/* * 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.jdbi.v3.core.rewriter; import static org.jdbi.v3.core.internal.lexer.ColonStatementLexer.*; // SUPPRESS CHECKSTYLE WARNING import static org.jdbi.v3.core.rewriter.DefinedAttributeRewriter.rewriteDefines; import java.util.Collections; import java.util.Map; import java.util.WeakHashMap; import org.antlr.runtime.ANTLRStringStream; import org.antlr.runtime.Token; import org.jdbi.v3.core.statement.Binding; import org.jdbi.v3.core.statement.StatementContext; import org.jdbi.v3.core.statement.UnableToCreateStatementException; import org.jdbi.v3.core.internal.lexer.ColonStatementLexer; /** * Statement rewriter which replaces named parameter tokens of the form <code>:tokenName</code> * <p> * This is the default statement rewriter * </p> */ public class ColonPrefixStatementRewriter implements StatementRewriter { private final Map<String, ParsedStatement> cache = Collections.synchronizedMap(new WeakHashMap<>()); /** * Munge up the SQL as desired. Responsible for figuring out ow to bind any * arguments in to the resultant prepared statement. * * @param sql The SQL to rewrite * @param params contains the arguments which have been bound to this statement. * @param ctx The statement context for the statement being executed * @return something which can provide the actual SQL to prepare a statement from * and which can bind the correct arguments to that prepared statement */ @Override public RewrittenStatement rewrite(String sql, Binding params, StatementContext ctx) { try { ParsedStatement stmt = cache.computeIfAbsent(rewriteDefines(sql, ctx), this::rewriteNamedParameters); return new InternalRewrittenStatement(stmt, ctx); } catch (IllegalArgumentException e) { throw new UnableToCreateStatementException("Exception parsing for named parameter replacement", e, ctx); } } ParsedStatement rewriteNamedParameters(String sql) throws IllegalArgumentException { ParsedStatement stmt = new ParsedStatement(); StringBuilder b = new StringBuilder(sql.length()); ColonStatementLexer lexer = new ColonStatementLexer(new ANTLRStringStream(sql)); Token t = lexer.nextToken(); while (t.getType() != EOF) { switch (t.getType()) { case COMMENT: case LITERAL: case QUOTED_TEXT: case DOUBLE_QUOTED_TEXT: b.append(t.getText()); break; case NAMED_PARAM: stmt.addNamedParam(t.getText().substring(1)); b.append("?"); break; case POSITIONAL_PARAM: b.append("?"); stmt.addPositionalParam(); break; case ESCAPED_TEXT: b.append(t.getText().substring(1)); break; default: break; } t = lexer.nextToken(); } stmt.setParsedSql(b.toString()); return stmt; } }