| /* |
| |
| Derby - Class org.apache.derby.impl.sql.compile.SetRoleNode |
| |
| Licensed to the Apache Software Foundation (ASF) under one or more |
| contributor license agreements. See the NOTICE file distributed with |
| this work for additional information regarding copyright ownership. |
| The ASF licenses this file to you 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.apache.derby.impl.sql.compile; |
| |
| import java.util.List; |
| import org.apache.derby.iapi.error.StandardException; |
| import org.apache.derby.iapi.reference.ClassName; |
| import org.apache.derby.iapi.services.classfile.VMOpcode; |
| import org.apache.derby.iapi.services.compiler.MethodBuilder; |
| import org.apache.derby.iapi.services.context.ContextManager; |
| import org.apache.derby.shared.common.sanity.SanityManager; |
| import org.apache.derby.iapi.sql.StatementType; |
| import org.apache.derby.iapi.sql.execute.ConstantAction; |
| |
| /** |
| * A SetRoleNode is the root of a QueryTree that represents a SET ROLE |
| * statement. |
| */ |
| |
| class SetRoleNode extends MiscellaneousStatementNode |
| { |
| private String name; |
| private int type; |
| |
| /** |
| * |
| * @param roleName The name of the new role, null if NONE specified |
| * @param type Type of role name could be USER or dynamic parameter |
| * @param cm Context manager |
| * @throws StandardException |
| */ |
| SetRoleNode( |
| String roleName, |
| int type, |
| ContextManager cm) throws StandardException { |
| super(cm); |
| this.name = roleName; |
| this.type = type; |
| } |
| |
| /** |
| * Convert this object to a String. See comments in QueryTreeNode.java |
| * for how this should be done for tree printing. |
| * |
| * @return This object as a String |
| */ |
| @Override |
| public String toString() |
| { |
| if (SanityManager.DEBUG) { |
| return super.toString() + |
| (type == StatementType.SET_ROLE_DYNAMIC ? |
| "roleName: ?\n" : |
| "rolename: " + name + "\n"); |
| } else { |
| return ""; |
| } |
| } |
| |
| public String statementToString() |
| { |
| return "SET ROLE"; |
| } |
| |
| /** |
| * Create the Constant information that will drive the guts of |
| * Execution. |
| * |
| * @exception StandardException Thrown on failure |
| */ |
| @Override |
| public ConstantAction makeConstantAction() throws StandardException |
| { |
| return getGenericConstantActionFactory(). |
| getSetRoleConstantAction(name, type); |
| } |
| /** |
| * Override: Generate code, need to push parameters |
| * |
| * @param acb The ActivationClassBuilder for the class being built |
| * @param mb the method for the execute() method to be built |
| * |
| * @exception StandardException Thrown on error |
| */ |
| @Override |
| void generate(ActivationClassBuilder acb, MethodBuilder mb) |
| throws StandardException |
| { |
| //generate the parameters for the DYNAMIC SET ROLE |
| if (type == StatementType.SET_ROLE_DYNAMIC) { |
| generateParameterValueSet(acb); |
| } |
| // The generated java is the expression: |
| // return ResultSetFactory.getMiscResultSet(this ) |
| |
| acb.pushGetResultSetFactoryExpression(mb); |
| |
| acb.pushThisAsActivation(mb); // first arg |
| |
| mb.callMethod(VMOpcode.INVOKEINTERFACE, (String)null, |
| "getMiscResultSet", ClassName.ResultSet, 1); |
| } |
| /** |
| * Generate the code to create the ParameterValueSet, if necessary, |
| * when constructing the activation. Also generate the code to call |
| * a method that will throw an exception if we try to execute without |
| * all the parameters being set. |
| * |
| * @param acb The ActivationClassBuilder for the class we're building |
| * |
| * @exception StandardException Thrown on error |
| */ |
| |
| private void generateParameterValueSet(ActivationClassBuilder acb) |
| throws StandardException |
| { |
| List<ParameterNode> |
| parameterList = getCompilerContext().getParameterList(); |
| // parameter list size should be 1 |
| if (SanityManager.DEBUG) { |
| SanityManager.ASSERT(parameterList != null && |
| parameterList.size() == 1); |
| } |
| ParameterNode.generateParameterValueSet (acb, 1, parameterList); |
| } |
| |
| /** |
| * Override: Returns the type of activation this class |
| * generates. |
| * |
| * @return NEED_PARAM_ACTIVATION or |
| * NEED_NOTHING_ACTIVATION depending on params |
| * |
| */ |
| @Override |
| int activationKind() |
| { |
| /* |
| ** We need parameters only for those that have parameters. |
| */ |
| if (type == StatementType.SET_ROLE_DYNAMIC) { |
| return StatementNode.NEED_PARAM_ACTIVATION; |
| } else { |
| return StatementNode.NEED_NOTHING_ACTIVATION; |
| } |
| } |
| |
| |
| /** |
| * Override to allow committing of reading SYSROLES, |
| * cf. SetRoleConstantAction's call to userCommit to retain idle |
| * state. If atomic, that commit will fail. |
| * |
| * @return false |
| */ |
| @Override |
| public boolean isAtomic() |
| { |
| return false; |
| } |
| |
| |
| } |