add a dialect-deparser module and use it in guard

.editorconfig

@@ -45,3 +45,6 @@ insert_final_newline = unset
 trim_trailing_whitespace = unset
 indent_style = unset
 indent_size = unset
+
+[.flattened-pom.xml]
+insert_final_newline = false

deparser/api/pom.xml

@@ -0,0 +1,39 @@
+<?xml version="1.0"?>
+<!--
+/*********************************************************************
+* Copyright (c) 2025 Contributors to the Eclipse Foundation.
+*
+* This program and the accompanying materials are made
+* available under the terms of the Eclipse Public License 2.0
+* which is available at https://www.eclipse.org/legal/epl-2.0/
+*
+* SPDX-License-Identifier: EPL-2.0
+**********************************************************************/
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <parent>
+    <groupId>org.eclipse.daanse</groupId>
+    <artifactId>org.eclipse.daanse.sql.deparser</artifactId>
+    <version>${revision}</version>
+  </parent>
+  <artifactId>org.eclipse.daanse.sql.deparser.api</artifactId>
+  <name>Daanse SQL Deparser API</name>
+  <description>API interfaces for SQL deparser factory and dialect-aware SQL
+    generation.</description>
+
+  <dependencies>
+    <dependency>
+      <groupId>org.eclipse.daanse</groupId>
+      <artifactId>org.eclipse.daanse.jdbc.db.dialect.api</artifactId>
+      <version>0.0.1-SNAPSHOT</version>
+    </dependency>
+    <dependency>
+      <groupId>com.github.jsqlparser</groupId>
+      <artifactId>jsqlparser</artifactId>
+      <version>5.4-SNAPSHOT</version>
+    </dependency>
+  </dependencies>
+</project>

deparser/api/src/main/java/org/eclipse/daanse/sql/deparser/api/DialectDeparser.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2025 Contributors to the Eclipse Foundation.
+ *
+ * This program and the accompanying materials are made
+ * available under the terms of the Eclipse Public License 2.0
+ * which is available at https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *   SmartCity Jena - initial
+ *   Stefan Bischof (bipolis.org) - initial
+ */
+package org.eclipse.daanse.sql.deparser.api;
+
+import org.eclipse.daanse.jdbc.db.dialect.api.Dialect;
+
+/**
+ * Dialect-aware SQL deparsers.
+ */
+public interface DialectDeparser {
+
+    /**
+     * Deparses a SQL statement using the given dialect.
+     *
+     * @param statement the JSqlParser statement to deparse
+     * @param dialect   the database dialect to use for SQL generation
+     * @return the generated SQL string
+     */
+    String deparse(net.sf.jsqlparser.statement.Statement statement, Dialect dialect);
+}

deparser/api/src/main/java/org/eclipse/daanse/sql/deparser/api/package-info.java

@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2024 Contributors to the Eclipse Foundation.
+ *
+ * This program and the accompanying materials are made
+ * available under the terms of the Eclipse Public License 2.0
+ * which is available at https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *   SmartCity Jena - initial
+ *   Stefan Bischof (bipolis.org) - initial
+ */
+
+/**
+ * API interfaces for SQL deparser factory and dialect-aware SQL generation.
+ * <p>
+ * This package provides the factory interface for creating dialect-aware SQL deparsers
+ * that generate proper SQL syntax according to the target database dialect.
+ */
+@org.osgi.annotation.bundle.Export
+@org.osgi.annotation.versioning.Version("0.0.1")
+package org.eclipse.daanse.sql.deparser.api;

deparser/jsqlparser/pom.xml

@@ -0,0 +1,49 @@
+<?xml version="1.0"?>
+<!--
+/*********************************************************************
+* Copyright (c) 2025 Contributors to the Eclipse Foundation.
+*
+* This program and the accompanying materials are made
+* available under the terms of the Eclipse Public License 2.0
+* which is available at https://www.eclipse.org/legal/epl-2.0/
+*
+* SPDX-License-Identifier: EPL-2.0
+**********************************************************************/
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <parent>
+    <groupId>org.eclipse.daanse</groupId>
+    <artifactId>org.eclipse.daanse.sql.deparser</artifactId>
+    <version>${revision}</version>
+  </parent>
+  <artifactId>org.eclipse.daanse.sql.deparser.jsqlparser</artifactId>
+  <name>Daanse SQL Deparser JSqlParser Implementation</name>
+  <description>JSqlParser-based implementation of SQL deparser with
+    comprehensive dialect support.</description>
+
+  <dependencies>
+    <dependency>
+      <groupId>org.eclipse.daanse</groupId>
+      <artifactId>org.eclipse.daanse.sql.deparser.api</artifactId>
+      <version>${project.version}</version>
+    </dependency>
+    <dependency>
+      <groupId>org.eclipse.daanse</groupId>
+      <artifactId>org.eclipse.daanse.jdbc.db.dialect.api</artifactId>
+      <version>0.0.1-SNAPSHOT</version>
+    </dependency>
+    <dependency>
+      <groupId>org.eclipse.daanse</groupId>
+      <artifactId>org.eclipse.daanse.jdbc.db.dialect.db.common</artifactId>
+      <version>0.0.1-SNAPSHOT</version>
+    </dependency>
+    <dependency>
+      <groupId>com.github.jsqlparser</groupId>
+      <artifactId>jsqlparser</artifactId>
+      <version>5.4-SNAPSHOT</version>
+    </dependency>
+  </dependencies>
+</project>

