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/*******************************************************************************
* Copyright (c) 2013, 2015 Oracle, IBM Corporation. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
* which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
* Oracle - initial API and implementation from Oracle TopLink
* 02/19/2015 - Rick Curtis
* - 458877 : Add national character support
******************************************************************************/
package org.eclipse.persistence.internal.sessions;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.util.Vector;
import org.eclipse.persistence.exceptions.DatabaseException;
import org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor;
import org.eclipse.persistence.internal.databaseaccess.DatabasePlatform;
import org.eclipse.persistence.internal.helper.ClassConstants;
import org.eclipse.persistence.internal.helper.DatabaseField;
/**
* PERF: Record used by ObjectLevelReadQuery ResultSet optimization.
* This is a subclass of ResultSetRecord that's used with simple descriptors
* (descriptor.getObjectBuilder().isSimple()) - those having only DirectToField mappings.
* In this case the record is not cached by any mapping therefore could be reused
* in ReadAllQuery - (which calls resultSet.next()).
* In case the cached object used instead of creating a new one from the record,
* the not needed fields' values are never obtained from resultSet
* (that's especially important for expensive LOBs).
* If alternatively the record is used to populate an object then all
* the values obtained from resultSet are nullified after use.
*/
public class SimpleResultSetRecord extends ResultSetRecord {
/** Indicates whether the values requested while populating object (isPopulatingObject == true) should be saved in valuesArray */
transient protected boolean shouldKeepValues;
/** Indicates whether to use optimization while getting values from result set instead of calling accessor.getObject method. */
transient protected boolean shouldUseOptimization;
/**
* Indicates that the whole object is being populated.
* At first the primary key is extracted from the row - to see
* if the object with the same pk is already in the cache.
* Then in case of refresh the locking field value is extracted, too.
* Indication of the object being populated from the record (looping through all the mappings)
* is request for a value, which has been already returned before (usually primary key, but may be version).
* At this point the flag is set to true.
*/
transient protected boolean isPopulatingObject;
protected SimpleResultSetRecord() {
super();
}
public SimpleResultSetRecord(Vector fields, DatabaseField[] fieldsArray, ResultSet resultSet, ResultSetMetaData metaData, DatabaseAccessor accessor, AbstractSession session, DatabasePlatform platform, boolean optimizeData) {
super(fields, fieldsArray, resultSet, metaData, accessor, session, platform, optimizeData);
}
/**
* Obtains all the value from resultSet and removes it.
* resultSet must be non null.
*/
public void loadAllValuesFromResultSet() {
int size = this.valuesArray.length;
for (int index = 0; index < size; index++) {
if (this.valuesArray[index] == null) {
DatabaseField field = this.fieldsArray[index];
// Field can be null for fetch groups.
if (field != null) {
this.valuesArray[index] = getValueFromResultSet(index, field);
}
}
}
this.resultSet = null;
this.metaData = null;
this.accessor = null;
this.platform = null;
this.session = null;
}
/**
* INTERNAL:
* Retrieve the value for the field. If missing null is returned.
*/
@Override
public Object get(DatabaseField key) {
if (this.fieldsArray != null) {
// Optimize check.
int index = key.index;
if ((index < 0) || (index >= this.size)) {
index = 0;
}
DatabaseField field = this.fieldsArray[index];
if ((field != key) && !field.equals(key)) {
index = -1;
for (int fieldIndex = 0; fieldIndex < this.size; fieldIndex++) {
field = this.fieldsArray[fieldIndex];
if ((field == key) || field.equals(key)) {
// PERF: If the fields index was not set, then set it.
if (key.index == -1) {
key.setIndex(fieldIndex);
}
index = fieldIndex;
break;
}
}
if (index < 0) {
return null;
}
}
if (this.resultSet != null) {
Object value = this.valuesArray[index];
if (value != null) {
if (!this.isPopulatingObject) {
this.isPopulatingObject = true;
}
if (!this.shouldKeepValues) {
this.valuesArray[index] = null;
}
} else {
if (this.shouldUseOptimization) {
try {
Class fieldType = field.getType();
if (fieldType == ClassConstants.STRING) {
if(platform.shouldUseGetSetNString()){
value = resultSet.getNString(index + 1);
}else {
value = resultSet.getString(index + 1);
}
} else if (fieldType == ClassConstants.LONG) {
value = resultSet.getLong(index + 1);
} else if (fieldType == ClassConstants.INTEGER) {
value = resultSet.getInt(index + 1);
} else {
value = this.accessor.getObject(this.resultSet, field, this.metaData, index + 1, this.platform, this.optimizeData, this.session);
}
} catch (SQLException exception) {
DatabaseException commException = this.accessor.processExceptionForCommError(session, exception, null);
if (commException != null) {
throw commException;
}
throw DatabaseException.sqlException(exception, accessor, session, false);
} } else {
value = this.accessor.getObject(this.resultSet, field, this.metaData, index + 1, this.platform, this.optimizeData, this.session);
}
if (!this.isPopulatingObject || this.shouldKeepValues) {
this.valuesArray[index] = value;
}
}
return value;
} else {
return this.valuesArray[index];
}
} else {
return super.get(key);
}
}
/**
* INTERNAL:
* Retrieve the value for the field. If missing DatabaseRow.noEntry is returned.
