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Apache Commons Text is a library focused on algorithms working on strings.
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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 org.apache.commons.text.matcher;
/**
* Provides access to matchers defined in this package.
*
* @since 1.3
*/
public final class StringMatcherFactory {
/**
* Defines the singleton for this class.
*/
public static final StringMatcherFactory INSTANCE = new StringMatcherFactory();
/**
* Matches the same characters as StringTokenizer, namely space, tab, newline, form feed.
*/
private static final AbstractStringMatcher.CharSetMatcher SPLIT_MATCHER = new AbstractStringMatcher.CharSetMatcher(
" \t\n\r\f".toCharArray());
/**
* Matches the comma character.
*/
private static final AbstractStringMatcher.CharMatcher COMMA_MATCHER = new AbstractStringMatcher.CharMatcher(',');
/**
* Matches the tab character.
*/
private static final AbstractStringMatcher.CharMatcher TAB_MATCHER = new AbstractStringMatcher.CharMatcher('\t');
/**
* Matches the space character.
*/
private static final AbstractStringMatcher.CharMatcher SPACE_MATCHER = new AbstractStringMatcher.CharMatcher(' ');
/**
* Matches the String trim() whitespace characters.
*/
private static final AbstractStringMatcher.TrimMatcher TRIM_MATCHER = new AbstractStringMatcher.TrimMatcher();
/**
* Matches the double quote character.
*/
private static final AbstractStringMatcher.CharMatcher SINGLE_QUOTE_MATCHER = new AbstractStringMatcher.CharMatcher(
'\'');
/**
* Matches the double quote character.
*/
private static final AbstractStringMatcher.CharMatcher DOUBLE_QUOTE_MATCHER = new AbstractStringMatcher.CharMatcher(
'"');
/**
* Matches the single or double quote character.
*/
private static final AbstractStringMatcher.CharSetMatcher QUOTE_MATCHER = new AbstractStringMatcher.CharSetMatcher(
"'\"".toCharArray());
/**
* Matches no characters.
*/
private static final AbstractStringMatcher.NoMatcher NONE_MATCHER = new AbstractStringMatcher.NoMatcher();
/**
* No need to build instances for now.
*/
private StringMatcherFactory() {
// empty
}
/**
* Constructor that creates a matcher from a character.
*
* @param ch
* the character to match, must not be null
* @return a new Matcher for the given char
*/
public StringMatcher charMatcher(final char ch) {
return new AbstractStringMatcher.CharMatcher(ch);
}
/**
* Constructor that creates a matcher from a set of characters.
*
* @param chars
* the characters to match, null or empty matches nothing
* @return a new matcher for the given char[]
*/
public StringMatcher charSetMatcher(final char... chars) {
if (chars == null || chars.length == 0) {
return NONE_MATCHER;
}
if (chars.length == 1) {
return new AbstractStringMatcher.CharMatcher(chars[0]);
}
return new AbstractStringMatcher.CharSetMatcher(chars);
}
/**
* Creates a matcher from a string representing a set of characters.
*
* @param chars
* the characters to match, null or empty matches nothing
* @return a new Matcher for the given characters
*/
public StringMatcher charSetMatcher(final String chars) {
if (chars == null || chars.length() == 0) {
return NONE_MATCHER;
}
if (chars.length() == 1) {
return new AbstractStringMatcher.CharMatcher(chars.charAt(0));
}
return new AbstractStringMatcher.CharSetMatcher(chars.toCharArray());
}
/**
* Returns a matcher which matches the comma character.
*
* @return a matcher for a comma
*/
public StringMatcher commaMatcher() {
return COMMA_MATCHER;
}
/**
* Returns a matcher which matches the double quote character.
*
* @return a matcher for a double quote
*/
public StringMatcher doubleQuoteMatcher() {
return DOUBLE_QUOTE_MATCHER;
}
/**
* Matches no characters.
*
* @return a matcher that matches nothing
*/
public StringMatcher noneMatcher() {
return NONE_MATCHER;
}
/**
* Returns a matcher which matches the single or double quote character.
*
* @return a matcher for a single or double quote
*/
public StringMatcher quoteMatcher() {
return QUOTE_MATCHER;
}
/**
* Returns a matcher which matches the single quote character.
*
* @return a matcher for a single quote
*/
public StringMatcher singleQuoteMatcher() {
return SINGLE_QUOTE_MATCHER;
}
/**
* Returns a matcher which matches the space character.
*
* @return a matcher for a space
*/
public StringMatcher spaceMatcher() {
return SPACE_MATCHER;
}
/**
* Matches the same characters as StringTokenizer, namely space, tab, newline and form feed.
*
* @return the split matcher
*/
public StringMatcher splitMatcher() {
return SPLIT_MATCHER;
}
/**
* Creates a matcher from a string.
*
* @param str
* the string to match, null or empty matches nothing
* @return a new Matcher for the given String
*/
public StringMatcher stringMatcher(final String str) {
if (str == null || str.length() == 0) {
return NONE_MATCHER;
}
return new AbstractStringMatcher.StringMatcher(str);
}
/**
* Returns a matcher which matches the tab character.
*
* @return a matcher for a tab
*/
public StringMatcher tabMatcher() {
return TAB_MATCHER;
}
/**
* Matches the String trim() whitespace characters.
*
* @return the trim matcher
*/
public StringMatcher trimMatcher() {
return TRIM_MATCHER;
}
}