/// <summary>
/// After processing by ExpandXPath, a step can be of these forms:
/// <ul>
/// <li>qualName - A top level property or struct field.
/// </summary>
/// <remarks>
/// After processing by ExpandXPath, a step can be of these forms:
/// <ul>
/// <li>qualName - A top level property or struct field.
/// <li>[index] - An element of an array.
/// <li>[last()] - The last element of an array.
/// <li>[qualName="value"] - An element in an array of structs, chosen by a field value.
/// <li>[?qualName="value"] - An element in an array, chosen by a qualifier value.
/// <li>?qualName - A general qualifier.
/// </ul>
/// Find the appropriate child node, resolving aliases, and optionally creating nodes.
/// </remarks>
/// <param name="parentNode">the node to start to start from</param>
/// <param name="nextStep">the xpath segment</param>
/// <param name="createNodes"></param>
/// <returns>returns the found or created XMPPath node</returns>
/// <exception cref="Com.Adobe.Xmp.XMPException"></exception>
private static XMPNode FollowXPathStep(XMPNode parentNode, XMPPathSegment nextStep, bool createNodes)
{
XMPNode nextNode = null;
int index = 0;
int stepKind = nextStep.GetKind();
if (stepKind == XMPPath.StructFieldStep)
{
nextNode = FindChildNode(parentNode, nextStep.GetName(), createNodes);
}
else
{
if (stepKind == XMPPath.QualifierStep)
{
nextNode = FindQualifierNode(parentNode, Sharpen.Runtime.Substring(nextStep.GetName(), 1), createNodes);
}
else
{
// This is an array indexing step. First get the index, then get the node.
if (!parentNode.GetOptions().IsArray())
{
throw new XMPException("Indexing applied to non-array", XMPErrorConstants.Badxpath);
}
if (stepKind == XMPPath.ArrayIndexStep)
{
index = FindIndexedItem(parentNode, nextStep.GetName(), createNodes);
}
else
{
if (stepKind == XMPPath.ArrayLastStep)
{
index = parentNode.GetChildrenLength();
}
else
{
if (stepKind == XMPPath.FieldSelectorStep)
{
string[] result = Utils.SplitNameAndValue(nextStep.GetName());
string fieldName = result[0];
string fieldValue = result[1];
index = LookupFieldSelector(parentNode, fieldName, fieldValue);
}
else
{
if (stepKind == XMPPath.QualSelectorStep)
{
string[] result = Utils.SplitNameAndValue(nextStep.GetName());
string qualName = result[0];
string qualValue = result[1];
index = LookupQualSelector(parentNode, qualName, qualValue, nextStep.GetAliasForm());
}
else
{
throw new XMPException("Unknown array indexing step in FollowXPathStep", XMPErrorConstants.Internalfailure);
}
}
}
}
if (1 <= index && index <= parentNode.GetChildrenLength())
{
nextNode = parentNode.GetChild(index);
}
}
}
return(nextNode);
}
/// <summary>
/// After processing by ExpandXPath, a step can be of these forms:
/// <ul>
/// <li>qualName - A top level property or struct field.
/// </summary>
/// <remarks>
/// After processing by ExpandXPath, a step can be of these forms:
/// <ul>
/// <li>qualName - A top level property or struct field.
/// <li>[index] - An element of an array.
/// <li>[last()] - The last element of an array.
/// <li>[qualName="value"] - An element in an array of structs, chosen by a field value.
/// <li>[?qualName="value"] - An element in an array, chosen by a qualifier value.
/// <li>?qualName - A general qualifier.
/// </ul>
/// Find the appropriate child node, resolving aliases, and optionally creating nodes.
/// </remarks>
/// <param name="parentNode">the node to start to start from</param>
/// <param name="nextStep">the xpath segment</param>
/// <param name="createNodes"></param>
/// <returns>returns the found or created XMPPath node</returns>
/// <exception cref="iText.Kernel.XMP.XMPException"></exception>
private static XMPNode FollowXPathStep(XMPNode parentNode, XMPPathSegment nextStep
, bool createNodes)
{
XMPNode nextNode = null;
int index = 0;
int stepKind = nextStep.GetKind();
if (stepKind == XMPPath.STRUCT_FIELD_STEP)
{
nextNode = FindChildNode(parentNode, nextStep.GetName(), createNodes);
}
else
{
if (stepKind == XMPPath.QUALIFIER_STEP)
{
nextNode = FindQualifierNode(parentNode, nextStep.GetName().Substring(1), createNodes
);
}
else
{
// This is an array indexing step. First get the index, then get the node.
if (!parentNode.GetOptions().IsArray())
{
throw new XMPException("Indexing applied to non-array", XMPError.BADXPATH);
}
if (stepKind == XMPPath.ARRAY_INDEX_STEP)
{
index = FindIndexedItem(parentNode, nextStep.GetName(), createNodes);
}
else
{
if (stepKind == XMPPath.ARRAY_LAST_STEP)
{
index = parentNode.GetChildrenLength();
}
else
{
if (stepKind == XMPPath.FIELD_SELECTOR_STEP)
{
String[] result = Utils.SplitNameAndValue(nextStep.GetName());
String fieldName = result[0];
String fieldValue = result[1];
index = LookupFieldSelector(parentNode, fieldName, fieldValue);
}
else
{
if (stepKind == XMPPath.QUAL_SELECTOR_STEP)
{
String[] result = Utils.SplitNameAndValue(nextStep.GetName());
String qualName = result[0];
String qualValue = result[1];
index = LookupQualSelector(parentNode, qualName, qualValue, nextStep.GetAliasForm
());
}
else
{
throw new XMPException("Unknown array indexing step in FollowXPathStep", XMPError
.INTERNALFAILURE);
}
}
}
}
if (1 <= index && index <= parentNode.GetChildrenLength())
{
nextNode = parentNode.GetChild(index);
}
}
}
return(nextNode);
}
