package com.ctp.cdi.query.builder.part;
import static com.ctp.cdi.query.util.QueryUtils.splitByKeyword;
import java.util.HashSet;
import java.util.Set;
import org.jboss.solder.logging.Logger;
import com.ctp.cdi.query.builder.MethodExpressionException;
import com.ctp.cdi.query.builder.QueryBuilder;
import com.ctp.cdi.query.builder.QueryBuilderContext;
import com.ctp.cdi.query.meta.DaoComponent;
/**
* Root of the query tree. Also the only exposed class in the package.
* @author thomashug
*/
public class QueryRoot extends QueryPart {
public static final QueryRoot UNKNOWN_ROOT = new QueryRoot("null-object");
public static final String QUERY_PREFIX = "findBy";
private final Logger log = Logger.getLogger(QueryRoot.class);
private final String entityName;
private String jpqlQuery;
protected QueryRoot(String entityName) {
this.entityName = entityName;
}
public static QueryRoot create(String method, DaoComponent dao) {
QueryRoot root = new QueryRoot(dao.getEntityName());
root.build(method, method, dao);
root.createJpql();
return root;
}
public String getJpqlQuery() {
return jpqlQuery;
}
@Override
protected QueryPart build(String queryPart, String method, DaoComponent dao) {
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, dao));
}
}
if (orderByParts.length > 1) {
OrderByQueryPart orderByPart = new OrderByQueryPart();
children.add(orderByPart.build(orderByParts[1], method, dao));
}
if (children.isEmpty()) {
throw new MethodExpressionException(dao.getDaoClass(), 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.debugv("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 !QUERY_PREFIX.equals(orderByParts[0]);
}
private String removePrefix(String queryPart) {
if (queryPart.startsWith(QUERY_PREFIX)) {
return queryPart.substring(QUERY_PREFIX.length());
}
return queryPart;
}
}