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The MyBatis SQL mapper framework makes it easier to use a relational database with object-oriented applications. MyBatis couples objects with stored procedures or SQL statements using a XML descriptor or annotations. Simplicity is the biggest advantage of the MyBatis data mapper over object relational mapping tools.

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/**
 *    Copyright 2009-2020 the original author or authors.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */
package org.hzh.mybatis.analyzer;

import java.util.Set;

import org.antlr.v4.runtime.Token;
import org.antlr.v4.runtime.TokenStream;
import org.antlr.v4.runtime.tree.ParseTree;
import org.antlr.v4.runtime.tree.ParseTreeWalker;
import org.hzh.mybatis.listener.ParamListener;
import org.hzh.mybatis.listener.ParamListener.ParamInfo;
import org.hzh.mybatis.listener.SqlProcessorListener;
import org.hzh.mybatis.parser.MySqlLexer;
import org.hzh.mybatis.parser.MySqlParser;
import org.hzh.mybatis.utils.DebugUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ParseResult {
	private static final Logger logger = LoggerFactory.getLogger(ParseResult.class);

	String originalSql;
	ParseTree tree;
	TokenStream tokens;
	MySqlParser parser;
	// to do: add dynamic property for performance

	// parameter appear in sql
	private Set sqlParamInfos;

	public MySqlParser getParser() {
		return parser;
	}

	public ParseTree getTree() {
		return tree;
	}

	public Set getSqlParamInfos() {
		if (sqlParamInfos == null) {
			synchronized (this) {
				if (sqlParamInfos == null) {
					ParamListener listener = new ParamListener();
					ParseTreeWalker walker = new ParseTreeWalker();
					walker.walk(listener, tree);

					sqlParamInfos = listener.getParamInfos();
				}
			}
		}

		return sqlParamInfos;
	}

	// select,delete,update,insert
	public String getFirstText() {
		for (int i = 0; i < tokens.size(); i++) {
			Token token=tokens.get(i);
			if (token.getType() != MySqlLexer.SPACE) {
				return token.getText();
			}
		}
		throw new RuntimeException();
	}

	public ApplyParamResult apply(Object param) {
//		TokenStreamRewriter rewriter = new TokenStreamRewriter(tokens);
		SqlProcessorListener listener = new SqlProcessorListener(tokens, param);
		ParseTreeWalker walker = new ParseTreeWalker();
		walker.walk(listener, tree);

		String executaleSql = listener.getText();
		ApplyParamResult applyParamResult = new ApplyParamResult();
		applyParamResult.executaleSql = executaleSql;
		applyParamResult.paramList = listener.getParamList();
		logger.debug(applyParamResult.toString());

		assert executaleSql.indexOf('#') == -1
				&& DebugUtils.countForChar(executaleSql, '?') == listener.getParamList().size();

		return applyParamResult;
	}
}