java/engine/org/apache/derby/impl/sql/compile/DropRoleNode.java

/*

   Derby - Class org.apache.derby.impl.sql.compile.DropRoleNode

   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 org.apache.derby.iapi.error.StandardException;
import org.apache.derby.iapi.services.context.ContextManager;
import org.apache.derby.shared.common.sanity.SanityManager;
import org.apache.derby.iapi.sql.compile.CompilerContext;
import org.apache.derby.iapi.sql.conn.Authorizer;
import org.apache.derby.iapi.sql.execute.ConstantAction;

/**
 * A DropRoleNode is the root of a QueryTree that represents
 * a DROP ROLE statement.
 *
 */

class DropRoleNode extends DDLStatementNode
{
    private String roleName;

    /**
     * Constructor for a DropRoleNode
     *
     * @param roleName      The name of the object being dropped
     * @param cm            Context manager
     *
     */
    DropRoleNode(String roleName, ContextManager cm) throws StandardException
    {
        super(null, cm);
        this.roleName = roleName;
    }

    @Override
    public void bindStatement() throws StandardException
    {
        CompilerContext cc = getCompilerContext();
        if (isPrivilegeCollectionRequired()) {
            cc.addRequiredRolePriv(roleName, Authorizer.DROP_ROLE_PRIV);
        }
    }

    /**
     * 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() +
                "roleName: " +  roleName + "\n";
        } else {
            return "";
        }
    }

    @Override
    public String statementToString()
    {
        return "DROP ROLE";
    }

    // inherit generate() method from DDLStatementNode

    /**
     * Create the Constant information that will drive the guts of Execution.
     *
     * @exception StandardException         Thrown on failure
     */
    @Override
    public ConstantAction   makeConstantAction() throws StandardException
    {
        return  getGenericConstantActionFactory().
            getDropRoleConstantAction(roleName);
    }
}