* PERF: This method is a clone of get() for performance.
*/
@Override
public Object getIndicatingNoEntry(DatabaseField key) {
if (this.fieldsArray != null) {
// Optimize check.
int index = key.index;
if ((index < 0) || (index >= this.size)) {
index = 0;
}
DatabaseField field = this.fieldsArray[index];
if ((field != key) && !field.equals(key)) {
index = -1;
for (int fieldIndex = 0; fieldIndex < this.size; fieldIndex++) {
field = this.fieldsArray[fieldIndex];
if ((field == key) || field.equals(key)) {
// PERF: If the fields index was not set, then set it.
if (key.index == -1) {
key.setIndex(fieldIndex);
}
index = fieldIndex;
break;
}
}
if (index < 0) {
return null;
}
}
if (this.resultSet != null) {
Object value = this.valuesArray[index];
if (value != null) {
if (!this.isPopulatingObject) {
this.isPopulatingObject = true;
}
if (!this.shouldKeepValues) {
this.valuesArray[index] = null;
}
} else {
if (this.shouldUseOptimization) {
try {
Class fieldType = field.getType();
if (fieldType == ClassConstants.STRING) {
if(platform.shouldUseGetSetNString()){
value = resultSet.getNString(index + 1);
}else {
value = resultSet.getString(index + 1);
}
} else if (fieldType == ClassConstants.LONG) {
value = resultSet.getLong(index + 1);
} else if (fieldType == ClassConstants.INTEGER) {
value = resultSet.getInt(index + 1);
} else {
value = this.accessor.getObject(this.resultSet, field, this.metaData, index + 1, this.platform, this.optimizeData, this.session);
}
} catch (SQLException exception) {
DatabaseException commException = this.accessor.processExceptionForCommError(session, exception, null);
if (commException != null) {
throw commException;
}
throw DatabaseException.sqlException(exception, accessor, session, false);
} } else {
value = this.accessor.getObject(this.resultSet, field, this.metaData, index + 1, this.platform, this.optimizeData, this.session);
}
if (!this.isPopulatingObject || this.shouldKeepValues) {
this.valuesArray[index] = value;
}
}
return value;
} else {
return this.valuesArray[index];
}
} else {
return super.get(key);
}
}
protected Object getValueFromResultSet(int index, DatabaseField field) {
if (this.shouldUseOptimization) {
try {
Class fieldType = field.getType();
if (fieldType == ClassConstants.STRING) {
if(platform.shouldUseGetSetNString()){
return resultSet.getNString(index + 1);
}else {
return resultSet.getString(index + 1);
}
} else if (fieldType == ClassConstants.LONG) {
return resultSet.getLong(index + 1);
} else if (fieldType == ClassConstants.INTEGER) {
return resultSet.getInt(index + 1);
}
} catch (SQLException exception) {
DatabaseException commException = this.accessor.processExceptionForCommError(session, exception, null);
if (commException != null) {
throw commException;
}
throw DatabaseException.sqlException(exception, accessor, session, false);
}
}
return this.accessor.getObject(this.resultSet, field, this.metaData, index + 1, this.platform, this.optimizeData, this.session);
}
public void reset() {
if (this.isPopulatingObject) {
this.isPopulatingObject = false;
if (this.shouldKeepValues) {
int size = this.valuesArray.length;
for (int index = 0; index < size; index++) {
this.valuesArray[index] = null;
}
}
} else {
// TODO: this row hasn't been used to populate object, so values for all fields are null except for primary key fields and, possibly, version field.
int size = this.valuesArray.length;
for (int index = 0; index < size; index++) {
this.valuesArray[index] = null;
}
}
}
public boolean shouldKeepValues() {
return this.shouldKeepValues;
}
public void setShouldKeepValues(boolean shouldKeepValues) {
this.shouldKeepValues = shouldKeepValues;
}
public boolean shouldUseOptimization() {
return this.shouldUseOptimization;
}
public void setShouldUseOptimization(boolean shouldUseOptimization) {
this.shouldUseOptimization = shouldUseOptimization;
}
public boolean hasValues() {
return this.valuesArray[0] != null;
}
public boolean isPopulatingObject() {
return this.isPopulatingObject;
}
@Override
protected String toStringAditional() {
return (this.shouldKeepValues ? " shouldKeepValues" : "") + (shouldUseOptimization ? " shouldUseOptimization" : "") + (isPopulatingObject ? " isPopulatingObject" : "");
}
@Override
public void setSopObject(Object sopObject) {
this.sopObject = sopObject;
// sopObject is set - the row is used to populate object
this.isPopulatingObject = true;
}
}
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