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MultipleScopeNamespaceSupport.javaAPI DocApache Xerces 3.0.16606Fri Sep 14 20:33:56 BST 2007org.apache.xerces.xinclude

MultipleScopeNamespaceSupport

public class MultipleScopeNamespaceSupport extends org.apache.xerces.util.NamespaceSupport
This implementation of NamespaceContext has the ability to maintain multiple scopes of namespace/prefix bindings. This is useful in situations when it is not always appropriate for elements to inherit the namespace bindings of their ancestors (such as included elements in XInclude). When searching for a URI to match a prefix, or a prefix to match a URI, it is searched for in the current context, then the ancestors of the current context, up to the beginning of the current scope. Other scopes are not searched.
author
Peter McCracken, IBM
version
$Id: MultipleScopeNamespaceSupport.java 447243 2006-09-18 05:15:27Z mrglavas $

Fields Summary
protected int[]
fScope
protected int
fCurrentScope
Constructors Summary
public MultipleScopeNamespaceSupport()


          
      
        super();
        fCurrentScope = 0;
        fScope[0] = 0;
public MultipleScopeNamespaceSupport(org.apache.xerces.xni.NamespaceContext context)

param
context

        super(context);
        fCurrentScope = 0;
        fScope[0] = 0;
Methods Summary
public java.util.EnumerationgetAllPrefixes()

        int count = 0;
        if (fPrefixes.length < (fNamespace.length / 2)) {
            // resize prefix array          
            String[] prefixes = new String[fNamespaceSize];
            fPrefixes = prefixes;
        }
        String prefix = null;
        boolean unique = true;
        for (int i = fContext[fScope[fCurrentScope]];
            i <= (fNamespaceSize - 2);
            i += 2) {
            prefix = fNamespace[i];
            for (int k = 0; k < count; k++) {
                if (fPrefixes[k] == prefix) {
                    unique = false;
                    break;
                }
            }
            if (unique) {
                fPrefixes[count++] = prefix;
            }
            unique = true;
        }
        return new Prefixes(fPrefixes, count);
public java.lang.StringgetPrefix(java.lang.String uri)

        return getPrefix(uri, fNamespaceSize, fContext[fScope[fCurrentScope]]);
public java.lang.StringgetPrefix(java.lang.String uri, int context)

        return getPrefix(uri, fContext[context+1], fContext[fScope[getScopeForContext(context)]]);
public java.lang.StringgetPrefix(java.lang.String uri, int start, int end)

        // this saves us from having a copy of each of these in fNamespace for each scope
        if (uri == NamespaceContext.XML_URI) {
            return XMLSymbols.PREFIX_XML;
        }
        if (uri == NamespaceContext.XMLNS_URI) {
            return XMLSymbols.PREFIX_XMLNS;
        }

        // find uri in current context
        for (int i = start; i > end; i -= 2) {
            if (fNamespace[i - 1] == uri) {
                if (getURI(fNamespace[i - 2]) == uri)
                    return fNamespace[i - 2];
            }
        }

        // uri not found
        return null;
public intgetScopeForContext(int context)

        int scope = fCurrentScope;
        while (context < fScope[scope]) {
            scope--;
        }
        return scope;
public java.lang.StringgetURI(java.lang.String prefix, int start, int end)

        // this saves us from having a copy of each of these in fNamespace for each scope
        if (prefix == XMLSymbols.PREFIX_XML) {
            return NamespaceContext.XML_URI;
        }
        if (prefix == XMLSymbols.PREFIX_XMLNS) {
            return NamespaceContext.XMLNS_URI;
        }

        // find prefix in current context
        for (int i = start; i > end; i -= 2) {
            if (fNamespace[i - 2] == prefix) {
                return fNamespace[i - 1];
            }
        }

        // prefix not found
        return null;
public java.lang.StringgetURI(java.lang.String prefix)

        return getURI(prefix, fNamespaceSize, fContext[fScope[fCurrentScope]]);
public java.lang.StringgetURI(java.lang.String prefix, int context)

        return getURI(prefix, fContext[context+1], fContext[fScope[getScopeForContext(context)]]);
public voidpopScope()
Pops the current scope. The namespace bindings from the new current scope are then used for searching for namespaces and prefixes.

        fCurrentContext = fScope[fCurrentScope--];
        popContext();
public voidpushScope()
Begins a new scope. None of the previous namespace bindings will be used, until the new scope is popped with popScope()

        if (fCurrentScope + 1 == fScope.length) {
            int[] contextarray = new int[fScope.length * 2];
            System.arraycopy(fScope, 0, contextarray, 0, fScope.length);
            fScope = contextarray;
        }
        pushContext();
        fScope[++fCurrentScope] = fCurrentContext;
public voidreset()
Only resets the current scope -- all namespaces defined in lower scopes remain valid after a call to reset.

        fCurrentContext = fScope[fCurrentScope];
        fNamespaceSize = fContext[fCurrentContext];