--- /dev/null
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP : APPC
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Copyright (C) 2017 Amdocs
+ * =============================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * ECOMP is a trademark and service mark of AT&T Intellectual Property.
+ * ============LICENSE_END=========================================================
+ */
+
+
+
+package org.onap.appc.util;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Properties;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+/**
+ * This class is used to assemble properties that are defined using a structured name into groups, and allow them to be
+ * processed as sets of definitions.
+ * <p>
+ * For example, a structured name uses a dotted-notation, like "provider.name". Further, the nodes of the structured
+ * name may be serialized using a suffix ordinal number (e.g., "provider1.name"). These structured properties form a
+ * hierarchical name space where the names are grouped together and can be retrieved as a set.
+ * </p>
+ *
+ */
+
+public class StructuredPropertyHelper {
+
+ /**
+ * This method scans the properties object for all properties that match the root name and constructs a list of
+ * structured property node graphs that represents the namespaces of the properties.
+ * <p>
+ * For example, assume that there are structured properties of the form "provider1.name", "provider2.name",
+ * "provider3.name", and so forth. There may also be other subordinate properties as well (e.g., "provider1.type").
+ * This method would construct a list of graphs of nodes, where each node represents one value of the structured
+ * name. The roots would be the values "provider1", "provider2", "provider3", and so forth. The values of the
+ * subordinate nodes would be the second, third, and so forth name nodes of the compound name. The value of the
+ * property is associated with nodes that are representative of the leaf of the name space.
+ * </p>
+ *
+ * @param properties
+ * The properties to be processed
+ * @param prefix
+ * The prefix of the root structured property name
+ * @return The node graph of the properties
+ */
+ public static List<Node> getStructuredProperties(Properties properties, String prefix) {
+ List<Node> roots = new ArrayList<>();
+
+ for (String name : properties.stringPropertyNames()) {
+ if (name.startsWith(prefix)) {
+ String value = properties.getProperty(name);
+ processNamespace(roots, name, value);
+ }
+ }
+
+ return roots;
+ }
+
+ /**
+ * This method recursively walks the name space of the structured property and constructs the node graph to
+ * represent the property
+ *
+ * @param nodes
+ * The collection of nodes for the current level of the name space
+ * @param propertyName
+ * The name of the node
+ * @param value
+ * The value, if any
+ * @return The node for this level in the namespace
+ */
+ @SuppressWarnings("nls")
+ private static Node processNamespace(List<Node> nodes, String propertyName, String value) {
+ String[] tokens = propertyName.split("\\.", 2);
+ String nodeName = normalizeNodeName(tokens[0]);
+
+ Node namespaceNode = null;
+ for (Node node : nodes) {
+ if (node.getName().equals(nodeName)) {
+ namespaceNode = node;
+ break;
+ }
+ }
+ if (namespaceNode == null) {
+ namespaceNode = new Node();
+ namespaceNode.setName(nodeName);
+ nodes.add(namespaceNode);
+ }
+
+ if (tokens.length == 1 || tokens[1] == null || tokens[1].length() == 0) {
+ namespaceNode.setValue(value);
+ } else {
+ processNamespace(namespaceNode.getChildren(), tokens[1], value);
+ }
+
+ return namespaceNode;
+ }
+
+ /**
+ * This method normalizes a node name of the structured property name by removing leading and trailing whitespace,
+ * and by converting any ordinal position to a simple expression without leading zeroes.
+ *
+ * @param token
+ * The token to be normalized
+ * @return The normalized name, or null if the token was null;
+ */
+ @SuppressWarnings("nls")
+ private static String normalizeNodeName(String token) {
+ if (token == null) {
+ return null;
+ }
+
+ StringBuffer buffer = new StringBuffer(token.trim());
+ Pattern pattern = Pattern.compile("([^0-9]+)([0-9]*)");
+ Matcher matcher = pattern.matcher(buffer);
+ if (matcher.matches()) {
+ String nameRoot = matcher.group(1);
+ String ordinal = matcher.group(2);
+ if (ordinal != null && ordinal.length() > 0) {
+ int i = Integer.parseInt(ordinal);
+ buffer.setLength(0);
+ buffer.append(nameRoot);
+ buffer.append(Integer.toString(i));
+ }
+ }
+ return buffer.toString();
+ }
+
+ /**
+ * This class represents a node in the structured property name space
+ *
+ */
+ public static class Node implements Comparable<Node> {
+
+ /**
+ * The name of the structured property node
+ */
+ private String name;
+
+ /**
+ * If the node is a leaf, then the value of the property
+ */
+ private String value;
+
+ /**
+ * If the node is not a leaf, then the sub-nodes of the property
+ */
+ private List<Node> children;
+
+ /**
+ * @return the value of name
+ */
+ public String getName() {
+ return name;
+ }
+
+ /**
+ * @param name
+ * the value for name
+ */
+ public void setName(String name) {
+ this.name = name;
+ }
+
+ /**
+ * @return the value of value
+ */
+ public String getValue() {
+ return value;
+ }
+
+ /**
+ * @param value
+ * the value for value
+ */
+ public void setValue(String value) {
+ this.value = value;
+ }
+
+ /**
+ * @return the value of children
+ */
+ public List<Node> getChildren() {
+ if (children == null) {
+ children = new ArrayList<>();
+ }
+ return children;
+ }
+
+ /**
+ * @see java.lang.Object#hashCode()
+ */
+ @Override
+ public int hashCode() {
+ return name.hashCode() + (value != null ? value.hashCode() : children.hashCode());
+ }
+
+ /**
+ * @see java.lang.Object#equals(java.lang.Object)
+ */
+ @Override
+ public boolean equals(Object obj) {
+ if (obj == null)
+ return false;
+ if (this.getClass() != obj.getClass())
+ return false;
+
+ Node other = (Node) obj;
+ boolean result = name.equals(other.name);
+
+ if (value == null) {
+ result &= other.value == null;
+ } else {
+ result &= value.equals(other.value);
+ }
+ if (children == null) {
+ result &= other.children == null;
+ } else {
+ result &= children.equals(other.children);
+ }
+ return result;
+ }
+
+ /**
+ * @see java.lang.Object#toString()
+ */
+ @SuppressWarnings("nls")
+ @Override
+ public String toString() {
+ if (value != null) {
+ return String.format("%s = %s", name, value);
+ }
+ return String.format("%s.%s", name, children.toString());
+ }
+
+ @Override
+ public int compareTo(StructuredPropertyHelper.Node o) {
+ return name.compareTo(o.name);
+ }
+ }
+}
Code Review / appc.git / blobdiff