Added xstream handiling for Wikipedia upload/download

[phpeclipse.git] / archive / net.sourceforge.phpeclipse.wiki / src / net / sourceforge / phpeclipse / wiki / xml / PageConverter.java

diff --git a/archive/net.sourceforge.phpeclipse.wiki/src/net/sourceforge/phpeclipse/wiki/xml/PageConverter.java b/archive/net.sourceforge.phpeclipse.wiki/src/net/sourceforge/phpeclipse/wiki/xml/PageConverter.java
new file mode 100644 (file)
index 0000000..5bd9206
--- /dev/null
+++ b/archive/net.sourceforge.phpeclipse.wiki/src/net/sourceforge/phpeclipse/wiki/xml/PageConverter.java
@@ -0,0 +1,101 @@
+package net.sourceforge.phpeclipse.wiki.xml;
+
+import java.util.ArrayList;
+
+import com.thoughtworks.xstream.alias.ClassMapper;
+import com.thoughtworks.xstream.converters.ConversionException;
+import com.thoughtworks.xstream.converters.Converter;
+import com.thoughtworks.xstream.converters.MarshallingContext;
+import com.thoughtworks.xstream.converters.UnmarshallingContext;
+import com.thoughtworks.xstream.io.HierarchicalStreamReader;
+import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
+
+/**
+ *  Converts a Page object from and to xml
+ */
+public class PageConverter implements Converter {
+  protected ClassMapper classMapper;
+
+  protected String classAttributeIdentifier;
+
+  public PageConverter(ClassMapper classMapper, String classAttributeIdentifier) {
+    this.classMapper = classMapper;
+    this.classAttributeIdentifier = classAttributeIdentifier;
+  }
+
+  public boolean canConvert(Class type) {
+    return type.equals(Page.class);
+  }
+
+  public void marshal(Object source, HierarchicalStreamWriter writer, MarshallingContext context) {
+    Page page = (Page) source;
+    writer.startNode("title");
+    writer.setValue(page.title);
+    writer.endNode();
+
+    ArrayList list = page.listOfRevisions;
+    for (int i = 0; i < list.size(); i++) {
+      Object item = list.get(i);
+      writeItem(item, context, writer);
+    }
+  }
+
+  public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext context) {
+    Page page = (Page) createPage(context.getRequiredType());
+    reader.moveDown();
+    page.title = (String) reader.getValue();
+    reader.moveUp();
+    populatePage(reader, context, page);
+    return page;
+  }
+
+  protected void populatePage(HierarchicalStreamReader reader, UnmarshallingContext context, Page page) {
+    ArrayList list = page.listOfRevisions;
+    if (list == null) {
+      page.listOfRevisions = new ArrayList();
+      list = page.listOfRevisions;
+    }
+    while (reader.hasMoreChildren()) {
+      reader.moveDown();
+      Object item = readItem(reader, context, page);
+      list.add(item);
+      reader.moveUp();
+    }
+  }
+
+  protected void writeItem(Object item, MarshallingContext context, HierarchicalStreamWriter writer) {
+    // PUBLISHED API METHOD! If changing signature, ensure backwards compatability.
+    if (item == null) {
+      // todo: this is duplicated in TreeMarshaller.start()
+      writer.startNode(classMapper.lookupName(ClassMapper.Null.class));
+      writer.endNode();
+    } else {
+      writer.startNode(classMapper.lookupName(item.getClass()));
+      context.convertAnother(item);
+      writer.endNode();
+    }
+  }
+
+  protected Object readItem(HierarchicalStreamReader reader, UnmarshallingContext context, Object current) {
+    // PUBLISHED API METHOD! If changing signature, ensure backwards compatability.
+    String classAttribute = reader.getAttribute(classAttributeIdentifier);
+    Class type;
+    if (classAttribute == null) {
+      type = classMapper.lookupType(reader.getNodeName());
+    } else {
+      type = classMapper.lookupType(classAttribute);
+    }
+    return context.convertAnother(current, type);
+  }
+
+  protected Object createPage(Class type) {
+    Class defaultType = classMapper.lookupDefaultType(type);
+    try {
+      return defaultType.newInstance();
+    } catch (InstantiationException e) {
+      throw new ConversionException("Cannot instantiate " + defaultType.getName(), e);
+    } catch (IllegalAccessException e) {
+      throw new ConversionException("Cannot instantiate " + defaultType.getName(), e);
+    }
+  }
+}
\ No newline at end of file