Source Code Cross Referenced for UnboundFunctionLibrary.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.expr.Expression;
004:        import net.sf.saxon.expr.ExpressionTool;
005:        import net.sf.saxon.expr.UserFunctionCall;
006:        import net.sf.saxon.functions.FunctionLibrary;
007:        import net.sf.saxon.om.NamePool;
008:        import net.sf.saxon.trans.StaticError;
009:        import net.sf.saxon.trans.XPathException;
010:        import net.sf.saxon.Configuration;
011:
012:        import java.util.ArrayList;
013:        import java.util.Iterator;
014:        import java.util.List;
015:
016:        /**
017:         * An UnboundFunctionLibrary is not a real function library; rather, it is used to keep track of function calls
018:         * that cannot yet be bound to a known declared function, but will have to be bound when all user-declared functions
019:         * are available.
020:         */
021:
022:        public class UnboundFunctionLibrary implements  FunctionLibrary {
023:
024:            private List unboundFunctionCalls = new ArrayList(20);
025:            private boolean resolving = false;
026:
027:            /**
028:             * Create an XQueryFunctionLibrary
029:             */
030:
031:            public UnboundFunctionLibrary() {
032:            }
033:
034:            /**
035:             * Test whether a function with a given name and arity is available. This supports
036:             * the function-available() function in XSLT. Since this library is used only in XQuery,
037:             * and contains no real functions, we always return false
038:             * @param uri  The URI of the function name
039:             * @param local  The local part of the function name
040:             * @param arity The number of arguments. This is set to -1 in the case of the single-argument
041:             * function-available() function; in this case the method should return true if there is some
042:             * matching extension function, regardless of its arity.
043:             */
044:
045:            public boolean isAvailable(int fingerprint, String uri,
046:                    String local, int arity) {
047:                return false;
048:            }
049:
050:            /**
051:             * Identify a (namespace-prefixed) function appearing in the expression. This
052:             * method is called by the XQuery parser to resolve function calls found within
053:             * the query.
054:             * <p>Note that a function call may appear earlier in the query than the definition
055:             * of the function to which it is bound. Unlike XSLT, we cannot search forwards to
056:             * find the function definition. Binding of function calls is therefore a two-stage
057:             * process; at the time the function call is parsed, we simply register it as
058:             * pending; subsequently at the end of query parsing all the pending function
059:             * calls are resolved. Another consequence of this is that we cannot tell at the time
060:             * a function call is parsed whether it is a call to an internal (XSLT or XQuery)
061:             * function or to an extension function written in Java.
062:             * @return an Expression representing the function call. This will normally be
063:             * a FunctionCall, but it may be rewritten as some other expression.
064:             * @throws net.sf.saxon.trans.XPathException if the function call is invalid, either because it is
065:             * an unprefixed call to a non-system function, or because it is calling a system
066:             * function that is available in XSLT only. A prefixed function call that cannot
067:             * be recognized at this stage is assumed to be a forwards reference, and is bound
068:             * later when bindUnboundFunctionCalls() is called.
069:             */
070:
071:            public Expression bind(int nameCode, String uri, String local,
072:                    Expression[] arguments) throws XPathException {
073:                if (resolving) {
074:                    return null;
075:                }
076:                UserFunctionCall ufc = new UserFunctionCall();
077:                ufc.setFunctionNameCode(nameCode);
078:                ufc.setArguments(arguments);
079:                unboundFunctionCalls.add(ufc);
080:                return ufc;
081:            }
082:
083:            /**
084:             * Bind function calls that could not be bound when first encountered. These
085:             * will either be forwards references to functions declared later in the query,
086:             * or errors. This method is for internal use.
087:             * @throws net.sf.saxon.trans.StaticError if a function call refers to a function that has
088:             * not been declared
089:             */
090:
091:            public void bindUnboundFunctionCalls(XQueryFunctionBinder lib,
092:                    Configuration config) throws XPathException {
093:                resolving = true;
094:                final NamePool pool = config.getNamePool();
095:                Iterator iter = unboundFunctionCalls.iterator();
096:                while (iter.hasNext()) {
097:                    UserFunctionCall ufc = (UserFunctionCall) iter.next();
098:
099:                    // The original UserFunctionCall is effectively a dummy: we weren't able to find a function
100:                    // definition at the time. So we try again.
101:                    final int nc = ufc.getFunctionNameCode();
102:                    final int arity = ufc.getNumberOfArguments();
103:                    final String uri = pool.getURI(nc);
104:                    final String local = pool.getLocalName(nc);
105:
106:                    XQueryFunction fd = lib.getDeclaration(nc, uri, local, ufc
107:                            .getArguments());
108:                    if (fd != null) {
109:                        fd.registerReference(ufc);
110:                        ufc.setStaticType(fd.getResultType());
111:                        ufc.setConfirmed(true);
112:                    } else {
113:                        String msg = "Cannot find a matching " + arity
114:                                + "-argument function named "
115:                                + pool.getClarkName(nc) + "()";
116:                        if (!config.isAllowExternalFunctions()) {
117:                            msg += ". Note: external function calls have been disabled";
118:                        }
119:                        StaticError err = new StaticError(msg, ExpressionTool
120:                                .getLocator(ufc));
121:                        err.setErrorCode("XPST0017");
122:                        throw err;
123:                    }
124:                }
125:            }
126:
127:            /**
128:             * This method creates a copy of a FunctionLibrary: if the original FunctionLibrary allows
129:             * new functions to be added, then additions to this copy will not affect the original, or
130:             * vice versa.
131:             *
132:             * @return a copy of this function library. This must be an instance of the original class.
133:             */
134:
135:            public FunctionLibrary copy() {
136:                UnboundFunctionLibrary qfl = new UnboundFunctionLibrary();
137:                qfl.unboundFunctionCalls = new ArrayList(unboundFunctionCalls);
138:                return qfl;
139:            }
140:
141:        }
142:
143:        //
144:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
145:        // you may not use this file except in compliance with the License. You may obtain a copy of the
146:        // License at http://www.mozilla.org/MPL/
147:        //
148:        // Software distributed under the License is distributed on an "AS IS" basis,
149:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
150:        // See the License for the specific language governing rights and limitations under the License.
151:        //
152:        // The Original Code is: all this file.
153:        //
154:        // The Initial Developer of the Original Code is Michael H. Kay.
155:        //
156:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
157:        //
158:        // Contributor(s): none.
159:        //
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