Implement Oracle Alter Session Statements (#1234)

* Implement Oracle Alter Session Statements according to https://docs.oracle.com/cd/B19306_01/server.102/b14200/statements_2012.htm

* Implement PMD Rule "SwitchStmtsShouldHaveDefault"

* Reorganize Test Case imports

pmd-rules.xml

@@ -75,6 +75,7 @@ under the License.
     <!-- for Codazy -->
     <rule ref="category/java/design.xml/CyclomaticComplexity" />
     <rule ref="category/java/design.xml/ExcessiveMethodLength" />
+    <rule ref="category/java/bestpractices.xml/SwitchStmtsShouldHaveDefault" />
 
     <rule ref="category/java/errorprone.xml/AvoidBranchingStatementAsLastInLoop" />
     <rule ref="category/java/errorprone.xml/AvoidDecimalLiteralsInBigDecimalConstructor" />

src/main/java/net/sf/jsqlparser/statement/StatementVisitor.java

@@ -10,6 +10,7 @@
 package net.sf.jsqlparser.statement;
 
 import net.sf.jsqlparser.statement.alter.Alter;
+import net.sf.jsqlparser.statement.alter.AlterSession;
 import net.sf.jsqlparser.statement.alter.sequence.AlterSequence;
 import net.sf.jsqlparser.statement.comment.Comment;
 import net.sf.jsqlparser.statement.create.index.CreateIndex;
@@ -102,4 +103,6 @@ public interface StatementVisitor {
     void visit(CreateFunctionalStatement createFunctionalStatement);
 
     void visit(CreateSynonym createSynonym);
+
+    void visit(AlterSession alterSession);
 }

src/main/java/net/sf/jsqlparser/statement/StatementVisitorAdapter.java

@@ -10,6 +10,7 @@
 package net.sf.jsqlparser.statement;
 
 import net.sf.jsqlparser.statement.alter.Alter;
+import net.sf.jsqlparser.statement.alter.AlterSession;
 import net.sf.jsqlparser.statement.alter.sequence.AlterSequence;
 import net.sf.jsqlparser.statement.comment.Comment;
 import net.sf.jsqlparser.statement.create.index.CreateIndex;
@@ -190,4 +191,9 @@ public void visit(CreateFunctionalStatement createFunctionalStatement) {
     @Override
     public void visit(CreateSynonym createSynonym) {
     }
+
+    @Override
+    public void visit(AlterSession alterSession) {
+        throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
+    }
 }

