com.tangosol.coherence.dslquery.token.SQLDeleteOPToken Maven / Gradle / Ivy
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/*
* Copyright (c) 2000, 2020, Oracle and/or its affiliates.
*
* Licensed under the Universal Permissive License v 1.0 as shown at
* http://oss.oracle.com/licenses/upl.
*/
package com.tangosol.coherence.dslquery.token;
import com.tangosol.coherence.dsltools.precedence.OPParser;
import com.tangosol.coherence.dsltools.precedence.OPScanner;
import com.tangosol.coherence.dsltools.precedence.OPToken;
import com.tangosol.coherence.dsltools.termtrees.AtomicTerm;
import com.tangosol.coherence.dsltools.termtrees.Term;
import com.tangosol.coherence.dsltools.termtrees.Terms;
/**
* SQLDeleteOPToken is used for parsing and specifying the AST
* used for a delete query.
*
* Syntax:
*
* DELETE FROM 'cache-name' [[AS] alias] [WHERE conditional-expression]
*
* @author djl 2009.09.10
*/
public class SQLDeleteOPToken
extends SQLOPToken
{
// ----- constructors ---------------------------------------------------
/**
* Construct a new SQLDeleteOPToken with the given parameters.
*
* @param id string identifier for this token
*/
public SQLDeleteOPToken(String id)
{
super(id, OPToken.IDENTIFIER_NODE);
}
// ----- Operator Precedence API ----------------------------------------
@Override
public Term nud(OPParser parser)
{
Term whereClause;
OPScanner s = parser.getScanner();
if (s.advanceWhenMatching("from"))
{
Term table = Terms.newTerm("from", AtomicTerm.createString(s.getCurrentAsStringWithAdvance()));
Term alias = checkAlias(parser, "where");
if (s.advanceWhenMatching("where"))
{
whereClause = Terms.newTerm("whereClause", parser.expression(0));
}
else
{
whereClause = Terms.newTerm("whereClause");
}
return Terms.newTerm(FUNCTOR, table, alias, whereClause);
}
else
{
return super.nud(parser);
}
}
// ----- constants ------------------------------------------------------
/**
* The functor name used to represent this node in an AST.
*/
public static final String FUNCTOR = "sqlDeleteNode";
}