Source Code Cross Referenced for ProcessingInstruction.java in  » XML » XPath-Saxon » net » sf » saxon » instruct » 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.instruct 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package net.sf.saxon.instruct;
002:
003:        import net.sf.saxon.Err;
004:        import net.sf.saxon.Configuration;
005:        import net.sf.saxon.event.SequenceReceiver;
006:        import net.sf.saxon.expr.*;
007:        import net.sf.saxon.om.NamePool;
008:        import net.sf.saxon.pattern.NodeKindTest;
009:        import net.sf.saxon.style.StandardNames;
010:        import net.sf.saxon.trans.DynamicError;
011:        import net.sf.saxon.trans.XPathException;
012:        import net.sf.saxon.type.ItemType;
013:        import net.sf.saxon.type.TypeHierarchy;
014:        import net.sf.saxon.value.SequenceType;
015:        import net.sf.saxon.value.Whitespace;
016:
017:        import java.io.PrintStream;
018:        import java.util.ArrayList;
019:        import java.util.Iterator;
020:
021:        /**
022:         * An xsl:processing-instruction element in the stylesheet.
023:         */
024:
025:        public class ProcessingInstruction extends SimpleNodeConstructor {
026:
027:            private Expression name;
028:
029:            /**
030:             * Create an xsl:processing-instruction instruction
031:             * @param name the expression used to compute the name of the generated
032:             * processing-instruction
033:             */
034:
035:            public ProcessingInstruction(Expression name) {
036:                this .name = name;
037:                adoptChildExpression(name);
038:            }
039:
040:            /**
041:             * Get the name of this instruction for diagnostic and tracing purposes
042:             * @return the string "xsl:processing-instruction"
043:             */
044:
045:            public int getInstructionNameCode() {
046:                return StandardNames.XSL_PROCESSING_INSTRUCTION;
047:            }
048:
049:            public ItemType getItemType(TypeHierarchy th) {
050:                return NodeKindTest.PROCESSING_INSTRUCTION;
051:            }
052:
053:            public int getCardinality() {
054:                return StaticProperty.EXACTLY_ONE;
055:            }
056:
057:            public Expression simplify(StaticContext env) throws XPathException {
058:                name = name.simplify(env);
059:                return super .simplify(env);
060:            }
061:
062:            public void localTypeCheck(StaticContext env,
063:                    ItemType contextItemType) throws XPathException {
064:                name = name.typeCheck(env, contextItemType);
065:                adoptChildExpression(name);
066:
067:                RoleLocator role = new RoleLocator(RoleLocator.INSTRUCTION,
068:                        "processing-instruction:name", 0, null);
069:                role.setSourceLocator(this );
070:                name = TypeChecker.staticTypeCheck(name,
071:                        SequenceType.SINGLE_STRING, false, role, env);
072:                adoptChildExpression(name);
073:            }
074:
075:            public int getDependencies() {
076:                return name.getDependencies() | super .getDependencies();
077:            }
078:
079:            public Iterator iterateSubExpressions() {
080:                ArrayList list = new ArrayList(6);
081:                if (select != null) {
082:                    list.add(select);
083:                }
084:                //        if (separator != null && !(separator instanceof StringValue)) {
085:                //            list.add(separator);
086:                //        }
087:                list.add(name);
088:                return list.iterator();
089:            }
090:
091:            /**
092:             * Offer promotion for subexpressions. The offer will be accepted if the subexpression
093:             * is not dependent on the factors (e.g. the context item) identified in the PromotionOffer.
094:             * By default the offer is not accepted - this is appropriate in the case of simple expressions
095:             * such as constant values and variable references where promotion would give no performance
096:             * advantage. This method is always called at compile time.
097:             *
098:             * @param offer details of the offer, for example the offer to move
099:             *     expressions that don't depend on the context to an outer level in
100:             *     the containing expression
101:             * @exception XPathException if any error is detected
102:             */
103:
104:            protected void promoteInst(PromotionOffer offer)
105:                    throws XPathException {
106:                name = doPromotion(name, offer);
107:                super .promoteInst(offer);
108:            }
109:
110:            /**
111:             * Process this instruction, that is, produce a processing-instruction node in the
112:             * result sequence.
