org.apache.xml.resolver
Class CatalogEntry

java.lang.Object
  |
  +--org.apache.xml.resolver.CatalogEntry

public class CatalogEntry
extends java.lang.Object

Represents a Catalog entry.

Instances of this class represent individual entries in a Catalog.

Each catalog entry has a unique name and is associated with an arbitrary number of arguments (all strings). For example, the TR9401 catalog entry "PUBLIC" has two arguments, a public identifier and a system identifier. Each entry has a unique numeric type, assigned automatically when the entry type is created.

The number and type of catalog entries is maintained statically. Catalog classes, or their subclasses, can add new entry types, but all Catalog objects share the same global pool of types.

Initially there are no valid entries.

Version:
1.0
Author:
Norman Walsh Norman.Walsh@Sun.COM
See Also:
Catalog

Field Summary
protected  java.util.Vector args
          The arguments associated with this entry
protected static java.util.Vector entryArgs
          The entryTypes vector maps catalog entry types to the number of arguments they're required to have.
protected  int entryType
          The entry type of this entry
protected static java.util.Hashtable entryTypes
          The entryTypes vector maps catalog entry names (e.g., 'BASE' or 'SYSTEM') to their type (1, 2, etc.).
protected static int nextEntry
          The nextEntry is the ordinal number of the next entry type.
 
Constructor Summary
CatalogEntry()
          Null constructor; something for subclasses to call.
CatalogEntry(int type, java.util.Vector args)
          Construct a catalog entry of the specified type.
CatalogEntry(java.lang.String name, java.util.Vector args)
          Construct a catalog entry of the specified type.
 
Method Summary
static int addEntryType(java.lang.String name, int numArgs)
          Adds a new catalog entry type.
 java.lang.String getEntryArg(int argNum)
          Get an entry argument.
static int getEntryArgCount(int type)
          Find out how many arguments an entry is required to have.
static int getEntryArgCount(java.lang.String name)
          Find out how many arguments an entry is required to have.
 int getEntryType()
          Get the entry type.
static int getEntryType(java.lang.String name)
          Lookup an entry type
 void setEntryArg(int argNum, java.lang.String newspec)
          Set an entry argument.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

nextEntry

protected static int nextEntry
The nextEntry is the ordinal number of the next entry type.

entryTypes

protected static java.util.Hashtable entryTypes
The entryTypes vector maps catalog entry names (e.g., 'BASE' or 'SYSTEM') to their type (1, 2, etc.). Names are case sensitive.

entryArgs

protected static java.util.Vector entryArgs
The entryTypes vector maps catalog entry types to the number of arguments they're required to have.

entryType

protected int entryType
The entry type of this entry

args

protected java.util.Vector args
The arguments associated with this entry
Constructor Detail

CatalogEntry

public CatalogEntry()
Null constructor; something for subclasses to call.

CatalogEntry

public CatalogEntry(java.lang.String name,
                    java.util.Vector args)
             throws CatalogException
Construct a catalog entry of the specified type.
Parameters:
name - The name of the entry type
args - A String Vector of arguments
Throws:
InvalidCatalogEntryTypeException - if no such entry type exists.
InvalidCatalogEntryException - if the wrong number of arguments is passed.

CatalogEntry

public CatalogEntry(int type,
                    java.util.Vector args)
             throws CatalogException
Construct a catalog entry of the specified type.
Parameters:
type - The entry type
args - A String Vector of arguments
Throws:
InvalidCatalogEntryTypeException - if no such entry type exists.
InvalidCatalogEntryException - if the wrong number of arguments is passed.
Method Detail

addEntryType

public static int addEntryType(java.lang.String name,
                               int numArgs)
Adds a new catalog entry type.
Parameters:
name - The name of the catalog entry type. This must be unique among all types and is case-sensitive. (Adding a duplicate name effectively replaces the old type with the new type.)
numArgs - The number of arguments that this entry type is required to have. There is no provision for variable numbers of arguments.
Returns:
The type for the new entry.

getEntryType

public static int getEntryType(java.lang.String name)
                        throws CatalogException
Lookup an entry type
Parameters:
name - The name of the catalog entry type.
Returns:
The type of the catalog entry with the specified name.
Throws:
InvalidCatalogEntryTypeException - if no entry has the specified name.

getEntryArgCount

public static int getEntryArgCount(java.lang.String name)
                            throws CatalogException
Find out how many arguments an entry is required to have.
Parameters:
name - The name of the catalog entry type.
Returns:
The number of arguments that entry type is required to have.
Throws:
InvalidCatalogEntryTypeException - if no entry has the specified name.

getEntryArgCount

public static int getEntryArgCount(int type)
                            throws CatalogException
Find out how many arguments an entry is required to have.
Parameters:
type - A valid catalog entry type.
Returns:
The number of arguments that entry type is required to have.
Throws:
InvalidCatalogEntryTypeException - if the type is invalid.

getEntryType

public int getEntryType()
Get the entry type.
Returns:
The entry type of the CatalogEntry

getEntryArg

public java.lang.String getEntryArg(int argNum)
Get an entry argument.
Parameters:
argNum - The argument number (arguments are numbered from 0).
Returns:
The specified argument or null if an invalid argNum is provided.

setEntryArg

public void setEntryArg(int argNum,
                        java.lang.String newspec)
                 throws java.lang.ArrayIndexOutOfBoundsException
Set an entry argument.

Catalogs sometimes need to adjust the catlog entry parameters, for example to make a relative URI absolute with respect to the current base URI. But in general, this function should only be called shortly after object creation to do some sort of cleanup. Catalog entries should not mutate over time.

Parameters:
argNum - The argument number (arguments are numbered from 0).
Throws:
java.lang.ArrayIndexOutOfBoundsException - if an invalid argument number is provided.


Copyright 2001-2006 Apache Software Foundation. All Rights Reserved.