Source Code Cross Referenced for SchemaNamespaceSupport.java in  » XML » xerces-2_9_1 » org » apache » xerces » impl » xs » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » XML » xerces 2_9_1 » org.apache.xerces.impl.xs 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Licensed to the Apache Software Foundation (ASF) under one or more
003:         * contributor license agreements.  See the NOTICE file distributed with
004:         * this work for additional information regarding copyright ownership.
005:         * The ASF licenses this file to You under the Apache License, Version 2.0
006:         * (the "License"); you may not use this file except in compliance with
007:         * the License.  You may obtain a copy of the License at
008:         * 
009:         *      http://www.apache.org/licenses/LICENSE-2.0
010:         * 
011:         * Unless required by applicable law or agreed to in writing, software
012:         * distributed under the License is distributed on an "AS IS" BASIS,
013:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         * See the License for the specific language governing permissions and
015:         * limitations under the License.
016:         */
017:
018:        package org.apache.xerces.impl.xs;
019:
020:        import org.apache.xerces.impl.xs.opti.ElementImpl;
021:        import org.apache.xerces.util.NamespaceSupport;
022:        import org.apache.xerces.util.SymbolTable;
023:        import org.apache.xerces.util.XMLSymbols;
024:        import org.apache.xerces.xni.NamespaceContext;
025:        import org.apache.xerces.xni.QName;
026:        import org.w3c.dom.Attr;
027:        import org.w3c.dom.Document;
028:        import org.w3c.dom.Element;
029:        import org.w3c.dom.NamedNodeMap;
030:        import org.w3c.dom.Node;
031:
032:        /**
033:         * This class customizes the behaviour of the util.NamespaceSupport
034:         * class in order to easily implement some features that we need for
035:         * efficient schema handling.  It will not be generally useful.  
036:         *
037:         * @xerces.internal 
038:         *
039:         * @author Neil Graham, IBM
040:         *
041:         * @version $Id: SchemaNamespaceSupport.java 446734 2006-09-15 20:51:23Z mrglavas $
042:         */
043:        public class SchemaNamespaceSupport extends NamespaceSupport {
044:
045:            private SchemaRootContext fSchemaRootContext = null;
046:
047:            public SchemaNamespaceSupport(Element schemaRoot,
048:                    SymbolTable symbolTable) {
049:                super ();
050:                if (schemaRoot != null && !(schemaRoot instanceof  ElementImpl)) {
051:                    Document ownerDocument = schemaRoot.getOwnerDocument();
052:                    if (ownerDocument != null
053:                            && schemaRoot != ownerDocument.getDocumentElement()) {
054:                        fSchemaRootContext = new SchemaRootContext(schemaRoot,
055:                                symbolTable);
056:                    }
057:                }
058:            } // constructor
059:
060:            // more effecient than NamespaceSupport(NamespaceContext)
061:            public SchemaNamespaceSupport(SchemaNamespaceSupport nSupport) {
062:                fSchemaRootContext = nSupport.fSchemaRootContext;
063:                fNamespaceSize = nSupport.fNamespaceSize;
064:                if (fNamespace.length < fNamespaceSize)
065:                    fNamespace = new String[fNamespaceSize];
066:                System.arraycopy(nSupport.fNamespace, 0, fNamespace, 0,
067:                        fNamespaceSize);
068:                fCurrentContext = nSupport.fCurrentContext;
069:                if (fContext.length <= fCurrentContext)
070:                    fContext = new int[fCurrentContext + 1];
071:                System.arraycopy(nSupport.fContext, 0, fContext, 0,
072:                        fCurrentContext + 1);
073:            } // end constructor
074:
075:            /**
076:             * This method takes a set of Strings, as stored in a
077:             * NamespaceSupport object, and "fools" the object into thinking
078:             * that this is one unified context.  This is meant to be used in
079:             * conjunction with things like local elements, whose declarations
080:             * may be deeply nested but which for all practical purposes may
081:             * be regarded as being one level below the global <schema>
082:             * element--at least with regard to namespace declarations.