113:             * @param context the dynamic context of this transformation
114:             * @throws XPathException if any non-recoverable dynamic error occurs
115:             * @return always returns null in this implementation
116:             */
117:
118:            public TailCall processLeavingTail(XPathContext context)
119:                    throws XPathException {
120:                String expandedName = evaluateName(context);
121:                if (expandedName != null) {
122:                    String data = expandChildren(context).toString();
123:                    data = checkContent(data, context);
124:                    SequenceReceiver out = context.getReceiver();
125:                    out
126:                            .processingInstruction(expandedName, data,
127:                                    locationId, 0);
128:                }
129:                return null;
130:            }
131:
132:            /**
133:             * Check the content of the node, and adjust it if necessary
134:             *
135:             * @param data the supplied content
136:             * @return the original content, unless adjustments are needed
137:             * @throws net.sf.saxon.trans.DynamicError
138:             *          if the content is invalid
139:             */
140:
141:            protected String checkContent(String data, XPathContext context)
142:                    throws DynamicError {
143:                int hh;
144:                while ((hh = data.indexOf("?>")) >= 0) {
145:                    if (isXSLT(context)) {
146:                        data = data.substring(0, hh + 1) + ' '
147:                                + data.substring(hh + 1);
148:                    } else {
149:                        DynamicError err = new DynamicError(
150:                                "Invalid characters (?>) in processing instruction",
151:                                this );
152:                        err.setErrorCode("XQDY0026");
153:                        err.setXPathContext(context);
154:                        context.getController().recoverableError(err);
155:                    }
156:                }
157:                if (context.getController().getExecutable().getHostLanguage() == Configuration.XQUERY) {
158:                    data = Whitespace.removeLeadingWhitespace(data).toString();
159:                }
160:                return data;
161:            }
162:
163:            protected int evaluateNameCode(XPathContext context)
164:                    throws XPathException {
165:                String expandedName = evaluateName(context);
166:                if (expandedName == null) {
167:                    throw new SkipInstructionException("");
168:                }
169:                return context.getNamePool().allocate("", "", expandedName);
170:            }
171:
172:            /**
173:             * Evaluate the name of the processing instruction. If it is invalid, report a recoverable error
174:             * and return null.
175:             * @param context
176:             * @return the name of the processing instruction (an NCName), or null, incicating an invalid name
177:             * @throws XPathException if evaluation fails, or if the recoverable error is treated as fatal
178:             */
179:            private String evaluateName(XPathContext context)
180:                    throws XPathException {
181:                String expandedName = name.evaluateAsString(context);
182:                if (!(context.getConfiguration().getNameChecker()
183:                        .isValidNCName(expandedName))) {
184:                    DynamicError e = new DynamicError(
185:                            "Processing instruction name "
186:                                    + Err.wrap(expandedName)
187:                                    + " is not a valid NCName");
188:                    e.setXPathContext(context);
189:                    e.setErrorCode((isXSLT(context) ? "XTDE0890" : "XQDY0041"));
190:                    throw dynamicError(this , e, context);
191:                }
192:                if (expandedName.equalsIgnoreCase("xml")) {
193:                    DynamicError e = new DynamicError(
194:                            "Processing instructions cannot be named 'xml' in any combination of upper/lower case");
195:                    e.setXPathContext(context);
196:                    e.setErrorCode((isXSLT(context) ? "XTDE0890" : "XQDY0064"));
197:                    throw dynamicError(this , e, context);
198:                }
199:                return expandedName;
200:            }
201:
202:            public void display(int level, NamePool pool, PrintStream out) {
203:                out.println(ExpressionTool.indent(level)
204:                        + "processing-instruction");
205:                name.display(level + 1, pool, out);
206:                super .display(level + 1, pool, out);
207:            }
208:
209:        }
210:
211:        //
212:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
213:        // you may not use this file except in compliance with the License. You may obtain a copy of the
214:        // License at http://www.mozilla.org/MPL/
215:        //
216:        // Software distributed under the License is distributed on an "AS IS" basis,
217:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
218:        // See the License for the specific language governing rights and limitations under the License.
219:        //
220:        // The Original Code is: all this file.
221:        //
222:        // The Initial Developer of the Original Code is Michael H. Kay.
223:        //
224:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
225:        //
226:        // Contributor(s): none.
227:        //
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