Source Code Cross Referenced for XSLCallTemplate.java in  » XML » XPath-Saxon » net » sf » saxon » style » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » XML » XPath Saxon » net.sf.saxon.style 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package net.sf.saxon.style;
002:
003:        import net.sf.saxon.Err;
004:        import net.sf.saxon.expr.Expression;
005:        import net.sf.saxon.expr.ExpressionTool;
006:        import net.sf.saxon.instruct.CallTemplate;
007:        import net.sf.saxon.instruct.Executable;
008:        import net.sf.saxon.instruct.Template;
009:        import net.sf.saxon.om.*;
010:        import net.sf.saxon.trans.XPathException;
011:        import net.sf.saxon.type.AnyItemType;
012:        import net.sf.saxon.type.ItemType;
013:        import net.sf.saxon.type.Type;
014:        import net.sf.saxon.value.SequenceType;
015:        import net.sf.saxon.value.Whitespace;
016:
017:        import java.util.List;
018:
019:        /**
020:         * An xsl:call-template element in the stylesheet
021:         */
022:
023:        public class XSLCallTemplate extends StyleElement {
024:
025:            private int calledTemplateFingerprint = -1; // the fingerprint of the called template
026:            private XSLTemplate template = null;
027:            private boolean useTailRecursion = false;
028:            private String calledTemplateName = null; // used only for diagnostics
029:            private Expression calledTemplateExpression; // allows name to be an AVT
030:
031:            /**
032:             * Determine whether the called template can be specified as an AVT
033:             */
034:
035:            protected boolean allowAVT() {
036:                return false;
037:            }
038:
039:            /**
040:             * Determine whether this node is an instruction.
041:             * @return true - it is an instruction
042:             */
043:
044:            public boolean isInstruction() {
045:                return true;
046:            }
047:
048:            /**
049:             * Determine the type of item returned by this instruction (only relevant if
050:             * it is an instruction).
051:             * @return the item type returned
052:             */
053:
054:            protected ItemType getReturnedItemType() {
055:                if (template == null) {
056:                    return AnyItemType.getInstance();
057:                } else {
058:                    return template.getReturnedItemType();
059:                }
060:            }
061:
062:            public void prepareAttributes() throws XPathException {
063:
064:                AttributeCollection atts = getAttributeList();
065:
066:                String nameAttribute = null;
067:
068:                for (int a = 0; a < atts.getLength(); a++) {
069:                    int nc = atts.getNameCode(a);
070:                    String f = getNamePool().getClarkName(nc);
071:                    if (f == StandardNames.NAME) {
072:                        nameAttribute = atts.getValue(a).trim();
073:                    } else {
074:                        checkUnknownAttribute(nc);
075:                    }
076:                }
077:
078:                if (nameAttribute == null) {
079:                    reportAbsence("name");
080:                    return;
081:                }
082:
083:                if (allowAVT() && nameAttribute.indexOf('{') >= 0) {
084:                    calledTemplateExpression = makeAttributeValueTemplate(nameAttribute);
085:                } else {
086:                    calledTemplateName = nameAttribute;
087:                    try {
088:                        calledTemplateFingerprint = makeNameCode(nameAttribute
089:                                .trim()) & 0xfffff;
090:                    } catch (NamespaceException err) {
091:                        compileError(err.getMessage(), "XTSE0280");
092:                    } catch (XPathException err) {
093:                        compileError(err.getMessage(), "XTSE0280");
094:                    }
095:                }
096:            }
097:
098:            public void validate() throws XPathException {
099:                checkWithinTemplate();
100:
101:                AxisIterator kids = iterateAxis(Axis.CHILD);
102:                while (true) {
103:                    NodeInfo child = (NodeInfo) kids.next();
104:                    if (child == null) {
105:                        break;
106:                    }
107:                    if (child instanceof  XSLWithParam) {
108:                        // OK;
109:                    } else if (child instanceof  XSLFallback
110:                            && mayContainFallback()) {
111:                        // xsl:fallback is not allowed on xsl:call-template, but is allowed on saxon:call-template (cheat!)
