jersey.repackaged.com.google.common.escape.CharEscaperBuilder Maven / Gradle / Ivy
/*
* Copyright (C) 2006 The Guava Authors
*
* 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 jersey.repackaged.com.google.common.escape;
import static jersey.repackaged.com.google.common.base.Preconditions.checkNotNull;
import jersey.repackaged.com.google.common.annotations.Beta;
import jersey.repackaged.com.google.common.annotations.GwtCompatible;
import java.util.HashMap;
import java.util.Map;
/**
* Simple helper class to build a "sparse" array of objects based on the indexes that were added to
* it. The array will be from 0 to the maximum index given. All non-set indexes will contain null
* (so it's not really a sparse array, just a pseudo sparse array). The builder can also return a
* CharEscaper based on the generated array.
*
* @author Sven Mawson
* @since 15.0
*/
@Beta
@GwtCompatible
public final class CharEscaperBuilder {
/**
* Simple decorator that turns an array of replacement char[]s into a CharEscaper, this results in
* a very fast escape method.
*/
private static class CharArrayDecorator extends CharEscaper {
private final char[][] replacements;
private final int replaceLength;
CharArrayDecorator(char[][] replacements) {
this.replacements = replacements;
this.replaceLength = replacements.length;
}
/*
* Overriding escape method to be slightly faster for this decorator. We test the replacements
* array directly, saving a method call.
*/
@Override public String escape(String s) {
int slen = s.length();
for (int index = 0; index < slen; index++) {
char c = s.charAt(index);
if (c < replacements.length && replacements[c] != null) {
return escapeSlow(s, index);
}
}
return s;
}
@Override protected char[] escape(char c) {
return c < replaceLength ? replacements[c] : null;
}
}
// Replacement mappings.
private final Map map;
// The highest index we've seen so far.
private int max = -1;
/**
* Construct a new sparse array builder.
*/
public CharEscaperBuilder() {
this.map = new HashMap();
}
/**
* Add a new mapping from an index to an object to the escaping.
*/
public CharEscaperBuilder addEscape(char c, String r) {
map.put(c, checkNotNull(r));
if (c > max) {
max = c;
}
return this;
}
/**
* Add multiple mappings at once for a particular index.
*/
public CharEscaperBuilder addEscapes(char[] cs, String r) {
checkNotNull(r);
for (char c : cs) {
addEscape(c, r);
}
return this;
}
/**
* Convert this builder into an array of char[]s where the maximum index is the value of the
* highest character that has been seen. The array will be sparse in the sense that any unseen
* index will default to null.
*
* @return a "sparse" array that holds the replacement mappings.
*/
public char[][] toArray() {
char[][] result = new char[max + 1][];
for (Map.Entry entry : map.entrySet()) {
result[entry.getKey()] = entry.getValue().toCharArray();
}
return result;
}
/**
* Convert this builder into a char escaper which is just a decorator around the underlying array
* of replacement char[]s.
*
* @return an escaper that escapes based on the underlying array.
*/
public Escaper toEscaper() {
return new CharArrayDecorator(toArray());
}
}