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package oracle.toplink.essentials.internal.helper;
import java.io.*;
import oracle.toplink.essentials.internal.databaseaccess.*;
/**
* INTERNAL:
* Purpose:
* Define a fully qualified field name.
* Responsibilities:
* - Know its name and its table.
*
* @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 String columnDefinition;
/** Column name of the field. */
protected String name;
/** Fields table (encapsulates name + creator). */
protected DatabaseTable table;
/** Respective Java type desired for the field's value, used to optimize performance and for binding. */
public transient Class type;
/**
* Respective JDBC type of the field's value.
* This overrides the class type, which the JDBC type is normally computed from.
*/
public int sqlType;
/** Store normal index of field in result set to optimize performance. */
protected int index;
public DatabaseField() {
this("", new DatabaseTable());
}
public DatabaseField(String qualifiedName) {
this.index = -1;
this.sqlType = -1;
int index = qualifiedName.lastIndexOf('.');
if (index == -1) {
this.name = qualifiedName;
this.table = new DatabaseTable();
} else {
this.name = qualifiedName.substring(index + 1, qualifiedName.length());
this.table = new DatabaseTable(qualifiedName.substring(0, index));
}
initDDLFields();
}
public DatabaseField(String fieldName, String tableName) {
this(fieldName, new DatabaseTable(tableName));
}
public DatabaseField(String fieldName, DatabaseTable databaseTable) {
this.index = -1;
this.sqlType = -1;
this.name = fieldName;
this.table = databaseTable;
initDDLFields();
}
/**
* Inits the DDL generation fields. Currently equivalent to the defaults
* from the EJB 3.0 spec.
*/
public void initDDLFields() {
scale = 0;
length = 255;
precision = 0;
isUnique = false;
isNullable = true;
isUpdatable = true;
isInsertable = true;
columnDefinition = "";
}
/**
* The table is not cloned because it is treated as an automic value.
*/
public Object clone() {
try {
return super.clone();
} catch (CloneNotSupportedException exception) {
}
return null;
}
/**
* 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 unspecfied,
* ie. have no name.
*/
public boolean equals(DatabaseField field) {
if (this == field) {
return true;
}
if (field != null) {
if (DatabasePlatform.shouldIgnoreCaseOnFieldComparisons()) {
if (getName().equalsIgnoreCase(field.getName())) {
if ((getTableName().length() == 0) || (field.getTableName().length() == 0)) {
return true;
}
return (getTable().equals(field.getTable()));
}
} else {
if (getName().equals(field.getName())) {
if ((getTableName().length() == 0) || (field.getTableName().length() == 0)) {
return true;
}
return (getTable().equals(field.getTable()));
}
}
}
return false;
}
/**
* 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 unspecfied,
* ie. have no name.
*/
public boolean equals(Object object) {
if (!(object instanceof DatabaseField)) {
return false;
}
return equals((DatabaseField)object);
}
/**
* 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 the precision for a decimal column when generating DDL.
*/
public int getPrecision() {
return this.precision;
}
/**
* Return the qualified name of the field.
*/
public String getQualifiedName() {
if (hasTableName()) {
return getTable().getQualifiedName() + "." + getName();
} else {
return getName();
}
}
/**
* Returns the scale for a decimal column when generating DDL.
*/
public int getScale() {
return this.scale;
}
/**
* Return the JDBC type that coresponds to the field.
* The JDBC type is normally determined from the class type,
* but this allows it to be overriden 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;
}
/**
*
*/
public DatabaseTable getTable() {
return table;
}
/**
*
*/
public String getTableName() {
return getTable().getName();
}
/**
*
*/
public Class getType() {
return type;
}
/**
* Return the hashcode of the name, because it is fairly unqiue.
*/
public int hashCode() {
return getName().hashCode();
}
public boolean hasTableName() {
if (getTable() == null) {
return false;
}
if (getTable().getName() == null) {
return false;
}
return !(getTable().getName().equals(""));
}
/**
* Used to specify whether the column should be included in SQL UPDATE
* statements.
*/
public boolean isInsertable() {
return this.isInsertable;
}
/**
* Used for generatating DDL. Returns true if the database column is
* nullable.
*/
public boolean isNullable() {
return this.isNullable;
}
/**
* Used for generatating 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) {
this.name = name;
}
/**
* Used for generatating 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 the scale for a decimal column when generating DDL.
*/
public void setScale(int scale) {
this.scale = scale;
}
/**
* Set the JDBC type that coresponds to the field.
* The JDBC type is normally determined from the class type,
* but this allows it to be overriden 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;
}
/**
* Set the table name for this field.
*/
public void setTableName(String tableName) {
setTable(new DatabaseTable(tableName));
}
/**
* Set the Java class type that coresponds 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;
}
/**
* Used for generatating 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();
}
}