org.apache.xmlbeans.impl.values.NamespaceContext 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.values;

import org.apache.xmlbeans.impl.common.PrefixResolver;

import org.apache.xmlbeans.XmlObject;
import org.apache.xmlbeans.XmlCursor;

import java.util.ArrayList;
import java.util.Map;
import java.lang.reflect.Proxy;
import java.lang.ref.SoftReference;

import org.apache.xmlbeans.xml.stream.StartElement;

public class NamespaceContext implements PrefixResolver
{
    private static final int TYPE_STORE    = 1;
    private static final int XML_OBJECT    = 2;
    private static final int MAP           = 3;
    private static final int START_ELEMENT = 4;
    private static final int RESOLVER      = 5;

    private Object _obj;
    private int _code;

    public NamespaceContext(Map prefixToUriMap)
    {
        _code = MAP;
        _obj = prefixToUriMap;
    }

    public NamespaceContext(TypeStore typeStore)
    {
        _code = TYPE_STORE;
        _obj = typeStore;
    }

    public NamespaceContext(XmlObject xmlObject)
    {
        _code = XML_OBJECT;
        _obj = xmlObject;
    }

    public NamespaceContext(StartElement start)
    {
        _code = START_ELEMENT;
        _obj = start;
    }

    public NamespaceContext(PrefixResolver resolver)
    {
        _code = RESOLVER;
        _obj = resolver;
    }

    /**
     * Stack management if (heaven help us) we ever need to do
     * nested compilation of schema type system.
     */
    private static final class NamespaceContextStack
    {
        NamespaceContext current;
        ArrayList stack = new ArrayList();
        final void push(NamespaceContext next)
        {
            stack.add(current);
            current = next;
        }
        final void pop()
        {
            current = (NamespaceContext)stack.get(stack.size() - 1);
            stack.remove(stack.size() - 1);
        }
    }

    private static ThreadLocal tl_namespaceContextStack = new ThreadLocal();

    public static void clearThreadLocals() {
        tl_namespaceContextStack.remove();
    }

    private static NamespaceContextStack getNamespaceContextStack()
    {
        NamespaceContextStack namespaceContextStack = (NamespaceContextStack) tl_namespaceContextStack.get();
        if (namespaceContextStack==null)
        {
            namespaceContextStack = new NamespaceContextStack();
            tl_namespaceContextStack.set(namespaceContextStack);
        }
        return namespaceContextStack;
    }

    public static void push(NamespaceContext next)
    {
        getNamespaceContextStack().push(next);
    }
            
    public static void pop()
    {
        NamespaceContextStack nsContextStack = getNamespaceContextStack();
        nsContextStack.pop();

        if (nsContextStack.stack.size()==0)
            tl_namespaceContextStack.set(null);
    }

    public static PrefixResolver getCurrent()
    {
        return getNamespaceContextStack().current;
    }

    public String getNamespaceForPrefix(String prefix)
    {
        if (prefix != null && prefix.equals("xml"))
            return "http://www.w3.org/XML/1998/namespace";
        
        switch (_code)
        {
            case XML_OBJECT:
            {
                TypeStoreUser impl;
                Object obj = _obj;
                if (Proxy.isProxyClass(obj.getClass()))
                    obj = Proxy.getInvocationHandler(obj);

                if (obj instanceof TypeStoreUser)
                    return ((TypeStoreUser)obj).get_store().getNamespaceForPrefix(prefix);

                XmlCursor cur = ((XmlObject)_obj).newCursor();
                if (cur != null)
                {
                    if (cur.currentTokenType() == XmlCursor.TokenType.ATTR)
                        cur.toParent();
                    try { return cur.namespaceForPrefix(prefix); }
                    finally { cur.dispose(); }
                }
            }
            
            case MAP:
                return (String)((Map)_obj).get(prefix);
                
            case TYPE_STORE:
                return ((TypeStore)_obj).getNamespaceForPrefix(prefix);
                
            case START_ELEMENT:
                return ((StartElement)_obj).getNamespaceUri(prefix);
                
            case RESOLVER:
                return ((PrefixResolver)_obj).getNamespaceForPrefix(prefix);
                
            default:
                assert false : "Improperly initialized NamespaceContext.";
                return null;
        }
    }
}