org.eclipse.jnosql.diana.query.AbstractSupplier Maven / Gradle / Ivy

/*
 *  Copyright (c) 2018 Otávio Santana and others
 *  All rights reserved. This program and the accompanying materials
 *  are made available under the terms of the Eclipse Public License v1.0
 *  and Apache License v2.0 which accompanies this distribution.
 *  The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
 *  and the Apache License v2.0 is available at http://www.opensource.org/licenses/apache2.0.php.
 *  You may elect to redistribute this code under either of these licenses.
 *  Contributors:
 *  Otavio Santana
 */
package org.eclipse.jnosql.diana.query;

import org.antlr.v4.runtime.CharStream;
import org.antlr.v4.runtime.CharStreams;
import org.antlr.v4.runtime.CommonTokenStream;
import org.antlr.v4.runtime.tree.ParseTree;
import org.antlr.v4.runtime.tree.ParseTreeWalker;

import java.util.Objects;
import java.util.function.Function;

abstract class AbstractSupplier extends QueryBaseListener {

    abstract Function getParserTree();

    protected void runQuery(String query) {
        Objects.requireNonNull(query, "query is required");

        CharStream stream = CharStreams.fromString(query);
        QueryLexer lexer = new QueryLexer(stream);
        CommonTokenStream tokens = new CommonTokenStream(lexer);
        QueryParser parser = new QueryParser(tokens);
        lexer.removeErrorListeners();
        parser.removeErrorListeners();
        lexer.addErrorListener(QueryErrorListener.INSTANCE);
        parser.addErrorListener(QueryErrorListener.INSTANCE);

        ParseTree tree = getParserTree().apply(parser);
        ParseTreeWalker walker = new ParseTreeWalker();
        walker.walk(this, tree);
    }
}