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Java > Open Source Codes > net > sf > saxon > style > XSLApplyTemplates


1 package net.sf.saxon.style;
2 import net.sf.saxon.Err;
3 import net.sf.saxon.expr.*;
4 import net.sf.saxon.instruct.ApplyTemplates;
5 import net.sf.saxon.instruct.Executable;
6 import net.sf.saxon.om.*;
7 import net.sf.saxon.sort.SortExpression;
8 import net.sf.saxon.sort.SortKeyDefinition;
9 import net.sf.saxon.trans.Mode;
10 import net.sf.saxon.trans.XPathException;
11 import net.sf.saxon.type.Type;
12 import net.sf.saxon.value.SequenceType;
13 import net.sf.saxon.value.Whitespace;
14
15
16 /**
17 * An xsl:apply-templates element in the stylesheet
18 */
19
20 public class XSLApplyTemplates extends StyleElement {
21
22     private Expression select;
23     private int modeNameCode = -1; // -1 if no mode specified
24 private boolean useCurrentMode = false;
25     private boolean useTailRecursion = false;
26     private Mode mode;
27     private String JavaDoc modeAttribute;
28
29     /**
30     * Determine whether this node is an instruction.
31     * @return true - it is an instruction
32     */
33
34     public boolean isInstruction() {
35         return true;
36     }
37
38
39     public void prepareAttributes() throws XPathException {
40
41         AttributeCollection atts = getAttributeList();
42
43         String JavaDoc selectAtt = null;
44
45         for (int a=0; a<atts.getLength(); a++) {
46             int nc = atts.getNameCode(a);
47             String JavaDoc f = getNamePool().getClarkName(nc);
48             if (f==StandardNames.MODE) {
49                 modeAttribute = atts.getValue(a).trim();
50             } else if (f==StandardNames.SELECT) {
51                 selectAtt = atts.getValue(a);
52             } else {
53                 checkUnknownAttribute(nc);
54             }
55         }
56
57         if (modeAttribute!=null) {
58             if (modeAttribute.equals("#current")) {
59                 useCurrentMode = true;
60             } else if (modeAttribute.equals("#default")) {
61                 // do nothing;
62 } else {
63                 try {
64                     modeNameCode = makeNameCode(modeAttribute.trim());
65                 } catch (NamespaceException err) {
66                     reportInvalidAttribute(err.getMessage(), "XTSE0280");
67                     modeNameCode = -1;
68                 } catch (XPathException err) {
69                     reportInvalidAttribute("Mode name " + Err.wrap(modeAttribute) + " is not a valid QName", "XTSE0280");
70                     modeNameCode = -1;
71                 }
72             }
73         }
74
75         if (selectAtt!=null) {
76             select = makeExpression(selectAtt);
77         }
78     }
79
80     public void validate() throws XPathException {
81
82         checkWithinTemplate();
83
84         // get the Mode object
85 if (!useCurrentMode) {
86             mode = getPrincipalStylesheet().getRuleManager().getMode(modeNameCode);
87         }
88
89         // handle sorting if requested
90
91         AxisIterator kids = iterateAxis(Axis.CHILD);
92         while (true) {
93             NodeInfo child = (NodeInfo)kids.next();
94             if (child == null) {
95                 break;
96             }
97             if (child instanceof XSLSort) {
98                 // no-op
99 } else if (child instanceof XSLWithParam) {
100                 // usesParams = true;
101 } else if (child.getNodeKind() == Type.TEXT) {
102                     // with xml:space=preserve, white space nodes may still be there
103 if (!Whitespace.isWhite(child.getStringValueCS())) {
104                     compileError("No character data is allowed within xsl:apply-templates", "XTSE0010");
105                 }
106             } else {
107                 compileError("Invalid element within xsl:apply-templates", "XTSE0010");
108             }
109         }
110
111         if (select==null) {
112             select = new AxisExpression(Axis.CHILD, null);
113         }
114
115         select = typeCheck("select", select);
116         try {
117             RoleLocator role =
118                 new RoleLocator(RoleLocator.INSTRUCTION, "xsl:apply-templates/select", 0, null);
119             role.setSourceLocator(new ExpressionLocation(this));
120             role.setErrorCode("XTTE0520");
121             select = TypeChecker.staticTypeCheck(select,
122                                         SequenceType.NODE_SEQUENCE,
123                                         false, role, getStaticContext());
124         } catch (XPathException err) {
125             compileError(err);
126         }
127
128     }
129
130     /**
131      * Mark tail-recursive calls on templates and functions.
132      * For most instructions, this does nothing.
133     */
134
135     public void markTailCalls() {
136         useTailRecursion = true;
137     }
138
139
140     public Expression compile(Executable exec) throws XPathException {
141         SortKeyDefinition[] sortKeys = makeSortKeys();
142         if (sortKeys != null) {
143             useTailRecursion = false;
144         }
145         Expression sortedSequence = select;
146         if (sortKeys != null) {
147             sortedSequence = new SortExpression(select, sortKeys);
148             ExpressionTool.makeParentReferences(sortedSequence);
149         }
150         ApplyTemplates app = new ApplyTemplates(
151                                     sortedSequence,
152                                     useCurrentMode,
153                                     useTailRecursion,
154                                     mode,
155                                     backwardsCompatibleModeIsEnabled());
156         app.setActualParameters(getWithParamInstructions(exec, false, app),
157                                  getWithParamInstructions(exec, true, app));
158         ExpressionTool.makeParentReferences(app);
159         return app;
160     }
161
162 }
163
164 //
165 // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
166 // you may not use this file except in compliance with the License. You may obtain a copy of the
167 // License at http://www.mozilla.org/MPL/
168 //
169 // Software distributed under the License is distributed on an "AS IS" basis,
170 // WITHOUT WARRANTY OF ANY KIND, either express or implied.
171 // See the License for the specific language governing rights and limitations under the License.
172 //
173 // The Original Code is: all this file.
174 //
175 // The Initial Developer of the Original Code is Michael H. Kay.
176 //
177 // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
178 //
179 // Contributor(s): none.
180 //
181
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