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/*
* Copyright 2000-2009 JetBrains s.r.o.
*
* 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.
*/
package com.intellij.compiler.impl;
import com.intellij.openapi.util.Pair;
import com.intellij.openapi.util.io.FileUtil;
import org.jetbrains.annotations.Nullable;
import java.io.File;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
/**
* @author Eugene Zhuravlev
* Date: Apr 6, 2009
*/
public class OutputPathFinder {
private final Node myRoot = new Node("");
public OutputPathFinder(Set<File> outputDirs) {
for (File dir : outputDirs) {
final String path = FileUtil.toSystemIndependentName(dir.getPath());
Node node = myRoot;
int idx = path.startsWith("/")? 1 : 0;
int slashIndex = path.indexOf('/', idx);
for (; slashIndex >= 0; slashIndex = path.indexOf('/', idx)) {
final String name = path.substring(idx, slashIndex);
node = node.addChild(name);
idx = slashIndex + 1;
}
if (idx < path.length()) {
node = node.addChild(path.substring(idx));
}
node.setData(path);
}
}
@Nullable
public String lookupOutputPath(File outputFile) {
return lookupOutputPath(outputFile.getPath());
}
@Nullable
public String lookupOutputPath(String filePath) {
final String path = FileUtil.toSystemIndependentName(filePath);
Node node = myRoot;
int idx = path.startsWith("/")? 1 : 0;
return findOutputPath(path, idx, node);
}
private static @Nullable String findOutputPath(final String path, int idx, Node node) {
while (true) {
final int slashIndex = path.indexOf('/', idx);
final String name = slashIndex < idx? path.substring(idx) : path.substring(idx, slashIndex);
node = node.getChild(name);
if (node == null) {
return null;
}
if (node.isOutputRoot()) {
if (node.hasChildren() && slashIndex > idx) {
final String candidate = findOutputPath(path, slashIndex + 1, node);
if (candidate != null) {
return candidate;
}
}
return node.getData();
}
if (slashIndex < 0) {
return null; // end of path reached
}
idx = slashIndex + 1;
}
}
private static class Node {
private final String myName;
@Nullable
private Object myChildren; // either a Node or a Map<String, Node> or a String or a Pair<String, Node or NodeMap>
private Node(String name) {
myName = name;
}
public String getName() {
return myName;
}
public boolean isOutputRoot() {
return myChildren instanceof String || myChildren instanceof Pair;
}
public boolean hasChildren() {
return myChildren instanceof Map || myChildren instanceof Pair;
}
@Nullable
public String getData() {
if (myChildren instanceof String) {
return (String)myChildren;
}
if (myChildren instanceof Pair) {
//noinspection unchecked
return (String)((Pair)myChildren).first;
}
return null;
}
public void setData(String path) {
if (myChildren != null) {
if (myChildren instanceof String) {
myChildren = path;
}
else {
myChildren = new Pair(path, myChildren instanceof Pair? ((Pair)myChildren).second : myChildren);
}
}
else {
myChildren = path;
}
}
public Node addChild(String childName) {
if (myChildren == null) {
final Node node = new Node(childName);
myChildren = node;
return node;
}
if (myChildren instanceof String) {
final Node node = new Node(childName);
myChildren = new Pair(myChildren, node);
return node;
}
final Map<String, Node> map;
if (myChildren instanceof Map) {
map = (Map<String, Node>)myChildren;
}
else if (myChildren instanceof Node) {
final Node existingChild = (Node)myChildren;
myChildren = map = new HashMap<String, Node>();
map.put(existingChild.getName(), existingChild);
}
else { // myChildren is a Pair
Object children = ((Pair)myChildren).second;
if (children instanceof Map) {
map = (Map<String, Node>)children;
}
else {
final Node existingChild = (Node)children;
myChildren = new Pair(((Pair)myChildren).first, map = new HashMap<String, Node>());
map.put(existingChild.getName(), existingChild);
}
}
Node node = map.get(childName);
if (node == null) {
map.put(childName, node = new Node(childName));
}
return node;
}
@Nullable
public Node getChild(String childName) {
final Object children = myChildren instanceof Pair? ((Pair)myChildren).second : myChildren;
if (children instanceof Node) {
final Node childNode = (Node)children;
return childName.equals(childNode.getName())? childNode : null;
}
if (children instanceof Map) {
return ((Map<String, Node>)myChildren).get(childName);
}
return null;
}
}
public static void main(String[] args) {
final Set<File> set = new HashSet<File>();
set.add(new File("/a/b/c"));
set.add(new File("a/b/d"));
set.add(new File("a/b/e"));
set.add(new File("/a/b/f/g"));
set.add(new File("/a/b/f/g/zzz"));
final OutputPathFinder finder = new OutputPathFinder(set);
System.out.println(finder.lookupOutputPath(new File("a/b")));
System.out.println(finder.lookupOutputPath(new File("a/b/c/dir1/dir2/File.class")));
System.out.println(finder.lookupOutputPath(new File("a/b/d/dir1/dir2/File.class")));
System.out.println(finder.lookupOutputPath(new File("a/b/jjjjj/dir1/dir2/File.class")));
System.out.println(finder.lookupOutputPath(new File("a/b/e/File.class")));
System.out.println(finder.lookupOutputPath(new File("a/b/File.class")));
System.out.println(finder.lookupOutputPath(new File("/a/b/f/g/File.class")));
System.out.println(finder.lookupOutputPath(new File("/a/b/f/g/ttt/yy/File.class")));
System.out.println(finder.lookupOutputPath(new File("/a/b/f/g/zzz/File.class")));
System.out.println(finder.lookupOutputPath(new File("/a/b/f/g/zzz/mmm/ttt/File.class")));
}
}
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