package org.apache.maven.settings.building;
   
   /*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  
  import java.io.File;
  import java.io.IOException;
  import java.io.StringReader;
  import java.io.StringWriter;
  import java.util.Collections;
  import java.util.List;
  import java.util.Map;
  
  import org.apache.maven.settings.Settings;
  import org.apache.maven.settings.TrackableBase;
  import org.apache.maven.settings.io.SettingsParseException;
  import org.apache.maven.settings.io.SettingsReader;
  import org.apache.maven.settings.io.SettingsWriter;
  import org.apache.maven.settings.merge.MavenSettingsMerger;
  import org.apache.maven.settings.validation.SettingsValidator;
  import org.codehaus.plexus.component.annotations.Component;
  import org.codehaus.plexus.component.annotations.Requirement;
  import org.codehaus.plexus.interpolation.EnvarBasedValueSource;
  import org.codehaus.plexus.interpolation.InterpolationException;
  import org.codehaus.plexus.interpolation.InterpolationPostProcessor;
  import org.codehaus.plexus.interpolation.PropertiesBasedValueSource;
  import org.codehaus.plexus.interpolation.RegexBasedInterpolator;
  
  /**
   * Builds the effective settings from a user settings file and/or a global settings file.
   * 
   * @author Benjamin Bentmann
   */
  @Component( role = SettingsBuilder.class )
  public class DefaultSettingsBuilder
      implements SettingsBuilder
  {
  
      @Requirement
      private SettingsReader settingsReader;
  
      @Requirement
      private SettingsWriter settingsWriter;
  
      @Requirement
      private SettingsValidator settingsValidator;
  
      private MavenSettingsMerger settingsMerger = new MavenSettingsMerger();
  
      public DefaultSettingsBuilder setSettingsReader( SettingsReader settingsReader )
      {
          this.settingsReader = settingsReader;
          return this;
      }
  
      public DefaultSettingsBuilder setSettingsWriter( SettingsWriter settingsWriter )
      {
          this.settingsWriter = settingsWriter;
          return this;
      }
  
      public DefaultSettingsBuilder setSettingsValidator( SettingsValidator settingsValidator )
      {
          this.settingsValidator = settingsValidator;
          return this;
      }
  
      public SettingsBuildingResult build( SettingsBuildingRequest request )
          throws SettingsBuildingException
      {
          DefaultSettingsProblemCollector problems = new DefaultSettingsProblemCollector( null );
  
          SettingsSource globalSettingsSource =
              getSettingsSource( request.getGlobalSettingsFile(), request.getGlobalSettingsSource() );
          Settings globalSettings = readSettings( globalSettingsSource, request, problems );
  
          SettingsSource userSettingsSource =
              getSettingsSource( request.getUserSettingsFile(), request.getUserSettingsSource() );
          Settings userSettings = readSettings( userSettingsSource, request, problems );
  
          settingsMerger.merge( userSettings, globalSettings, TrackableBase.GLOBAL_LEVEL );
  
          problems.setSource( "" );
 
         userSettings = interpolate( userSettings, request, problems );
 
         // for the special case of a drive-relative Windows path, make sure it's absolute to save plugins from trouble
         String localRepository = userSettings.getLocalRepository();
         if ( localRepository != null && localRepository.length() > 0 )
         {
             File file = new File( localRepository );
             if ( !file.isAbsolute() && file.getPath().startsWith( File.separator ) )
             {
                 userSettings.setLocalRepository( file.getAbsolutePath() );
             }
         }
 
         if ( hasErrors( problems.getProblems() ) )
         {
             throw new SettingsBuildingException( problems.getProblems() );
         }
 
         return new DefaultSettingsBuildingResult( userSettings, problems.getProblems() );
     }
 
     private boolean hasErrors( List<SettingsProblem> problems )
     {
         if ( problems != null )
         {
             for ( SettingsProblem problem : problems )
             {
                 if ( SettingsProblem.Severity.ERROR.compareTo( problem.getSeverity() ) >= 0 )
                 {
                     return true;
                 }
             }
         }
 
         return false;
     }
 
     private SettingsSource getSettingsSource( File settingsFile, SettingsSource settingsSource )
     {
         if ( settingsSource != null )
         {
             return settingsSource;
         }
         else if ( settingsFile != null && settingsFile.exists() )
         {
             return new FileSettingsSource( settingsFile );
         }
         return null;
     }
 
     private Settings readSettings( SettingsSource settingsSource, SettingsBuildingRequest request,
                                    DefaultSettingsProblemCollector problems )
     {
         if ( settingsSource == null )
         {
             return new Settings();
         }
 
         problems.setSource( settingsSource.getLocation() );
 
