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Java > Open Source Codes > com > sun > org > apache > xerces > internal > impl > xs > SchemaNamespaceSupport


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57
58 package com.sun.org.apache.xerces.internal.impl.xs;
59
60 import com.sun.org.apache.xerces.internal.util.NamespaceSupport;
61
62 /**
63  * This class customizes the behaviour of the util.NamespaceSupport
64  * class in order to easily implement some features that we need for
65  * efficient schema handling. It will not be generally useful.
66  *
67  * @author Neil Graham, IBM
68  *
69  * @version $Id: SchemaNamespaceSupport.java,v 1.4 2002/08/14 22:49:28 sandygao Exp $
70  */
71 public class SchemaNamespaceSupport
72     extends NamespaceSupport {
73
74     public SchemaNamespaceSupport () {
75         super();
76     } // constructor
77
78     // more effecient than NamespaceSupport(NamespaceContext)
79 public SchemaNamespaceSupport(SchemaNamespaceSupport nSupport) {
80         fNamespaceSize = nSupport.fNamespaceSize;
81         if (fNamespace.length < fNamespaceSize)
82             fNamespace = new String JavaDoc[fNamespaceSize];
83         System.arraycopy(nSupport.fNamespace, 0, fNamespace, 0, fNamespaceSize);
84         fCurrentContext = nSupport.fCurrentContext;
85         if (fContext.length <= fCurrentContext)
86             fContext = new int[fCurrentContext+1];
87         System.arraycopy(nSupport.fContext, 0, fContext, 0, fCurrentContext+1);
88     } // end constructor
89
90     /**
91      * This method takes a set of Strings, as stored in a
92      * NamespaceSupport object, and "fools" the object into thinking
93      * that this is one unified context. This is meant to be used in
94      * conjunction with things like local elements, whose declarations
95      * may be deeply nested but which for all practical purposes may
96      * be regarded as being one level below the global <schema>
97      * element--at least with regard to namespace declarations.
98      * It's worth noting that the context from which the strings are
99      * being imported had better be using the same SymbolTable.
100      */
101     public void setEffectiveContext (String JavaDoc [] namespaceDecls) {
102         if(namespaceDecls == null || namespaceDecls.length == 0) return;
103         pushContext();
104         int newSize = fNamespaceSize + namespaceDecls.length;
105         if (fNamespace.length < newSize) {
106             // expand namespace's size...
107 String JavaDoc[] tempNSArray = new String JavaDoc[newSize];
108             System.arraycopy(fNamespace, 0, tempNSArray, 0, fNamespace.length);
109             fNamespace = tempNSArray;
110         }
111         System.arraycopy(namespaceDecls, 0, fNamespace, fNamespaceSize,
112                          namespaceDecls.length);
113         fNamespaceSize = newSize;
114     } // setEffectiveContext(String):void
115
116     /**
117      * This method returns an array of Strings, as would be stored in
118      * a NamespaceSupport object. This array contains all
119      * declarations except those at the global level.
120      */
121     public String JavaDoc [] getEffectiveLocalContext() {
122         // the trick here is to recognize that all local contexts
123 // happen to start at fContext[3].
124 // context 1: empty
125 // context 2: decls for xml and xmlns;
126 // context 3: decls on <xs:schema>: the global ones
127 String JavaDoc[] returnVal = null;
128         if (fCurrentContext >= 3) {
129             int bottomLocalContext = fContext[3];
130             int copyCount = fNamespaceSize - bottomLocalContext;
131             if (copyCount > 0) {
132                 returnVal = new String JavaDoc[copyCount];
133                 System.arraycopy(fNamespace, bottomLocalContext, returnVal, 0,
134                                  copyCount);
135             }
136         }
137         return returnVal;
138     } // getEffectiveLocalContext():String
139
140     // This method removes from this object all the namespaces
141 // returned by getEffectiveLocalContext.
142 public void makeGlobal() {
143         if (fCurrentContext >= 3) {
144             fCurrentContext = 3;
145             fNamespaceSize = fContext[3];
146         }
147     } // makeGlobal
148 } // class NamespaceSupport
149
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