org.cyberneko.html.HTMLEntities Maven / Gradle / Ivy
/*
* Copyright 2002-2009 Andy Clark, Marc Guillemot
*
* 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 org.cyberneko.html;
import java.io.IOException;
import java.io.InputStream;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
/**
* Pre-defined HTML entities.
*
* @author Andy Clark
*
* @version $Id: HTMLEntities.java,v 1.5 2005/02/14 03:56:54 andyc Exp $
*/
public class HTMLEntities {
//
// Constants
//
/** Entities. */
protected static final Map ENTITIES;
/** Reverse mapping from characters to names. */
protected static final IntProperties SEITITNE = new IntProperties();
//
// Static initialization
//
static {
final Properties props = new Properties();
// load entities
load0(props, "res/HTMLlat1.properties");
load0(props, "res/HTMLspecial.properties");
load0(props, "res/HTMLsymbol.properties");
load0(props, "res/XMLbuiltin.properties");
// store reverse mappings
final Enumeration keys = props.propertyNames();
while (keys.hasMoreElements()) {
final String key = (String)keys.nextElement();
final String value = props.getProperty(key);
if (value.length() == 1) {
final int ivalue = value.charAt(0);
SEITITNE.put(ivalue, key);
}
}
ENTITIES = Collections.unmodifiableMap(new HashMap(props));
}
//
// Public static methods
//
/**
* Returns the character associated to the given entity name, or
* -1 if the name is not known.
*/
public static int get(String name) {
String value = (String)ENTITIES.get(name);
return value != null ? value.charAt(0) : -1;
} // get(String):char
/**
* Returns the name associated to the given character or null if
* the character is not known.
*/
public static String get(int c) {
return SEITITNE.get(c);
} // get(int):String
//
// Private static methods
//
/** Loads the entity values in the specified resource. */
private static void load0(final Properties props, final String filename) {
try {
final InputStream stream = HTMLEntities.class.getResourceAsStream(filename);
props.load(stream);
stream.close();
}
catch (final IOException e) {
System.err.println("error: unable to load resource \""+filename+"\"");
}
} // load0(String)
//
// Classes
//
static class IntProperties {
private Entry[] entries = new Entry[101];
public void put(int key, String value) {
int hash = key % entries.length;
Entry entry = new Entry(key, value, entries[hash]);
entries[hash] = entry;
}
public String get(int key) {
int hash = key % entries.length;
Entry entry = entries[hash];
while (entry != null) {
if (entry.key == key) {
return entry.value;
}
entry = entry.next;
}
return null;
}
static class Entry {
public int key;
public String value;
public Entry next;
public Entry(int key, String value, Entry next) {
this.key = key;
this.value = value;
this.next = next;
}
}
}
} // class HTMLEntities