Files for parsing the rxm WHERE expression.

Delta	77 lines added, 0 lines removed, 77-line increase

source/java/com/whitemagicsoftware/rxm/tree/xml/WhereClauseList.java

		+package com.whitemagicsoftware.rxm.tree.xml;
		+
		+import com.whitemagicsoftware.rxm.tree.Payload;
		+
		+import org.antlr.v4.runtime.Token;
		+
		+/**
		+ * <p>
		+ * Stores a list of Payload instances. This is instantiated by the parser
		+ * to create a transformation list capable of generating SQL/XML WHERE
		+ * expressions. The payload dynamically determines the set of wrapper classes
		+ * using the package for name of class.
		+ * </p>
		+ * <p>
		+ * The tree is being re-used as a list. (A list is simply a tree with
		+ * one branch and many siblings.)
		+ * </p>
		+ */
		+public class WhereClauseList<T extends Payload> extends JoinClauseList<T> {
		+ /**
		+ * Constructs a list capable of transforming itself into a SQL/XML
		+ * FROM clause.
		+ *
		+ * @param payload The data associated with this list (must not be null).
		+ */
		+ public WhereClauseList( T payload ) {
		+ super( payload );
		+ }
		+}
		+

source/java/com/whitemagicsoftware/rxm/tree/xml/WhereContext.java

		+package com.whitemagicsoftware.rxm.tree.xml;
		+
		+import com.whitemagicsoftware.rxm.grammar.QueryParser;
		+import com.whitemagicsoftware.rxm.tree.Payload;
		+import com.whitemagicsoftware.rxm.tree.Token;
		+import com.whitemagicsoftware.rxm.tree.Tree;
		+
		+import org.antlr.v4.runtime.ParserRuleContext;
		+
		+/**
		+ * Transforms a where <b>rxm</b> expression into a SQL <code>WHERE</code>
		+ * expression.
		+ */
		+public class WhereContext extends PayloadParserRuleContext {
		+ /**
		+ * Default constructor (calls super).
		+ *
		+ * @param ctx The payload that associates the parser rule context with
		+ * the abstract syntax tree.
		+ */
		+ public WhereContext( Payload ctx ) {
		+ super( ctx );
		+ }
		+
		+ /**
		+ * Returns the starting text for an OUTER JOIN clause.
		+ */
		+ @Override
		+ public Token getStart() {
		+ QueryParser.ExpressionContext expression = expression();
		+
		+ return new Token( expression.getText() );
		+ }
		+
		+ /**
		+ * Returns the ending text for an OUTER JOIN clause.
		+ */
		+ @Override
		+ public Token getStop() {
		+ return new Token( "" );
		+ }
		+
		+ private QueryParser.ExpressionContext expression() {
		+ return ((QueryParser.WhereContext)getParserRuleContext()).expression();
		+ }
		+}
		+