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A library for automatic detection of layout bugs in web pages
/*
* Copyright 2009-2011 Michael Tamm
*
* 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 com.googlecode.fightinglayoutbugs;
import java.util.*;
/**
* @author Michael Tamm
*/
public class StringHelper {
/**
* Null-safe string comparison.
*/
public static boolean equals(String s1, String s2) {
return (s1 == null ? s2 == null : s1.equals(s2));
}
/**
* Removes leading and trailing whitespaces from s and replaces
* all sequences of whitespaces inside s with a single space character.
*/
public static String normalizeSpace(String s) {
final String result;
if (s == null) {
result = null;
} else {
final int n = s.length();
final StringBuilder sb = new StringBuilder(n);
boolean lastCharacterWasWhitespace = true;
for (int i = 0; i < n; ++i) {
final char c = s.charAt(i);
if (Character.isWhitespace(c)) {
lastCharacterWasWhitespace = true;
} else {
if (lastCharacterWasWhitespace && sb.length() > 0) {
sb.append(' ');
}
sb.append(c);
lastCharacterWasWhitespace = false;
}
}
result = sb.toString();
}
return result;
}
/**
* Returns "1 " + noun, if amount == 1,
* or amount + " " + {@link #englishPluralOf englishPluralOf}(noun) otherwise.
*/
public static String amountString(long amount, String noun) {
return (amount == 1 ? "1 " + noun : amount + " " + englishPluralOf(noun));
}
public static String englishPluralOf(String noun) {
final String result;
if (noun.endsWith("is")) {
// E.g. "thesis" => "theses"
result = noun.substring(0, noun.length() - 2) + "es";
} else if (noun.endsWith("fe")) {
// E.g. "knife" => "knifes"
result = noun.substring(0, noun.length() - 2) + "ves";
} else if (noun.endsWith("ay") || noun.endsWith("ey") || noun.endsWith("iy") || noun.endsWith("oy") || noun.endsWith("uy")) {
// E.g. "key" => "keys"
result = noun + "s";
} else if (noun.endsWith("ch") || noun.endsWith("s") || noun.endsWith("sh") || noun.endsWith("x") || noun.endsWith("z")) {
// E.g. "box" => "boxes"
result = noun + "es";
} else if (noun.endsWith("y")) {
// E.g. "entry" => "entries"
result = noun.substring(0, noun.length() - 1) + "ies";
} else if (noun.endsWith("f")) {
// E.g. "self" => "selves"
result = noun.substring(0, noun.length() - 1) + "ves";
} else {
result = noun + "s";
}
return result;
}
/**
* Converts the given object to a string useful for log messages
* with special handling of {@link String}s, arrays, {@link Collection}s,
* {@link Map}s, {@link Class}es and {@link Calendar}s.
*/
public static String asString(Object o) {
final StringBuilder sb = new StringBuilder();
objectAsString(o, sb);
return sb.toString();
}
private static void objectAsString(Object o, StringBuilder sb) {
if (o == null) {
sb.append("null");
} else if (o instanceof String) {
stringAsString((String) o, sb);
} else if (o.getClass().isArray()) {
arrayAsString(o, sb);
} else if (o instanceof Collection) {
collectionAsString((Collection) o, sb);
} else if (o instanceof Map) {
mapAsString((Map) o, sb);
} else if (o instanceof Class){
sb.append(((Class) o).getName());
} else if (o instanceof Calendar) {
sb.append(((Calendar) o).getTime());
} else {
sb.append(o);
}
}
private static void stringAsString(String s, StringBuilder sb) {
if (s == null) {
sb.append("null");
} else {
sb.append('"').append(s.replace("\\", "\\\\").replace("\f", "\\f").replace("\t", "\\t").replace("\r", "\\r").replace("\n", "\\n").replace("\0", "\\0")).append('"');
}
}
private static void arrayAsString(Object array, StringBuilder sb) {
if (array instanceof boolean[]) {
sb.append(Arrays.toString((boolean[]) array));
} else if (array instanceof byte[]) {
sb.append(Arrays.toString((byte[]) array));
} else if (array instanceof char[]) {
sb.append(Arrays.toString((char[]) array));
} else if (array instanceof short[]) {
sb.append(Arrays.toString((short[]) array));
} else if (array instanceof int[]) {
sb.append(Arrays.toString((int[]) array));
} else if (array instanceof long[]) {
sb.append(Arrays.toString((long[]) array));
} else if (array instanceof float[]) {
sb.append(Arrays.toString((float[]) array));
} else if (array instanceof double[]) {
sb.append(Arrays.toString((double []) array));
} else {
objectArrayAsString((Object[]) array, sb);
}
}
private static void objectArrayAsString(Object[] array, StringBuilder sb) {
sb.append('[');
if (array.length > 0) {
sb.append(asString(array[0]));
for (int i = 1; i < array.length; ++i) {
sb.append(", ");
objectAsString(array[i], sb);
}
}
sb.append(']');
}
private static void collectionAsString(Collection collection, StringBuilder sb) {
sb.append('{');
final Iterator i = collection.iterator();
if (i.hasNext()) {
objectAsString(i.next(), sb);
while (i.hasNext()) {
sb.append(", ");
objectAsString(i.next(), sb);
}
}
sb.append('}');
}
private static void mapAsString(Map map, StringBuilder sb) {
sb.append('{');
final Iterator i = map.entrySet().iterator();
if (i.hasNext()) {
Map.Entry mapEntry = (Map.Entry) i.next();
objectAsString(mapEntry.getKey(), sb);
sb.append(" => ");
objectAsString(mapEntry.getValue(), sb);
while (i.hasNext()) {
sb.append(", ");
mapEntry = (Map.Entry) i.next();
objectAsString(mapEntry.getKey(), sb);
sb.append(" => ");
objectAsString(mapEntry.getValue(), sb);
}
}
sb.append('}');
}
protected StringHelper() {}
}
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