083:             * It's worth noting that the context from which the strings are
084:             * being imported had better be using the same SymbolTable.
085:             */
086:            public void setEffectiveContext(String[] namespaceDecls) {
087:                if (namespaceDecls == null || namespaceDecls.length == 0)
088:                    return;
089:                pushContext();
090:                int newSize = fNamespaceSize + namespaceDecls.length;
091:                if (fNamespace.length < newSize) {
092:                    // expand namespace's size...
093:                    String[] tempNSArray = new String[newSize];
094:                    System.arraycopy(fNamespace, 0, tempNSArray, 0,
095:                            fNamespace.length);
096:                    fNamespace = tempNSArray;
097:                }
098:                System.arraycopy(namespaceDecls, 0, fNamespace, fNamespaceSize,
099:                        namespaceDecls.length);
100:                fNamespaceSize = newSize;
101:            } // setEffectiveContext(String):void
102:
103:            /** 
104:             * This method returns an array of Strings, as would be stored in
105:             * a NamespaceSupport object.  This array contains all
106:             * declarations except those at the global level.
107:             */
108:            public String[] getEffectiveLocalContext() {
109:                // the trick here is to recognize that all local contexts
110:                // happen to start at fContext[3].
111:                // context 1: empty
112:                // context 2: decls for xml and xmlns;
113:                // context 3: decls on <xs:schema>: the global ones
114:                String[] returnVal = null;
115:                if (fCurrentContext >= 3) {
116:                    int bottomLocalContext = fContext[3];
117:                    int copyCount = fNamespaceSize - bottomLocalContext;
118:                    if (copyCount > 0) {
119:                        returnVal = new String[copyCount];
120:                        System.arraycopy(fNamespace, bottomLocalContext,
121:                                returnVal, 0, copyCount);
122:                    }
123:                }
124:                return returnVal;
125:            } // getEffectiveLocalContext():String
126:
127:            // This method removes from this object all the namespaces
128:            // returned by getEffectiveLocalContext. 
129:            public void makeGlobal() {
130:                if (fCurrentContext >= 3) {
131:                    fCurrentContext = 3;
132:                    fNamespaceSize = fContext[3];
133:                }
134:            } // makeGlobal
135:
136:            public String getURI(String prefix) {
137:                String uri = super .getURI(prefix);
138:                if (uri == null && fSchemaRootContext != null) {
139:                    if (!fSchemaRootContext.fDOMContextBuilt) {
140:                        fSchemaRootContext.fillNamespaceContext();
141:                        fSchemaRootContext.fDOMContextBuilt = true;
142:                    }
143:                    if (fSchemaRootContext.fNamespaceSize > 0
144:                            && !containsPrefix(prefix)) {
145:                        uri = fSchemaRootContext.getURI(prefix);
146:                    }
147:                }
148:                return uri;
149:            }
150:
151:            /**
152:             * This class keeps track of the namespace bindings 
153:             * declared on ancestors of the schema root.
154:             */
155:            static final class SchemaRootContext {
156:
157:                //
158:                // Data
159:                //
160:
161:                /** 
162:                 * Namespace binding information. This array is composed of a
163:                 * series of tuples containing the namespace binding information:
164:                 * &lt;prefix, uri&gt;.
165:                 */
166:                String[] fNamespace = new String[16 * 2];
167:
168:                /** The size of the namespace information array. */
169:                int fNamespaceSize = 0;
170:
171:                /** 
172:                 * Flag indicating whether the namespace context 
173:                 * has been from the root node's ancestors.
