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

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


001:        package net.sf.saxon.expr;
002:
003:        import net.sf.saxon.om.NamePool;
004:        import net.sf.saxon.type.ItemType;
005:
006:        import javax.xml.transform.SourceLocator;
007:        import java.io.Serializable;
008:
009:        /**
010:         * A RoleLocator identifies the role in which an expression is used, for example as
011:         * the third argument of the concat() function. This information is stored in an
012:         * ItemChecker or CardinalityChecker so that good diagnostics can be
013:         * achieved when run-time type errors are detected.
014:         */
015:        public class RoleLocator implements  Serializable {
016:
017:            private int kind;
018:            private Object container;
019:            private int operand;
020:            private NamePool namePool;
021:            private String errorCode = "XPTY0004"; // default error code for type errors
022:            private SourceLocator sourceLocator;
023:
024:            public static final int FUNCTION = 0;
025:            public static final int BINARY_EXPR = 1;
026:            public static final int TYPE_OP = 2;
027:            public static final int VARIABLE = 3;
028:            public static final int INSTRUCTION = 4;
029:            public static final int FUNCTION_RESULT = 5;
030:            public static final int ORDER_BY = 6;
031:            public static final int TEMPLATE_RESULT = 7;
032:
033:            /**
034:             * Create information about the role of a subexpression within its parent expression
035:             * @param kind the kind of parent expression, e.g. a function call or a variable reference
036:             * @param container the name of the object in the parent expression, e.g. a function name or
037:             * instruction name. May be expressed either as a String or as an Integer nameCode in the name pool.
038:             * @param operand Ordinal position of this subexpression, e.g. the position of an argument in
039:             * @param namePool The name pool. Must be supplied if the second argument is an Integer namecode.
040:             * Otherwise, may be null.
041:             */
042:
043:            public RoleLocator(int kind, Object container, int operand,
044:                    NamePool namePool) {
045:                this .kind = kind;
046:                this .container = container;
047:                this .operand = operand;
048:                this .namePool = namePool;
049:            }
050:
051:            /**
052:             * Set the error code to be produced if a type error is detected
053:             * @param code The error code
054:             */
055:
056:            public void setErrorCode(String code) {
057:                if (code != null) {
058:                    this .errorCode = code;
059:                }
060:            }
061:
062:            /**
063:             * Get the error code to be produced if a type error is detected
064:             * @return code The error code
065:             */
066:
067:            public String getErrorCode() {
068:                return errorCode;
069:            }
070:
071:            /**
072:             * Set the source location
073:             */
074:
075:            public void setSourceLocator(SourceLocator locator) {
076:                // this is currently used only when type-checking literals,
077:                // which don't have any location information of their own
078:                if (locator instanceof  ExpressionLocation) {
079:                    this .sourceLocator = locator;
080:                } else {
081:                    this .sourceLocator = new ExpressionLocation(locator);
082:                }
083:                // the supplied value isn't saved because the locator may be an expression that
084:                // contains links back to the containing stylesheet, which causes the stylesheet
085:                // to remain in memory at run-time (and prevents stylesheet compilation)
086:            }
087:
088:            /**
089:             * Get the source location (if known - return null if not known)
090:             */
091:
092:            public SourceLocator getSourceLocator() {
093:                return sourceLocator;
094:            }
095:
096:            /**
097:             * Construct and return the error message indicating a type error
098:             * @return the constructed error message
099:             */
100:            public String getMessage() {
101:                String name;
102:                if (container instanceof  String) {
103:                    name = (String) container;
104:                } else {
105:                    if (namePool == null) {
106:                        name = "*unknown*";
107:                    } else {
108:                        name = namePool.getDisplayName(((Integer) container)
109:                                .intValue());
110:                    }
111:                }
112:
113:                switch (kind) {
114:                case FUNCTION:
115:                    return ordinal(operand + 1) + " argument of " + name + "()";
116:                case BINARY_EXPR:
117:                    return ordinal(operand + 1) + " operand of '" + name + '\'';
118:                case TYPE_OP:
119:                    return "value in '" + name + "' expression";
120:                case VARIABLE:
121:                    return "value of variable $" + name;
122:                case INSTRUCTION:
123:                    int slash = name.indexOf('/');
124:                    String attributeName = "";
125:                    if (slash >= 0) {
126:                        attributeName = name.substring(slash + 1);
127:                        name = name.substring(0, slash);
128:                    }
129:                    return '@' + attributeName + " attribute of " + name;
130:                case FUNCTION_RESULT:
131:                    return "result of function " + name + "()";
132:                case TEMPLATE_RESULT:
133:                    return "result of template " + name;
134:                case ORDER_BY:
135:                    return ordinal(operand + 1) + " sort key";
136:                default:
137:                    return "";
138:                }
139:            }
140:
141:            /**
142:             * Construct a full error message
143:             */
144:
145:            public String composeErrorMessage(ItemType requiredItemType,
146:                    ItemType suppliedItemType, NamePool pool) {
147:                return "Required item type of " + getMessage() + " is "
148:                        + requiredItemType.toString(pool)
149:                        + "; supplied value has item type "
150:                        + suppliedItemType.toString(pool);
151:            }
152:
153:            /**
154:             * Get the ordinal representation of a number (used to identify which argument of a function
155:             * is in error)
156:             * @param n the cardinal number
157:             * @return the ordinal representation
158:             */
159:            private static String ordinal(int n) {
160:                switch (n) {
161:                case 1:
162:                    return "first";
163:                case 2:
164:                    return "second";
165:                case 3:
166:                    return "third";
167:                default:
168:                    // we can live with 21th, 22th... How many functions have >20 arguments?
169:                    return n + "th";
170:                }
171:            }
172:        }
173:
174:        //
175:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
176:        // you may not use this file except in compliance with the License. You may obtain a copy of the
177:        // License at http://www.mozilla.org/MPL/
178:        //
179:        // Software distributed under the License is distributed on an "AS IS" basis,
180:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
181:        // See the License for the specific language governing rights and limitations under the License.
182:        //
183:        // The Original Code is: all this file.
184:        //
185:        // The Initial Developer of the Original Code is Michael H. Kay.
186:        //
187:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
188:        //
189:        // Contributor(s): none.
190:        //
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