/*******************************************************************************
* Copyright (c) 1998, 2013 Oracle and/or its affiliates. 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
* tware - added handling of database delimiters
* 03/24/2011-2.3 Guy Pelletier
* - 337323: Multi-tenant with shared schema support (part 1)
* 25/05/2012-2.4 Guy Pelletier
* - 354678: Temp classloader is still being used during metadata processing
******************************************************************************/
package org.eclipse.persistence.internal.helper;
//javase imports
import java.io.Serializable;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import static java.lang.Integer.MIN_VALUE;
//EclipseLink imports
import org.eclipse.persistence.exceptions.ValidationException;
import org.eclipse.persistence.internal.databaseaccess.DatabasePlatform;
import org.eclipse.persistence.internal.databaseaccess.DatasourcePlatform;
import org.eclipse.persistence.internal.security.PrivilegedAccessHelper;
import org.eclipse.persistence.internal.security.PrivilegedClassForName;
/**
* INTERNAL:
* <p><b>Purpose</b>:
* Define a fully qualified field name.<p>
* <b>Responsibilities</b>: <ul>
* <li> Know its name and its table.
* </ul>
* @see DatabaseTable
*/
public class DatabaseField implements Cloneable, Serializable {
/** Variables used for generating DDL **/
protected int scale;
protected int length;
protected int precision;
protected boolean isUnique;
protected boolean isNullable;
protected boolean isUpdatable;
protected boolean isInsertable;
protected boolean isCreatable;
protected boolean isPrimaryKey;
protected String columnDefinition;
/** Column name of the field. */
protected String name;
/** PERF: Cache fully qualified table.field-name. */
protected String qualifiedName;
/** Fields table (encapsulates name + creator). */
protected DatabaseTable table;
/**
* Respective Java type desired for the field's value, used to optimize performance and for binding.
* PERF: Allow direct variable access from getObject.
*/
public transient Class type;
public String typeName; // shadow variable - string name of above Class type variable
/**
* Respective JDBC type of the field's value.
* This overrides the class type, which the JDBC type is normally computed from.
* PERF: Allow direct variable access from getObject.
*/
public int sqlType;
/**
* Store normal index of field in result set to optimize performance.
* PERF: Allow direct variable access from getIndicatingNoEntry.
*/
public int index;
protected boolean useDelimiters = false;
/**
* If this is set, it will be used in determining equality (unless delimiters are used) and the hashcode.
* @see getNameForComparisons
*/
private String nameForComparisons;
/**
* setting to true will cause getNameForComparisons to lazy initialize nameForComparisons using
* the value from getName().toUpperCase().
*/
private boolean useUpperCaseForComparisons = false;
/**
* used to represent the value when it has not being defined
*/
public static final int NULL_SQL_TYPE = MIN_VALUE;
public DatabaseField() {
this("", new DatabaseTable());
}
public DatabaseField(String qualifiedName) {
this(qualifiedName, null, null);
}
public DatabaseField(String qualifiedName, String startDelimiter, String endDelimiter) {
this.index = -1;
this.sqlType = NULL_SQL_TYPE;
int index = qualifiedName.lastIndexOf('.');
if (index == -1) {
setName(qualifiedName, startDelimiter, endDelimiter);
this.table = new DatabaseTable();
} else {
setName(qualifiedName.substring(index + 1, qualifiedName.length()), startDelimiter, endDelimiter);
this.table = new DatabaseTable(qualifiedName.substring(0, index), startDelimiter, endDelimiter);
}
initDDLFields();
}
public DatabaseField(String fieldName, String tableName) {
this(fieldName, new DatabaseTable(tableName));
}
public DatabaseField(String fieldName, DatabaseTable databaseTable) {
this(fieldName, databaseTable, null, null);
}
public DatabaseField(String fieldName, DatabaseTable databaseTable, String startDelimiter, String endDelimiter) {
this.index = -1;
this.sqlType = NULL_SQL_TYPE;
setName(fieldName, startDelimiter, endDelimiter);
this.table = databaseTable;
initDDLFields();
}
/**
* Inits the DDL generation fields with our defaults. Note: we used to
* initialize the length to the JPA default of 255 but since this default
* value should only apply for string fields we set it to 0 to indicate
* that it was not specified and rely on the default (255) to come from
* individual platforms.
