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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.openjpa.persistence.query;
import java.sql.Time;
import java.sql.Timestamp;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Calendar;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;
import org.apache.openjpa.lib.util.Localizer;
/**
* Implements QueryDefinition.
*
* @author Pinaki Poddar
*
*/
public class QueryDefinitionImpl extends ExpressionImpl
implements QueryDefinition, Expression {
private final QueryBuilderImpl _builder;
private List _domains;
private List _groupBys;
private List _orderBys;
private List _projections;
private boolean _distinct;
private Predicate _where;
private Predicate _having;
private static enum Visit {PROJECTION, EXPRESSION, JOINABLE};
protected static Localizer _loc =
Localizer.forPackage(QueryDefinitionImpl.class);
/**
*
* @param builder
*/
protected QueryDefinitionImpl(QueryBuilderImpl builder) {
_builder = builder;
}
/**
* Root domain object has no parent, no path but a non-null Class.
*/
public DomainObject addRoot(Class cls) {
RootPath root = new RootPath(this, cls);
addDomain(root);
return root;
}
public DomainObject addSubqueryRoot(PathExpression path) {
AbstractPath impl = (AbstractPath)path;
LinkedList paths = impl.split();
QueryDefinitionImpl owner = impl.getOwner();
int i = 0;
while (i < paths.size() && owner.hasDomain(paths.get(i))) {
i++;
}
AbstractPath next = paths.get(i);
DomainObject newRoot = new NavigationPath(this,
next.getParent(), next.getLastSegment().toString());
addDomain((AbstractDomainObject)newRoot);
i++;
for (; i < paths.size(); i++) {
next = paths.get(i);
newRoot = newRoot.join(next.getLastSegment().toString());
}
return newRoot;
}
boolean hasDomain(PathExpression path) {
return _domains != null && _domains.contains(path);
}
protected T addDomain(T path) {
if (_domains == null)
_domains = new ArrayList();
_domains.add(path);
return path;
}
public Subquery all() {
return new AllExpression(this);
}
public Subquery any() {
return new AnyExpression(this);
}
public Expression coalesce(Expression... exp) {
throw new UnsupportedOperationException();
}
public Expression coalesce(String... exp) {
throw new UnsupportedOperationException();
}
public Expression coalesce(Date... exp) {
throw new UnsupportedOperationException();
}
public Expression coalesce(Calendar... exp) {
throw new UnsupportedOperationException();
}
public Expression currentDate() {
return new CurrentTimeExpression(Date.class);
}
public Expression currentTime() {
return new CurrentTimeExpression(Time.class);
}
public Expression currentTimestamp() {
return new CurrentTimeExpression(Timestamp.class);
}
public Predicate exists() {
return new ExistsExpression(this);
}
public CaseExpression generalCase() {
return new CaseExpressionImpl();
}
public QueryDefinition groupBy(PathExpression... pathExprs) {
if (_groupBys == null) {
_groupBys = new ArrayList();
} else {
_groupBys.clear();
}
for (PathExpression e : pathExprs)
_groupBys.add(e);
return this;
}
public QueryDefinition groupBy(List pathExprList) {
if (_groupBys == null) {
_groupBys = new ArrayList();
} else {
_groupBys.clear();
}
for (PathExpression e : pathExprList)
_groupBys.add(e);
return this;
}
public QueryDefinition having(Predicate predicate) {
_having = predicate;
return this;
}
public Expression literal(String s) {
return new LiteralExpression(s);
}
public Expression literal(Number n) {
return new LiteralExpression(n);
}
public Expression literal(boolean b) {
return new LiteralExpression(b);
}
public Expression literal(Calendar c) {
return new LiteralExpression(c);
}
public Expression literal(Date d) {
return new LiteralExpression(d);
}
public Expression literal(char c) {
return new LiteralExpression(c);
}
public Expression literal(Class cls) {
return new LiteralExpression(cls);
}
public Expression literal(Enum e) {
return new LiteralExpression(e);
}
public Expression nullLiteral() {
return new LiteralExpression(null);
}
public SelectItem newInstance(Class cls, SelectItem... args) {
return new NewInstance(cls, args);
}
public Expression nullif(Expression exp1, Expression exp2) {
throw new UnsupportedOperationException();
}
public Expression nullif(Number arg1, Number arg2) {
throw new UnsupportedOperationException();
}
public Expression nullif(String arg1, String arg2) {
throw new UnsupportedOperationException();
}
public Expression nullif(Date arg1, Date arg2) {
throw new UnsupportedOperationException();
}
public Expression nullif(Calendar arg1, Calendar arg2) {
throw new UnsupportedOperationException();
}
public Expression nullif(Class arg1, Class arg2) {
throw new UnsupportedOperationException();
}
public Expression nullif(Enum arg1, Enum arg2) {
throw new UnsupportedOperationException();