src/main/java/net/sf/jsqlparser/statement/alter/AlterSession.java

@@ -0,0 +1,167 @@
+/*-
+ * #%L
+ * JSQLParser library
+ * %%
+ * Copyright (C) 2004 - 2021 JSQLParser
+ * %%
+ * Dual licensed under GNU LGPL 2.1 or Apache License 2.0
+ * #L%
+ */
+/*
+ * Copyright (C) 2021 JSQLParser.
+ *
+ * This library is free software; you can redistribute it and/or modify it under the terms of the
+ * GNU Lesser General Public License as published by the Free Software Foundation; either version
+ * 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
+ * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with this library;
+ * if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+package net.sf.jsqlparser.statement.alter;
+
+import java.util.List;
+import net.sf.jsqlparser.statement.Statement;
+import net.sf.jsqlparser.statement.StatementVisitor;
+
+/**
+ *
+ * @author are
+ * @@link  https://docs.oracle.com/cd/B19306_01/server.102/b14200/statements_2012.htm
+ */
+public class AlterSession implements Statement  {
+    private AlterSessionOperation operation;
+    private List<String> parameters;
+
+    public AlterSession(AlterSessionOperation operation, List<String> parameters) {
+        this.operation = operation;
+        this.parameters = parameters;
+    }
+
+    public AlterSessionOperation getOperation() {
+        return operation;
+    }
+
+    public void setOperation(AlterSessionOperation operation) {
+        this.operation = operation;
+    }
+
+    public List<String> getParameters() {
+        return parameters;
+    }
+
+    public void setParameters(List<String> parameters) {
+        this.parameters = parameters;
+    }
+
+    private static void appendParamaters(StringBuilder builder, List<String> parameters) {
+        for (String s: parameters) {
+            builder.append(" ").append(s);
+        }
+    }
+
+    @Override
+    @SuppressWarnings({"PMD.ExcessiveMethodLength", "PMD.CyclomaticComplexity"})  
+    public String toString() {
+        StringBuilder builder = new StringBuilder();
+        builder.append("ALTER SESSION ");
+        switch (operation) {
+            case ADVISE_COMMIT:
+                builder.append("ADVISE COMMIT");
+                break;
+            case ADVISE_ROLLBACK:
+                builder.append("ADVISE ROLLBACK");
+                break;
+            case ADVISE_NOTHING:
+                builder.append("ADVISE NOTHING");
+                break;
+            case CLOSE_DATABASE_LINK:
+                builder.append("CLOSE DATABASE LINK ");
+                appendParamaters(builder, parameters);
+                break;
+            case ENABLE_COMMIT_IN_PROCEDURE:
+                builder.append("ENABLE COMMIT IN PROCEDURE");
+                break;
+            case DISABLE_COMMIT_IN_PROCEDURE:
+                builder.append("DISABLE COMMIT IN PROCEDURE");
+                break;
+            case ENABLE_GUARD:
+                builder.append("ENABLE GUARD");
+                break;
+            case DISABLE_GUARD:
+                builder.append("DISABLE GUARD");
+                break;
+
+            case ENABLE_PARALLEL_DML:
+                builder.append("ENABLE PARALLEL DML");
+                appendParamaters(builder, parameters);
+                break;
+
+            case DISABLE_PARALLEL_DML:
+                builder.append("DISABLE PARALLEL DML");
+                appendParamaters(builder, parameters);
+                break;
+
+            case FORCE_PARALLEL_DML:
+                builder.append("FORCE PARALLEL DML");
+                appendParamaters(builder, parameters);
+                break;
+
+            case ENABLE_PARALLEL_DDL:
+                builder.append("ENABLE PARALLEL DDL");
+                appendParamaters(builder, parameters);
+                break;
+
+            case DISABLE_PARALLEL_DDL:
+                builder.append("DISABLE PARALLEL DDL");
+                break;
+
+            case FORCE_PARALLEL_DDL:
+                builder.append("FORCE PARALLEL DDL");
+                appendParamaters(builder, parameters);
+                break;
+
+            case ENABLE_PARALLEL_QUERY:
+                builder.append("ENABLE PARALLEL QUERY");
+                appendParamaters(builder, parameters);
+                break;
+
+            case DISABLE_PARALLEL_QUERY:
+                builder.append("DISABLE PARALLEL QUERY");
+                break;
+
+            case FORCE_PARALLEL_QUERY:
+                builder.append("FORCE PARALLEL QUERY");
+                appendParamaters(builder, parameters);
+                break;
+
+            case ENABLE_RESUMABLE:
+                builder.append("ENABLE RESUMABLE");
+                appendParamaters(builder, parameters);
+                break;
+
+            case DISABLE_RESUMABLE:
+                builder.append("DISABLE RESUMABLE");
+                break;
+
+            case SET:
+                builder.append("SET");
+                appendParamaters(builder, parameters);
+                break;
+            default:
+                // not going to happen
+
+        }
+        return builder.toString();
+    }
+
+    @Override
+    public void accept(StatementVisitor statementVisitor) {
+        statementVisitor.visit(this);
+    }
+}

src/main/java/net/sf/jsqlparser/statement/alter/AlterSessionOperation.java

@@ -0,0 +1,53 @@
+/*-
+ * #%L
+ * JSQLParser library
+ * %%
+ * Copyright (C) 2004 - 2021 JSQLParser
+ * %%
+ * Dual licensed under GNU LGPL 2.1 or Apache License 2.0
+ * #L%
+ */
+/*
+ * Copyright (C) 2021 JSQLParser.
+ *
+ * This library is free software; you can redistribute it and/or modify it under the terms of the
+ * GNU Lesser General Public License as published by the Free Software Foundation; either version
+ * 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
+ * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with this library;
+ * if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+package net.sf.jsqlparser.statement.alter;
+
+/**
+ *
+ * @author are
+ */
+public enum AlterSessionOperation {
+        ADVISE_COMMIT
+        , ADVISE_ROLLBACK
+        , ADVISE_NOTHING
+        , CLOSE_DATABASE_LINK
+        , ENABLE_COMMIT_IN_PROCEDURE
+        , DISABLE_COMMIT_IN_PROCEDURE
+        , ENABLE_GUARD
+        , DISABLE_GUARD
+        , ENABLE_PARALLEL_DML
+        , DISABLE_PARALLEL_DML
+        , FORCE_PARALLEL_DML
+        , ENABLE_PARALLEL_DDL
+        , DISABLE_PARALLEL_DDL
+        , FORCE_PARALLEL_DDL
+        , ENABLE_PARALLEL_QUERY
+        , DISABLE_PARALLEL_QUERY
+        , FORCE_PARALLEL_QUERY
+        , ENABLE_RESUMABLE
+        , DISABLE_RESUMABLE
+        , SET
+    }

src/main/java/net/sf/jsqlparser/statement/create/view/CreateView.java

@@ -116,6 +116,8 @@ public String toString() {
             case NO_FORCE:
                 sql.append("NO FORCE ");
                 break;
+            default:
+                // nothing
         }
 
