| /******************************************************************************* |
| * Copyright (c) 2012, 2014 Ericsson |
| * Copyright (c) 2010, 2011 École Polytechnique de Montréal |
| * Copyright (c) 2010, 2011 Alexandre Montplaisir <alexandre.montplaisir@gmail.com> |
| * |
| * All rights reserved. This program and the accompanying materials are |
| * made available under the terms of the Eclipse Public License v1.0 which |
| * accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| *******************************************************************************/ |
| |
| package org.eclipse.tracecompass.internal.statesystem.core; |
| |
| import java.io.PrintWriter; |
| import java.util.Collections; |
| import java.util.LinkedHashMap; |
| import java.util.LinkedList; |
| import java.util.Map; |
| |
| import com.google.common.collect.ImmutableList; |
| |
| /** |
| * An Attribute is a "node" in the Attribute Tree. It represents a smallest |
| * unit of the model which can be in a particular state at a given time. |
| * |
| * It is abstract, as different implementations can provide different ways to |
| * access sub-attributes |
| * |
| * @author alexmont |
| * |
| */ |
| public final class Attribute { |
| |
| private final Attribute parent; |
| private final String name; |
| private final int quark; |
| |
| /** The sub-attributes (<basename, attribute>) of this attribute */ |
| private final Map<String, Attribute> subAttributes; |
| |
| /** |
| * Constructor |
| * |
| * @param parent |
| * The parent attribute of this one. Can be 'null' to represent |
| * this attribute is the root node of the tree. |
| * @param name |
| * Base name of this attribute |
| * @param quark |
| * The integer representation of this attribute |
| */ |
| public Attribute(Attribute parent, String name, int quark) { |
| this.parent = parent; |
| this.quark = quark; |
| this.name = name; |
| this.subAttributes = Collections.synchronizedMap(new LinkedHashMap<String, Attribute>()); |
| } |
| |
| // ------------------------------------------------------------------------ |
| // Accessors |
| // ------------------------------------------------------------------------ |
| |
| /** |
| * Get the quark (integer representation) of this attribute. |
| * |
| * @return The quark of this attribute |
| */ |
| public int getQuark() { |
| return quark; |
| } |
| |
| /** |
| * Get the name of this attribute. |
| * |
| * @return The name of this attribute |
| */ |
| public String getName() { |
| return name; |
| } |
| |
| /** |
| * Get the list of child attributes below this one. |
| * |
| * @return The child attributes. |
| */ |
| public Iterable<Attribute> getSubAttributes() { |
| return ImmutableList.copyOf(subAttributes.values()); |
| } |
| |
| /** |
| * Get the matching quark for a given path-of-strings |
| * |
| * @param path |
| * The path we are looking for, *relative to this node*. |
| * @return The matching quark, or -1 if that attribute does not exist. |
| */ |
| public int getSubAttributeQuark(String... path) { |
| return this.getSubAttributeQuark(path, 0); |
| } |
| |
| /** |
| * Other method to search through the attribute tree, but instead of |
| * returning the matching quark we return the AttributeTreeNode object |
| * itself. It can then be used as new "root node" for faster queries on the |
| * tree. |
| * |
| * @param path |
| * The target path, *relative to this node* |
| * @return The Node object matching the last element in the path, or "null" |
| * if that attribute does not exist. |
| */ |
| public Attribute getSubAttributeNode(String... path) { |
| return this.getSubAttributeNode(path, 0); |
| } |
| |
| /** |
| * "Inner" part of the previous public method, which is used recursively. To |
| * avoid having to copy sub-arrays to pass down, we just track where we are |
| * at with the index parameter. It uses getSubAttributeNode(), whose |
| * implementation is left to the derived classes. |
| */ |
| private int getSubAttributeQuark(String[] path, int index) { |
