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

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


001:        package net.sf.saxon.value;
002:
003:        import net.sf.saxon.Err;
004:        import net.sf.saxon.expr.XPathContext;
005:        import net.sf.saxon.trans.DynamicError;
006:        import net.sf.saxon.trans.XPathException;
007:        import net.sf.saxon.type.*;
008:
009:        /**
010:         * A boolean XPath value
011:         */
012:
013:        public final class BooleanValue extends AtomicValue implements 
014:                Comparable {
015:            private boolean value;
016:
017:            /**
018:             * The boolean value TRUE
019:             */
020:            public static final BooleanValue TRUE = new BooleanValue(true);
021:            /**
022:             * The boolean value FALSE
023:             */
024:            public static final BooleanValue FALSE = new BooleanValue(false);
025:
026:            /**
027:             * Private Constructor: create a boolean value. Only two instances of this class are
028:             * ever created, one to represent true and one to represent false.
029:             * @param value the initial value, true or false
030:             */
031:
032:            private BooleanValue(boolean value) {
033:                this .value = value;
034:            }
035:
036:            /**
037:             * Factory method: get a BooleanValue
038:             *
039:             * @param value true or false, to determine which boolean value is
040:             *     required
041:             * @return the BooleanValue requested
042:             */
043:
044:            public static BooleanValue get(boolean value) {
045:                return (value ? TRUE : FALSE);
046:            }
047:
048:            /**
049:             * Convert a string to a boolean value, using the XML Schema rules (including
050:             * whitespace trimming)
051:             * @param s the input string
052:             * @return the relevant BooleanValue if validation succeeds; or an ErrorValue if not.
053:             */
054:
055:            public static AtomicValue fromString(CharSequence s) {
056:                s = trimWhitespace(s).toString();
057:                if (s.equals("true") || s.equals("1")) {
058:                    return TRUE;
059:                } else if (s.equals("false") || s.equals("0")) {
060:                    return FALSE;
061:                } else {
062:                    ValidationException err = new ValidationException(
063:                            "The string " + Err.wrap(s, Err.VALUE)
064:                                    + " cannot be cast to a boolean");
065:                    err.setErrorCode("FORG0001");
066:                    return new ValidationErrorValue(err);
067:                }
068:            }
069:
070:            /**
071:             * Get the value
072:             * @return true or false, the actual boolean value of this BooleanValue
073:             */
074:
075:            public boolean getBooleanValue() {
076:                return value;
077:            }
078:
079:            /**
080:             * Get the effective boolean value of this expression
081:             *
082:             * @param context dynamic evaluation context, not used in this
083:             *     implementation
084:             * @return the boolean value
085:             */
086:            public boolean effectiveBooleanValue(XPathContext context) {
087:                return value;
088:            }
089:
090:            /**
091:             * Convert to target data type
092:             * @param requiredType an integer identifying the required atomic type
093:             * @param context
094:             * @return an AtomicValue, a value of the required type
095:             */
096:
097:            public AtomicValue convertPrimitive(BuiltInAtomicType requiredType,
098:                    boolean validate, XPathContext context) {
099:                switch (requiredType.getPrimitiveType()) {
100:                case Type.BOOLEAN:
101:                case Type.ANY_ATOMIC:
102:                case Type.ITEM:
103:                    return this ;
104:                case Type.NUMBER:
105:                case Type.INTEGER:
106:                    return new IntegerValue(value ? 1 : 0);
107:                case Type.DECIMAL:
108:                case Type.FLOAT:
109:                case Type.DOUBLE:
110:                    return new IntegerValue(value ? 1 : 0).convertPrimitive(
111:                            requiredType, validate, context);
112:                case Type.STRING:
113:                    return new StringValue(getStringValueCS());
114:                case Type.UNTYPED_ATOMIC:
115:                    return new UntypedAtomicValue(getStringValueCS());
116:                default:
117:                    ValidationException err = new ValidationException(
118:                            "Cannot convert boolean to "
119:                                    + requiredType.getDisplayName());
120:                    err.setErrorCode("XPTY0004");
121:                    err.setIsTypeError(true);
122:                    return new ValidationErrorValue(err);
123:                }
124:            }
125:
126:            /**
127:             * Convert to string
128:             * @return "true" or "false"
129:             */
130:
131:            public String getStringValue() {
132:                return (value ? "true" : "false");
133:            }
134:
135:            /**
136:             * Determine the data type of the expression
137:             * @return Type.BOOLEAN,
138:             * @param th
139:             */
140:
141:            public ItemType getItemType(TypeHierarchy th) {
142:                return Type.BOOLEAN_TYPE;
143:            }
144:
145:            /**
146:             * Convert to Java object (for passing to external functions)
147:             *
148:             * @param target the Java class to which conversion is required
149:             * @exception XPathException if conversion is not possible or fails
150:             * @return An object of the specified Java class
151:             */
152:
153:            public Object convertToJava(Class target, XPathContext context)