         if (temp != TemporaryOption.NONE) {

src/main/java/net/sf/jsqlparser/util/TablesNamesFinder.java

@@ -65,6 +65,7 @@
 import net.sf.jsqlparser.schema.Table;
 import net.sf.jsqlparser.statement.*;
 import net.sf.jsqlparser.statement.alter.Alter;
+import net.sf.jsqlparser.statement.alter.AlterSession;
 import net.sf.jsqlparser.statement.alter.sequence.AlterSequence;
 import net.sf.jsqlparser.statement.comment.Comment;
 import net.sf.jsqlparser.statement.create.index.CreateIndex;
@@ -987,4 +988,8 @@ private static <T> void throwUnsupported(T type){
     public void visit(TimezoneExpression aThis) {
         aThis.getLeftExpression().accept(this);
     }
+
+    @Override
+    public void visit(AlterSession alterSession) {
+    }
 }

src/main/java/net/sf/jsqlparser/util/deparser/AlterSessionDeParser.java

@@ -0,0 +1,25 @@
+/*-
+ * #%L
+ * JSQLParser library
+ * %%
+ * Copyright (C) 2004 - 2019 JSQLParser
+ * %%
+ * Dual licensed under GNU LGPL 2.1 or Apache License 2.0
+ * #L%
+ */
+package net.sf.jsqlparser.util.deparser;
+
+import net.sf.jsqlparser.statement.alter.AlterSession;
+
+public class AlterSessionDeParser extends AbstractDeParser<AlterSession> {
+
+    public AlterSessionDeParser(StringBuilder buffer) {
+        super(buffer);
+    }
+
+    @Override
+    public void deParse(AlterSession alterSession) {
+        buffer.append(alterSession.toString());
+    }
+
+}

src/main/java/net/sf/jsqlparser/util/deparser/CreateViewDeParser.java

@@ -50,6 +50,8 @@ public void deParse(CreateView createView) {
             break;
         case NONE:
             break;
+        default:
+            // nothing
         }
         if (createView.getTemporary() != TemporaryOption.NONE) {
             buffer.append(createView.getTemporary().name()).append(" ");

src/main/java/net/sf/jsqlparser/util/deparser/StatementDeParser.java

@@ -26,6 +26,7 @@
 import net.sf.jsqlparser.statement.Statements;
 import net.sf.jsqlparser.statement.UseStatement;
 import net.sf.jsqlparser.statement.alter.Alter;
+import net.sf.jsqlparser.statement.alter.AlterSession;
 import net.sf.jsqlparser.statement.alter.sequence.AlterSequence;
 import net.sf.jsqlparser.statement.comment.Comment;
 import net.sf.jsqlparser.statement.create.index.CreateIndex;
@@ -320,4 +321,9 @@ public void visit(CreateSynonym createSynonym) {
     void deParse(Statement statement) {
         statement.accept(this);
     }
+
+    @Override
+    public void visit(AlterSession alterSession) {
+        new AlterSessionDeParser(buffer).deParse(alterSession);
+    }
 }

src/main/java/net/sf/jsqlparser/util/validation/validator/AlterSessionValidator.java

@@ -0,0 +1,22 @@
+/*-
+ * #%L
+ * JSQLParser library
+ * %%
+ * Copyright (C) 2004 - 2020 JSQLParser
+ * %%
+ * Dual licensed under GNU LGPL 2.1 or Apache License 2.0
+ * #L%
+ */
+package net.sf.jsqlparser.util.validation.validator;
+
+import net.sf.jsqlparser.statement.alter.AlterSession;
+
+/**
+ * @author gitmotte
+ */
+public class AlterSessionValidator extends AbstractValidator<AlterSession> {
+    @Override
+    public void validate(AlterSession statement) {
+        //@todo: implement this method
+    }
+}

src/main/java/net/sf/jsqlparser/util/validation/validator/StatementValidator.java

@@ -24,6 +24,7 @@
 import net.sf.jsqlparser.statement.Statements;
 import net.sf.jsqlparser.statement.UseStatement;
 import net.sf.jsqlparser.statement.alter.Alter;
+import net.sf.jsqlparser.statement.alter.AlterSession;
 import net.sf.jsqlparser.statement.alter.sequence.AlterSequence;
 import net.sf.jsqlparser.statement.comment.Comment;
 import net.sf.jsqlparser.statement.create.function.CreateFunction;
@@ -254,4 +255,9 @@ public void visit(CreateSynonym createSynonym) {
         getValidator(CreateSynonymValidator.class).validate(createSynonym);
     }
 
+    @Override
+    public void visit(AlterSession alterSession) {
+        throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
+    }
+
 }