package net.sf.saxon.tree;
/**
* System IDs are not held in nodes in the tree, because they are usually the same
* for a whole document.
* This class provides a map from element sequence numbers to System IDs: it is
* linked to the root node of the tree.
* Note that the System ID is not necessarily the same as the Base URI. The System ID relates
* to the external entity in which a node was physically located; this provides a default for
* the Base URI, but this may be modified by specifying an xml:base attribute
*
* @author Michael H. Kay
*/
public class SystemIdMap {
private int[] sequenceNumbers;
private String[] uris;
private int allocated;
public SystemIdMap() {
sequenceNumbers = new int[10];
uris = new String[10];
allocated = 0;
}
/**
* Set the system ID corresponding to a given sequence number
*/
public void setSystemId(int sequence, String uri) {
// ignore it if same as previous
if (allocated>0 && uri.equals(uris[allocated-1])) {
return;
}
if (sequenceNumbers.length <= allocated + 1) {
int[] s = new int[allocated * 2];
String[] u = new String[allocated * 2];
System.arraycopy(sequenceNumbers, 0, s, 0, allocated);
System.arraycopy(uris, 0, u, 0, allocated);
sequenceNumbers = s;
uris = u;
}
sequenceNumbers[allocated] = sequence;
uris[allocated] = uri;
allocated++;
}
/**
* Get the system ID corresponding to a given sequence number
*/
public String getSystemId(int sequence) {
if (allocated==0) return null;
// could use a binary chop, but it's not important
for (int i=1; i<allocated; i++) {
if (sequenceNumbers[i] > sequence) {
return uris[i-1];
}
}
return uris[allocated-1];
}
}
//
// The contents of this file are subject to the Mozilla Public License Version 1.0 (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.mozilla.org/MPL/
//
// Software distributed under the License is distributed on an "AS IS" basis,
// WITHOUT WARRANTY OF ANY KIND, either express or implied.
// See the License for the specific language governing rights and limitations under the License.
//
// The Original Code is: all this file.
//
// The Initial Developer of the Original Code is Michael H. Kay.
//
// Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
//
// Contributor(s): none.
//
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