问题描述
我正在尝试使用org.apache.poi.xwpf.usermodel.XWPFNumbering.getIdOfAbstractNum(XWPFAbstractNum abstractNum)
测试给定的abstractNum是否存在。通话结束于:
CTAbstractNumImpl(XmlComplexContentImpl).equal_to(XmlObject) line: 79
CTAbstractNumImpl(XmlObjectBase).valueEqualsImpl(XmlObject) line: 2393
CTAbstractNumImpl(XmlObjectBase).valueEquals(XmlObject) line: 2434
XWPFNumbering.getIdOfAbstractNum(XWPFAbstractNum) line: 222
...
不幸的是,org.apache.xmlbeans.impl.values.XmlComplexContentImpl.equal_to(XmlObject)
的实现不正确,并且始终返回true:
public boolean equal_to(XmlObject complexObject)
{
if (!_schemaType.equals(complexObject.schemaType()))
return false;
// BUGBUG: by-value structure comparison undone
return true;
}
是否有替代方法可以深入比较此类xml对象,或者找出抽象编号是否存在?
解决方法
幸运的是,这里有一个旧帖子,上面附有一个解决方案:http://mail-archives.apache.org/mod_mbox/xml-xmlbeans-user/200310.mbox/%3cOF7B942026.9900E6EE-ONCA256DC8.00064356@tmca.com.au%3e
这是稍作修改的内容,它允许通过调用方法lenientlyCompareTwoXmlStrings(XmlObject,XmlObject)
比较两个xml对象:
package bookmarks;
import org.apache.xmlbeans.XmlCursor;
import org.apache.xmlbeans.XmlObject;
import org.apache.xmlbeans.impl.common.QNameHelper;
import org.apache.xmlbeans.impl.common.XmlWhitespace;
/**
* This originates from an author called Dmitri.Coleba,see attached source here:
* http://mail-archives.apache.org/mod_mbox/xml-xmlbeans-user/200310.mbox/%3cOF7B942026.9900E6EE-ONCA256DC8.00064356@tmca.com.au%3e
*
* <p>
* Deep comparison of two xml objects.
*
* @author Markus Pscheidt
*
*/
public class XBeanCompare {
public static class Diagnostic {
private StringBuffer message = new StringBuffer();
void add(String s) {
message.append(s).append("\n");
}
public String toString() {
return message.toString();
}
}
/**
* Provides a utility to compare the xml inside the two strings.
*
* @return true if the xml inside the two strings is the same
*/
public static boolean lenientlyCompareTwoXmlStrings(XmlObject actualObj,XmlObject expectObj,Diagnostic diag) {
boolean match = true;
XmlCursor cur1 = actualObj.newCursor();
XmlCursor cur2 = expectObj.newCursor();
cur1.toFirstChild();
cur2.toFirstChild();
while (cur1.currentTokenType() != XmlCursor.TokenType.STARTDOC) {
if (!compareNamesAndAttributes(cur1,cur2,diag)) {
match = false;
}
boolean hasChildren1 = cur1.toFirstChild();
boolean hasChildren2 = cur2.toFirstChild();
if (hasChildren1 != hasChildren2) {
diag.add("Topology differs: one document has " + "children where the other does not ("
+ QNameHelper.pretty(cur1.getName()) + "," + QNameHelper.pretty(cur2.getName()) + ")."); // TODO:
// where?
match = false;
if (hasChildren1) {
cur1.toParent();
hasChildren1 = false;
}
if (hasChildren2) {
cur2.toParent();
hasChildren2 = false;
}
} else if (hasChildren1 == false) {
if (!wsCollapseEqual(cur1.getTextValue(),cur2.getTextValue())) {
diag.add("Value '" + cur1.getTextValue() + "' differs from value '" + cur2.getTextValue() + "'.");
match = false;
}
}
if (hasChildren1)
continue;
for (;;) {
boolean hasSibling1 = cur1.toNextSibling();
boolean hasSibling2 = cur2.toNextSibling();
if (hasSibling1 != hasSibling2) {
diag.add("Topology differs: one document has " + "siblings where the other does not."); // TODO:
// where?
hasSibling1 = false;
hasSibling2 = false;
}
if (hasSibling1)
break;
cur1.toParent();
cur2.toParent();
if (cur1.currentTokenType() == XmlCursor.TokenType.STARTDOC)
break;
}
}
return match;
}
private static boolean compareNamesAndAttributes(XmlCursor cur1,XmlCursor cur2,Diagnostic diag) {
if (!cur1.getName().equals(cur2.getName())) {
diag.add("Element names '" + QNameHelper.pretty(cur1.getName()) + "' and '"
+ QNameHelper.pretty(cur2.getName()) + "' do not match.");
return false;
}
String elemName = QNameHelper.pretty(cur1.getName());
boolean more = cur1.toFirstAttribute();
if (more) {
for (; more; more = cur1.toNextAttribute()) {
String text1 = cur1.getTextValue();
String text2 = cur2.getAttributeText(cur1.getName());
if (text2 == null) {
diag.add("Attribute '" + QNameHelper.pretty(cur1.getName()) + "' " + " of element '" + elemName
+ "' not present.");
return false;
}
if (!wsCollapseEqual(text1,text2)) {
diag.add("Attribute values for '" + QNameHelper.pretty(cur1.getName()) + "' " + " of element '"
+ elemName + "' don't match.");
return false;
}
}
cur1.toParent();
}
more = cur2.toFirstAttribute();
if (more) {
for (; more; more = cur2.toNextAttribute()) {
String text1 = cur1.getAttributeText(cur2.getName());
if (text1 == null) {
diag.add("Attribute '" + QNameHelper.pretty(cur2.getName()) + "' " + " of element '" + elemName
+ "' not present.");
return false;
}
}
cur2.toParent();
}
return true;
}
private static boolean wsCollapseEqual(String s1,String s2) {
String s1c = XmlWhitespace.collapse(s1);
String s2c = XmlWhitespace.collapse(s2);
return (s1c.equals(s2c));
}
}