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package com.sun.enterprise.management.support;
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;
import com.sun.appserv.management.util.misc.GSetUtil;
import com.sun.appserv.management.util.misc.StringUtil;
import com.sun.appserv.management.util.misc.MapUtil;
import com.sun.appserv.management.util.misc.CollectionUtil;
/**
Maps Attribute names to legal Java identifiers, so that they can
be exposed in a proxy with get/set routines
*/
public class AMXAttributeNameMapperImpl implements AMXAttributeNameMapper
{
final Map<String,String> mDerivedToOriginal;
final Map<String,String> mOriginalToDerived;
final Set<String> mDerivedNames;
final Map<String,String> mUnmappedOriginals;
private Output mDebug;
/**
Create a new instance which will map nothing by default.
*/
public
AMXAttributeNameMapperImpl()
{
mDebug = null;
mDerivedToOriginal = new HashMap<String,String>();
mOriginalToDerived = new HashMap<String,String>();
mDerivedNames = new HashSet<String>();
mUnmappedOriginals = new HashMap<String,String>();
}
public void
setDebugOutput( final Output debugOutput )
{
mDebug = debugOutput;
}
protected final void
debug(final Object o)
{
if ( mDebug != null )
{
mDebug.println( o );
}
}
private static final char DASH_CHAR = '-';
private static final String DASH = "" + DASH_CHAR;
private String
stripDashes( final String name )
{
String result = name;
if ( name.indexOf( DASH ) >= 0 )
{
final StringBuilder builder = new StringBuilder();
final int length = name.length();
boolean upperNext = false;
for( int i = 0; i < length; ++i )
{
final char c = name.charAt( i );
if ( c == DASH_CHAR )
{
upperNext = true;
}
else
{
if ( upperNext )
{
builder.append( ("" + c ).toUpperCase() );
upperNext = false;
}
else
{
builder.append( c );
}
}
}
result = builder.toString();
}
return result;
}
private String
normalize( final String s )
{
return stripDashes( s ).toLowerCase();
}
private Map<String,String>
normalize( final Set<String> s )
{
final Map<String,String> result = new HashMap<String,String>();
for( final String name : s )
{
result.put( normalize( name ), name );
}
return result;
}
/**
Attempt to match the derived name to one of the candidates.
This facility is used when different runtime conditions
present different original names which must be mapped to the
same derived name.
<p>
If a name is matched it is added as a mapping and the
original name is returned, otherwise an exception is thrown.
*/
public String
matchName(
final String derivedName,
final String[] candidates )
{
String result = null;
final String existingOriginal = derivedToOriginal( derivedName );
if ( existingOriginal != null )
{
throw new IllegalArgumentException( "Already mapped: " +
derivedName + " => " + existingOriginal );
}
if ( mUnmappedOriginals.keySet().size() == 0 )
{
throw new IllegalArgumentException(
"There are no unmapped originals, existing mappings: " +
MapUtil.toString( mOriginalToDerived, ", " ) );
}
for( final String candidate : candidates )
{
final String candidateNormalized = normalize( candidate );
if ( mUnmappedOriginals.keySet().contains( candidateNormalized ) )
{
result = mUnmappedOriginals.get( candidateNormalized );
mUnmappedOriginals.remove( candidateNormalized );
addMapping( result, derivedName );
break;
}
}
if ( result == null )
{
final String msg = derivedName + " can't be matched to " +
StringUtil.toString( ", " , (Object[])candidates ) +
", unmapped originals: " +
CollectionUtil.toString( mUnmappedOriginals.values(), ", ") +
", mapped originals: {" + MapUtil.toString( mDerivedToOriginal, ", ") + "}";
throw new IllegalArgumentException( msg );
}
return result;
}
public String
matchName(
final String derivedName,
final String candidate1,
final String candidate2 )
{
return matchName( derivedName, new String[] { candidate1, candidate2 } );
}
public String
matchName(
final String derivedName,
final String candidate1 )
{
return matchName( derivedName, new String[] { candidate1 } );
}
/**
Attempt to match an original name with a derived one by performing
a case-insensitive comparison. It is OK if there are more derived
names than originals, or if there are more original names than
derived names.
@param derivedNames
@param originalNames
*/
public void
matchNames(
final String[] derivedNames,
final String[] originalNames )
{
final Set<String> originals = GSetUtil.newSet( originalNames );
final Set<String> deriveds = GSetUtil.newSet( derivedNames );
// first, eliminate identical names
for( final String original : originalNames )
{
if ( deriveds.contains( original ) )
{
//System.out.println( "IDENTITY: " + original );
addMapping( original, original );
originals.remove( original );
deriveds.remove( original );
}
}
// now we have remaining only those names that differ.
if ( originals.size() != 0 )
{
final Map<String,String> originalsMap = normalize( originals );
final Map<String,String> derivedsMap = normalize( deriveds );
for( final String originalLowerCase : originalsMap.keySet() )
{
final String original = originalsMap.get( originalLowerCase );
final String derived = derivedsMap.get( originalLowerCase );
if ( derived != null )
{
//System.out.println( "MATCHED: " + original + " => " + derived );
addMapping( original, derived );
}
else
{
// System.out.println( "NO MATCH: " + original );
mUnmappedOriginals.put( normalize( original ), original );
}
}
}
}
public Set<String>
getUnmappedOriginals()
{
Set<String> unmapped = Collections.emptySet();
if ( mUnmappedOriginals.keySet().size() != 0 )
{
unmapped = new HashSet<String>( mUnmappedOriginals.values());
}
return unmapped;
}
public void
addMapping(
final String originalName,
final String derivedName )
{
mDerivedToOriginal.put( derivedName, originalName );
mOriginalToDerived.put( originalName, derivedName );
if ( mUnmappedOriginals.keySet().contains( originalName ) )
{
mUnmappedOriginals.remove( originalName );
}
mDerivedNames.add( derivedName );
}
public void
dontMap( final String originalName )
{
addMapping( originalName, originalName );
}
public String
originalToDerived( final String originalName )
{
final String derivedName = mOriginalToDerived.get( originalName );
return( derivedName );
}
public String
derivedToOriginal( final String derivedName )
{
final String original = mDerivedToOriginal.get( derivedName );
return( original );
}
public Set<String>
getDerivedNames( )
{
return( mDerivedNames );
}
public String
toString()
{
final StringBuilder builder = new StringBuilder();
final String LINE_SEPARATOR = System.getProperty( "line.separator" );
for( final String name : getDerivedNames() )
{
builder.append( name );
builder.append( " => " );
builder.append( derivedToOriginal( name ) );
builder.append( LINE_SEPARATOR );
}
return( builder.toString() );
}
}
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