149 lines
4.3 KiB
Java
149 lines
4.3 KiB
Java
/* FileIterator.java
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*
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* Created: 2011-10-10 (Year-Month-Day)
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* Character encoding: UTF-8
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*
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****************************************** LICENSE *******************************************
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*
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* Copyright (c) 2011 - 2013 XIAM Solutions B.V. (http://www.xiam.nl)
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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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package dorkbox.annotation;
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import java.io.File;
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import java.util.Deque;
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import java.util.LinkedList;
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import java.util.NoSuchElementException;
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/**
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* {@code FileIterator} enables iteration over all files in a directory and all its sub
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* directories.
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* <p/>
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* Usage:
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* <pre>
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* FileIterator iter = new FileIterator(new File("./src"));
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* File f;
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* while ((f = iter.next()) != null) {
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* // do something with f
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* assert f == iter.getCurrent();
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* }
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* </pre>
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*
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* @author <a href="mailto:rmuller@xiam.nl">Ronald K. Muller</a>
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* @since annotation-detector 3.0.0
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*/
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final
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class FileIterator {
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private final Deque<File> stack = new LinkedList<File>();
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private int rootCount;
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private File currentRoot;
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private File current;
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/**
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* Create a new {@code FileIterator} using the specified 'filesOrDirectories' as root.
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* <p/>
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* If 'filesOrDirectories' contains a file, the iterator just returns that single file.
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* If 'filesOrDirectories' contains a directory, all files in that directory
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* and its sub directories are returned (depth first).
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*
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* @param filesOrDirectories Zero or more {@link File} objects, which are iterated
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* in the specified order (depth first)
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*/
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FileIterator(final File... filesOrDirectories) {
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addReverse(filesOrDirectories);
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this.rootCount = this.stack.size();
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}
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/**
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* Return the last returned file or {@code null} if no more files are available.
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*
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* @see #next()
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*/
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File getFile() {
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return this.current;
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}
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File getRootFile() {
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return this.currentRoot;
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}
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/**
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* Relativize the absolute full (file) 'path' against the current root file.
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* <p/>
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* Example:<br/>
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* Let current root be "/path/to/dir".
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* Then {@code relativize("/path/to/dir/with/file.ext")} equals "with/file.ext" (without
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* leading '/').
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* <p/>
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* Note: the paths are not canonicalized!
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*/
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String relativize(final String path) {
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assert path.startsWith(this.currentRoot.getPath());
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return path.substring(this.currentRoot.getPath().length() + 1);
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}
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/**
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* Return {@code true} if the current file is one of the files originally
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* specified as one of the constructor file parameters, i.e. is a root file
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* or directory.
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*/
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boolean isRootFile() {
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if (this.current == null) {
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throw new NoSuchElementException();
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}
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return this.stack.size() < this.rootCount;
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}
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/**
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* Return the next {@link File} object or {@code null} if no more files are
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* available.
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*
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* @see #getFile()
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*/
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File next() {
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if (this.stack.isEmpty()) {
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this.current = null;
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return null;
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}
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else {
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this.current = this.stack.removeLast();
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if (this.current.isDirectory()) {
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if (this.stack.size() < this.rootCount) {
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this.rootCount = this.stack.size();
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this.currentRoot = this.current;
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}
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addReverse(this.current.listFiles());
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return next();
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}
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else {
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return this.current;
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}
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}
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}
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// private
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/**
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* Add the specified files in reverse order.
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*/
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private
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void addReverse(final File[] files) {
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for (int i = files.length - 1; i >= 0; --i) {
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this.stack.add(files[i]);
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}
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}
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}
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