*/
public void initDDLFields() {
scale = 0;
length = 0;
precision = 0;
isUnique = false;
isNullable = true;
isUpdatable = true;
isInsertable = true;
isCreatable = true;
isPrimaryKey = false;
columnDefinition = "";
}
/**
* The table is not cloned because it is treated as an automatic value.
*/
public DatabaseField clone() {
try {
return (DatabaseField)super.clone();
} catch (CloneNotSupportedException exception) {
throw new InternalError(exception.getMessage());
}
}
/*
* INTERNAL:
* Convert all the class-name-based settings in this mapping to actual
* class-based settings. This method is implemented by subclasses as
* necessary.
* @param classLoader
*/
public void convertClassNamesToClasses(ClassLoader classLoader) {
if (type == null && typeName != null) {
try {
if (PrivilegedAccessHelper.shouldUsePrivilegedAccess()){
try {
type = (Class) AccessController.doPrivileged(new PrivilegedClassForName(typeName, true, classLoader));
} catch (PrivilegedActionException e) {
throw ValidationException.classNotFoundWhileConvertingClassNames(typeName, e.getException());
}
} else {
type = org.eclipse.persistence.internal.security.PrivilegedAccessHelper.getClassForName(typeName, true, classLoader);
}
} catch (Exception exception) {
throw ValidationException.classNotFoundWhileConvertingClassNames(typeName, exception);
}
}
}
/**
* Determine whether the receiver is equal to a DatabaseField.
* Return true if the receiver and field have the same name and table.
* Also return true if the table of the receiver or field are unspecified,
* ie. have no name.
*/
public boolean equals(Object object) {
if (!(object instanceof DatabaseField)) {
return false;
}
return equals((DatabaseField)object);
}
/**
* Determine whether the receiver is equal to a DatabaseField.
* Return true if the receiver and field have the same name and table.
* Also return true if the table of the receiver or field are unspecified,
* ie. have no name.
*/
public boolean equals(DatabaseField field) {
if (this == field) {
return true;
}
if (field != null) {
// PERF: Optimize common cases first.
// PERF: Use direct variable access.
if (getQualifiedName().equals(field.getQualifiedName())) {
return true;
}
//preserve old behavior if static shouldIgnoreCaseOnFieldComparisons is set
if (DatabasePlatform.shouldIgnoreCaseOnFieldComparisons()) {
if (this.name.equalsIgnoreCase(field.name)) {
//getTableName will cause NPE if there isn't a table. use hasTableName instead
if ((!hasTableName()) || (!field.hasTableName())) {
return true;
}
return (this.table.equals(field.table));
}
} else {
String ourNameToCompare;
String fieldNameToCompare;
if (field.shouldUseDelimiters() || shouldUseDelimiters()) {
ourNameToCompare = this.name;
fieldNameToCompare = field.name;
} else {
ourNameToCompare = getNameForComparisons();
fieldNameToCompare = field.getNameForComparisons();
}
if (this.name.equals(field.name) || ourNameToCompare.equals(fieldNameToCompare)) {
//getTableName will cause NPE if there isn't a table. use hasTableName instead
if ((!hasTableName()) || (!field.hasTableName())) {
return true;
}
return (this.table.equals(field.table));
}
}
}
return false;
}
/**
/**
* Get the SQL fragment that is used when generating the DDL for the column.
*/
public String getColumnDefinition() {
return this.columnDefinition;
}
/**
* Return the expected index that this field will occur in the result set
* row. This is used to optimize performance of database row field lookups.
*/
public int getIndex() {
return index;
}
/**
* Used to specify the column length when generating DDL.
*/
public int getLength() {
return this.length;
}
/**
* Return the unqualified name of the field.
*/
public String getName() {
return name;
}
/**
* Returns this fields name with database delimiters if useDelimiters is true.
* This method should be called any time the field name is requested for writing SQL.
*/
public String getNameDelimited(DatasourcePlatform platform) {
if (this.useDelimiters){
return platform.getStartDelimiter() + this.name + platform.getEndDelimiter();
}
return this.name;
}
/**
* Returns the precision for a decimal column when generating DDL.
