oracle.toplink.essentials.internal.expressions.ExpressionSQLPrinter Maven / Gradle / Ivy
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* // Copyright (c) 1998, 2007, Oracle. All rights reserved.
*
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can obtain
* a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
* or glassfish/bootstrap/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
* Sun designates this particular file as subject to the "Classpath" exception
* as provided by Sun in the GPL Version 2 section of the License file that
* accompanied this code. If applicable, add the following below the License
* Header, with the fields enclosed by brackets [] replaced by your own
* identifying information: "Portions Copyrighted [year]
* [name of copyright owner]"
*
* Contributor(s):
*
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package oracle.toplink.essentials.internal.expressions;
import java.io.*;
import java.util.*;
import oracle.toplink.essentials.internal.helper.*;
import oracle.toplink.essentials.queryframework.*;
import oracle.toplink.essentials.exceptions.*;
import oracle.toplink.essentials.expressions.*;
import oracle.toplink.essentials.internal.databaseaccess.*;
import oracle.toplink.essentials.internal.sessions.AbstractRecord;
import oracle.toplink.essentials.internal.sessions.AbstractSession;
/**
* Purpose: Expression SQL printer.
*
Responsibilities:
* - Print an expression in SQL format.
*
- Replaces FIELD types with field names from the descriptor.
*
- Replaces PARAMETER types with row or object values.
*
- Calls accessor to print primitive types.
*
* @author Dorin Sandu
* @since TOPLink/Java 1.0
*/
public class ExpressionSQLPrinter {
/**
* Stores the current session. The session accessor
* is used to print all the primitive types.
*/
protected AbstractSession session;
/**
* Stores the call being created.
*/
protected SQLCall call;
/**
* Stores the row. Used to print PARAMETER nodes.
*/
protected AbstractRecord translationRow;
/**
* Indicates whether fully qualified field names
* (owner + table) should be used or not.
*/
protected boolean shouldPrintQualifiedNames;
// What we write on
protected Writer writer;
/** Used for distincts in functions. */
protected boolean requiresDistinct;
// Used in figuring out when to print a comma in the select line
protected boolean isFirstElementPrinted;
public ExpressionSQLPrinter(AbstractSession session, AbstractRecord translationRow, SQLCall call, boolean printQualifiedNames) {
this.session = session;
this.translationRow = translationRow;
this.call = call;
this.shouldPrintQualifiedNames = printQualifiedNames;
this.requiresDistinct = false;
isFirstElementPrinted = false;
}
/**
* Return the call.
*/
protected SQLCall getCall() {
return call;
}
/**
* INTERNAL:
* Return the database platform specific information.
*/
public DatabasePlatform getPlatform() {
return session.getPlatform();
}
protected AbstractSession getSession() {
return session;
}
/**
* INTERNAL:
* Return the row for translation
*/
protected AbstractRecord getTranslationRow() {
return translationRow;
}
public Writer getWriter() {
return writer;
}
/**
* INTERNAL:
* Used in figuring out when to print a comma in the select clause
*/
public boolean isFirstElementPrinted() {
return isFirstElementPrinted;
}
public void printExpression(Expression expression) {
translateExpression(expression);
}
public void printField(DatabaseField field) {
if (field == null) {
return;
}
try {
// Print the field using either short or long notation i.e. owner + table name.
if (shouldPrintQualifiedNames()) {
getWriter().write(field.getQualifiedName());
} else {
getWriter().write(field.getName());
}
} catch (IOException exception) {
throw ValidationException.fileError(exception);
}
}
public void printParameter(ParameterExpression expression) {
try {
getCall().appendTranslationParameter(getWriter(), expression, getPlatform());
} catch (IOException exception) {
throw ValidationException.fileError(exception);
}
}
public void printParameter(DatabaseField field) {
getCall().appendTranslation(getWriter(), field);
}
public void printPrimitive(Object value) {
if (value instanceof Vector) {
printValuelist((Vector)value);
return;
}
session.getPlatform().appendLiteralToCall(getCall(), getWriter(), value);
}
public void printNull(ConstantExpression nullValueExpression) {
if(session.getPlatform().shouldBindLiterals()) {
DatabaseField field = null;
Expression localBase = nullValueExpression.getLocalBase();
if(localBase.isFieldExpression()) {
field = ((FieldExpression)localBase).getField();
} else if(localBase.isQueryKeyExpression()) {
field = ((QueryKeyExpression)localBase).getField();
}
session.getPlatform().appendLiteralToCall(getCall(), getWriter(), field);
} else {
session.getPlatform().appendLiteralToCall(getCall(), getWriter(), null);
}
}
public void printString(String value) {
try {
getWriter().write(value);
} catch (IOException exception) {
throw ValidationException.fileError(exception);
}
}
public void printValuelist(Vector values) {
try {
Enumeration valuesEnum = values.elements();
while (valuesEnum.hasMoreElements()) {
Object value = valuesEnum.nextElement();
session.getPlatform().appendLiteralToCall(getCall(), getWriter(), value);
if (valuesEnum.hasMoreElements()) {
getWriter().write(", ");
}
}
} catch (IOException exception) {
throw ValidationException.fileError(exception);
}
}
/**
* If a distinct has been set the DISTINCT clause will be printed.
* This is required for batch reading.
*/
public boolean requiresDistinct() {
return requiresDistinct;
}
protected void setCall(SQLCall call) {
this.call = call;
}
/**
* INTERNAL:
* Used in figuring out when to print a comma in the select clause
*/
public void setIsFirstElementPrinted(boolean isFirstElementPrinted) {
this.isFirstElementPrinted = isFirstElementPrinted;
}
/**
* If a distinct has been set the DISTINCT clause will be printed.
* This is required for batch reading.
*/
public void setRequiresDistinct(boolean requiresDistinct) {
this.requiresDistinct = requiresDistinct;
}
protected void setSession(AbstractSession theSession) {
session = theSession;
}
protected void setShouldPrintQualifiedNames(boolean shouldPrintQualifiedNames) {
this.shouldPrintQualifiedNames = shouldPrintQualifiedNames;
}
/**
* INTERNAL:
* Set the row for translation
*/
protected void setTranslationRow(AbstractRecord theRow) {
translationRow = theRow;
}
public void setWriter(Writer writer) {
this.writer = writer;
}
public boolean shouldPrintParameterValues() {
return getTranslationRow() != null;
}
protected boolean shouldPrintQualifiedNames() {
return shouldPrintQualifiedNames;
}
/**
* Translate an expression i.e. call the appropriate
* translation method for the expression based on its
* type. The translation method is then responsible
* for translating the subexpressions.
*/
protected void translateExpression(Expression theExpression) {
theExpression.printSQL(this);
}
}