154:                    throws XPathException {
155:                if (target == Object.class) {
156:                    return Boolean.valueOf(value);
157:                } else if (target.isAssignableFrom(BooleanValue.class)) {
158:                    return this ;
159:                } else if (target == boolean.class) {
160:                    return Boolean.valueOf(value);
161:                } else if (target == Boolean.class) {
162:                    return Boolean.valueOf(value);
163:                } else if (target == String.class
164:                        || target == CharSequence.class) {
165:                    return getStringValue();
166:                } else if (target == double.class) {
167:                    return new Double((double) (value ? 1 : 0));
168:                } else if (target == Double.class) {
169:                    return new Double((double) (value ? 1 : 0));
170:                } else if (target == float.class) {
171:                    return new Float((float) (value ? 1 : 0));
172:                } else if (target == Float.class) {
173:                    return new Float((float) (value ? 1 : 0));
174:                } else if (target == long.class) {
175:                    return new Long((long) (value ? 1 : 0));
176:                } else if (target == Long.class) {
177:                    return new Long((long) (value ? 1 : 0));
178:                } else if (target == int.class) {
179:                    return new Integer(value ? 1 : 0);
180:                } else if (target == Integer.class) {
181:                    return new Integer(value ? 1 : 0);
182:                } else if (target == short.class) {
183:                    return new Short((short) (value ? 1 : 0));
184:                } else if (target == Short.class) {
185:                    return new Short((short) (value ? 1 : 0));
186:                } else if (target == byte.class) {
187:                    return new Byte((byte) (value ? 1 : 0));
188:                } else if (target == Byte.class) {
189:                    return new Byte((byte) (value ? 1 : 0));
190:                } else if (target == char.class) {
191:                    return new Character(value ? '1' : '0');
192:                } else if (target == Character.class) {
193:                    return new Character(value ? '1' : '0');
194:                } else {
195:                    Object o = super .convertToJava(target, context);
196:                    if (o == null) {
197:                        DynamicError err = new DynamicError(
198:                                "Conversion of boolean to " + target.getName()
199:                                        + " is not supported");
200:                        err.setXPathContext(context);
201:                        err.setErrorCode("SAXON:0000");
202:                        throw err;
203:                    }
204:                    return o;
205:                }
206:            }
207:
208:            /**
209:             * Compare the value to another boolean value
210:             *
211:             * @throws ClassCastException if the other value is not a BooleanValue
212:             *     (the parameter is declared as Object to satisfy the Comparable
213:             *     interface)
214:             * @param other The other boolean value
215:             * @return -1 if this one is the lower, 0 if they are equal, +1 if this
216:             *     one is the higher. False is considered to be less than true.
217:             */
218:
219:            public int compareTo(Object other) {
220:                if (!(other instanceof  BooleanValue)) {
221:                    throw new ClassCastException(
222:                            "Boolean values are not comparable to "
223:                                    + other.getClass());
224:                }
225:                if (this .value == ((BooleanValue) other).value)
226:                    return 0;
227:                if (this .value)
228:                    return +1;
229:                return -1;
230:            }
231:
232:            /**
233:             * Determine whether two boolean values are equal
234:             *
235:             * @param other the value to be compared to this value
236:             * @return true if the other value is a boolean value and is equal to this
237:             *      value
238:             */
239:            public boolean equals(Object other) {
240:                if (!(other instanceof  BooleanValue)) {
241:                    throw new ClassCastException(
242:                            "Boolean values are not comparable to "
243:                                    + other.getClass());
244:                }
245:                return (this .value == ((BooleanValue) other).value);
246:            }
247:
248:            /**
249:             * Get a hash code for comparing two BooleanValues
250:             *
251:             * @return the hash code
252:             */
253:            public int hashCode() {
254:                return (value ? 0 : 1);
255:            }
256:
257:            /**
258:             * Diagnostic display of this value as a string
259:             * @return a string representation of this value: "true()" or "false()"
260:             */
261:            public String toString() {
262:                return getStringValue() + "()";
263:            }
264:        }
265:
266:        //
267:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
268:        // you may not use this file except in compliance with the License. You may obtain a copy of the
269:        // License at http://www.mozilla.org/MPL/
270:        //
271:        // Software distributed under the License is distributed on an "AS IS" basis,
272:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
273:        // See the License for the specific language governing rights and limitations under the License.
274:        //
275:        // The Original Code is: all this file.
276:        //
277:        // The Initial Developer of the Original Code is Michael H. Kay.
278:        //
279:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
280:        //
281:        // Contributor(s): none.
282:        //
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