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From kayyag...@apache.org
Subject svn commit: r985376 [1/2] - in /directory/shared/branches/shared-codec-merge/ldap-schema-loader/src/main: java/org/apache/directory/shared/ldap/schema/loader/ldif/SingleLdifSchemaLoader.java resources/ resources/schema-all.ldif
Date Fri, 13 Aug 2010 21:45:43 GMT
Author: kayyagari
Date: Fri Aug 13 21:45:42 2010
New Revision: 985376

URL: http://svn.apache.org/viewvc?rev=985376&view=rev
Log:
o a new schema loader which loads the schema from a single monolithic ldif file
o ldif file containing all the schemas

Added:
    directory/shared/branches/shared-codec-merge/ldap-schema-loader/src/main/java/org/apache/directory/shared/ldap/schema/loader/ldif/SingleLdifSchemaLoader.java
    directory/shared/branches/shared-codec-merge/ldap-schema-loader/src/main/resources/
    directory/shared/branches/shared-codec-merge/ldap-schema-loader/src/main/resources/schema-all.ldif

Added: directory/shared/branches/shared-codec-merge/ldap-schema-loader/src/main/java/org/apache/directory/shared/ldap/schema/loader/ldif/SingleLdifSchemaLoader.java
URL: http://svn.apache.org/viewvc/directory/shared/branches/shared-codec-merge/ldap-schema-loader/src/main/java/org/apache/directory/shared/ldap/schema/loader/ldif/SingleLdifSchemaLoader.java?rev=985376&view=auto
==============================================================================
--- directory/shared/branches/shared-codec-merge/ldap-schema-loader/src/main/java/org/apache/directory/shared/ldap/schema/loader/ldif/SingleLdifSchemaLoader.java
(added)
+++ directory/shared/branches/shared-codec-merge/ldap-schema-loader/src/main/java/org/apache/directory/shared/ldap/schema/loader/ldif/SingleLdifSchemaLoader.java
Fri Aug 13 21:45:42 2010
@@ -0,0 +1,391 @@
+/*
+ *   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.
+ *
+ */
+
+package org.apache.directory.shared.ldap.schema.loader.ldif;
+
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.io.RandomAccessFile;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import org.apache.directory.shared.ldap.entry.Entry;
+import org.apache.directory.shared.ldap.exception.LdapException;
+import org.apache.directory.shared.ldap.ldif.LdifEntry;
+import org.apache.directory.shared.ldap.ldif.LdifReader;
+import org.apache.directory.shared.ldap.schema.registries.AbstractSchemaLoader;
+import org.apache.directory.shared.ldap.schema.registries.Schema;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+
+/**
+ * A schema loader based on a single monolithic ldif file containing all the schema partition
elements
+ * 
+ * Warn: this works, but not a super performer. Need to profile to see how much time the
regex matching
+ *       is taking (this is definitely the hotspot)
+ *       NOT DOCUMENTED atm
+ * 
+ * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
+ */
+public class SingleLdifSchemaLoader extends AbstractSchemaLoader
+{
+
+    private static final Logger LOG = LoggerFactory.getLogger( SingleLdifSchemaLoader.class
);
+
+    private RandomAccessFile schemaFile;
+
+    private Map<String, SchemaMarker> markerMap = new HashMap<String, SchemaMarker>();
+
+    private LdifReader ldifParser = new LdifReader();
+
+
+    public SingleLdifSchemaLoader()
+    {
+        try
+        {
+            URL resource = getClass().getClassLoader().getResource( "schema-all.ldif" );
+
+            LOG.debug( "URL of the all schema ldif file {}", resource );
+
+            File tempSchemaFile = File.createTempFile( "all-schema", ".ldif" );
+            LOG.debug( "storing the all schema file at {}", tempSchemaFile.getAbsolutePath()
);
+
+            InputStream in = resource.openStream();
+            OutputStream out = new FileOutputStream( tempSchemaFile );
+
+            byte[] buf = new byte[1024 * 1024];