deparser/jsqlparser/src/main/java/org/eclipse/daanse/sql/deparser/jsqlparser/BasicDialectDeparser.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2025 Contributors to the Eclipse Foundation.
+ *
+ * This program and the accompanying materials are made
+ * available under the terms of the Eclipse Public License 2.0
+ * which is available at https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *   SmartCity Jena - initial
+ *   Stefan Bischof (bipolis.org) - initial
+ */
+package org.eclipse.daanse.sql.deparser.jsqlparser;
+
+import org.eclipse.daanse.jdbc.db.dialect.api.Dialect;
+import org.eclipse.daanse.sql.deparser.api.DialectDeparser;
+import org.osgi.service.component.annotations.Component;
+import org.osgi.service.component.annotations.ServiceScope;
+
+import net.sf.jsqlparser.statement.Statement;
+import net.sf.jsqlparser.util.deparser.StatementDeParser;
+
+/**
+ * Factory implementation for creating dialect-aware SQL deparsers.
+ */
+@Component(service = DialectDeparser.class,scope = ServiceScope.SINGLETON)
+public class BasicDialectDeparser implements DialectDeparser {
+
+    @Override
+    public String deparse(Statement statement, Dialect dialect) {
+        StringBuilder buffer = new StringBuilder();
+        StatementDeParser deparser = new BasicDialectStatementDeParser(buffer, dialect);
+        statement.accept(deparser);
+        return buffer.toString();
+    }
+}

deparser/jsqlparser/src/main/java/org/eclipse/daanse/sql/deparser/jsqlparser/BasicDialectExpressionDeParser.java

@@ -0,0 +1,125 @@
+/*
+ * Copyright (c) 2025 Contributors to the Eclipse Foundation.
+ *
+ * This program and the accompanying materials are made
+ * available under the terms of the Eclipse Public License 2.0
+ * which is available at https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *   SmartCity Jena - initial
+ *   Stefan Bischof (bipolis.org) - initial
+ */
+package org.eclipse.daanse.sql.deparser.jsqlparser;
+
+import org.eclipse.daanse.jdbc.db.dialect.api.Dialect;
+
+import net.sf.jsqlparser.expression.DateValue;
+import net.sf.jsqlparser.expression.DoubleValue;
+import net.sf.jsqlparser.expression.LongValue;
+import net.sf.jsqlparser.expression.StringValue;
+import net.sf.jsqlparser.expression.TimeValue;
+import net.sf.jsqlparser.expression.TimestampValue;
+import net.sf.jsqlparser.schema.Column;
+import net.sf.jsqlparser.schema.Table;
+import net.sf.jsqlparser.statement.select.SelectVisitor;
+import net.sf.jsqlparser.util.deparser.ExpressionDeParser;
+
+public class BasicDialectExpressionDeParser extends ExpressionDeParser {
+
+    private final Dialect dialect;
+
+    public BasicDialectExpressionDeParser(Dialect dialect) {
+        super();
+        this.builder = new StringBuilder();
+        this.dialect = dialect;
+    }
+
+    public BasicDialectExpressionDeParser(SelectVisitor<StringBuilder> selectVisitor, StringBuilder buffer,
+            Dialect dialect) {
+        super(selectVisitor, buffer);
+        this.dialect = dialect;
+    }
+
+    // Identifier Quoting
+
+    @Override
+    public <S> StringBuilder visit(Column tableColumn, S context) {
+        final Table table = tableColumn.getTable();
+        String tableName = null;
+
+        if (table != null) {
+            if (table.getAlias() != null) {
+                tableName = table.getAlias().getName();
+            } else {
+                tableName = table.getFullyQualifiedName();
+            }
+        }
+
+        if (tableName != null && !tableName.isEmpty()) {
+            dialect.quoteIdentifier(builder, tableName, tableColumn.getColumnName());
+        } else {
+            dialect.quoteIdentifier(builder, tableColumn.getColumnName());
+        }
+
+        if (tableColumn.getArrayConstructor() != null) {
+            tableColumn.getArrayConstructor().accept(this, context);
+        }
+
+        if (tableColumn.getCommentText() != null) {
+            builder.append(" /* ").append(tableColumn.getCommentText()).append(" */");
+        }
+
+        return builder;
+    }
+
+    // String Literal Quoting
+
+    @Override
+    public <S> StringBuilder visit(StringValue stringValue, S context) {
+        if (stringValue.getPrefix() != null) {
+            builder.append(stringValue.getPrefix());
+        }
+        dialect.quoteStringLiteral(builder, stringValue.getValue());
+        return builder;
+    }
+
+    // Date/Time/Timestamp Literal Quoting
+
+    @Override
+    public <S> StringBuilder visit(DateValue dateValue, S context) {
+        dialect.quoteDateLiteral(builder, dateValue.getValue().toString());
+        return builder;
+    }
+
+    @Override
+    public <S> StringBuilder visit(TimeValue timeValue, S context) {
+        dialect.quoteTimeLiteral(builder, timeValue.getValue().toString());
+        return builder;
+    }
+
+    @Override
+    public <S> StringBuilder visit(TimestampValue timestampValue, S context) {
+        dialect.quoteTimestampLiteral(builder, timestampValue.getValue().toString());
+        return builder;
+    }
+
+    // Numeric Literal Formatting
+
+    @Override
+    public <S> StringBuilder visit(LongValue longValue, S context) {
+        dialect.quoteNumericLiteral(builder, longValue.getStringValue());
+        return builder;
+    }
+
+    @Override
+    public <S> StringBuilder visit(DoubleValue doubleValue, S context) {
+        String valueString = doubleValue.toString();
+        if (dialect.needsExponent(doubleValue.getValue(), valueString)) {
+            valueString += "E0";
+        }
+        dialect.quoteNumericLiteral(builder, valueString);
+        return builder;
+    }
+}