/*
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* Copyright 2011-17 Fraunhofer ISE, energy & meteo Systems GmbH and other contributors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package org.openmuc.openiec61850;
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import java.util.Iterator;
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import java.util.LinkedList;
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import java.util.List;
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/**
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* ObjectReference syntax: LDName/LNName.DOName[.Name[. ...]]
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*
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*/
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public final class ObjectReference implements Iterable<String> {
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private final String objectReference;
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private List<String> nodeNames = null;
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// if the ObjectReference contains an array index this variable will save
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// its position in the nodeNames List
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private int arrayIndexPosition = -1;
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public ObjectReference(String objectReference) {
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if (objectReference == null || objectReference.isEmpty()) {
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throw new IllegalArgumentException();
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}
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this.objectReference = objectReference;
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}
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/**
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* @return Returns name part of the reference.
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*/
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public String getName() {
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if (nodeNames == null) {
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parseForNameList();
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}
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return nodeNames.get(nodeNames.size() - 1);
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}
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@Override
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public String toString() {
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return objectReference;
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}
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public boolean isLogicalDeviceRef() {
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if (nodeNames == null) {
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parseForNameList();
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}
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return (nodeNames.size() == 1);
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}
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public boolean isLogicalNodeRef() {
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if (nodeNames == null) {
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parseForNameList();
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}
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return (nodeNames.size() == 2);
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}
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public boolean isDataRef() {
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if (nodeNames == null) {
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parseForNameList();
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}
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return (nodeNames.size() > 2);
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}
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int getArrayIndexPosition() {
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if (nodeNames == null) {
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parseForNameList();
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}
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return arrayIndexPosition;
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}
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@Override
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public Iterator<String> iterator() {
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if (nodeNames == null) {
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parseForNameList();
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}
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return nodeNames.iterator();
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}
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public String get(int i) {
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if (nodeNames == null) {
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parseForNameList();
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}
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return nodeNames.get(i);
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}
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public int size() {
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if (nodeNames == null) {
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parseForNameList();
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}
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return nodeNames.size();
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}
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private void parseForNameList() {
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nodeNames = new LinkedList<>();
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int lastDelim = -1;
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int nextDelim = objectReference.indexOf('/');
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if (nextDelim == -1) {
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nodeNames.add(objectReference.substring(lastDelim + 1, objectReference.length()));
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return;
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}
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nodeNames.add(objectReference.substring(lastDelim + 1, nextDelim));
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int dotIndex = -1;
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int openingbracketIndex = -1;
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int closingbracketIndex = -1;
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while (true) {
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lastDelim = nextDelim;
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if (dotIndex == -1) {
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dotIndex = objectReference.indexOf('.', lastDelim + 1);
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if (dotIndex == -1) {
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dotIndex = objectReference.length();
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}
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}
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if (openingbracketIndex == -1) {
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openingbracketIndex = objectReference.indexOf('(', lastDelim + 1);
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if (openingbracketIndex == -1) {
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openingbracketIndex = objectReference.length();
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}
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}
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if (closingbracketIndex == -1) {
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closingbracketIndex = objectReference.indexOf(')', lastDelim + 1);
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if (closingbracketIndex == -1) {
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closingbracketIndex = objectReference.length();
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}
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}
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if (dotIndex == openingbracketIndex && dotIndex == closingbracketIndex) {
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nodeNames.add(objectReference.substring(lastDelim + 1, objectReference.length()));
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return;
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}
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if (dotIndex < openingbracketIndex && dotIndex < closingbracketIndex) {
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nextDelim = dotIndex;
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dotIndex = -1;
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}
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else if (openingbracketIndex < dotIndex && openingbracketIndex < closingbracketIndex) {
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nextDelim = openingbracketIndex;
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openingbracketIndex = -1;
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arrayIndexPosition = nodeNames.size() + 1;
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}
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else if (closingbracketIndex < dotIndex && closingbracketIndex < openingbracketIndex) {
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if (closingbracketIndex == (objectReference.length() - 1)) {
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nodeNames.add(objectReference.substring(lastDelim + 1, closingbracketIndex));
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return;
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}
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nextDelim = closingbracketIndex + 1;
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closingbracketIndex = -1;
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dotIndex = -1;
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nodeNames.add(objectReference.substring(lastDelim + 1, nextDelim - 1));
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continue;
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}
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nodeNames.add(objectReference.substring(lastDelim + 1, nextDelim));
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}
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}
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}
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