*/
public int getPrecision() {
return this.precision;
}
public String getQualifiedName(){
if (this.qualifiedName == null) {
if (hasTableName()) {
this.qualifiedName = this.table.getQualifiedName() + "." + getName();
} else {
this.qualifiedName = getName();
}
}
return this.qualifiedName;
}
/**
* Return the qualified name of the field.
* PERF: Cache the qualified name.
*/
public String getQualifiedNameDelimited(DatasourcePlatform platform) {
if (hasTableName()) {
return this.table.getQualifiedNameDelimited(platform) + "." + getNameDelimited(platform);
} else {
return getNameDelimited(platform);
}
}
/**
* Returns the scale for a decimal column when generating DDL.
*/
public int getScale() {
return this.scale;
}
public DatabaseTable getTable() {
return table;
}
public String getTableName() {
return getTable().getName();
}
public void setTableName(String tableName) {
setTable(new DatabaseTable(tableName));
}
public Class getType() {
return type;
}
public String getTypeName() {
return typeName;
}
public void setTypeName(String typeName) {
this.typeName = typeName;
}
/**
* Return the JDBC type that corresponds to the field.
* The JDBC type is normally determined from the class type,
* but this allows it to be overridden for types that do not match directly to a Java type,
* such as MONEY or ARRAY, STRUCT, XMLTYPE, etc.
* This can be used for binding or stored procedure usage.
*/
public int getSqlType() {
return sqlType;
}
/**
* Return the hashcode of the name, because it is fairly unique.
*/
public int hashCode() {
return getNameForComparisons().hashCode();
}
public boolean hasTableName() {
if (this.table == null) {
return false;
}
if (this.table.getName() == null) {
return false;
}
return !(this.table.getName().equals(""));
}
/**
* PUBLIC:
* Return if this is an ObjectRelationalDatabaseField.
*/
public boolean isObjectRelationalDatabaseField(){
return false;
}
/**
* Used to specify whether the column should be included in SQL UPDATE
* statements.
*/
public boolean isInsertable() {
return this.isInsertable;
}
/**
* Used for generating DDL. Returns true if the database column is
* nullable.
*/
public boolean isNullable() {
return this.isNullable;
}
/**
* Used to specify whether the column should be included in the primary
* on the database table.
*/
public boolean isPrimaryKey() {
return this.isPrimaryKey;
}
/**
* Used for generating DDL. Returns true if the field is a unique key.
*/
public boolean isUnique() {
return this.isUnique;
}
/**
* Returns true is this database field should be read only.
*/
public boolean isReadOnly() {
return (! isUpdatable && ! isInsertable);
}
/**
* Returns whether the column should be included in SQL INSERT
* statements.
*/
public boolean isUpdatable() {
return this.isUpdatable;
}
/**
* Reset the field's name and table from the qualified name.
*/
public void resetQualifiedName(String qualifiedName) {
setIndex(-1);
int index = qualifiedName.lastIndexOf('.');
if (index == -1) {
setName(qualifiedName);
getTable().setName("");
getTable().setTableQualifier("");
} else {
setName(qualifiedName.substring(index + 1, qualifiedName.length()));
getTable().setPossiblyQualifiedName(qualifiedName.substring(0, index));
}
}
/**
* Set the SQL fragment that is used when generating the DDL for the column.
*/
public void setColumnDefinition(String columnDefinition) {
this.columnDefinition = columnDefinition;
}
/**
* Set the expected index that this field will occur in the result set row.
* This is used to optimize performance of database row field lookups.
*/
public void setIndex(int index) {
this.index = index;
}
/**
* Used to specify whether the column should be included in SQL UPDATE
* statements.
*/
public void setInsertable(boolean isInsertable) {
this.isInsertable = isInsertable;
}
/**
* Used to specify the column length when generating DDL.
*/
public void setLength(int length) {
this.length = length;
}
/**
* Set the unqualified name of the field.
*/
public void setName(String name) {
setName(name, null, null);
}
/**
* Set the unqualified name of the field.
*
* If the name contains database delimiters, they will be stripped and a flag will be set to have them
* added when the DatabaseField is written to SQL
*/
public void setName(String name, DatasourcePlatform platform){
setName(name, platform.getStartDelimiter(), platform.getEndDelimiter());
}
/**
* Set the unqualified name of the field.
