Source Code Cross Referenced for StandardModuleURIResolver.java in  » XML » saxonb » net » sf » saxon » query » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » XML » saxonb » net.sf.saxon.query 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package net.sf.saxon.query;
002:
003:        import net.sf.saxon.StandardURIResolver;
004:        import net.sf.saxon.trans.StaticError;
005:        import net.sf.saxon.trans.XPathException;
006:
007:        import javax.xml.transform.stream.StreamSource;
008:        import java.io.BufferedInputStream;
009:        import java.io.IOException;
010:        import java.io.InputStream;
011:        import java.io.InputStreamReader;
012:        import java.net.URI;
013:        import java.net.URISyntaxException;
014:        import java.net.URL;
015:        import java.net.URLConnection;
016:
017:        /**
018:         * This class is the standard ModuleURIResolver used to implement the "import module" declaration
019:         * in a Query Prolog. It is used when no user-defined ModuleURIResolver has been specified, or when
020:         * the user-defined ModuleURIResolver decides to delegate to the standard ModuleURIResolver.
021:         * @author Michael H. Kay
022:         */
023:
024:        public class StandardModuleURIResolver implements  ModuleURIResolver {
025:
026:            /**
027:             * Resolve a module URI and associated location hints.
028:             * @param moduleURI The module namespace URI of the module to be imported; or null when
029:             * loading a non-library module.
030:             * @param baseURI The base URI of the module containing the "import module" declaration;
031:             * null if no base URI is known
032:             * @param locations The set of URIs specified in the "at" clause of "import module",
033:             * which serve as location hints for the module
034:             * @return an array of StreamSource objects each identifying the contents of a module to be
035:             * imported. Each StreamSource must contain a
036:             * non-null absolute System ID which will be used as the base URI of the imported module,
037:             * and either an InputSource or a Reader representing the text of the module. The method
038:             * may also return null, in which case the system attempts to resolve the URI using the
039:             * standard module URI resolver.
040:             * @throws net.sf.saxon.trans.XPathException if the module cannot be located
041:             */
042:
043:            public StreamSource[] resolve(String moduleURI, String baseURI,
044:                    String[] locations) throws XPathException {
045:                if (locations.length == 0) {
046:                    StaticError err = new StaticError(
047:                            "Cannot locate module for namespace " + moduleURI);
048:                    err.setErrorCode("XQST0059");
049:                    throw err;
050:                } else {
051:                    // One or more locations given: import modules from all these locations
052:                    StreamSource[] sources = new StreamSource[locations.length];
053:                    for (int m = 0; m < locations.length; m++) {
054:                        String href = locations[m];
055:                        URI absoluteURI;
056:                        try {
057:                            absoluteURI = StandardURIResolver.makeAbsolute(
058:                                    href, baseURI);
059:                        } catch (URISyntaxException err) {
060:                            StaticError se = new StaticError(
061:                                    "Cannot resolve relative URI " + href, err);
062:                            se.setErrorCode("XQST0059");
063:                            throw se;
064:                        }
065:                        sources[m] = getQuerySource(absoluteURI);
066:                    }
067:                    return sources;
068:                }
069:            }
070:
071:            /**
072:             * Get a StreamSource object representing the source of a query, given its URI.
073:             * This method attempts to discover the encoding by reading any HTTP headers.
074:             * If the encoding can be determined, it returns a StreamSource containing a Reader that
075:             * performs the required decoding. Otherwise, it returns a StreamSource containing an
076:             * InputSource, leaving the caller to sort out encoding problems.
077:             * @param absoluteURI the absolute URI of the source query
078:             * @return a StreamSource containing a Reader or InputSource, as well as a systemID representing
079:             * the base URI of the query.
080:             * @throws net.sf.saxon.trans.StaticError if the URIs are invalid or cannot be resolved or dereferenced, or
081:             * if any I/O error occurs
082:             */
083:
084:            public static StreamSource getQuerySource(URI absoluteURI)
085:                    throws StaticError {
086:
087:                try {
088:                    InputStream is;
089:                    URL absoluteURL = absoluteURI.toURL();
090:                    URLConnection connection = absoluteURL.openConnection();
091:                    connection.connect();
092:                    is = connection.getInputStream();
093:
094:                    if (!is.markSupported()) {
095:                        is = new BufferedInputStream(is);
096:                    }
097:
098:                    // Get any external (HTTP) encoding label.
099:                    String contentType;
100:                    String encoding = null;
101:
102:                    // The file:// URL scheme gives no useful information...
103:                    if (!"file".equals(connection.getURL().getProtocol())) {
104:
105:                        // Use the contentType from the HTTP header if available
106:                        contentType = connection.getContentType();
107:
108:                        if (contentType != null) {
109:                            int pos = contentType.indexOf("charset");
110:                            if (pos >= 0) {
111:                                pos = contentType.indexOf('=', pos + 7);
112:                                if (pos >= 0) {
113:                                    contentType = contentType
114:                                            .substring(pos + 1);
115:                                }
116:                                if ((pos = contentType.indexOf(';')) > 0) {
117:                                    contentType = contentType.substring(0, pos);
118:                                }
119:
120:                                // attributes can have comment fields (RFC 822)
121:                                if ((pos = contentType.indexOf('(')) > 0) {
122:                                    contentType = contentType.substring(0, pos);
123:                                }
124:                                // ... and values may be quoted
125:                                if ((pos = contentType.indexOf('"')) > 0) {
126:                                    contentType = contentType.substring(
127:                                            pos + 1, contentType.indexOf('"',
128:                                                    pos + 2));
129:                                }
130:                                encoding = contentType.trim();
131:                            }
132:                        }
133:                    }
134:                    StreamSource ss = new StreamSource();
135:                    if (encoding == null) {
136:                        ss.setInputStream(is);
137:                    } else {
138:                        ss.setReader(new InputStreamReader(is, encoding));
139:                    }
140:                    ss.setSystemId(absoluteURL.toString());
141:                    return ss;
142:                } catch (IOException err) {
143:                    StaticError se = new StaticError(err);
144:                    se.setErrorCode("XQST0059");
145:                    throw se;
146:                }
147:
148:            }
149:        }
150:
151:        //
152:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
153:        // you may not use this file except in compliance with the License. You may obtain a copy of the
154:        // License at http://www.mozilla.org/MPL/
155:        //
156:        // Software distributed under the License is distributed on an "AS IS" basis,
157:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
158:        // See the License for the specific language governing rights and limitations under the License.
159:        //
160:        // The Original Code is: all this file.
161:        //
162:        // The Initial Developer of the Original Code is Michael H. Kay
163:        //
164:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
165:        //
166:        // Contributor(s): none.
167:        //
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