/*
* 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.deltaspike.data.impl.builder.part;
import static org.apache.deltaspike.data.impl.util.QueryUtils.splitByKeyword;
import java.util.HashSet;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.apache.deltaspike.data.impl.builder.MethodExpressionException;
import org.apache.deltaspike.data.impl.builder.QueryBuilder;
import org.apache.deltaspike.data.impl.builder.QueryBuilderContext;
import org.apache.deltaspike.data.impl.meta.RepositoryComponent;
/**
* Root of the query tree. Also the only exposed class in the package.
*/
public class QueryRoot extends QueryPart
{
public static final QueryRoot UNKNOWN_ROOT = new QueryRoot("null-object", "");
private static final Logger log = Logger.getLogger(QueryRoot.class.getName());
private final String entityName;
private final String queryPrefix;
private String jpqlQuery;
protected QueryRoot(String entityName, String queryPrefix)
{
this.entityName = entityName;
this.queryPrefix = queryPrefix;
}
public static QueryRoot create(String method, RepositoryComponent repo)
{
QueryRoot root = new QueryRoot(repo.getEntityName(), repo.getMethodPrefix());
root.build(method, method, repo);
root.createJpql();
return root;
}
public String getJpqlQuery()
{
return jpqlQuery;
}
@Override
protected QueryPart build(String queryPart, String method, RepositoryComponent repo)
{
String[] orderByParts = splitByKeyword(queryPart, "OrderBy");
if (hasQueryConditions(orderByParts))
{
String[] orParts = splitByKeyword(removePrefix(orderByParts[0]), "Or");
boolean first = true;
for (String or : orParts)
{
OrQueryPart orPart = new OrQueryPart(first);
first = false;
children.add(orPart.build(or, method, repo));
}
}
if (orderByParts.length > 1)
{
OrderByQueryPart orderByPart = new OrderByQueryPart();
children.add(orderByPart.build(orderByParts[1], method, repo));
}
if (children.isEmpty())
{
throw new MethodExpressionException(repo.getRepositoryClass(), method);
}
return this;
}
@Override
protected QueryPart buildQuery(QueryBuilderContext ctx)
{
ctx.append(QueryBuilder.selectQuery(entityName));
if (hasChildren(excludedForWhereCheck()))
{
ctx.append(" where ");
}
buildQueryForChildren(ctx);
return this;
}
protected String createJpql()
{
QueryBuilderContext ctx = new QueryBuilderContext();
buildQuery(ctx);
jpqlQuery = ctx.resultString();
log.log(Level.FINER, "createJpql: Query is {0}", jpqlQuery);
return jpqlQuery;
}
private Set<Class<? extends QueryPart>> excludedForWhereCheck()
{
Set<Class<? extends QueryPart>> excluded = new HashSet<Class<? extends QueryPart>>();
excluded.add(OrderByQueryPart.class);
return excluded;
}
private boolean hasQueryConditions(String[] orderByParts)
{
return !queryPrefix.equals(orderByParts[0]);
}
private String removePrefix(String queryPart)
{
if (queryPart.startsWith(queryPrefix))
{
return queryPart.substring(queryPrefix.length());
}
return queryPart;
}
}