com.abubusoft.kripton.android.sqlite.internals.MigrationSQLChecker Maven / Gradle / Ivy
/*******************************************************************************
* Copyright 2015, 2017 Francesco Benincasa ([email protected]).
*
* 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 com.abubusoft.kripton.android.sqlite.internals;
import org.antlr.v4.runtime.CharStreams;
import org.antlr.v4.runtime.CommonTokenStream;
import org.antlr.v4.runtime.ParserRuleContext;
import org.antlr.v4.runtime.RecognitionException;
import org.antlr.v4.runtime.Recognizer;
import org.antlr.v4.runtime.tree.ParseTreeWalker;
import com.abubusoft.kripton.android.sqlite.KriptonAssert;
import com.abubusoft.kripton.common.Pair;
import com.abubusoft.kripton.processor.sqlite.grammars.jsql.JqlBaseListener;
import com.abubusoft.kripton.processor.sqlite.grammars.jsql.JqlLexer;
import com.abubusoft.kripton.processor.sqlite.grammars.jsql.JqlParser;
/**
* The Class MigrationSQLChecker.
*/
public class MigrationSQLChecker {
/** The instance. */
protected static MigrationSQLChecker instance;
/**
* Gets the single instance of MigrationSQLChecker.
*
* @return single instance of MigrationSQLChecker
*/
public static final MigrationSQLChecker getInstance() {
if (instance == null) {
instance = new MigrationSQLChecker();
}
return instance;
}
/** The walker. */
ParseTreeWalker walker = new ParseTreeWalker();
/**
* Instantiates a new migration SQL checker.
*/
private MigrationSQLChecker() {
}
/**
* Analyze internal.
*
* @param the generic type
* @param jql the jql
* @param listener the listener
*/
protected void analyzeInternal(final String jql, L listener) {
walker.walk(listener, prepareParser(jql).value0);
}
/**
* Analyze.
*
* @param the generic type
* @param sql the sql
* @param listener the listener
*/
public void analyze(final String sql, L listener) {
analyzeInternal(sql, listener);
}
/**
* Prepare parser.
*
* @param jql the jql
* @return the pair
*/
protected Pair prepareParser(final String jql) {
JqlLexer lexer = new JqlLexer(CharStreams.fromString(jql));
CommonTokenStream tokens = new CommonTokenStream(lexer);
JqlParser parser = new JqlParser(tokens);
parser.removeErrorListeners();
parser.addErrorListener(new JQLBaseErrorListener() {
@Override
public void syntaxError(Recognizer recognizer, Object offendingSymbol, int line,
int charPositionInLine, String msg, RecognitionException e) {
KriptonAssert.assertTrue(false, "unespected char at pos %s of SQL '%s'", charPositionInLine, jql);
}
});
ParserRuleContext context = parser.parse();
return new Pair<>(context, tokens);
}
}