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com.mysema.query.jpa.JPQLSerializer Maven / Gradle / Ivy
/*
* Copyright (c) 2010 Mysema Ltd.
* All rights reserved.
*
*/
package com.mysema.query.jpa;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Set;
import javax.annotation.Nullable;
import javax.persistence.DiscriminatorValue;
import javax.persistence.Entity;
import javax.persistence.EnumType;
import javax.persistence.Enumerated;
import com.mysema.query.JoinExpression;
import com.mysema.query.JoinType;
import com.mysema.query.QueryMetadata;
import com.mysema.query.support.SerializerBase;
import com.mysema.query.types.*;
import com.mysema.util.MathUtils;
/**
* JPQLSerializer serializes Querydsl expressions into JPQL syntax.
*
* @author tiwe
*/
public class JPQLSerializer extends SerializerBase {
private static final Set> NUMERIC = new HashSet>(Arrays.>asList(
Ops.ADD, Ops.SUB, Ops.MULT, Ops.DIV,
Ops.LT, Ops.LOE, Ops.GT, Ops.GOE, Ops.BETWEEN,
Ops.BEFORE, Ops.AFTER, Ops.BOE, Ops.AOE));
private static final String COMMA = ", ";
private static final String DELETE = "delete from ";
private static final String FROM = "from ";
private static final String GROUP_BY = "\ngroup by ";
private static final String HAVING = "\nhaving ";
private static final String ORDER_BY = "\norder by ";
private static final String SELECT = "select ";
private static final String SELECT_COUNT = "select count(";
private static final String SELECT_COUNT_DISTINCT = "select count(distinct ";
private static final String SELECT_DISTINCT = "select distinct ";
private static final String SET = "\nset ";
private static final String UPDATE = "update ";
private static final String WHERE = "\nwhere ";
private static final String WITH = " with ";
private static final Map joinTypes = new HashMap();
private final JPQLTemplates templates;
private boolean inProjection = false;
static{
joinTypes.put(JoinType.DEFAULT, COMMA);
joinTypes.put(JoinType.FULLJOIN, "\n full join ");
joinTypes.put(JoinType.INNERJOIN, "\n inner join ");
joinTypes.put(JoinType.JOIN, "\n join ");
joinTypes.put(JoinType.LEFTJOIN, "\n left join ");
}
private boolean wrapElements = false;
public JPQLSerializer(JPQLTemplates templates) {
super(templates);
this.templates = templates;
}
private void handleJoinTarget(JoinExpression je) {
// type specifier
if (je.getTarget() instanceof EntityPath) {
EntityPath pe = (EntityPath) je.getTarget();
if (pe.getMetadata().getParent() == null) {
Entity entityAnnotation = pe.getAnnotatedElement().getAnnotation(Entity.class);
if (entityAnnotation != null && entityAnnotation.name().length() > 0){
append(entityAnnotation.name());
} else if (pe.getType().getPackage() != null) {
String pn = pe.getType().getPackage().getName();
String typeName = pe.getType().getName().substring(pn.length() + 1);
append(typeName);
} else {
append(pe.getType().getName());
}
append(" ");
}
}
handle(je.getTarget());
}
public void serialize(QueryMetadata metadata, boolean forCountRow, @Nullable String projection) {
List> select = metadata.getProjection();
List joins = metadata.getJoins();
Predicate where = metadata.getWhere();
List> groupBy = metadata.getGroupBy();
Predicate having = metadata.getHaving();
List> orderBy = metadata.getOrderBy();
// select
boolean inProjectionOrig = inProjection;
inProjection = true;
if (projection != null){
append(SELECT).append(projection).append("\n");
}else if (forCountRow) {
if (!metadata.isDistinct()){
append(SELECT_COUNT);
}else{
append(SELECT_COUNT_DISTINCT);
}
if(!select.isEmpty()){
handle(COMMA, select);
}else{
handle(joins.get(0).getTarget());
}
append(")\n");
} else if (!select.isEmpty()) {
if (!metadata.isDistinct()) {
append(SELECT);
} else {
append(SELECT_DISTINCT);
}
handle(COMMA, select).append("\n");
}
inProjection = inProjectionOrig;
// from
append(FROM);
serializeSources(forCountRow, joins);
// where
if (where != null) {
append(WHERE).handle(where);
}
// group by
if (!groupBy.isEmpty()) {
append(GROUP_BY).handle(COMMA, groupBy);
}
// having
if (having != null) {
append(HAVING).handle(having);
}
// order by
if (!orderBy.isEmpty() && !forCountRow) {
append(ORDER_BY);
boolean first = true;
for (OrderSpecifier os : orderBy) {
if (!first){
append(COMMA);
}
handle(os.getTarget());
append(" " + os.getOrder().toString().toLowerCase(Locale.ENGLISH));
first = false;
}
}
}
public void serializeForDelete(QueryMetadata md) {
append(DELETE);
handleJoinTarget(md.getJoins().get(0));
if (md.getWhere() != null) {
append(WHERE).handle(md.getWhere());
}
}
public void serializeForUpdate(QueryMetadata md) {
append(UPDATE);
handleJoinTarget(md.getJoins().get(0));
append(SET);
handle(COMMA, md.getProjection());
if (md.getWhere() != null) {
append(WHERE).handle(md.getWhere());
}
}
private void serializeSources(boolean forCountRow, List joins) {
for (int i = 0; i < joins.size(); i++) {
