| | import com.whitemagicsoftware.rxm.grammar.QueryParser; |
| | |
| | -import com.whitemagicsoftware.rxm.tree.Payload; |
| | -import com.whitemagicsoftware.rxm.tree.Tree; |
| | -import com.whitemagicsoftware.rxm.tree.xml.SelectClauseTree; |
| | +import com.whitemagicsoftware.rxm.tree.xml.SelectClause; |
| | import com.whitemagicsoftware.rxm.tree.xml.JoinClause; |
| | import com.whitemagicsoftware.rxm.tree.xml.WhereClause; |
 |
| | /** Map for containing modules. */ |
| | private RXM rxm; |
| | - |
| | - /** Current context. */ |
| | - private Tree<Payload> selectClauseTree; |
| | |
| | + private SelectClause selectClause = new SelectClause(); |
| | private JoinClause joinClause = new JoinClause(); |
| | - |
| | private WhereClause whereClause = new WhereClause(); |
| | |
|
| | receiveEvents( this ); |
| | receiveEvents( getJoinClause() ); |
| | + receiveEvents( getSelectClause() ); |
| | notifyEvents( ctx ); |
| | } |
|
| | private void rescindEvents( ParseTreeListener listener ) { |
| | getProxyParseTreeListener().remove( listener ); |
| | - } |
| | - |
| | - /** |
| | - * Adds the root context node to the top-most part of the tree. This |
| | - * sets the context tree to the root context node. |
| | - * |
| | - * @param ctx The payload to transform. |
| | - */ |
| | - @Override |
| | - public synchronized void enterRoot( QueryParser.RootContext ctx ) { |
| | - setSelectClauseTree( createSelectClauseTree( ctx ) ); |
| | - } |
| | - |
| | - /** |
| | - * Invoked when parsing <b><code>table > path</code></b>. Adds a new |
| | - * leaf to the context tree, then changes the context tree to the newly |
| | - * added leaf. |
| | - * |
| | - * @param ctx The payload to transform. |
| | - */ |
| | - @Override |
| | - public synchronized void enterTableMap( QueryParser.TableMapContext ctx ) { |
| | - setSelectClauseTree( addLeaf( ctx ) ); |
| | - } |
| | - |
| | - /** |
| | - * Invoked when parsing <b><code>column > path</code></b>. Adds a new |
| | - * leaf to the context tree. |
| | - * |
| | - * @param ctx The payload to transform. |
| | - */ |
| | - @Override |
| | - public synchronized void enterColumnMap( QueryParser.ColumnMapContext ctx ) { |
| | - addLeaf( ctx ); |
| | - } |
| | - |
| | - /** |
| | - * Invoked when parsing <b><code>column > attribute</code></b>. Adds |
| | - * a new leaf to the context tree. |
| | - * |
| | - * @param ctx The payload to transform. |
| | - */ |
| | - @Override |
| | - public synchronized void enterAttributeMap( |
| | - QueryParser.AttributeMapContext ctx ) { |
| | - addLeaf( ctx ); |
| | } |
| | - |
| | - /** |
| | - * Invoked when parsing <b><code>^</code></b>. Changes context tree to |
| | - * its parent. If the parent doesn't exist, this will fail silently. |
| | - * |
| | - * @param ctx Indicates that context should switch, has no payload. |
| | - */ |
| | - @Override |
| | - public synchronized void enterPop( QueryParser.PopContext ctx ) { |
| | - Tree<Payload> parent = getSelectClauseTree().getParent(); |
| | |
| | - if( parent != null ) { |
| | - setSelectClauseTree( parent ); |
| | - } |
| | - } |
| | - |
| | /** |
| | * The where clause begins after all the statements. The where clause |
|
| | receiveEvents( getWhereClause() ); |
| | rescindEvents( getJoinClause() ); |
| | + rescindEvents( getSelectClause() ); |
| | } |
| | |
| | /** |
| | * Invoked when there are no more <b>rxm</b> tokens to parse. |
| | * |
| | * @param ctx Indicates that the query has been parsed. |
| | */ |
| | @Override |
| | public void exitQuery( QueryParser.QueryContext ctx ) { |
| | - String select = getSelectClause(); |
| | + String select = getSelectClause().toString(); |
| | String from = getFromClause(); |
| | String join = getJoinClause().toString(); |
| | String where = getWhereClause().toString(); |
| | |
| | System.out.printf( "%s%s%s%s", select, from, join, where ); |
| | - } |
| | - |
| | - /** |
| | - * This should only be called after the SELECT clause has been |
| | - * constructed using the AST. |
| | - * |
| | - * @return The SELECT portion of a SQL statement. |
| | - */ |
| | - private String getSelectClause() { |
| | - return getSelectClauseTree().getRoot().toString(); |
| | } |
| | |
| | private String getFromClause() { |
| | - return ((SelectClauseTree<Payload>)getSelectClauseTree()).getFromClause(); |
| | + return getSelectClause().getFromClause(); |
| | } |
| | |
|
| | private WhereClause getWhereClause() { |
| | return this.whereClause; |
| | - } |
| | - |
| | - /** |
| | - * Adds the given parser rule context to the current context tree. |
| | - * |
| | - * @param ctx The parser rule context to add as a leaf to the context tree. |
| | - * @return The leaf (tree) that was added. |
| | - */ |
| | - private Tree<Payload> addLeaf( ParserRuleContext ctx ) { |
| | - return getSelectClauseTree().addLeaf( createSelectClauseTree( ctx ) ); |
| | } |
| | |
|
| | private RXM getRXM() { |
| | return this.rxm; |
| | - } |
| | - |
| | - /** |
| | - * Changes where the next mapped items will be attached. |
| | - */ |
| | - private void setSelectClauseTree( Tree<Payload> selectClauseTree ) { |
| | - this.selectClauseTree = selectClauseTree; |
| | - } |
| | - |
| | - /** |
| | - * Returns where to attach upcoming map items. |
| | - */ |
| | - private Tree<Payload> getSelectClauseTree() { |
| | - return this.selectClauseTree; |
| | } |
| | - |
| | - /** |
| | - * Creates a new tree with the given parser rule context. This is required |
| | - * so that the *Context classes are aware of their relative position in the |
| | - * hierarchy. As a consequence of that knowledge, the objects have access |
| | - * to the nearest table name, whether siblings exist, etc. |
| | - * |
| | - * @param ctx The context to wrap in a payload that is added to a tree. |
| | - * |
| | - * @return The tree that contains the payload that wraps the context. |
| | - */ |
| | - private Tree<Payload> createSelectClauseTree( ParserRuleContext ctx ) { |
| | - Tree<Payload> tree = getSelectClauseTree(); |
| | - Payload payload = new Payload( ctx ); |
| | - SelectClauseTree<Payload> sct = new SelectClauseTree<Payload>( payload ); |
| | - |
| | - // Ensure that the first payload (root node) has a valid payload tree. |
| | - payload.setTree( tree == null ? sct : tree ); |
| | |
| | - return sct; |
| | + private SelectClause getSelectClause() { |
| | + return this.selectClause; |
| | } |
| | |