litesoft
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// This Source Code is in the Public Domain per: http://litesoft.org/License.txt package org.litesoft.util.tempdirimageaccessor; import java.io.*; import org.litesoft.core.typeutils.*; import org.litesoft.core.util.*; import org.litesoft.util.*; public class FileNameParts { private static final char SEP = '-'; private static final String WIDTH_INDICATOR = "w"; private static final String HEIGHT_INDICATOR = "h"; private String mPrefix; private String mEncodedExtraInfo; private Integer mImageWidth; private Integer mImageHeight; private String mUniquingPortion; private String mImageEncoding; private static final char EXT_SEP = '.'; public String createFileNamePrefix() { StringBuilder sb = new StringBuilder(); sb.append( mPrefix ).append( SEP ).append( mEncodedExtraInfo ); if ( mImageWidth != null ) { sb.append( SEP ).append( WIDTH_INDICATOR ).append( mImageWidth ); } if ( mImageHeight != null ) { sb.append( SEP ).append( HEIGHT_INDICATOR ).append( mImageHeight ); } return sb.append( SEP ).toString(); // UniquingPortion // . // ImageEncoding } public static String delineateUniquingPortion( String pUniquingPortion ) { return "" + SEP + pUniquingPortion + EXT_SEP; } public String createFileNameExt() { return "" + EXT_SEP + mImageEncoding; } public static FileNameParts createFromFileName( String pOpaqueStoredImageKey_ie_FileName ) { //noinspection UnnecessaryLocalVariable FileNameParts rv = new FileNameParts(); int at = pOpaqueStoredImageKey_ie_FileName.indexOf( EXT_SEP ); if ( at == -1 ) { throw new IllegalStateException( "Bad File Name, No '.' in: " + pOpaqueStoredImageKey_ie_FileName ); } rv.setImageEncoding( pOpaqueStoredImageKey_ie_FileName.substring( at + 1 ) ); String[] parts = Strings.parseChar( pOpaqueStoredImageKey_ie_FileName.substring( 0, at ), SEP ); for ( int i = 2; i < parts.length; i++ ) { if ( parts[i].length() == 0 ) { throw new IllegalStateException( "Bad File Name, Empty Part[i]: " + pOpaqueStoredImageKey_ie_FileName ); } } // part[0] = Prefix // part[1] = EncodedExtraInfo // part[?2?] = wWidth // part[?2/3?] = hHeight // part[2/3/4] = UniquingPortion switch ( parts.length ) { case 0: case 1: case 2: throw new IllegalStateException( "Bad File Name, Insufficient Parts: " + pOpaqueStoredImageKey_ie_FileName ); case 3: rv.first2parts( parts ); rv.mUniquingPortion = parts[2]; break; case 4: rv.first2parts( parts ); if ( parts[2].startsWith( WIDTH_INDICATOR ) ) { rv.setImageWidth( parseDimension( "Width", WIDTH_INDICATOR, WIDTH_INDICATOR, parts, 2, pOpaqueStoredImageKey_ie_FileName ) ); } else { rv.setImageHeight( parseDimension( "Height", WIDTH_INDICATOR + "/" + HEIGHT_INDICATOR, HEIGHT_INDICATOR, parts, 2, pOpaqueStoredImageKey_ie_FileName ) ); } rv.mUniquingPortion = parts[3]; break; case 5: rv.first2parts( parts ); rv.setImageWidth( parseDimension( "Width", WIDTH_INDICATOR, WIDTH_INDICATOR, parts, 2, pOpaqueStoredImageKey_ie_FileName ) ); rv.setImageHeight( parseDimension( "Height", HEIGHT_INDICATOR, HEIGHT_INDICATOR, parts, 3, pOpaqueStoredImageKey_ie_FileName ) ); rv.mUniquingPortion = parts[4]; break; default: throw new IllegalStateException( "Bad File Name, too Many Parts: " + pOpaqueStoredImageKey_ie_FileName ); } return rv; } private static Integer parseDimension( String pWhat, String pMustStartWith, String pExpectedIndicator, String[] pParts, int i, String pFullFileName ) { String part = pParts[i]; if ( !part.startsWith( pExpectedIndicator ) ) { throw new IllegalStateException( "Bad File Name, Part[" + i + "] did not start with " + pMustStartWith + ": " + pFullFileName ); } part = part.substring( 1 ).trim(); if ( part.length() != 0 ) { try { return Integer.parseInt( part ); } catch ( NumberFormatException e ) { // fall thru } } throw new IllegalStateException( "Bad File Name, Part[" + i + "] was not a valid " + pWhat + ": " + pFullFileName ); } private void first2parts( String[] pParts ) { setPrefix( pParts[0] ); mEncodedExtraInfo = pParts[1]; } private FileNameParts() { } private FileNameParts( String pPrefix, String pExtraInfo, Integer pImageWidth, Integer pImageHeight, String pImageEncoding ) { setPrefix( pPrefix ); mEncodedExtraInfo = encodeExtraInfo( pExtraInfo ); setImageWidth( pImageWidth ); setImageHeight( pImageHeight ); setImageEncoding( pImageEncoding ); } public FileNameParts( String pPrefix, String pExtraInfo, int pImageWidth, int pImageHeight, String pImageEncoding ) { this( pPrefix, pExtraInfo, Integer.valueOf( pImageWidth ), Integer.valueOf( pImageHeight ), pImageEncoding ); } public FileNameParts( String pPrefix, String pExtraInfo ) { this( pPrefix, pExtraInfo, null, null, null ); } public String getPrefix() { return mPrefix; } /** * @param pPrefix Wil be used as Front of file name * * @throws IllegalArgumentException if not updateable or not AlphaNumeric (and Underscore) or less than 3 characters long */ private void setPrefix( String pPrefix ) { String str = Strings.noEmpty( pPrefix ); if ( str != null ) { if ( str.length() < 3 ) { throw new IllegalArgumentException( "Prefix '" + str + "', Not at least 3 characters long" ); } for ( int i = 0; i < str.length(); i++ ) { char c = str.charAt( i ); if ( (c != '_') && !Characters.is7BitAsciiAlpha( c ) && !Characters.isNumeric( c ) ) { throw new IllegalArgumentException( "Prefix: '" + c + "' Not a 7 Bit Ascii AlphaNumeric or underscore at: " + i ); } } } mPrefix = str; } public String getEncodedExtraInfo() { return mEncodedExtraInfo; } public Integer getImageWidth() { return mImageWidth; } /** * @param pWidth non-negative * * @throws IllegalArgumentException if negative or not updateable */ private void setImageWidth( Integer pWidth ) throws IllegalArgumentException { mImageWidth = chkDimensionalSize( "Width", pWidth ); } public Integer getImageHeight() { return mImageHeight; } /** * @param pHeight non-negative * * @throws IllegalArgumentException if negative or not updateable */ private void setImageHeight( Integer pHeight ) throws IllegalArgumentException { mImageHeight = chkDimensionalSize( "Height", pHeight ); } public String getUniquingPortion() { return mUniquingPortion; } public String getImageEncoding() { return mImageEncoding; } /** * @param pImageEncoding All Alphas * * @throws IllegalArgumentException if not null and not all Alphas or not updateable */ private void setImageEncoding( String pImageEncoding ) throws IllegalArgumentException { String str = Strings.noEmpty( pImageEncoding ); if ( str != null ) { Utils.assertAll7BitAsciiAlpha( "ImageEncoding", str = str.toUpperCase() ); } mImageEncoding = str; } public File createFileAt( File pDirectory ) throws IllegalStateException, IOException { required( "Prefix", getPrefix() ); required( "ImageWidth", getImageWidth() ); required( "ImageHeight", getImageHeight() ); required( "ImageEncoding", getImageEncoding() ); String zFileNamePrefix = createFileNamePrefix(); String zFileNameExt = createFileNameExt(); if ( (zFileNamePrefix.length() + zFileNameExt.length()) > 200 ) { throw new IOException( "Prefix & ExtraInfo too long" ); } File zFile = File.createTempFile( zFileNamePrefix, zFileNameExt, pDirectory ); String zRealFileName = zFile.getName(); if ( !zRealFileName.startsWith( zFileNamePrefix ) || !zRealFileName.endsWith( zFileNameExt ) ) { zFile.delete(); throw new IOException( "Temp File Name unacceptable: " + zRealFileName ); } mUniquingPortion = zRealFileName.substring( zFileNamePrefix.length(), zRealFileName.length() - zFileNameExt.length() ); return zFile; } private static void required( String pWhat, Object pValue ) { if ( pValue == null ) { throw new IllegalStateException( pWhat + " is required" ); } } // Kinda (drop leading '0' from UTF-16 characters) Hex encode the passed string private static String encodeExtraInfo( String pExtraInfo ) { if ( null == (pExtraInfo = Strings.noEmpty( pExtraInfo )) ) { return ""; } StringBuilder sb = new StringBuilder( pExtraInfo.length() * 2 ); for ( int i = 0; i < pExtraInfo.length(); i++ ) { char[] zChars = Hex.to4Chars( pExtraInfo.charAt( i ) ); int si = 0; while ( (si < 3) && (zChars[si] == '0') ) { si++; } while ( si <= 3 ) { sb.append( zChars[si++] ); } } return sb.toString(); } private static Integer chkDimensionalSize( String pWhat, Integer pValue ) { if ( (pValue != null) && (pValue < 0) ) { throw new IllegalArgumentException( pWhat + " can NOT be negative" ); } return pValue; } } |