+            while ( true )
+            {
+                int read = in.read( buf );
+                if ( read > 0 )
+                {
+                    out.write( buf, 0, read );
+                    continue;
+                }
+
+                break;
+            }
+
+            in.close();
+            out.close();
+
+            schemaFile = new RandomAccessFile( tempSchemaFile, "r" );
+
+            initializeSchemas();
+        }
+        catch ( Exception e )
+        {
+            throw new RuntimeException( e );
+        }
+    }
+
+
+    private void initializeSchemas() throws Exception
+    {
+        Pattern schemaStartPattern = Pattern.compile( "dn:\\s*cn=[a-z0-9-_]*\\s*,\\s*ou\\s*=\\s*schema"
);
+
+        String readLine = null;
+
+        SchemaMarker prevMarker = null;
+
+        while ( true )
+        {
+            int startLineOffset = ( int ) schemaFile.getFilePointer();
+
+            readLine = schemaFile.readLine();
+
+            if ( readLine == null )
+            {
+                break;
+            }
+
+            Matcher matcher = schemaStartPattern.matcher( readLine );
+            if ( matcher.matches() )
+            {
+                if ( prevMarker != null )
+                {
+                    prevMarker.setEnd( startLineOffset );
+                }
+
+                LdifEntry entry = readLdif( readLine );
+                Schema schema = getSchema( entry.getEntry() );
+                schemaMap.put( schema.getSchemaName(), schema );
+
+                SchemaMarker marker = new SchemaMarker( startLineOffset );
+                markerMap.put( schema.getSchemaName(), marker );
+                prevMarker = marker;
+            }
+        }
+
+        prevMarker.setEnd( ( int ) schemaFile.getFilePointer() );
+    }
+
+
+    private LdifEntry readLdif( String startLine ) throws Exception
+    {
+        StringBuilder sb = new StringBuilder( startLine );
+        sb.append( '\n' );
+
+        while ( true )
+        {
+            startLine = schemaFile.readLine();
+            if ( startLine.length() == 0 )
+            {
+                break;
+            }
+            else
+            {
+                sb.append( startLine );
+                sb.append( '\n' );
+            }
+        }
+
+        return ldifParser.parseLdif( sb.toString() ).get( 0 );
+    }
+
+
+    private List<Entry> getMatchingEntries( Pattern regex, int endOffset ) throws LdapException
+    {
+
+        try
+        {
+            List<Entry> entries = new ArrayList<Entry>();
+            String s = null;
+
+            // a perf improvement hack 
+            boolean matchesFound = false;
+
+            while ( ( s = schemaFile.readLine() ) != null )
+            {
+                Matcher matcher = regex.matcher( s );
+                if ( matcher.matches() )
+                {
+                    matchesFound = true;
+                    entries.add( readLdif( s ).getEntry() );
+                }
+                else if ( matchesFound )
+                {
+                    break;
+                }
+
+                if ( schemaFile.getFilePointer() >= endOffset )
+                {
+                    break;
+                }
+            }
+
+            return entries;
+        }
+        catch ( Exception e )
+        {
+            throw new LdapException( e.getMessage(), e );
+        }
+
+    }
+
+
+    private Pattern getPattern( Schema schema, String schemaObjectTypeRdn )
+    {
+        Pattern regex = Pattern.compile(
+            "dn:\\s*m-oid=[0-9\\.]*" + ",ou=" + schemaObjectTypeRdn + ",cn=" + schema.getSchemaName()
+ ",ou=schema",
+            Pattern.CASE_INSENSITIVE );
+
+        return regex;
+    }
+
+
+    private List<Entry> loadSchemaObjects( String schemaObjectType, Schema... schemas
) throws LdapException,
