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Java > Open Source Codes > com > sun > org > apache > xerces > internal > xinclude > XIncludeNamespaceSupport


1 /*
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57 package com.sun.org.apache.xerces.internal.xinclude;
58
59 import com.sun.org.apache.xerces.internal.xni.NamespaceContext;
60
61 /**
62  * This is an implementation of NamespaceContext which is intended to be used for
63  * XInclude processing. It enables each context to be marked as invalid, if necessary,
64  * to indicate that the namespaces recorded on those contexts won't be apparent in the
65  * resulting infoset.
66  *
67  * @author Peter McCracken, IBM
68  *
69  * @version $Id: XIncludeNamespaceSupport.java,v 1.4 2004/01/22 16:08:58 mrglavas Exp $
70  */
71 public class XIncludeNamespaceSupport extends MultipleScopeNamespaceSupport {
72
73     /**
74      * This stores whether or not the context at the matching depth was valid.
75      */
76     private boolean[] fValidContext = new boolean[8];
77
78     /**
79      *
80      */
81     public XIncludeNamespaceSupport() {
82         super();
83     }
84
85     /**
86      * @param context
87      */
88     public XIncludeNamespaceSupport(NamespaceContext context) {
89         super(context);
90     }
91
92     /**
93      * Pushes a new context onto the stack.
94      */
95     public void pushContext() {
96         super.pushContext();
97         if (fCurrentContext + 1 == fValidContext.length) {
98             boolean[] contextarray = new boolean[fValidContext.length * 2];
99             System.arraycopy(fValidContext, 0, contextarray, 0, fValidContext.length);
100             fValidContext = contextarray;
101         }
102
103         fValidContext[fCurrentContext] = true;
104     }
105
106     /**
107      * This method is used to set a context invalid for XInclude namespace processing.
108      * Any context defined by an &lt;include&gt; or &lt;fallback&gt; element is not
109      * valid for processing the include parent's [in-scope namespaces]. Thus, contexts
110      * defined by these elements are set to invalid by the XInclude processor using
111      * this method.
112      */
113     public void setContextInvalid() {
114         fValidContext[fCurrentContext] = false;
115     }
116     
117     /**
118      * This returns the namespace URI which was associated with the given pretext, in
119      * the context that existed at the include parent of the current element. The
120      * include parent is the last element, before the current one, which was not set
121      * to an invalid context using setContextInvalid()
122      *
123      * @param prefix the prefix of the desired URI
124      * @return the URI corresponding to the prefix in the context of the include parent
125      */
126     public String JavaDoc getURIFromIncludeParent(String JavaDoc prefix) {
127         int lastValidContext = fCurrentContext - 1;
128         while (!fValidContext[lastValidContext]) {
129             lastValidContext--;
130         }
131         return getURI(prefix, lastValidContext);
132     }
133 }
134
135
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