jaxp/src/javax/xml/xpath/XPathException.java
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@@ -24,21 +24,27 @@
*/
package javax.xml.xpath;
import java.io.PrintWriter;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.io.ObjectStreamField;
/**
* <code>XPathException</code> represents a generic XPath exception.</p>
*
* @author <a href="Norman.Walsh@Sun.com">Norman Walsh</a>
* @author <a href="mailto:Jeff.Suttor@Sun.COM">Jeff Suttor</a>
* @since 1.5
*/
public class XPathException extends Exception {
- private final Throwable cause;
+ private static final ObjectStreamField[] serialPersistentFields = {
+ new ObjectStreamField( "cause", Throwable.class )
+ };
/**
* <p>Stream Unique Identifier.</p>
*/
private static final long serialVersionUID = -1837080260374986980L;
@@ -60,11 +66,10 @@
public XPathException(String message) {
super(message);
if ( message == null ) {
throw new NullPointerException ( "message can't be null");
}
- this.cause = null;
}
/**
* <p>Constructs a new <code>XPathException</code>
* with the specified <code>cause</code>.</p>
@@ -75,12 +80,11 @@
* @param cause The cause.
*
* @throws NullPointerException if <code>cause</code> is <code>null</code>.
*/
public XPathException(Throwable cause) {
- super();
- this.cause = cause;
+ super(cause);
if ( cause == null ) {
throw new NullPointerException ( "cause can't be null");
}
}
@@ -88,11 +92,48 @@
* <p>Get the cause of this XPathException.</p>
*
* @return Cause of this XPathException.
*/
public Throwable getCause() {
- return cause;
+ return super.getCause();
+ }
+
+ /**
+ * Writes "cause" field to the stream.
+ * The cause is got from the parent class.
+ *
+ * @param out stream used for serialization.
+ * @throws IOException thrown by <code>ObjectOutputStream</code>
+ *
+ */
+ private void writeObject(ObjectOutputStream out)
+ throws IOException
+ {
+ ObjectOutputStream.PutField fields = out.putFields();
+ fields.put("cause", (Throwable) super.getCause());
+ out.writeFields();
+ }
+
+ /**
+ * Reads the "cause" field from the stream.
+ * And initializes the "cause" if it wasn't
+ * done before.
+ *
+ * @param in stream used for deserialization
+ * @throws IOException thrown by <code>ObjectInputStream</code>
+ * @throws ClassNotFoundException thrown by <code>ObjectInputStream</code>
+ */
+ private void readObject(ObjectInputStream in)
+ throws IOException, ClassNotFoundException
+ {
+ ObjectInputStream.GetField fields = in.readFields();
+ Throwable scause = (Throwable) fields.get("cause", null);
+ try {
+ if (super.getCause() == null && scause != null)
+ super.initCause(scause);
+ } catch(IllegalStateException e) {
+ }
}
/**
* <p>Print stack trace to specified <code>PrintStream</code>.</p>
*