forked from I2P_Developers/i2p.i2p
150 lines
4.6 KiB
Java
150 lines
4.6 KiB
Java
/*
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* Copyright (c) 2004 Ragnarok
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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package net.i2p.addressbook;
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import java.io.BufferedReader;
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import java.io.Closeable;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import java.util.Iterator;
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import java.util.Locale;
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import java.util.Map;
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import java.util.NoSuchElementException;
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import net.i2p.client.naming.HostTxtEntry;
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import net.i2p.data.DataHelper;
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/**
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* A class to iterate through a hosts.txt or config file without
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* reading the whole thing into memory.
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* Keys are always converted to lower case.
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*
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* Callers should iterate all the way through or call close()
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* to ensure the underlying stream is closed.
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*
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* This is not used for config files.
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* It is only used for subscriptions.
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*
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* @since 0.8.7, renamed from ConfigIterator in 0.9.26
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*/
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class HostTxtIterator implements Iterator<Map.Entry<String, HostTxtEntry>>, Closeable {
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private BufferedReader input;
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private MapEntry next;
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/**
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* A dummy iterator in which hasNext() is always false.
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*/
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public HostTxtIterator() {}
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/**
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* An iterator over the key/value pairs in the file.
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*/
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public HostTxtIterator(File file) throws IOException {
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FileInputStream fileStream = new FileInputStream(file);
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input = new BufferedReader(new InputStreamReader(fileStream, "UTF-8"));
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}
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public boolean hasNext() {
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if (input == null)
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return false;
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if (next != null)
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return true;
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try {
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String inputLine;
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while ((inputLine = input.readLine()) != null) {
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HostTxtEntry he = HostTxtParser.parse(inputLine, true);
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if (he == null)
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continue;
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next = new MapEntry(he.getName(), he);
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return true;
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}
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} catch (IOException ioe) {}
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try { input.close(); } catch (IOException ioe) {}
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input = null;
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next = null;
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return false;
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}
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/**
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* 'remove' entries will be returned with a null key,
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* and the value will contain a null name, null dest,
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* and non-null props.
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*/
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public Map.Entry<String, HostTxtEntry> next() {
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if (!hasNext())
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throw new NoSuchElementException();
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Map.Entry<String, HostTxtEntry> rv = next;
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next = null;
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return rv;
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}
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public void remove() {
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throw new UnsupportedOperationException();
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}
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public void close() {
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if (input != null) {
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try { input.close(); } catch (IOException ioe) {}
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}
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}
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/**
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* The object returned by the iterator.
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*/
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private static class MapEntry implements Map.Entry<String, HostTxtEntry> {
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private final String key;
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private final HostTxtEntry value;
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public MapEntry(String k, HostTxtEntry v) {
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key = k;
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value = v;
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}
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public String getKey() {
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return key;
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}
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public HostTxtEntry getValue() {
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return value;
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}
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public HostTxtEntry setValue(HostTxtEntry v) {
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throw new UnsupportedOperationException();
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}
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public int hashCode() {
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return key.hashCode() ^ value.hashCode();
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}
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public boolean equals(Object o) {
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if (!(o instanceof Map.Entry))
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return false;
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@SuppressWarnings("unchecked")
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Map.Entry<Object, Object> e = (Map.Entry<Object, Object>) o;
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return key.equals(e.getKey()) && value.equals(e.getValue());
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}
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}
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}
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