/// <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); }