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package oracle.toplink.essentials.internal.helper;
import java.io.*;
import java.util.Vector;
import java.util.Collection;
import oracle.toplink.essentials.internal.databaseaccess.*;
/**
* INTERNAL:
* <p> <b>Purpose</b>:
* Define a fully qualified table name.<p>
* <b>Responsibilities</b>: <ul>
* <li> Allow specification of a qualifier to the table, i.e. creator or database.
* </ul>
*@see DatabaseField
*/
public class DatabaseTable implements Cloneable, Serializable {
protected String name;
protected String tableQualifier;
protected String qualifiedName;
protected Vector<String[]> uniqueConstraints; //Element is columnNames
/**
* Initialize the newly allocated instance of this class.
* By default their is no qualifier.
*/
public DatabaseTable() {
this("", "");
}
public DatabaseTable(String possiblyQualifiedName) {
setPossiblyQualifiedName(possiblyQualifiedName);
uniqueConstraints = new Vector<String[]>();
}
public DatabaseTable(String tableName, String qualifier) {
this.name = tableName;
this.tableQualifier = qualifier;
uniqueConstraints = new Vector<String[]>();
}
/**
* Add the unique constraint for the columns names. Used for DDL generation.
*/
public void addUniqueConstraints(String[] columnNames) {
uniqueConstraints.add(columnNames);
}
/**
* Return a shallow copy of the receiver.
* @return Object An Object must be returned or the signature of this method
* will conflict with the signature in Object.
*/
public Object clone() {
try {
return super.clone();
} catch (CloneNotSupportedException exception) {
}
return null;
}
/**
* Two tables are equal if their names and tables are equal,
* or their names are equal and one does not have a qualifier assigned.
* This allows an unqualified table to equal the same fully qualified one.
*/
public boolean equals(Object object) {
if (object instanceof DatabaseTable) {
return equals((DatabaseTable)object);
}
return false;
}
/**
* Two tables are equal if their names and tables are equal,
* or their names are equal and one does not have a qualifier assigned.
* This allows an unqualified table to equal the same fully qualified one.
*/
public boolean equals(DatabaseTable table) {
if (this == table) {
return true;
}
if (DatabasePlatform.shouldIgnoreCaseOnFieldComparisons()) {
if (getName().equalsIgnoreCase(table.getName())) {
if ((getTableQualifier().length() == 0) || (table.getTableQualifier().length() == 0) || (getTableQualifier().equalsIgnoreCase(table.getTableQualifier()))) {
return true;
}
}
} else {
if (getName().equals(table.getName())) {
if ((getTableQualifier().length() == 0) || (table.getTableQualifier().length() == 0) || (getTableQualifier().equals(table.getTableQualifier()))) {
return true;
}
}
}
return false;
}
/**
* Get method for table name.
*/
public String getName() {
return name;
}
public String getQualifiedName() {
if (qualifiedName == null) {
if (tableQualifier.equals("")) {
qualifiedName = getName();
} else {
qualifiedName = getTableQualifier() + "." + getName();
}
}
return qualifiedName;
}
public String getTableQualifier() {
return tableQualifier;
}
/**
* Return a vector of the unique constraints for this table.
* Used for DDL generation.
*/
public Vector<String[]> getUniqueConstraints() {
return uniqueConstraints;
}
/**
* Return the hashcode of the name, because it is fairly unqiue.
*/
public int hashCode() {
return getName().hashCode();
}
/**
* Determine whether the receiver has any identification information.
* Return true if the name or qualifier of the receiver are nonempty.
*/
public boolean hasName() {
if ((getName().length() == 0) && (getTableQualifier().length() == 0)) {
return false;
}
return true;
}
/**
* INTERNAL:
* Is this decorated / has an AS OF (some past time) clause.
* <b>Example:</b>
* SELECT ... FROM EMPLOYEE AS OF TIMESTAMP (exp) t0 ...
*/
public boolean isDecorated() {
return false;
}
protected void resetQualifiedName() {
this.qualifiedName = null;
}
/**
* This method will set the table name regardless if the name has
* a qualifier. Used when aliasing table names.
*
* @param name
*/
public void setName(String name) {
this.name = name;
resetQualifiedName();
}
/**
* Used to map the project xml. Anytime a string name is read from the
* project xml, we must check if it is fully qualified and split the
* actual name from the qualifier.
*
* @param possiblyQualifiedName
*/
public void setPossiblyQualifiedName(String possiblyQualifiedName) {
resetQualifiedName();
int index = possiblyQualifiedName.lastIndexOf('.');
if (index == -1) {
this.name = possiblyQualifiedName;
this.tableQualifier = "";
} else {
this.name = possiblyQualifiedName.substring(index + 1, possiblyQualifiedName.length());
this.tableQualifier = possiblyQualifiedName.substring(0, index);
}
}
public void setTableQualifier(String qualifier) {
this.tableQualifier = qualifier;
resetQualifiedName();
}
public String toString() {
return "DatabaseTable(" + getQualifiedName() + ")";
}
}
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