174:                 */
175:                boolean fDOMContextBuilt = false;
176:
177:                /** Schema root. **/
178:                private final Element fSchemaRoot;
179:
180:                /** Symbol table. **/
181:                private final SymbolTable fSymbolTable;
182:
183:                /** Temporary storage for attribute QNames. **/
184:                private final QName fAttributeQName = new QName();
185:
186:                SchemaRootContext(Element schemaRoot, SymbolTable symbolTable) {
187:                    fSchemaRoot = schemaRoot;
188:                    fSymbolTable = symbolTable;
189:                }
190:
191:                void fillNamespaceContext() {
192:                    if (fSchemaRoot != null) {
193:                        Node currentNode = fSchemaRoot.getParentNode();
194:                        while (currentNode != null) {
195:                            if (Node.ELEMENT_NODE == currentNode.getNodeType()) {
196:                                NamedNodeMap attributes = currentNode
197:                                        .getAttributes();
198:                                final int attrCount = attributes.getLength();
199:                                for (int i = 0; i < attrCount; ++i) {
200:                                    Attr attr = (Attr) attributes.item(i);
201:                                    String value = attr.getValue();
202:                                    if (value == null) {
203:                                        value = XMLSymbols.EMPTY_STRING;
204:                                    }
205:                                    fillQName(fAttributeQName, attr);
206:                                    // REVISIT: Should we be looking at non-namespace attributes
207:                                    // for additional mappings? Should we detect illegal namespace
208:                                    // declarations and exclude them from the context? -- mrglavas
209:                                    if (fAttributeQName.uri == NamespaceContext.XMLNS_URI) {
210:                                        // process namespace attribute
211:                                        if (fAttributeQName.prefix == XMLSymbols.PREFIX_XMLNS) {
212:                                            declarePrefix(
213:                                                    fAttributeQName.localpart,
214:                                                    value.length() != 0 ? fSymbolTable
215:                                                            .addSymbol(value)
216:                                                            : null);
217:                                        } else {
218:                                            declarePrefix(
219:                                                    XMLSymbols.EMPTY_STRING,
220:                                                    value.length() != 0 ? fSymbolTable
221:                                                            .addSymbol(value)
222:                                                            : null);
223:                                        }
224:                                    }
225:                                }
226:
227:                            }
228:                            currentNode = currentNode.getParentNode();
229:                        }
230:                    }
231:                }
232:
233:                String getURI(String prefix) {
234:                    // find prefix in the DOM context
235:                    for (int i = 0; i < fNamespaceSize; i += 2) {
236:                        if (fNamespace[i] == prefix) {
237:                            return fNamespace[i + 1];
238:                        }
239:                    }
240:                    // prefix not found
241:                    return null;
242:                }
243:
244:                private void declarePrefix(String prefix, String uri) {
245:                    // resize array, if needed
246:                    if (fNamespaceSize == fNamespace.length) {
247:                        String[] namespacearray = new String[fNamespaceSize * 2];
248:                        System.arraycopy(fNamespace, 0, namespacearray, 0,
249:                                fNamespaceSize);
250:                        fNamespace = namespacearray;
251:                    }
252:
253:                    // bind prefix to uri in current context
254:                    fNamespace[fNamespaceSize++] = prefix;
255:                    fNamespace[fNamespaceSize++] = uri;
256:                }
257:
258:                private void fillQName(QName toFill, Node node) {
259:                    final String prefix = node.getPrefix();
260:                    final String localName = node.getLocalName();
261:                    final String rawName = node.getNodeName();
262:                    final String namespace = node.getNamespaceURI();
263:                    toFill.prefix = (prefix != null) ? fSymbolTable
264:                            .addSymbol(prefix) : XMLSymbols.EMPTY_STRING;
265:                    toFill.localpart = (localName != null) ? fSymbolTable
266:                            .addSymbol(localName) : XMLSymbols.EMPTY_STRING;
267:                    toFill.rawname = (rawName != null) ? fSymbolTable
268:                            .addSymbol(rawName) : XMLSymbols.EMPTY_STRING;
269:                    toFill.uri = (namespace != null && namespace.length() > 0) ? fSymbolTable
270:                            .addSymbol(namespace)
271:                            : null;
272:                }
273:            }
274:
275:        } // class NamespaceSupport
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