package jnpf.fileStorage.dms;
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import org.w3c.dom.*;
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import java.io.IOException;
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import java.util.*;
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/** Rejects tracked edits in a copied OOXML part before the formal file is stored. */
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final class DmsDocxRevisionRejector {
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private DmsDocxRevisionRejector() { }
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private static final Set<String> PROPERTIES = Set.of("rPrChange", "pPrChange", "sectPrChange", "tblPrChange",
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"tblPrExChange", "tblGridChange", "trPrChange", "tcPrChange");
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private static final Set<String> RANGES = Set.of("moveFromRangeStart", "moveFromRangeEnd", "moveToRangeStart", "moveToRangeEnd",
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"customXmlInsRangeStart", "customXmlInsRangeEnd", "customXmlDelRangeStart", "customXmlDelRangeEnd",
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"customXmlMoveFromRangeStart", "customXmlMoveFromRangeEnd", "customXmlMoveToRangeStart", "customXmlMoveToRangeEnd");
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static boolean reject(Document document) throws IOException {
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return visit(document.getDocumentElement());
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}
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private static boolean word(Node node) {
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return "http://schemas.openxmlformats.org/wordprocessingml/2006/main".equals(node.getNamespaceURI())
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|| "http://purl.oclc.org/ooxml/wordprocessingml/main".equals(node.getNamespaceURI());
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}
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private static List<Element> children(Node node) {
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List<Element> out = new ArrayList<>();
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for (Node child = node.getFirstChild(); child != null; child = child.getNextSibling())
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if (child instanceof Element e) out.add(e);
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return out;
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}
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private static Element child(Node node, String name) {
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return children(node).stream().filter(e -> word(e) && name.equals(e.getLocalName())).findFirst().orElse(null);
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}
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private static void remove(Node node) { node.getParentNode().removeChild(node); }
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private static void unwrap(Node node) {
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Node parent = node.getParentNode();
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while (node.hasChildNodes()) parent.insertBefore(node.getFirstChild(), node);
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parent.removeChild(node);
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}
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private static boolean visit(Element element) throws IOException {
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boolean changed = false;
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// Restore the old property snapshot before visiting it; current properties are discarded.
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for (Element change : children(element)) {
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if (word(change) && PROPERTIES.contains(change.getLocalName())) {
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Element previous = child(change, element.getLocalName());
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if (previous == null) throw new IOException("修订缺少原属性快照: " + change.getLocalName());
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Node restored = previous.cloneNode(true);
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element.getParentNode().replaceChild(restored, element);
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visit((Element) restored);
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return true;
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}
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}
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if (word(element)) {
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String name = element.getLocalName();
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if ("tr".equals(name) || "tc".equals(name)) {
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Element props = child(element, "tr".equals(name) ? "trPr" : "tcPr");
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String inserted = "tr".equals(name) ? "ins" : "cellIns";
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if (props != null && child(props, inserted) != null) { remove(element); return true; }
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}
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if ("p".equals(name)) {
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Element props = child(element, "pPr");
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Element runProps = props == null ? null : child(props, "rPr");
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Element insertedMark = runProps == null ? null : child(runProps, "ins");
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Element movedMark = runProps == null ? null : child(runProps, "moveTo");
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if (insertedMark != null || movedMark != null) {
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Node next = element.getNextSibling();
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while (next != null && !(next instanceof Element)) next = next.getNextSibling();
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if (!(next instanceof Element following) || !word(following) || !"p".equals(following.getLocalName()))
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throw new IOException("无法安全拒绝跨结构的段落标记修订");
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if (insertedMark != null) remove(insertedMark);
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if (movedMark != null) remove(movedMark);
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// Reject the inserted/moved-to paragraph break: concatenate into the following paragraph,
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// whose paragraph properties describe the retained original paragraph mark.
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Element followingProps = child(following, "pPr");
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Node anchor = followingProps == null ? following.getFirstChild() : followingProps.getNextSibling();
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for (Node n = element.getFirstChild(); n != null;) {
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Node nextChild = n.getNextSibling();
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if (n != props) following.insertBefore(n, anchor);
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n = nextChild;
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}
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remove(element);
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return true;
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}
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}
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if ("cellMerge".equals(name) || "numberingChange".equals(name) || name.startsWith("customXml") && RANGES.contains(name))
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throw new IOException("暂不支持安全拒绝此结构修订: " + name);
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if (RANGES.contains(name)) { remove(element); return true; }
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if ("ins".equals(name) || "moveTo".equals(name) || "cellIns".equals(name)) {
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remove(element); return true;
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}
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if ("del".equals(name) || "moveFrom".equals(name) || "cellDel".equals(name)) {
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if ("trPr".equals(element.getParentNode().getLocalName()) || "rPr".equals(element.getParentNode().getLocalName())
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|| "tcPr".equals(element.getParentNode().getLocalName())) { remove(element); return true; }
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for (Element nested : children(element)) visit(nested);
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unwrap(element); return true;
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}
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if ("delText".equals(name) || "delInstrText".equals(name)) {
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String local = "delText".equals(name) ? "t" : "instrText";
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element.getOwnerDocument().renameNode(element, element.getNamespaceURI(),
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element.getPrefix() == null ? local : element.getPrefix() + ":" + local);
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changed = true;
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}
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}
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for (Element nested : children(element)) {
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if (nested.getParentNode() == element) changed |= visit(nested);
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}
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return changed;
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}
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}
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