java.lang.Object
- com.sun.jdo.spi.persistence.generator.database.MappingPolicy

All Implemented Interfaces:

Cloneable
```
public class MappingPolicy
extends Object
implements Cloneable
```
Describes how Java classes and their fields are to be mapped to database tables and columns

Field Summary

Fields
Modifier and Type Field Description

static String USE_UNIQUE_TABLE_NAMES
Property name which indicates unique table names should be generated.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected Object`	`clone()`	Clones the vendor-specific policy for generator session.
`String`	`getColumnName(String className, String fieldName, String tableName)`	Returns the name of a column for a given field in a given class.
`String`	`getConstraintColumnName(String tableName, String columnName)`	Returns the name of the column which represents a foreign key in the named table.
`String`	`getConstraintName(String relName, String uniqueId)`	Returns the name of a constraint corresponding to the named relationship.
`com.sun.jdo.spi.persistence.generator.database.JDBCInfo`	`getJDBCInfo(String fieldName, String fieldType)`	Returns JDBC type information corresponding to the given field name and type.
`static String`	`getJdbcTypeName(int type)`	Provide the String name of a JDBC type, as per java.sql.Types.
`String`	`getJoinTableName(String className1, String className2)`	Returns the name of a join table which joins the tables that correspond to the two named classes.
`static MappingPolicy`	`getMappingPolicy(String databaseType)`	Returns a vendor-specifc MappingPolicy instance.
`static String`	`getOverrideForLength(String className, String fieldName)`	Provides a String that can be recognized as a policy to override the default length of a field.
`static String`	`getOverrideForNullability(String className, String fieldName)`	Provides a String that can be recognized as a policy to override the default nullability of a field.
`static String`	`getOverrideForPrecision(String className, String fieldName)`	Provides a String that can be recognized as a policy to override the default precision of a field.
`static String`	`getOverrideForScale(String className, String fieldName)`	Provides a String that can be recognized as a policy to override the default scale of a field.
`static String`	`getOverrideForType(String className, String fieldName)`	Provides a String that can be recognized as a policy to override the default type of a field.
`String`	`getPrimaryKeyConstraintName(String tableName)`	Returns the name of a PK constraint, unique-ified as required.
`String`	`getSQLTypeName(int jdbcType)`	Returns the String name of the SQL type for a given JDBC type.
`String`	`getTableName(String name, String uniqueName)`	Returns the name of a table for a given class, as per current policy.
`void`	`setUniqueTableName(boolean uniqueTableName)`	Sets whether or not unique table names should be generated.
`void`	`setUserPolicy(Properties props)`	Sets user-provided policy to that provided in the given properties.
`String`	`toString()`	Debug support.

Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Field Detail
  - USE_UNIQUE_TABLE_NAMES
```
public static final String USE_UNIQUE_TABLE_NAMES
```
    Property name which indicates unique table names should be generated.
    
    See Also:
    
    Constant Field Values
- Method Detail
  - getMappingPolicy
```
public static MappingPolicy getMappingPolicy(String databaseType)
                                      throws IOException
```
    Returns a vendor-specifc MappingPolicy instance. This method always returns a copy (clone) of the known MappingPolicy to allow for user-specific overrides.
    
    Parameters:
    
    databaseType - a database vendor name as a String.
    
    Returns:
    
    MappingPolicy instance corresponding to the provided database vendor name.
    
    Throws:
    
    IOException - if there are problems reading the vendor- specific mappinng policy file
  - clone
```
protected Object clone()
                throws CloneNotSupportedException
```
    Clones the vendor-specific policy for generator session. Replace the namespaces map in the clone, so that each instance has its own.
    
    Overrides:
    
    clone in class Object
    
    Returns:
    
    clone of this MappingPolicy
    
    Throws:
    
    CloneNotSupportedException - never thrown
  - setUserPolicy
```
public void setUserPolicy(Properties props)
```
    Sets user-provided policy to that provided in the given properties.
    
    Parameters:
    
    props - Properties which override built in defaults.
  - setUniqueTableName
```
public void setUniqueTableName(boolean uniqueTableName)
```
    Sets whether or not unique table names should be generated.
    
    Parameters:
    
    uniqueTableName - If true, tables names will be unique.
  - getSQLTypeName
```
public String getSQLTypeName(int jdbcType)
```
    Returns the String name of the SQL type for a given JDBC type.
    
    Parameters:
    
    jdbcType - One of the values from java.sql.Types.
    
    Returns:
    
    Name of SQL type corresponding to given jdbcType.
  - getJDBCInfo
```
public com.sun.jdo.spi.persistence.generator.database.JDBCInfo getJDBCInfo(String fieldName,
                                                                           String fieldType)
```
    Returns JDBC type information corresponding to the given field name and type. If fieldName is null or there is no fieldName - specific information already existing, the default for the given fieldType is returned. Otherwise, information specific to the fieldName is returned. Note: It is possible to have a field in a class have the same name as another class; this mechanism is not robust in that case:
    class Foo { } class MyFoo { Foo Foo = new Foo(); }
    We think this obfuscation unlikely to occur.
    Parameters:
    
    fieldName - Name of field for which information is needed. May be null, in which case only fieldType is used to determine returned information.
    
    fieldType - Name of a Java type.
    