112:                    } else if (child.getNodeKind() == Type.TEXT) {
113:                        // with xml:space=preserve, white space nodes may still be there
114:                        if (!Whitespace.isWhite(child.getStringValueCS())) {
115:                            compileError(
116:                                    "No character data is allowed within xsl:call-template",
117:                                    "XTSE0010");
118:                        }
119:                    } else {
120:                        compileError("Child element "
121:                                + Err.wrap(child.getDisplayName(), Err.ELEMENT)
122:                                + " is not allowed within xsl:call-template",
123:                                "XTSE0010");
124:                    }
125:                }
126:                if (calledTemplateExpression == null) {
127:                    template = findTemplate(calledTemplateFingerprint);
128:                    if (template == null) {
129:                        return;
130:                    }
131:                }
132:                calledTemplateExpression = typeCheck("name",
133:                        calledTemplateExpression);
134:            }
135:
136:            public void postValidate() throws XPathException {
137:                // check that a parameter is supplied for each required parameter
138:                // of the called template
139:
140:                if (template != null) {
141:                    AxisIterator declaredParams = template
142:                            .iterateAxis(Axis.CHILD);
143:                    while (true) {
144:                        NodeInfo param = (NodeInfo) declaredParams.next();
145:                        if (param == null) {
146:                            break;
147:                        }
148:                        if (param instanceof  XSLParam
149:                                && ((XSLParam) param).isRequiredParam()
150:                                && !((XSLParam) param).isTunnelParam()) {
151:                            AxisIterator actualParams = iterateAxis(Axis.CHILD);
152:                            boolean ok = false;
153:                            while (true) {
154:                                NodeInfo withParam = (NodeInfo) actualParams
155:                                        .next();
156:                                if (withParam == null) {
157:                                    break;
158:                                }
159:                                if (withParam instanceof  XSLWithParam
160:                                        && ((XSLWithParam) withParam)
161:                                                .getVariableFingerprint() == ((XSLParam) param)
162:                                                .getVariableFingerprint()) {
163:                                    ok = true;
164:                                    break;
165:                                }
166:                            }
167:                            if (!ok) {
168:                                compileError(
169:                                        "No value supplied for required parameter "
170:                                                + Err.wrap(((XSLParam) param)
171:                                                        .getVariableName(),
172:                                                        Err.VARIABLE),
173:                                        "XTSE0690");
174:                            }
175:                        }
176:                    }
177:
178:                    // check that every supplied parameter is declared in the called
179:                    // template
180:
181:                    AxisIterator actualParams = iterateAxis(Axis.CHILD);
182:                    while (true) {
183:                        NodeInfo w = (NodeInfo) actualParams.next();
184:                        if (w == null) {
185:                            break;
186:                        }
187:                        if (w instanceof  XSLWithParam
188:                                && !((XSLWithParam) w).isTunnelParam()) {
189:                            XSLWithParam withParam = (XSLWithParam) w;
190:                            AxisIterator formalParams = template
191:                                    .iterateAxis(Axis.CHILD);
192:                            boolean ok = false;
193:                            while (true) {
194:                                NodeInfo param = (NodeInfo) formalParams.next();
195:                                if (param == null) {
196:                                    break;
197:                                }
198:                                if (param instanceof  XSLParam
199:                                        && ((XSLParam) param)
200:                                                .getVariableFingerprint() == withParam
201:                                                .getVariableFingerprint()) {
202:                                    ok = true;
203:                                    SequenceType required = ((XSLParam) param)
204:                                            .getRequiredType();
205:                                    withParam
206:                                            .checkAgainstRequiredType(required);
207:                                    break;
208:                                }
209:                            }
210:                            if (!ok) {
211:                                if (!backwardsCompatibleModeIsEnabled()) {
212:                                    compileError(
213:                                            "Parameter "
214:                                                    + withParam
215:                                                            .getVariableName()
216:                                                    + " is not declared in the called template",
217:                                            "XTSE0680");
218:                                }
219:                            }
220:                        }
221:                    }
222:                }
223:            }
224:
225:            private XSLTemplate findTemplate(int fingerprint)
226:                    throws XPathException {
227:
228:                XSLStylesheet stylesheet = getPrincipalStylesheet();
229:                List toplevel = stylesheet.getTopLevel();
230:
231:                // search for a matching template name, starting at the end in case of duplicates.
232:                // this also ensures we get the one with highest import precedence.
233:
234:                for (int i = toplevel.size() - 1; i >= 0; i--) {
235:                    if (toplevel.get(i) instanceof  XSLTemplate) {
236:                        XSLTemplate t = (XSLTemplate) toplevel.get(i);
237:                        if (t.getTemplateFingerprint() == fingerprint) {
238:                            return t;
239:                        }
240:                    }
241:                }
242:                compileError("No template exists named " + calledTemplateName,
243:                        "XTSE0650");
244:                return null;
245:            }
246:
247:            /**
248:             * Mark tail-recursive calls on templates and functions.
249:             * For most instructions, this does nothing.
250:             */
251:
252:            public void markTailCalls() {
253:                useTailRecursion = true;
254:            }
255:
256:            public Expression compile(Executable exec) throws XPathException {
257:                Template target = null;
258:                NamespaceResolver nsContext = null;
259:
260:                if (calledTemplateExpression == null) {
261:                    if (template == null) {
262:                        return null; // error already reported
263:                    }
264:                    target = template.getCompiledTemplate();
265:                } else {
266:                    //getPrincipalStyleSheet().setRequireRuntimeTemplateMap(true);
267:                    nsContext = makeNamespaceContext();
268:                }
269:
270:                CallTemplate call = new CallTemplate(target, useTailRecursion,
271:                        calledTemplateExpression, nsContext);
272:                call.setActualParameters(getWithParamInstructions(exec, false,
273:                        call), getWithParamInstructions(exec, true, call));
274:                ExpressionTool.makeParentReferences(call);
275:                return call;
276:            }
277:
278:        }
279:
280:        //
281:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
282:        // you may not use this file except in compliance with the License. You may obtain a copy of the
283:        // License at http://www.mozilla.org/MPL/
284:        //
285:        // Software distributed under the License is distributed on an "AS IS" basis,
286:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
287:        // See the License for the specific language governing rights and limitations under the License.
288:        //
289:        // The Original Code is: all this file.
290:        //
291:        // The Initial Developer of the Original Code is Michael H. Kay.
292:        //
293:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
294:        //
295:        // Contributor(s): none.
296:        //
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