JoinExpression je = joins.get(i);
if (i > 0) {
append(joinTypes.get(je.getType()));
}
if (je.hasFlag(JPQLQueryMixin.FETCH) && !forCountRow){
handle(JPQLQueryMixin.FETCH);
}
handleJoinTarget(je);
if (je.hasFlag(JPQLQueryMixin.FETCH_ALL_PROPERTIES) && !forCountRow){
handle(JPQLQueryMixin.FETCH_ALL_PROPERTIES);
}
if (je.getCondition() != null) {
append(WITH).handle(je.getCondition());
}
}
}
@Override
public Void visit(Constant expr, Void context) {
boolean wrap = templates.wrapConstant(expr);
if (wrap) {
append("(");
}
append(":");
if (!getConstantToLabel().containsKey(expr.getConstant())) {
String constLabel = getConstantPrefix() + (getConstantToLabel().size()+1);
getConstantToLabel().put(expr.getConstant(), constLabel);
append(constLabel);
} else {
append(getConstantToLabel().get(expr.getConstant()));
}
if (wrap) {
append(")");
}
return null;
}
@Override
public Void visit(ParamExpression param, Void context){
append(":");
super.visit(param, context);
return null;
}
@Override
public Void visit(SubQueryExpression query, Void context) {
append("(");
serialize(query.getMetadata(), false, null);
append(")");
return null;
}
@Override
public Void visit(Path expr, Void context){
// only wrap a PathCollection, if it the pathType is PROPERTY
boolean wrap = wrapElements
&& (Collection.class.isAssignableFrom(expr.getType()) || Map.class.isAssignableFrom(expr.getType()))
&& expr.getMetadata().getPathType().equals(PathType.PROPERTY);
if (wrap) {
append("elements(");
}
super.visit(expr, context);
if (wrap) {
append(")");
}
return null;
}
@Override
public Void visit(FactoryExpression expr, Void context) {
if (!inProjection) {
append("(");
super.visit(expr, context);
append(")");
} else {
super.visit(expr, context);
}
return null;
}
@Override
@SuppressWarnings("unchecked")
protected void visitOperation(Class type, Operator operator, List> args) {
boolean old = wrapElements;
wrapElements = templates.wrapElements(operator);
if (operator.equals(Ops.IN)){
if (args.get(1) instanceof Path){
if (!templates.isEnumInPathSupported() && args.get(0) instanceof Constant && Enum.class.isAssignableFrom(args.get(0).getType())) {
Enumerated enumerated = ((Path)args.get(1)).getAnnotatedElement().getAnnotation(Enumerated.class);
Enum constant = (Enum)((Constant)args.get(0)).getConstant();
if (enumerated == null || enumerated.value() == EnumType.ORDINAL) {
args = Arrays.asList(new ConstantImpl(constant.ordinal()), args.get(1));
} else {
args = Arrays.asList(new ConstantImpl(constant.name()), args.get(1));
}
}
super.visitOperation(type, JPQLTemplates.MEMBER_OF, args);
}else{
super.visitOperation(type, operator, args);
}
} else if (operator.equals(Ops.INSTANCE_OF)) {
if (templates.isTypeAsString()){
List> newArgs = new ArrayList>(args);
Class cl = ((Class) ((Constant) newArgs.get(1)).getConstant());
// use discriminator value instead of fqnm
if (cl.getAnnotation(DiscriminatorValue.class) != null){
newArgs.set(1, ConstantImpl.create(cl.getAnnotation(DiscriminatorValue.class).value()));
}else{
newArgs.set(1, ConstantImpl.create(cl.getName()));
}
super.visitOperation(type, operator, newArgs);
}else{
super.visitOperation(type, operator, args);
}
} else if (operator.equals(Ops.NUMCAST)) {
Class targetType = (Class) ((Constant) args.get(1)).getConstant();
String typeName = targetType.getSimpleName().toLowerCase(Locale.ENGLISH);
visitOperation(targetType, JPQLTemplates.CAST, Arrays.>asList(args.get(0), ConstantImpl.create(typeName)));
} else if (operator.equals(Ops.EXISTS) && args.get(0) instanceof SubQueryExpression){
SubQueryExpression subQuery = (SubQueryExpression) args.get(0);
append("exists (");
serialize(subQuery.getMetadata(), false, templates.getExistsProjection());
append(")");
} else if (operator.equals(Ops.MATCHES) || operator.equals(Ops.MATCHES_IC)){
super.visitOperation(type, Ops.LIKE,
Arrays.asList(args.get(0), ExpressionUtils.regexToLike((Expression) args.get(1))));
}else if(NUMERIC.contains(operator)){
super.visitOperation(type, operator, normalizeNumericArgs(args));
} else {
super.visitOperation(type, operator, args);
}
//
wrapElements = old;
}
@SuppressWarnings("unchecked")
private List> normalizeNumericArgs(List> args) {
boolean hasConstants = false;
Class numType = null;
for (Expression arg : args){
if (Number.class.isAssignableFrom(arg.getType())){
if (arg instanceof Constant){
hasConstants = true;
}else{
numType = (Class) arg.getType();
}
}
}
if (hasConstants && numType != null){
List> newArgs = new ArrayList>(args.size());
for (Expression arg : args){
if (arg instanceof Constant && Number.class.isAssignableFrom(arg.getType())
&& !arg.getType().equals(numType)){
Number number = (Number) ((Constant)arg).getConstant();
newArgs.add(new ConstantImpl(MathUtils.cast(number, (Class)numType)));
}else{
newArgs.add(arg);
}
}
return newArgs;
}else{
return args;
}
}
}
