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From mcconn...@apache.org
Subject cvs commit: avalon/repository/main/src/java/org/apache/avalon/repository/main DefaultBuilder.java
Date Sat, 13 Dec 2003 18:21:57 GMT
mcconnell    2003/12/13 10:21:57

  Modified:    repository/main/src/java/org/apache/avalon/repository/main
                        DefaultBuilder.java
  Log:
  Add generic support for the location of a current implementation artifact specification
using a supplied properties filename and key.
  
  Revision  Changes    Path
  1.8       +87 -1     avalon/repository/main/src/java/org/apache/avalon/repository/main/DefaultBuilder.java
  
  Index: DefaultBuilder.java
  ===================================================================
  RCS file: /home/cvs/avalon/repository/main/src/java/org/apache/avalon/repository/main/DefaultBuilder.java,v
  retrieving revision 1.7
  retrieving revision 1.8
  diff -u -r1.7 -r1.8
  --- DefaultBuilder.java	9 Dec 2003 09:19:10 -0000	1.7
  +++ DefaultBuilder.java	13 Dec 2003 18:21:57 -0000	1.8
  @@ -51,8 +51,12 @@
   package org.apache.avalon.repository.main;
   
   import java.io.File;
  +import java.io.InputStream;
  +import java.io.FileInputStream;
  +import java.io.IOException;
   import java.text.ParseException;
   import java.util.Map;
  +import java.util.Properties;
   import java.util.StringTokenizer;
   import java.util.ArrayList;
   
  @@ -86,6 +90,65 @@
   public class DefaultBuilder extends AbstractBuilder implements Builder
   {
       //-----------------------------------------------------------
  +    // static
  +    //-----------------------------------------------------------
  +
  +    private static final File USER = 
  +      new File( System.getProperty( "user.home" ) );
  +
  +   /**
  +    * Resolve the default implementation taking into account 
  +    * local and home properties, and application defaults.
  +    * @param classloader the embedding classloader
  +    * @param base the base directory
  +    * @param resource a properties filename
  +    * @param key a property key containing an artifact specification
  +    * @return the artifact reference
  +    */
  +    protected static Artifact createImplementationArtifact( 
  +      ClassLoader classloader, File base, String resource, String key ) throws Exception
  +    {
  +        String spec = 
  +          getLocalProperties( USER, resource ).getProperty( key );
  +        if( null == spec )
  +        {
  +            spec = 
  +              getLocalProperties( base, resource ).getProperty( key );
  +            if( null == spec )
  +            {
  +                Properties properties = new Properties();
  +                InputStream input = classloader.getResourceAsStream( resource );
  +                if( input == null ) 
  +                {
  +                    final String error = 
  +                      "Missing resource: [" + resource + "]";
  +                    throw new Error( error );
  +                }
  +                properties.load( input );
  +                spec = properties.getProperty( key );
  +                if( spec == null ) 
  +                {
  +                    final String error = 
  +                      "Missing property: [" + key + "] in resource: [" + resource + "]";
  +                    throw new Error( error );
  +                }
  +            }
  +        }
  +        return Artifact.createArtifact( spec );
  +    }
  +
  +    private static Properties getLocalProperties( 
  +      File dir, String filename ) throws IOException
  +    {
  +        Properties properties = new Properties();
  +        if( null == dir ) return properties;
  +        File file = new File( dir, filename );
  +        if( !file.exists() ) return properties;
  +        properties.load( new FileInputStream( file ) );
  +        return properties;
  +    }
  +
  +    //-----------------------------------------------------------
       // immutable state
       //-----------------------------------------------------------
   
  @@ -119,6 +182,29 @@
       //-----------------------------------------------------------
       // constructors
       //-----------------------------------------------------------
  +
  +   /**
  +    * Creates a DefaultBuilder for a specific target application.
  +    * 
  +    * @param context the initial repository context
  +    * @param classloader the parent classloader
  +    * @param resource the filename of a property file normall located in
  +    *   the inital working directory or user home directory
  +    * @param key a property key containing the implemention artifact specification
  +    * @exception Exception if a builder creation error occurs
  +    */
  +    public DefaultBuilder( InitialContext context, ClassLoader classloader, String resource,
String key )
  +        throws Exception
  +    {
  +        this( 
  +          context, 
  +          classloader,
  +          createImplementationArtifact( 
  +            classloader,
  +            context.getInitialWorkingDirectory(), 
  +            resource, 
  +            key ) );
  +    }
   
      /**
       * Creates a DefaultBuilder for a specific target application.
  
  
  

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