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A processor for parsing, validating, serializing and manipulating XML, written in Java
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.xerces.impl.dv.xs;
import java.security.AccessController;
import java.security.PrivilegedAction;
import org.apache.xerces.impl.dv.InvalidDatatypeValueException;
import org.apache.xerces.impl.dv.ValidationContext;
import org.apache.xerces.util.XMLChar;
/**
* All primitive types plus ID/IDREF/ENTITY/INTEGER are derived from this abstract
* class. It provides extra information XSSimpleTypeDecl requires from each
* type: allowed facets, converting String to actual value, check equality,
* comparison, etc.
*
* @xerces.internal
*
* @author Neeraj Bajaj, Sun Microsystems, inc.
* @author Sandy Gao, IBM
*
* @version $Id$
*/
public abstract class TypeValidator {
private static final boolean USE_CODE_POINT_COUNT_FOR_STRING_LENGTH = AccessController.doPrivileged(new PrivilegedAction() {
public Object run() {
try {
return Boolean.getBoolean("org.apache.xerces.impl.dv.xs.useCodePointCountForStringLength") ? Boolean.TRUE : Boolean.FALSE;
}
catch (SecurityException ex) {}
return Boolean.FALSE;
}}) == Boolean.TRUE;
// convert a string to an actual value. for example,
// for number types (decimal, double, float, and types derived from them),
// get the BigDecimal, Double, Flout object.
// for some types (string and derived), they just return the string itself
public abstract Object getActualValue(String content, ValidationContext context)
throws InvalidDatatypeValueException;
// for ID/IDREF/ENTITY types, do some extra checking after the value is
// checked to be valid with respect to both lexical representation and
// facets
public void checkExtraRules(Object value, ValidationContext context) throws InvalidDatatypeValueException {
}
// the following methods might not be supported by every DV.
// but XSSimpleTypeDecl should know which type supports which methods,
// and it's an *internal* error if a method is called on a DV that
// doesn't support it.
//order constants
public static final short LESS_THAN = -1;
public static final short EQUAL = 0;
public static final short GREATER_THAN = 1;
public static final short INDETERMINATE = 2;
// where there is distinction between identity and equality, this method
// will be overwritten
// checks whether the two values are identical; for ex, this distinguishes
// -0.0 from 0.0
public boolean isIdentical (Object value1, Object value2) {
return value1.equals(value2);
}
// check the order relation between the two values
// the parameters are in compiled form (from getActualValue)
public int compare(Object value1, Object value2) {
return -1;
}
// get the length of the value
// the parameters are in compiled form (from getActualValue)
public int getDataLength(Object value) {
if (value instanceof String) {
final String str = (String)value;
if (!USE_CODE_POINT_COUNT_FOR_STRING_LENGTH) {
return str.length();
}
return getCodePointLength(str);
}
return -1;
}
// get the number of digits of the value
// the parameters are in compiled form (from getActualValue)
public int getTotalDigits(Object value) {
return -1;
}
// get the number of fraction digits of the value
// the parameters are in compiled form (from getActualValue)
public int getFractionDigits(Object value) {
return -1;
}
// Returns the length of the string in Unicode code points.
private int getCodePointLength(String value) {
// Count the number of surrogate pairs, and subtract them from
// the total length.
final int len = value.length();
int surrogatePairCount = 0;
for (int i = 0; i < len - 1; ++i) {
if (XMLChar.isHighSurrogate(value.charAt(i))) {
if (XMLChar.isLowSurrogate(value.charAt(++i))) {
++surrogatePairCount;
}
else {
--i;
}
}
}
return len - surrogatePairCount;
}
// check whether the character is in the range 0x30 ~ 0x39
public static final boolean isDigit(char ch) {
return ch >= '0' && ch <= '9';
}
// if the character is in the range 0x30 ~ 0x39, return its int value (0~9),
// otherwise, return -1
public static final int getDigit(char ch) {
return isDigit(ch) ? ch - '0' : -1;
}
//get the number of precision of the value
//the parameters are in compiled form (from getActualValue)
public int getPrecision(Object value){
return 0;
}
//whether this value has a precision. false indicate it's a special value.
public boolean hasPrecision(Object value){
return false;
}
public boolean hasTimeZone(Object value){
return false;
}
} // interface TypeValidator