Added missing classes needed for JOINs.

source/java/com/whitemagicsoftware/rxm/tree/xml/JoinMapContext.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 org.antlr.v4.runtime.ParserRuleContext;
		+
		+/**
		+ * Superclass for common behaviour between INNER and OUTER JOIN clauses.
		+ */
		+public abstract class JoinMapContext extends PayloadParserRuleContext {
		+ /**
		+ * Default constructor (calls super).
		+ *
		+ * @param initPayload The payload that associates the parser rule context
		+ * with the abstract syntax tree.
		+ */
		+ public JoinMapContext( Payload initPayload ) {
		+ super( initPayload);
		+ }
		+
		+ public abstract String getJoinType();
		+
		+ /**
		+ * Returns the starting text for an OUTER JOIN clause.
		+ */
		+ @Override
		+ public Token getStart() {
		+ ParserRuleContext ctx = getParserRuleContext();
		+
		+
		+
		+ return new Token( String.format( "%s JOIN %s", getJoinType(), ctx.getText() ) );
		+ }
		+
		+ /**
		+ * Returns the ending text for an OUTER JOIN clause.
		+ */
		+ @Override
		+ public Token getStop() {
		+ return new Token( "" );
		+ }
		+}
		+

source/java/com/whitemagicsoftware/rxm/tree/xml/OuterMapContext.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 <b><code>table.column -> table.column</code></b> into a SQL
		+ * <code>OUTER JOIN</code> expression.
		+ */
		+public class OuterMapContext extends JoinMapContext {
		+ /**
		+ * Default constructor (calls super).
		+ *
		+ * @param ctx The payload that associates the parser rule context with
		+ * the abstract syntax tree.
		+ */
		+ public OuterMapContext( Payload ctx ) {
		+ super( ctx );
		+ }
		+
		+ public String getJoinType() {
		+ return "OUTER";
		+ }
		+}
		+

Delta	74 lines added, 0 lines removed, 74-line increase