org.apache.metamodel.jdbc.dialects
Class DefaultQueryRewriter

java.lang.Object
  org.apache.metamodel.jdbc.dialects.AbstractQueryRewriter
      org.apache.metamodel.jdbc.dialects.DefaultQueryRewriter

All Implemented Interfaces:

IQueryRewriter

Direct Known Subclasses:

DB2QueryRewriter, HsqldbQueryRewriter, LimitOffsetQueryRewriter, SQLServerQueryRewriter

public class DefaultQueryRewriter
extends AbstractQueryRewriter

Generic query rewriter that adds syntax enhancements that are only possible to resolve just before execution time.

Field Summary

Fields inherited from class org.apache.metamodel.jdbc.dialects.AbstractQueryRewriter

logger

Constructor Summary

DefaultQueryRewriter(JdbcDataContext dataContext)

Method Summary

protected Query	beforeRewrite(Query query) Method to modify query before rewriting begins.
String	escapeQuotes(String item) Escapes the quotes within a String literal of a query item.
boolean	isFirstRowSupported() Gets whether this query rewriter is able to write the "First row" query property to the query string.
boolean	isMaxRowsSupported() Gets whether this query rewriter is able to write the "Max rows" query property to the query string.
String	rewriteFilterItem(FilterItem item)

Methods inherited from class org.apache.metamodel.jdbc.dialects.AbstractQueryRewriter

getColumnType, getDataContext, isSchemaIncludedInColumnPaths, rewriteColumnType, rewriteFromClause, rewriteFromItem, rewriteFromItem, rewriteGroupByClause, rewriteGroupByItem, rewriteHavingClause, rewriteOrderByClause, rewriteOrderByItem, rewriteQuery, rewriteSelectClause, rewriteSelectItem, rewriteWhereClause

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DefaultQueryRewriter

public DefaultQueryRewriter(JdbcDataContext dataContext)

Method Detail

beforeRewrite

protected Query beforeRewrite(Query query)

Description copied from class: AbstractQueryRewriter

Method to modify query before rewriting begins. Overwrite this method if you want to change parts of the query that are not just rendering related. Cloning the query before modifying is recommended in order to not violate referential integrity of clients (the query is mutable).

Overrides:

beforeRewrite in class AbstractQueryRewriter

Returns:

the modified query

rewriteFilterItem

public String rewriteFilterItem(FilterItem item)

Specified by:

rewriteFilterItem in interface IQueryRewriter

Overrides:

rewriteFilterItem in class AbstractQueryRewriter

isFirstRowSupported

public boolean isFirstRowSupported()

Description copied from interface: IQueryRewriter

Gets whether this query rewriter is able to write the "First row" query property to the query string.

Returns:

whether this query rewriter is able to write the "First row" query property to the query string.

isMaxRowsSupported

public boolean isMaxRowsSupported()

Description copied from interface: IQueryRewriter

Gets whether this query rewriter is able to write the "Max rows" query property to the query string.

Returns:

whether this query rewriter is able to write the "Max rows" query property to the query string.

escapeQuotes

public String escapeQuotes(String item)

Description copied from interface: IQueryRewriter

Escapes the quotes within a String literal of a query item.

Returns:

String item with quotes escaped.