemValue> qualifiedByName( ) {
return qualifiedByName;
}
@Override
public AnnotationMirror mirror( ) {
return mirror;
}
@Override
public boolean isValid( ) {
return isValid;
}
public static SubclassMappingGem instanceOn(Element element) {
return build( element, new BuilderImpl() );
}
public static SubclassMappingGem instanceOn(AnnotationMirror mirror ) {
return build( mirror, new BuilderImpl() );
}
public static T build(Element element, Builder builder) {
AnnotationMirror mirror = element.getAnnotationMirrors().stream()
.filter( a -> "org.mapstruct.SubclassMapping".contentEquals( ( ( TypeElement )a.getAnnotationType().asElement() ).getQualifiedName() ) )
.findAny()
.orElse( null );
return build( mirror, builder );
}
public static T build(AnnotationMirror mirror, Builder builder ) {
// return fast
if ( mirror == null || builder == null ) {
return null;
}
// fetch defaults from all defined values in the annotation type
List enclosed = ElementFilter.methodsIn( mirror.getAnnotationType().asElement().getEnclosedElements() );
Map defaultValues = new HashMap<>( enclosed.size() );
enclosed.forEach( e -> defaultValues.put( e.getSimpleName().toString(), e.getDefaultValue() ) );
// fetch all explicitely set annotation values in the annotation instance
Map values = new HashMap<>( enclosed.size() );
mirror.getElementValues().entrySet().forEach( e -> values.put( e.getKey().getSimpleName().toString(), e.getValue() ) );
// iterate and populate builder
for ( String methodName : defaultValues.keySet() ) {
if ( "source".equals( methodName ) ) {
builder.setSource( GemValue.create( values.get( methodName ), defaultValues.get( methodName ), TypeMirror.class ) );
}
else if ( "target".equals( methodName ) ) {
builder.setTarget( GemValue.create( values.get( methodName ), defaultValues.get( methodName ), TypeMirror.class ) );
}
else if ( "qualifiedBy".equals( methodName ) ) {
builder.setQualifiedby( GemValue.createArray( values.get( methodName ), defaultValues.get( methodName ), TypeMirror.class ) );
}
else if ( "qualifiedByName".equals( methodName ) ) {
builder.setQualifiedbyname( GemValue.createArray( values.get( methodName ), defaultValues.get( methodName ), String.class ) );
}
}
builder.setMirror( mirror );
return builder.build();
}
/**
* A builder that can be implemented by the user to define custom logic e.g. in the
* build method, prior to creating the annotation gem.
*/
public interface Builder {
/**
* Sets the {@link GemValue} for {@link SubclassMappingGem#source}
*
* @return the {@link Builder} for this gem, representing {@link SubclassMappingGem}
*/
Builder setSource(GemValue methodName );
/**
* Sets the {@link GemValue} for {@link SubclassMappingGem#target}
*
* @return the {@link Builder} for this gem, representing {@link SubclassMappingGem}
*/
Builder setTarget(GemValue methodName );
/**
* Sets the {@link GemValue} for {@link SubclassMappingGem#qualifiedBy}
*
* @return the {@link Builder} for this gem, representing {@link SubclassMappingGem}
*/
Builder setQualifiedby(GemValue> methodName );
/**
* Sets the {@link GemValue} for {@link SubclassMappingGem#qualifiedByName}
*
* @return the {@link Builder} for this gem, representing {@link SubclassMappingGem}
*/
Builder setQualifiedbyname(GemValue> methodName );
/**
* Sets the annotation mirror
*
* @param mirror the mirror which this gem represents
*
* @return the {@link Builder} for this gem, representing {@link SubclassMappingGem}
*/
Builder setMirror( AnnotationMirror mirror );
/**
* The build method can be overriden in a custom custom implementation, which allows
* the user to define his own custom validation on the annotation.
*
* @return the representation of the annotation
*/
T build();
}
private static class BuilderImpl implements Builder {
private GemValue source;
private GemValue target;
private GemValue> qualifiedBy;
private GemValue> qualifiedByName;
private AnnotationMirror mirror;
public Builder setSource(GemValue source ) {
this.source = source;
return this;
}
public Builder setTarget(GemValue target ) {
this.target = target;
return this;
}
public Builder setQualifiedby(GemValue> qualifiedBy ) {
this.qualifiedBy = qualifiedBy;
return this;
}
public Builder setQualifiedbyname(GemValue> qualifiedByName ) {
this.qualifiedByName = qualifiedByName;
return this;
}
public Builder setMirror( AnnotationMirror mirror ) {
this.mirror = mirror;
return this;
}
public SubclassMappingGem build() {
return new SubclassMappingGem( this );
}
}
}