|
Java example source code file (DomainNameMapping.java)
This example Java source code file (DomainNameMapping.java) is included in the alvinalexander.com
"Java Source Code
Warehouse" project. The intent of this project is to help you "Learn
Java by Example" TM.
Learn more about this Java project at its project page.
The DomainNameMapping.java Java example source code
/*
* Copyright 2014 The Netty Project
*
* The Netty Project licenses this file to you 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 io.netty.util;
import io.netty.util.internal.StringUtil;
import java.net.IDN;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.Locale;
import java.util.Map;
import static io.netty.util.internal.ObjectUtil.checkNotNull;
import static io.netty.util.internal.StringUtil.commonSuffixOfLength;
/**
* Maps a domain name to its associated value object.
* <p>
* DNS wildcard is supported as hostname, so you can use {@code *.netty.io} to match both {@code netty.io}
* and {@code downloads.netty.io}.
* </p>
*/
public class DomainNameMapping<V> implements Mapping {
final V defaultValue;
private final Map<String, V> map;
private final Map<String, V> unmodifiableMap;
/**
* Creates a default, order-sensitive mapping. If your hostnames are in conflict, the mapping
* will choose the one you add first.
*
* @param defaultValue the default value for {@link #map(String)} to return when nothing matches the input
* @deprecated use {@link DomainNameMappingBuilder} to create and fill the mapping instead
*/
@Deprecated
public DomainNameMapping(V defaultValue) {
this(4, defaultValue);
}
/**
* Creates a default, order-sensitive mapping. If your hostnames are in conflict, the mapping
* will choose the one you add first.
*
* @param initialCapacity initial capacity for the internal map
* @param defaultValue the default value for {@link #map(String)} to return when nothing matches the input
* @deprecated use {@link DomainNameMappingBuilder} to create and fill the mapping instead
*/
@Deprecated
public DomainNameMapping(int initialCapacity, V defaultValue) {
this(new LinkedHashMap<String, V>(initialCapacity), defaultValue);
}
DomainNameMapping(Map<String, V> map, V defaultValue) {
this.defaultValue = checkNotNull(defaultValue, "defaultValue");
this.map = map;
unmodifiableMap = map != null ? Collections.unmodifiableMap(map)
: null;
}
/**
* Adds a mapping that maps the specified (optionally wildcard) host name to the specified output value.
* <p>
* <a href="http://en.wikipedia.org/wiki/Wildcard_DNS_record">DNS wildcard is supported as hostname.
* For example, you can use {@code *.netty.io} to match {@code netty.io} and {@code downloads.netty.io}.
* </p>
*
* @param hostname the host name (optionally wildcard)
* @param output the output value that will be returned by {@link #map(String)} when the specified host name
* matches the specified input host name
* @deprecated use {@link DomainNameMappingBuilder} to create and fill the mapping instead
*/
@Deprecated
public DomainNameMapping<V> add(String hostname, V output) {
map.put(normalizeHostname(checkNotNull(hostname, "hostname")), checkNotNull(output, "output"));
return this;
}
/**
* Simple function to match <a href="http://en.wikipedia.org/wiki/Wildcard_DNS_record">DNS wildcard.
*/
static boolean matches(String template, String hostName) {
if (template.startsWith("*.")) {
return template.regionMatches(2, hostName, 0, hostName.length())
|| commonSuffixOfLength(hostName, template, template.length() - 1);
}
return template.equals(hostName);
}
/**
* IDNA ASCII conversion and case normalization
*/
static String normalizeHostname(String hostname) {
if (needsNormalization(hostname)) {
hostname = IDN.toASCII(hostname, IDN.ALLOW_UNASSIGNED);
}
return hostname.toLowerCase(Locale.US);
}
private static boolean needsNormalization(String hostname) {
final int length = hostname.length();
for (int i = 0; i < length; i++) {
int c = hostname.charAt(i);
if (c > 0x7F) {
return true;
}
}
return false;
}
@Override
public V map(String hostname) {
if (hostname != null) {
hostname = normalizeHostname(hostname);
for (Map.Entry<String, V> entry : map.entrySet()) {
if (matches(entry.getKey(), hostname)) {
return entry.getValue();
}
}
}
return defaultValue;
}
/**
* Returns a read-only {@link Map} of the domain mapping patterns and their associated value objects.
*/
public Map<String, V> asMap() {
return unmodifiableMap;
}
@Override
public String toString() {
return StringUtil.simpleClassName(this) + "(default: " + defaultValue + ", map: " + map + ')';
}
}
Other Java examples (source code examples)
Here is a short list of links related to this Java DomainNameMapping.java source code file:
|