org.apache.xmlbeans.impl.repackage.Repackager Maven / Gradle / Ivy

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The Apache Commons Codec package contains simple encoder and decoders for various formats such as Base64 and Hexadecimal. In addition to these widely used encoders and decoders, the codec package also maintains a collection of phonetic encoding utilities.
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/*   Copyright 2004 The Apache Software Foundation
 *
 *   Licensed 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.xmlbeans.impl.repackage;

import java.util.List;
import java.util.ArrayList;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
import java.io.File;

public class Repackager
{
    public Repackager ( String repackageSpecs )
    {
        _fromPackages = new ArrayList();
        _toPackages = new ArrayList();
        
        List repackages = splitPath( repackageSpecs, ';' );

        // Sort the repackage spec so that longer from's are first to match
        // longest package first
        
        for ( ; ; )
        {
            boolean swapped = false;

            for ( int i = 1 ; i < repackages.size() ; i++ )
            {
                String spec1 = (String) repackages.get( i - 1 );
                String spec2 = (String) repackages.get( i );
                
                if (spec1.indexOf( ':' ) < spec2.indexOf( ':' ))
                {
                    repackages.set( i - 1, spec2 );
                    repackages.set( i, spec1 );
                    
                    swapped = true;
                }
            }

            if (!swapped)
                break;
        }

        for ( int i = 0 ; i < repackages.size() ; i++ )
        {
            String spec = (String) repackages.get( i );
            
            int j = spec.indexOf( ':' );

            if (j < 0 || spec.indexOf( ':', j + 1 ) >= 0)
                throw new RuntimeException( "Illegal repackage specification: " + spec );

            String from = spec.substring( 0, j );
            String to = spec.substring( j + 1 );

            _fromPackages.add( Repackager.splitPath( from, '.' ) );
            _toPackages.add( Repackager.splitPath( to, '.' ) );
        }

        _fromMatchers = new Matcher [ _fromPackages.size() * 2 ];
        _toPackageNames = new String [ _fromPackages.size() * 2 ];

        addPatterns( '.', 0 );
        addPatterns( '/', _fromPackages.size() );
    }

    void addPatterns ( char sep, int off )
    {
        for ( int i = 0 ; i < _fromPackages.size() ; i++ )
        {
            List from = (List) _fromPackages.get( i );
            List to = (List) _toPackages.get( i );

            String pattern = "";
            
            for ( int j = 0 ; j < from.size() ; j++ )
            {
                if (j > 0)
                    pattern += "\\" + sep;

                pattern += from.get( j );
            }
            
            String toPackage = "";
            
            for ( int j = 0 ; j < to.size() ; j++ )
            {
                if (j > 0)
                    toPackage += sep;

                toPackage += to.get( j );
            }

            _fromMatchers[ off + i ] = Pattern.compile( pattern ).matcher( "" );
            _toPackageNames[ off + i ] = toPackage;
        }
    }

    public StringBuffer repackage ( StringBuffer sb )
    {
        StringBuffer result = null;

        for ( int i = 0 ; i < _fromMatchers.length ; i++ )
        {
            Matcher m = (Matcher) _fromMatchers[ i ];
            
            m.reset( sb );
            
            for ( boolean found = m.find() ; found ; found = m.find() )
            {
                if (result == null)
                    result = new StringBuffer();

                m.appendReplacement( result, _toPackageNames[ i ] );
            }

            if (result != null)
            {
                m.appendTail( result );
                sb = result;
                result = null;
            }
        }

        return sb;
    }

    public List getFromPackages ( )
    {
        return _fromPackages;
    }

    public List getToPackages ( )
    {
        return _toPackages;
    }
    
    public static ArrayList splitPath ( String path, char separator )
    {
        ArrayList components = new ArrayList();
        
        for ( ; ; )
        {
            int i = path.indexOf( separator );

            if (i < 0)
                break;

            components.add( path.substring( 0, i ) );
            
            path = path.substring( i + 1 );
        }

        if (path.length() > 0)
            components.add( path );

        return components;
    }
    
    public static String dirForPath ( String path )
    {
        return new File(path).getParent();
    }

    private List _fromPackages;
    private List _toPackages;
    
    private Matcher[] _fromMatchers;
    private String[]  _toPackageNames;
}