+        IOException
+    {
+        List<Entry> scObjTypeList = new ArrayList<Entry>();
+
+        if ( schemas == null )
+        {
+            return scObjTypeList;
+        }
+
+        for ( Schema schema : schemas )
+        {
+            SchemaMarker marker = markerMap.get( schema.getSchemaName() );
+            schemaFile.seek( marker.getStart() );
+
+            Pattern scObjEntryRegex = getPattern( schema, schemaObjectType );
+
+            scObjTypeList.addAll( getMatchingEntries( scObjEntryRegex, marker.getEnd() )
);
+        }
+
+        return scObjTypeList;
+    }
+
+
+    /**
+     * {@inheritDoc}
+     */
+    public List<Entry> loadAttributeTypes( Schema... schemas ) throws LdapException,
IOException
+    {
+
+        return loadSchemaObjects( "attributetypes", schemas );
+    }
+
+
+    /**
+     * {@inheritDoc}
+     */
+    public List<Entry> loadComparators( Schema... schemas ) throws LdapException, IOException
+    {
+        return loadSchemaObjects( "comparators", schemas );
+    }
+
+
+    /**
+     * {@inheritDoc}
+     */
+    public List<Entry> loadDitContentRules( Schema... schemas ) throws LdapException,
IOException
+    {
+        return loadSchemaObjects( "ditContentRules", schemas );
+    }
+
+
+    /**
+     * {@inheritDoc}
+     */
+    public List<Entry> loadDitStructureRules( Schema... schemas ) throws LdapException,
IOException
+    {
+        return loadSchemaObjects( "ditStructureRules", schemas );
+    }
+
+
+    /**
+     * {@inheritDoc}
+     */
+    public List<Entry> loadMatchingRules( Schema... schemas ) throws LdapException,
IOException
+    {
+        return loadSchemaObjects( "matchingRules", schemas );
+    }
+
+
+    /**
+     * {@inheritDoc}
+     */
+    public List<Entry> loadMatchingRuleUses( Schema... schemas ) throws LdapException,
IOException
+    {
+        return loadSchemaObjects( "matchingRuleUse", schemas );
+    }
+
+
+    /**
+     * {@inheritDoc}
+     */
+    public List<Entry> loadNameForms( Schema... schemas ) throws LdapException, IOException
+    {
+        return loadSchemaObjects( "nameForms", schemas );
+    }
+
+
+    /**
+     * {@inheritDoc}
+     */
+    public List<Entry> loadNormalizers( Schema... schemas ) throws LdapException, IOException
+    {
+        return loadSchemaObjects( "normalizers", schemas );
+    }
+
+
+    /**
+     * {@inheritDoc}
+     */
+    public List<Entry> loadObjectClasses( Schema... schemas ) throws LdapException,
IOException
+    {
+        return loadSchemaObjects( "objectClasses", schemas );
+    }
+
+
+    /**
+     * {@inheritDoc}
+     */
+    public List<Entry> loadSyntaxes( Schema... schemas ) throws LdapException, IOException
+    {
+        return loadSchemaObjects( "syntaxes", schemas );
+    }
+
+
+    /**
+     * {@inheritDoc}
+     */
+    public List<Entry> loadSyntaxCheckers( Schema... schemas ) throws LdapException,
IOException
+    {
+        return loadSchemaObjects( "syntaxCheckers", schemas );
+    }
+
+
+    // a simple manual test method
+    public static void main( String[] args ) throws Exception
+    {
+        SingleLdifSchemaLoader loader = new SingleLdifSchemaLoader();
+
+        Schema schema = loader.getSchema( "inetorgperson" );
+
+        System.out.println( schema );
+
+        List<Entry> attrList = loader.loadAttributeTypes( schema );
+        assert ( 9 == attrList.size() );
+    }
+
+}
+
+class SchemaMarker
+{
+    private int start;
+    private int end;
+
+
+    public SchemaMarker( int start )
+    {
+        this.start = start;
+    }
+
+
+    public void setEnd( int end )
+    {
+        this.end = end;
+    }
+
+
+    public int getStart()
+    {
+        return start;
+    }
+
+
+    public int getEnd()
+    {
+        return end;
+    }
+}



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