*
* If the name contains database delimiters, they will be stripped and a flag will be set to have them
* added when the DatabaseField is written to SQL
*/
public void setName(String name, String startDelimiter, String endDelimiter) {
if ((startDelimiter != null) && (endDelimiter != null) && !startDelimiter.equals("")&& !endDelimiter.equals("") && name.startsWith(startDelimiter) && name.endsWith(endDelimiter)){
this.name = name.substring(startDelimiter.length(), name.length() - endDelimiter.length());
this.useDelimiters = true;
} else {
this.name = name;
}
this.nameForComparisons = null;
this.qualifiedName = null;
}
/**
* Used for generating DDL. Set to true if the database column is
* nullable.
*/
public void setNullable(boolean isNullable) {
this.isNullable = isNullable;
}
/**
* Used to specify the precision for a decimal column when generating DDL.
*/
public void setPrecision(int precision) {
this.precision = precision;
}
/**
* Used to specify whether the column should be included in primary key
* on the database table.
*/
public void setPrimaryKey(boolean isPrimaryKey) {
this.isPrimaryKey = isPrimaryKey;
}
/**
* Used to specify the scale for a decimal column when generating DDL.
*/
public void setScale(int scale) {
this.scale = scale;
}
/**
* Set the JDBC type that corresponds to the field.
* The JDBC type is normally determined from the class type,
* but this allows it to be overridden for types that do not match directly
* to a Java type, such as MONEY or ARRAY, STRUCT, XMLTYPE, etc.
* This can be used for binding or stored procedure usage.
*/
public void setSqlType(int sqlType) {
this.sqlType = sqlType;
}
/**
* Set the table for the field.
*/
public void setTable(DatabaseTable table) {
this.table = table;
this.qualifiedName = null;
}
/**
* Set the Java class type that corresponds to the field.
* The JDBC type is determined from the class type,
* this is used to optimize performance, and for binding.
*/
public void setType(Class type) {
this.type = type;
if (this.type != null && typeName == null) {
typeName = this.type.getName();
}
}
/**
* Used for generating DDL. Set to true if the field is a unique key.
*/
public void setUnique(boolean isUnique) {
this.isUnique = isUnique;
}
/**
* Used to specify whether the column should be included in SQL INSERT
* statements.
*/
public void setUpdatable(boolean isUpdatable) {
this.isUpdatable = isUpdatable;
}
public String toString() {
return this.getQualifiedName();
}
public void setUseDelimiters(boolean useDelimiters) {
this.useDelimiters = useDelimiters;
}
public boolean shouldUseDelimiters() {
return this.useDelimiters;
}
/**
* INTERNAL:
* Sets the useUpperCaseForComparisons flag which is used to force using the uppercase version of the field's
* name to determine field equality and its hashcode, but will still use the original name when writing/printing
* operations. If this isn't a change, it is ignored, otherwise it sets the nameForComparisons to null.
*/
public void useUpperCaseForComparisons(boolean useUpperCaseForComparisons){
if (this.useUpperCaseForComparisons != useUpperCaseForComparisons){
this.useUpperCaseForComparisons = useUpperCaseForComparisons;
this.setNameForComparisons(null);
}
}
public boolean getUseUpperCaseForComparisons(){
return this.useUpperCaseForComparisons;
}
/**
* INTERNAL:
* sets the string to be used for equality checking and determining the hashcode of this field.
* This will overwrite the useUpperCaseForEquality setting with the passed in string.
*/
public void setNameForComparisons(String name){
this.nameForComparisons = name;
}
public boolean isCreatable() {
return isCreatable;
}
public void setCreatable(boolean isCreatable) {
this.isCreatable = isCreatable;
}
/**
* INTERNAL:
* gets the string used for comparisons and in determining the hashcode.
*/
public String getNameForComparisons(){
if (this.nameForComparisons == null) {
if ((!this.useUpperCaseForComparisons) || (this.name == null)) {
this.nameForComparisons = this.name;
} else {
this.nameForComparisons = this.name.toUpperCase();
}
}
return this.nameForComparisons;
}
}