litesoft
@ 151
litesoft / trunk / Java / core / Server / src / org / litesoft / configuration / ConfigAccessorLocator.java
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// This Source Code is in the Public Domain per: http://litesoft.org/License.txt package org.litesoft.configuration; import java.io.*; import java.util.*; import org.litesoft.util.*; public class ConfigAccessorLocator implements ConfigDataAccessorFactory { public static final String CURRENT_DIR = "."; private String mRelativeConfigFilePath; private ConfigAccessorFactory mConfigAccessorFactory; private List<String> mAdditionalSearchPaths = new ArrayList<String>(); public ConfigAccessorLocator( String pRelativeConfigFilePath, ConfigAccessorFactory pConfigAccessorFactory ) { mRelativeConfigFilePath = Utils.assertNotNullNotEmpty( "RelativeConfigFilePath", pRelativeConfigFilePath ).replace( '\\', '/' ); Utils.assertNotNull( "ConfigAccessorFactory", mConfigAccessorFactory = pConfigAccessorFactory ); } @SuppressWarnings({"UnusedDeclaration"}) public ConfigAccessorLocator( String pRelativeConfigFilePath, ConfigAccessorFactory pConfigAccessorFactory, String... pAdditionalSearchPaths ) { this( pRelativeConfigFilePath, pConfigAccessorFactory ); addSearchPaths( pAdditionalSearchPaths ); } @SuppressWarnings({"UnusedDeclaration"}) public ConfigAccessorLocator( String pRelativeConfigFilePath, ConfigAccessorFactory pConfigAccessorFactory, List<String> pAdditionalSearchPaths ) { this( pRelativeConfigFilePath, pConfigAccessorFactory ); addSearchPaths( pAdditionalSearchPaths ); } private void addSearchPath( String pSearchPath ) { if ( pSearchPath != null ) { mAdditionalSearchPaths.add( pSearchPath.trim() ); } } public ConfigAccessorLocator addSearchPaths( List<String> pSearchPaths ) { if ( pSearchPaths != null ) { for ( String path : pSearchPaths ) { addSearchPath( path ); } } return this; } public ConfigAccessorLocator addSearchPaths( String... pSearchPaths ) { if ( pSearchPaths != null ) { for ( String path : pSearchPaths ) { addSearchPath( path ); } } return this; } @SuppressWarnings({"UnusedDeclaration"}) public String[] getAdditionalSearchPaths() { return mAdditionalSearchPaths.toArray( new String[mAdditionalSearchPaths.size()] ); } @Override public ConfigDataAccessor createConfigDataAccessor() { ConfigDataAccessor found = searchForConfigFileInFileSystem(); if ( found != null ) { return found; } InputStream is = getClass().getResourceAsStream( mRelativeConfigFilePath ); if ( is != null ) { try { ConfigDataAccessor configAccessor = mConfigAccessorFactory.create( null, // mRelativeConfigFilePath, // is ); System.out.println( "Loaded configuration as 'resource': " + mRelativeConfigFilePath ); return configAccessor; } catch ( IOException e ) { throw newErrorMessage( "load as 'resource': " + mRelativeConfigFilePath, e ); } finally { Utils.dispose( is ); } } throw newErrorMessage( "locate", null ); } private ConfigDataAccessor searchForConfigFileInFileSystem() { ConfigDataAccessor found = searchForConfigFileAtSystemPropertyUserHomeDir(); if ( found != null ) { return found; } for ( String zSearchPath : mAdditionalSearchPaths ) { if ( null != (found = searchForConfigFileAt( zSearchPath )) ) { return found; } } return searchForConfigFileAtSystemPropertyCurrentDir(); } protected ConfigDataAccessor searchForConfigFileAtSystemPropertyUserHomeDir() { return searchForConfigFileAtSystemProperty( "user.home" ); } protected ConfigDataAccessor searchForConfigFileAtSystemPropertyCurrentDir() { return searchForConfigFileAtSystemProperty( "user.dir" ); } private RuntimeException newErrorMessage( String pWhy, Throwable pCause ) { return new IllegalStateException( "Unable to " + pWhy + " '" + mRelativeConfigFilePath + "'," + " looked in the following Hierarchies: " + mCheckedForFileAt, pCause ); } private List<String> mCheckedForFileAt = new ArrayList<String>(); private ConfigDataAccessor searchForConfigFileAtSystemProperty( String pSystemPropertyReference ) { String value; try { value = System.getProperty( pSystemPropertyReference ); } catch ( SecurityException e ) { return null; // OK so we won't look there! } return searchForConfigFileAt( value ); } private ConfigDataAccessor searchForConfigFileAt( String pParentPath ) { if ( pParentPath == null ) { return null; } if ( pParentPath.length() == 0 ) { try { pParentPath = new File( CURRENT_DIR ).getCanonicalPath(); } catch ( IOException e ) { return null; // Now going to fail, but if it does, then ignore } } String fileRelativeFrom = locateFile( new File( pParentPath ), mRelativeConfigFilePath ); if ( fileRelativeFrom == null ) { return null; } File fileAt = new File( fileRelativeFrom, mRelativeConfigFilePath ); InputStream is; try { is = new FileInputStream( fileAt ); } catch ( IOException e ) { throw newErrorMessage( "open (" + fileAt.getAbsolutePath() + ")", e ); } try { ConfigDataAccessor configAccessor = mConfigAccessorFactory.create( fileRelativeFrom, mRelativeConfigFilePath, is ); System.out.println( "Loaded configuration from: " + fileAt.getAbsolutePath() ); return configAccessor; } catch ( IOException e ) { throw newErrorMessage( "load (" + fileAt.getAbsolutePath() + ")", e ); } finally { Utils.dispose( is ); } } private String locateFile( File pParentPath, String pFile ) { if ( !shouldLookAt( pParentPath ) ) { return null; } return huntForFile( pParentPath, pFile ); } protected String huntForFile( File pParentPath, String pFile ) { String found; while ( null == (found = checkForFileAt( pParentPath, pFile )) ) { pParentPath = pParentPath.getParentFile(); if ( (pParentPath == null) || !shouldLookAt( pParentPath ) ) { return null; } } return found; } protected String checkForFileAt( File pParentPath, String pFile ) { return new File( pParentPath, pFile ).isFile() ? pParentPath.getAbsolutePath() : null; } private boolean shouldLookAt( File pDir ) { String dirPath = pDir.getAbsolutePath().replace( '\\', '/' ); if ( dirPath.endsWith( "/." ) ) { dirPath = dirPath.substring( 0, dirPath.length() - 2 ); } if ( mCheckedForFileAt.contains( dirPath ) ) { return false; } mCheckedForFileAt.add( dirPath ); return true; } } |