    Returns:
    
    JDBCInfo representing the field or type.
  - getOverrideForLength
```
public static String getOverrideForLength(String className,
                                          String fieldName)
```
    Provides a String that can be recognized as a policy to override the default length of a field.
    
    Parameters:
    
    className - name of a class
    
    fieldName - name of a field in that class
    
    Returns:
    
    a String that can be used as the name of a length override for a field in a class.
  - getOverrideForNullability
```
public static String getOverrideForNullability(String className,
                                               String fieldName)
```
    Provides a String that can be recognized as a policy to override the default nullability of a field.
    
    Parameters:
    
    className - name of a class
    
    fieldName - name of a field in that class
    
    Returns:
    
    a String that can be used as the name of a nullability override for a field in a class.
  - getOverrideForPrecision
```
public static String getOverrideForPrecision(String className,
                                             String fieldName)
```
    Provides a String that can be recognized as a policy to override the default precision of a field.
    
    Parameters:
    
    className - name of a class
    
    fieldName - name of a field in that class
    
    Returns:
    
    a String that can be used as the name of a precision override for a field in a class.
  - getOverrideForScale
```
public static String getOverrideForScale(String className,
                                         String fieldName)
```
    Provides a String that can be recognized as a policy to override the default scale of a field.
    
    Parameters:
    
    className - name of a class
    
    fieldName - name of a field in that class
    
    Returns:
    
    a String that can be used as the name of a scale override for a field in a class.
  - getOverrideForType
```
public static String getOverrideForType(String className,
                                        String fieldName)
```
    Provides a String that can be recognized as a policy to override the default type of a field.
    
    Parameters:
    
    className - name of a class
    
    fieldName - name of a field in that class
    
    Returns:
    
    a String that can be used as the name of a type override for a field in a class.
  - getJdbcTypeName
```
public static String getJdbcTypeName(int type)
                              throws IllegalArgumentException
```
    Provide the String name of a JDBC type, as per java.sql.Types.
    
    Parameters:
    
    type - A value from java.sql.Types
    
    Returns:
    
    the String name corresponding to type
    
    Throws:
    
    IllegalArgumentException - if type is not recognized as being a valid member of java.sql.Types. Note that only a subset of the types in java.sql.Types are recognized.
  - getTableName
```
public String getTableName(String name,
                           String uniqueName)
```
    Returns the name of a table for a given class, as per current policy.
    
    Parameters:
    
    name - Basis for what the returned table should be named, for example the unqualified name of a class.
    
    uniqueName - Used if the current policy is to return a unique name. Client must provide a name that is unique to them.
    
    Returns:
    
    Name to be used for table. Regardless of the current policy, the name is different from other names returned during the current run of DatabaseGenerator.generate(com.sun.jdo.api.persistence.model.Model, java.util.List, com.sun.jdo.spi.persistence.generator.database.MappingPolicy, java.lang.String, java.lang.String, boolean).
  - getColumnName
```
public String getColumnName(String className,
                            String fieldName,
                            String tableName)
```
    Returns the name of a column for a given field in a given class. The column name will be unique within the table.
    
    Parameters:
    
    className - Name of the class containing the field.
    
    fieldName - Name of the field for which a column name is returned.
    
    tableName - Name of the table in which the column name is created.
    
    Returns:
    
    Name of a column that is unique within the named table.
  - getConstraintColumnName
```
public String getConstraintColumnName(String tableName,
                                      String columnName)
```
    Returns the name of the column which represents a foreign key in the named table.
    
    Parameters:
    
    tableName - Name of the table in which the FK column will be created.
    
    columnName - Name of PK column in referenced table.
    
    Returns:
    
    Name of the FK column in the named table.
  - getConstraintName
```
public String getConstraintName(String relName,
                                String uniqueId)
```
    Returns the name of a constraint corresponding to the named relationship.
    
    Parameters:
    
    relName - Name of a relationship.
    
    uniqueId - Id that can be appened to relName to distinguish it from other relNames in the database. Will be appended only if uniqueTableName is true.
    
    Returns:
    
    Name of a constraint.
  - getPrimaryKeyConstraintName
```
public String getPrimaryKeyConstraintName(String tableName)
```
    Returns the name of a PK constraint, unique-ified as required.
    
    Parameters:
    
    tableName - Name of a table on which a constraint is to be placed.
    
    Returns:
    
    Name of a constraint on named table.
  - getJoinTableName
```
public String getJoinTableName(String className1,
                               String className2)
```
    Returns the name of a join table which joins the tables that correspond to the two named classes.
    
    Parameters:
    
    className1 - Name of one class to join.
    
    className2 - Name of the other class to join.
    
    Returns:
    
    Name of a join table.
  - toString
```
public String toString()
```
    Debug support.
    
    Overrides:
    
    toString in class Object
    
    Returns:
    
    A description of this MappingPolicy in string form. Basically, all it's "interesting" values.

Class MappingPolicy

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

USE_UNIQUE_TABLE_NAMES

Method Detail

getMappingPolicy

clone

setUserPolicy

setUniqueTableName

getSQLTypeName

getJDBCInfo

getOverrideForLength

getOverrideForNullability

getOverrideForPrecision

getOverrideForScale

getOverrideForType

getJdbcTypeName

getTableName

getColumnName

getConstraintColumnName

getConstraintName

getPrimaryKeyConstraintName

getJoinTableName

toString