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package com.sun.appserv.management.util.jmx;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.Iterator;
import java.util.HashSet;
import java.util.Arrays;
import java.util.Collections;
import com.sun.appserv.management.util.misc.Output;
/**
Maps Attribute names to legal Java identifiers, so that they can
be exposed in a proxy with get/set routines
*/
public class AttributeNameMapperImpl implements AttributeNameMapper
{
final Map<String,String> mDerivedToOriginal;
final Map<String,String> mOriginalToDerived;
final Set<String> mAllNames;
final AttributeNameMangler mMangler;
private Output mDebug;
/**
Create a new instance which will map nothing by default.
*/
public
AttributeNameMapperImpl()
{
this( null, null);
}
public void
setDebugOutput( final Output debugOutput )
{
mDebug = debugOutput;
}
protected final void
debug(final Object o)
{
if ( mDebug != null )
{
mDebug.println( o );
}
}
public String
matchName(
final String derivedName,
final String[] candidates )
{
throw new UnsupportedOperationException( "matchName" );
}
/**
Create a new instance which will map (as necessary) the specified
Attribute names.
Same as AttributeNameMapperImpl( originalNames, new AttributeNameManglerImpl() )
*/
public
AttributeNameMapperImpl( final String[] originalNames )
{
this( originalNames, new AttributeNameManglerImpl( true, null ) );
}
/**
Create a new instance which will map (as necessary) the specified
Attribute names
*/
public
AttributeNameMapperImpl( final AttributeNameMangler mangler )
{
this( null, mangler );
}
/**
Create a new instance which will map (as necessary) the specified
Attribute names
*/
public
AttributeNameMapperImpl(
final String[] originalNames,
AttributeNameMangler mangler )
{
mDebug = null;
mDerivedToOriginal = new HashMap<String,String>();
mOriginalToDerived = new HashMap<String,String>();
mAllNames = new HashSet<String>();
mMangler = mangler == null ? new AttributeNameManglerImpl( true, null ) : mangler ;
if ( originalNames != null )
{
deriveAll( originalNames );
}
}
public void
deriveAll( final String[] originalNames )
{
final Set<String> notRequired = new HashSet<String>();
final Set<String> required = new HashSet<String>();
// first determine all names we (a) need to map and (b) don't need to map.
// we must not generate any mapped names that conflict with names
// that don't require mapping
for( final String originalName : originalNames )
{
if ( mOriginalToDerived.containsKey( originalName ) )
{
// continue; already present (explicit mapping)
}
else if ( ! requiresMapping( originalName ) )
{
notRequired.add( originalName );
}
else
{
required.add( originalName );
}
}
// add all ones that don't require mapping to map to themselves
for ( final String name : notRequired )
{
addMapping( name, name );
}
// now create a mapped name for each one that requires it.
for( final String originalName : required )
{
// our preferred derivation
final String preferredDerivation = originalToDerived( originalName );
// ensure that the derived name is not already used
String derivedName = preferredDerivation;
int id = 0;
while ( mAllNames.contains( derivedName ) ||
required.contains( derivedName ) )
{
derivedName = preferredDerivation + "_" + id;
++id;
}
addMapping( originalName, derivedName );
}
}
public boolean
derivedSameAsOriginal( String derivedName )
{
final String original = derivedToOriginal( derivedName );
final boolean theSame = original != null && derivedName.equals( original );
return( theSame );
}
public void
addMapping(
final String originalName,
final String derivedName )
{
mDerivedToOriginal.put( derivedName, originalName );
mOriginalToDerived.put( originalName, derivedName );
mAllNames.add( derivedName );
}
public void
dontMap( final String originalName )
{
debug( "dontMap: " + originalName );
addMapping( originalName, originalName );
}
public boolean
requiresMapping( final String originalName )
{
boolean requiresMapping = true ;
// must start with upper-case first-letter
final char firstChar = originalName.charAt( 0 );
if ( Character.isUpperCase( firstChar ) )
{
if ( Character.isJavaIdentifierStart( firstChar ) )
{
final int length = originalName.length();
requiresMapping = false;
for( int i = 1; i < length; ++i )
{
if ( ! Character.isJavaIdentifierPart( originalName.charAt( i ) ) )
{
requiresMapping = true;
break;
}
}
}
}
return( requiresMapping );
}
public String
originalToDerived( String originalName )
{
String derivedName = (String)mOriginalToDerived.get( originalName );
if ( derivedName == null )
{
derivedName = mMangler.mangleAttributeName( originalName );
}
return( derivedName );
}
public String
derivedToOriginal( String derivedName )
{
String original = (String)mDerivedToOriginal.get( derivedName );
if ( original == null )
{
original = derivedName;
}
return( original );
}
public Set<String>
getAttributeNames( )
{
return( mAllNames );
}
public String
toString()
{
final StringBuffer buf = new StringBuffer();
buf.append( "AttributeNameMapperImpl mappings:\n" );
final Iterator iter = getAttributeNames().iterator();
while ( iter.hasNext() )
{
final String name = (String)iter.next();
buf.append( name );
buf.append( " => " );
buf.append( derivedToOriginal( name ) + "\n" );
}
return( buf.toString() );
}
}
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