v2/src/binding/org/apache/xmlbeans/impl/binding/bts/PathBindingLoader.java

/*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 2003 The Apache Software Foundation.  All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in
*    the documentation and/or other materials provided with the
*    distribution.
*
* 3. The end-user documentation included with the redistribution,
*    if any, must include the following acknowledgment:
*       "This product includes software developed by the
*        Apache Software Foundation (http://www.apache.org/)."
*    Alternately, this acknowledgment may appear in the software itself,
*    if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" must
*    not be used to endorse or promote products derived from this
*    software without prior written permission. For written
*    permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache
*    XMLBeans", nor may "Apache" appear in their name, without prior
*    written permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 2003 BEA Systems
* Inc., <http://www.bea.com/>. For more information on the Apache Software
* Foundation, please see <http://www.apache.org/>.
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package org.apache.xmlbeans.impl.binding.bts;

import org.apache.xmlbeans.impl.binding.bts.BindingLoader;
import org.apache.xmlbeans.impl.binding.bts.BindingType;
import org.apache.xmlbeans.impl.binding.bts.JavaName;

import java.util.ArrayList;
import java.util.List;
import java.util.Iterator;
import java.util.IdentityHashMap;
import java.util.Collections;
import java.util.Collection;
import java.util.Arrays;

/**
 * A binding loader impl with the ability to chain together a path
 * of other loaders.
 */ 
public class PathBindingLoader implements BindingLoader
{
    private final Collection loaderPath;
    public static final PathBindingLoader EMPTY_LOADER = new PathBindingLoader(Collections.EMPTY_LIST);
    
    public static BindingLoader forPath(BindingLoader[] path)
    {
        return forPath(Arrays.asList(path));
    }
    
    public static BindingLoader forPath(Collection path)
    {
        IdentityHashMap seen = new IdentityHashMap();
        
        List flattened = new ArrayList(path.size());
        for (Iterator i = path.iterator(); i.hasNext(); )
            addToPath(flattened, seen, (BindingLoader)i.next());
        
        if (flattened.size() == 0)
            return EMPTY_LOADER;
        
        if (flattened.size() == 1)
            return (BindingLoader)flattened.get(0);
        
        return new PathBindingLoader(flattened);
    }
    
    private static void addToPath(List path, IdentityHashMap seen, BindingLoader loader)
    {
        if (seen.containsKey(loader))
            return;
        
        if (loader instanceof PathBindingLoader)
            for (Iterator j = ((PathBindingLoader)path).loaderPath.iterator(); j.hasNext(); )
                addToPath(path, seen, (BindingLoader)j.next());
        else
            path.add(loader);
    }
    
    private PathBindingLoader(List path)
    {
        loaderPath = Collections.unmodifiableList(path);
    }
    
    public BindingType getBindingType(BindingTypeName btName)
    {
        BindingType result = null;
        for (Iterator i = loaderPath.iterator(); i.hasNext(); )
        {
            result = ((BindingLoader)i.next()).getBindingType(btName);
            if (result != null)
                return result;
        }
        return null;
    }

    public BindingTypeName lookupPojoFor(XmlName xName)
    {
        BindingTypeName result = null;
        for (Iterator i = loaderPath.iterator(); i.hasNext(); )
        {
            result = ((BindingLoader)i.next()).lookupPojoFor(xName);
            if (result != null)
                return result;
        }
        return null;
    }

    public BindingTypeName lookupXmlObjectFor(XmlName xName)
    {
        BindingTypeName result = null;
        for (Iterator i = loaderPath.iterator(); i.hasNext(); )
        {
            result = ((BindingLoader)i.next()).lookupXmlObjectFor(xName);
            if (result != null)
                return result;
        }
        return null;
    }

    public BindingTypeName lookupTypeFor(JavaName jName)
    {
        BindingTypeName result = null;
        for (Iterator i = loaderPath.iterator(); i.hasNext(); )
        {
            result = ((BindingLoader)i.next()).lookupTypeFor(jName);
            if (result != null)
                return result;
        }
        return null;
    }

    public BindingTypeName lookupElementFor(JavaName jName)
    {
        BindingTypeName result = null;
        for (Iterator i = loaderPath.iterator(); i.hasNext(); )
        {
            result = ((BindingLoader)i.next()).lookupElementFor(jName);
            if (result != null)
                return result;
        }
        return null;
    }
}