}
public QueryDefinition orderBy(OrderByItem... orderByItems) {
if (_orderBys == null)
_orderBys = new ArrayList();
else
_orderBys.clear();
for (OrderByItem i : orderByItems) {
if (i instanceof OrderableItem)
_orderBys.add((OrderableItem)i);
else
_orderBys.add(new OrderableItem((ExpressionImpl)i));
}
return this;
}
public QueryDefinition orderBy(List orderByItemList) {
if (_orderBys == null)
_orderBys = new ArrayList();
else
_orderBys.clear();
for (OrderByItem i : orderByItemList) {
if (i instanceof OrderableItem)
_orderBys.add((OrderableItem)i);
else
_orderBys.add(new OrderableItem((ExpressionImpl)i, null));
}
return this;
}
public Expression param(String name) {
return new ParameterExpression(name);
}
public Predicate predicate(boolean b) {
return null;
}
public QueryDefinition select(SelectItem... items) {
return select(items == null ? null : Arrays.asList(items), false);
}
public QueryDefinition select(List items) {
return select(items, false);
}
public QueryDefinition selectDistinct(SelectItem... items) {
return select(items == null ? null : Arrays.asList(items), true);
}
public QueryDefinition selectDistinct(List items) {
return select(items, true);
}
private QueryDefinition select(List items, boolean isDistinct) {
if (_projections == null) {
_projections = new ArrayList();
} else {
_projections.clear();
}
_distinct = isDistinct;
for (SelectItem item : items)
_projections.add(item);
return this;
}
public CaseExpression simpleCase(Expression caseOperand) {
return new CaseExpressionImpl(caseOperand);
}
public CaseExpression simpleCase(Number caseOperand) {
return new CaseExpressionImpl(caseOperand);
}
public CaseExpression simpleCase(String caseOperand) {
return new CaseExpressionImpl(caseOperand);
}
public CaseExpression simpleCase(Date caseOperand) {
return new CaseExpressionImpl(caseOperand);
}
public CaseExpression simpleCase(Calendar caseOperand) {
return new CaseExpressionImpl(caseOperand);
}
public CaseExpression simpleCase(Class caseOperand) {
return new CaseExpressionImpl(caseOperand);
}
public CaseExpression simpleCase(Enum caseOperand) {
return new CaseExpressionImpl(caseOperand);
}
public Subquery some() {
return new SomeExpression(this);
}
public QueryDefinition where(Predicate predicate) {
_where = predicate;
return this;
}
private List getProjections() {
if (_projections == null) {
List defaultProjection = new ArrayList();
defaultProjection.add(_domains.get(0));
return defaultProjection;
}
return _projections;
}
@Override
public String asExpression(AliasContext ctx) {
ctx.push(this);
StringBuilder buffer = new StringBuilder();
registerDomains(ctx);
String select = _distinct ? "SELECT DISTINCT " : "SELECT ";
fillBuffer(select, buffer, ctx, getProjections(), Visit.PROJECTION);
fillBuffer(" FROM ", buffer, ctx, _domains, Visit.JOINABLE);
fillBuffer(" WHERE ", buffer, ctx, _where);
fillBuffer(" GROUP BY ", buffer, ctx, _groupBys, Visit.EXPRESSION);
fillBuffer(" HAVING ", buffer, ctx, _having);
fillBuffer(" ORDER BY ", buffer, ctx, _orderBys, Visit.EXPRESSION);
return buffer.toString();
}
public String asProjection(AliasContext ctx) {
return asExpression(ctx);
}
public void fillBuffer(String header, StringBuilder buffer, AliasContext ctx,
List list, Visit visit) {
if (list == null || list.isEmpty())
return;
buffer.append(header);
for (int i = 0; i < list.size(); i++) {
Visitable v = (Visitable)list.get(i);
switch(visit) {
case PROJECTION : buffer.append(v.asProjection(ctx))
.append(i != list.size()-1 ? ", " : " ");
break;
case EXPRESSION : buffer.append(v.asExpression(ctx))
.append(i != list.size()-1 ? ", " : " ");
break;
case JOINABLE : buffer.append(i > 0 && v instanceof RootPath ?
", " : " ").append(v.asJoinable(ctx));
break;
}
}
}
public void fillBuffer(String header, StringBuilder buffer, AliasContext ctx,
Predicate p) {
if (p == null)
return;
Visitable v = (Visitable)p;
buffer.append(header);
buffer.append(v.asExpression(ctx));
}
/**
* Registers each domain with an alias. Also set alias for order by items
* that are projected.
*/
private void registerDomains(AliasContext ctx) {
if (_domains != null) {
Collections.sort(_domains, new DomainSorter());
for (AbstractDomainObject domain : _domains) {
ctx.setAlias(domain);
}
}
if (_orderBys != null) {
for (OrderableItem o : _orderBys) {
ExpressionImpl e = o.getExpression();
if (_projections != null && _projections.contains(e))
ctx.setAlias(e);
}
}
}
static class DomainSorter implements Comparator {
static List _order = Arrays.asList(new Class[] {
RootPath.class, NavigationPath.class, OperatorPath.class,
JoinPath.class, FetchPath.class, } );
public int compare(AbstractDomainObject a, AbstractDomainObject b) {
return _order.indexOf(a.getClass()) - _order.indexOf(b.getClass());
}
}
}