         Settings settings;
 
         try
         {
             Map<String, ?> options = Collections.singletonMap( SettingsReader.IS_STRICT, Boolean.TRUE );
 
             try
             {
                 settings = settingsReader.read( settingsSource.getInputStream(), options );
             }
             catch ( SettingsParseException e )
             {
                 options = Collections.singletonMap( SettingsReader.IS_STRICT, Boolean.FALSE );
 
                 settings = settingsReader.read( settingsSource.getInputStream(), options );
 
                 problems.add( SettingsProblem.Severity.WARNING, e.getMessage(), e.getLineNumber(), e.getColumnNumber(),
                               e );
             }
         }
         catch ( SettingsParseException e )
         {
             problems.add( SettingsProblem.Severity.FATAL, "Non-parseable settings " + settingsSource.getLocation() + ": "
                 + e.getMessage(), e.getLineNumber(), e.getColumnNumber(), e );
             return new Settings();
         }
         catch ( IOException e )
         {
             problems.add( SettingsProblem.Severity.FATAL, "Non-readable settings " + settingsSource.getLocation() + ": "
                 + e.getMessage(), -1, -1, e );
             return new Settings();
         }
 
         settingsValidator.validate( settings, problems );
 
         return settings;
     }
 
     private Settings interpolate( Settings settings, SettingsBuildingRequest request, SettingsProblemCollector problems )
     {
         StringWriter writer = new StringWriter( 1024 * 4 );
 
         try
         {
             settingsWriter.write( writer, null, settings );
         }
         catch ( IOException e )
         {
             throw new IllegalStateException( "Failed to serialize settings to memory", e );
         }
 
         String serializedSettings = writer.toString();
 
         RegexBasedInterpolator interpolator = new RegexBasedInterpolator();
 
         interpolator.addValueSource( new PropertiesBasedValueSource( request.getUserProperties() ) );
 
         interpolator.addValueSource( new PropertiesBasedValueSource( request.getSystemProperties() ) );
 
         try
         {
             interpolator.addValueSource( new EnvarBasedValueSource() );
         }
         catch ( IOException e )
         {
             problems.add( SettingsProblem.Severity.WARNING, "Failed to use environment variables for interpolation: "
                 + e.getMessage(), -1, -1, e );
         }
 
         interpolator.addPostProcessor( new InterpolationPostProcessor()
         {
             public Object execute( String expression, Object value )
             {
                 if ( value != null )
                 {
                     // we're going to parse this back in as XML so we need to escape XML markup
                     value = value.toString().replace( "&", "&amp;" ).replace( "<", "&lt;" ).replace( ">", "&gt;" );
                     return value;
                 }
                 return null;
             }
         } );
 
         try
         {
             serializedSettings = interpolator.interpolate( serializedSettings, "settings" );
         }
         catch ( InterpolationException e )
         {
             problems.add( SettingsProblem.Severity.ERROR, "Failed to interpolate settings: " + e.getMessage(), -1, -1,
                           e );
 
             return settings;
         }
 
         Settings result;
         try
         {
             Map<String, ?> options = Collections.singletonMap( SettingsReader.IS_STRICT, Boolean.FALSE );
             result = settingsReader.read( new StringReader( serializedSettings ), options );
         }
         catch ( IOException e )
         {
             problems.add( SettingsProblem.Severity.ERROR, "Failed to interpolate settings: " + e.getMessage(), -1, -1,
                           e );
             return settings;
         }
 
         return result;
     }
 
 }