| Attribute targetNode = this.getSubAttributeNode(path, index); |
| if (targetNode == null) { |
| return -1; |
| } |
| return targetNode.getQuark(); |
| } |
| |
| /** |
| * Get the parent attribute of this attribute |
| * |
| * @return The parent attribute |
| */ |
| public Attribute getParentAttribute() { |
| return this.parent; |
| } |
| |
| /** |
| * Get the parent quark of this attribute |
| * |
| * @return The quark of the parent attribute |
| */ |
| public int getParentAttributeQuark() { |
| return this.parent.getQuark(); |
| } |
| |
| /* The methods how to access children are left to derived classes */ |
| |
| /** |
| * Add a sub-attribute to this attribute |
| * |
| * @param newSubAttribute The new attribute to add |
| */ |
| public void addSubAttribute(Attribute newSubAttribute) { |
| if (newSubAttribute == null || newSubAttribute.getName() == null) { |
| throw new IllegalArgumentException(); |
| } |
| subAttributes.put(newSubAttribute.getName(), newSubAttribute); |
| } |
| |
| /** |
| * Get a sub-attribute from this node's sub-attributes |
| * |
| * @param path |
| * The *full* path to the attribute |
| * @param index |
| * The index in 'path' where this attribute is located |
| * (indicating where to start searching). |
| * @return The requested attribute |
| */ |
| private Attribute getSubAttributeNode(String[] path, int index) { |
| final Attribute nextNode = subAttributes.get(path[index]); |
| |
| if (nextNode == null) { |
| /* We don't have the expected child => the attribute does not exist */ |
| return null; |
| } |
| if (index == path.length - 1) { |
| /* It's our job to process this request */ |
| return nextNode; |
| } |
| |
| /* Pass on the rest of the path to the relevant child */ |
| return nextNode.getSubAttributeNode(path, index + 1); |
| } |
| |
| /** |
| * Return a String array composed of the full (absolute) path representing |
| * this attribute |
| * |
| * @return |
| */ |
| private String[] getFullAttribute() { |
| LinkedList<String> list = new LinkedList<>(); |
| Attribute curNode = this; |
| |
| /* Add recursive parents to the list, but stop at the root node */ |
| while (curNode.parent != null) { |
| list.addFirst(curNode.getName()); |
| curNode = curNode.parent; |
| } |
| |
| return list.toArray(new String[0]); |
| } |
| |
| /** |
| * Return the absolute path of this attribute, as a single slash-separated |
| * String. |
| * |
| * @return The full name of this attribute |
| */ |
| public String getFullAttributeName() { |
| String[] array = this.getFullAttribute(); |
| StringBuffer buf = new StringBuffer(); |
| |
| for (int i = 0; i < array.length - 1; i++) { |
| buf.append(array[i]); |
| buf.append('/'); |
| } |
| buf.append(array[array.length - 1]); |
| return buf.toString(); |
| } |
| |
| @Override |
| public String toString() { |
| return getFullAttributeName() + " (" + quark + ')'; //$NON-NLS-1$ |
| } |
| |
| private int curDepth; |
| |
| private void attributeNodeToString(PrintWriter writer, Attribute currentNode) { |
| writer.println(currentNode.getName() + " (" + currentNode.quark + ')'); //$NON-NLS-1$ |
| curDepth++; |
| |
| for (Attribute nextNode : currentNode.getSubAttributes()) { |
| /* Skip printing 'null' entries */ |
| if (nextNode == null) { |
| continue; |
| } |
| for (int j = 0; j < curDepth - 1; j++) { |
| writer.print(" "); //$NON-NLS-1$ |
| } |
| writer.print(" "); //$NON-NLS-1$ |
| attributeNodeToString(writer, nextNode); |
| } |
| curDepth--; |
| return; |
| } |
| |
| /** |
| * Debugging method to print the contents of this attribute |
| * |
| * @param writer |
| * PrintWriter where to write the information |
| */ |
| public void debugPrint(PrintWriter writer) { |
| /* Only used for debugging, shouldn't be externalized */ |
| writer.println("------------------------------"); //$NON-NLS-1$ |
| writer.println("Attribute tree: (quark)\n"); //$NON-NLS-1$ |
| curDepth = 0; |
| attributeNodeToString(writer, this); |
| writer.print('\n'); |
| } |
| } |