litesoft
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// This Source Code is in the Public Domain per: http://litesoft.org/License.txt package org.litesoft.core.util; import java.util.*; import org.litesoft.core.typeutils.*; /** * SimpleMessage is similar to MessageFormat in that it utilizes {} to identify the substitution positions * and index of the parameters. It differs in that nothing but simple indexes are supported and if no substitutions * are indicated, then "{0} " is added to the front, and all other parameters are added to the end.<p> * <p/> * The following example creates a <code>MessageFormat</code> instance that * can be used repeatedly: * <blockquote><pre> * int fileCount = 1273; * String diskName = "MyDisk"; * Object[] testArgs = {new Long(fileCount), diskName}; * <p/> * MessageFormat form = new MessageFormat( * "The disk \"{1}\" contains {0} file(s)."); */ public class SimpleMessage { public static final char START_SUB = '{'; public static final char END_SUB = '}'; public static String format( String pPattern, Object... pParameters ) { if ( pPattern == null ) { pPattern = "?"; } AbstractFormatter zFormatter; synchronized ( sCached ) { if ( null == (zFormatter = sCached.get( pPattern )) ) { sCached.put( pPattern, zFormatter = createFormatter( pPattern ) ); } } return zFormatter.format( pParameters ); } private static final Map<String, AbstractFormatter> sCached = new HashMap<String, AbstractFormatter>(); private static String getParam( Object[] pParameters, int pIndex ) { return (pParameters != null) && (0 <= pIndex) && (pIndex < pParameters.length) ? Objects.toString( pParameters[pIndex] ) : ""; } private static interface AbstractFormatter { abstract public String format( Object[] pParameters ); } private static class NoSubsFormatter implements AbstractFormatter { private String mPattern; protected NoSubsFormatter( String pPattern ) { mPattern = pPattern; } @Override public String format( Object[] pParameters ) { if ( Objects.isNullOrEmpty( pParameters ) ) { return mPattern; } StringBuilder sb = new StringBuilder(); sb.append( getParam( pParameters, 0 ) ).append( ' ' ).append( mPattern ); for ( int i = 1; i < pParameters.length; i++ ) { sb.append( ' ' ).append( getParam( pParameters, i ) ); } return sb.toString(); } } private static class PartsFormatter implements AbstractFormatter { private Part[] mParts; protected PartsFormatter( Part[] pParts ) { mParts = pParts; } @Override public String format( Object[] pParameters ) { StringBuilder sb = new StringBuilder(); for ( Part part : mParts ) { sb.append( part.get( pParameters ) ); } return sb.toString(); } } private interface Part { String get( Object[] pParameters ); } private static class StringPart implements Part { private String mString; public StringPart( String pString ) { mString = pString; } @Override public String get( Object[] pParameters ) { return mString; } } private static class ParamPart implements Part { private int mIndex; public ParamPart( int pIndex ) { mIndex = pIndex; } @Override public String get( Object[] pParameters ) { return getParam( pParameters, mIndex ); } } private static final Map<String, StringPart> sStringParts = new HashMap<String, StringPart>(); private static final Map<Integer, ParamPart> sParamParts = new HashMap<Integer, ParamPart>(); private static StringPart getStringPart( String pString ) { StringPart rv = sStringParts.get( pString ); if ( rv == null ) { sStringParts.put( pString, rv = new StringPart( pString ) ); } return rv; } private static ParamPart parse( String pIndex ) { try { Integer index = Integer.valueOf( pIndex ); ParamPart rv = sParamParts.get( index ); if ( rv == null ) { sParamParts.put( index, rv = new ParamPart( index ) ); } return rv; } catch ( NumberFormatException e ) { return null; } } private static AbstractFormatter createFormatter( String pPattern ) { int sAT = pPattern.indexOf( START_SUB ); int eAT = pPattern.indexOf( END_SUB, sAT + 1 ); if ( (sAT == -1) || (eAT == -1) ) { return new NoSubsFormatter( pPattern ); } List<Part> zParts = new ArrayList<Part>(); StringBuilder sb = new StringBuilder(); do { sb.append( pPattern.substring( 0, sAT ) ); String index = pPattern.substring( sAT + 1, eAT ); ParamPart part = parse( index ); if ( part == null ) { sb.append( START_SUB ).append( index ).append( END_SUB ); } else { zParts.add( getStringPart( sb.toString() ) ); sb = new StringBuilder(); zParts.add( part ); } pPattern = pPattern.substring( eAT + 1 ); sAT = pPattern.indexOf( START_SUB ); eAT = pPattern.indexOf( END_SUB, sAT + 1 ); } while ( (sAT != -1) && (eAT != -1) ); String restOfString = sb.append( pPattern ).toString(); if ( zParts.isEmpty() ) { return new NoSubsFormatter( restOfString ); } zParts.add( getStringPart( restOfString ) ); return new PartsFormatter( zParts.toArray( new Part[zParts.size()] ) ); } } |