/**
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* $Id: mxChildChangeCodec.java,v 1.1 2012/11/15 13:26:47 gaudenz Exp $
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* Copyright (c) 2006, Gaudenz Alder
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*/
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package com.mxgraph.io;
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import java.util.Map;
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import org.w3c.dom.Element;
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import org.w3c.dom.Node;
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import com.mxgraph.model.mxGraphModel.mxChildChange;
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import com.mxgraph.model.mxICell;
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/**
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* Codec for mxChildChanges. This class is created and registered
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* dynamically at load time and used implicitely via mxCodec
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* and the mxCodecRegistry.
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*/
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public class mxChildChangeCodec extends mxObjectCodec
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{
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/**
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* Constructs a new model codec.
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*/
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public mxChildChangeCodec()
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{
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this(new mxChildChange(), new String[] { "model", "child",
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"previousIndex" }, new String[] { "parent", "previous" }, null);
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}
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/**
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* Constructs a new model codec for the given arguments.
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*/
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public mxChildChangeCodec(Object template, String[] exclude,
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String[] idrefs, Map<String, String> mapping)
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{
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super(template, exclude, idrefs, mapping);
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}
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/* (non-Javadoc)
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* @see com.mxgraph.io.mxObjectCodec#isReference(java.lang.Object, java.lang.String, java.lang.Object, boolean)
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*/
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@Override
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public boolean isReference(Object obj, String attr, Object value,
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boolean isWrite)
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{
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if (attr.equals("child") && obj instanceof mxChildChange
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&& (((mxChildChange) obj).getPrevious() != null || !isWrite))
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{
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return true;
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}
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return idrefs.contains(attr);
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}
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/* (non-Javadoc)
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* @see com.mxgraph.io.mxObjectCodec#afterEncode(com.mxgraph.io.mxCodec, java.lang.Object, org.w3c.dom.Node)
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*/
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@Override
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public Node afterEncode(mxCodec enc, Object obj, Node node)
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{
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if (obj instanceof mxChildChange)
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{
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mxChildChange change = (mxChildChange) obj;
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Object child = change.getChild();
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if (isReference(obj, "child", child, true))
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{
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// Encodes as reference (id)
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mxCodec.setAttribute(node, "child", enc.getId(child));
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}
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else
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{
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// At this point, the encoder is no longer able to know which cells
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// are new, so we have to encode the complete cell hierarchy and
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// ignore the ones that are already there at decoding time. Note:
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// This can only be resolved by moving the notify event into the
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// execute of the edit.
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enc.encodeCell((mxICell) child, node, true);
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}
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}
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return node;
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}
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/**
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* Reads the cells into the graph model. All cells are children of the root
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* element in the node.
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*/
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public Node beforeDecode(mxCodec dec, Node node, Object into)
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{
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if (into instanceof mxChildChange)
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{
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mxChildChange change = (mxChildChange) into;
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if (node.getFirstChild() != null
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&& node.getFirstChild().getNodeType() == Node.ELEMENT_NODE)
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{
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// Makes sure the original node isn't modified
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node = node.cloneNode(true);
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Node tmp = node.getFirstChild();
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change.setChild(dec.decodeCell(tmp, false));
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Node tmp2 = tmp.getNextSibling();
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tmp.getParentNode().removeChild(tmp);
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tmp = tmp2;
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while (tmp != null)
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{
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tmp2 = tmp.getNextSibling();
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if (tmp.getNodeType() == Node.ELEMENT_NODE)
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{
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// Ignores all existing cells because those do not need
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// to be re-inserted into the model. Since the encoded
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// version of these cells contains the new parent, this
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// would leave to an inconsistent state on the model
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// (ie. a parent change without a call to
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// parentForCellChanged).
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String id = ((Element) tmp).getAttribute("id");
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if (dec.lookup(id) == null)
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{
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dec.decodeCell(tmp, true);
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}
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}
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tmp.getParentNode().removeChild(tmp);
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tmp = tmp2;
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}
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}
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else
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{
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String childRef = ((Element) node).getAttribute("child");
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change.setChild((mxICell) dec.getObject(childRef));
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}
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}
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return node;
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}
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/* (non-Javadoc)
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* @see com.mxgraph.io.mxObjectCodec#afterDecode(com.mxgraph.io.mxCodec, org.w3c.dom.Node, java.lang.Object)
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*/
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@Override
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public Object afterDecode(mxCodec dec, Node node, Object obj)
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{
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if (obj instanceof mxChildChange)
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{
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mxChildChange change = (mxChildChange) obj;
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// Cells are encoded here after a complete transaction so the previous
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// parent must be restored on the cell for the case where the cell was
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// added. This is needed for the local model to identify the cell as a
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// new cell and register the ID.
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((mxICell) change.getChild()).setParent((mxICell) change
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.getPrevious());
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change.setPrevious(change.getParent());
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change.setPreviousIndex(change.getIndex());
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}
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return obj;
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}
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}
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