org.apache.axis2.util.JavaUtils Maven / Gradle / Ivy
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* 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.axis2.util;
import java.text.Collator;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Locale;
/**
* JavaUtils
*/
public class JavaUtils {
/**
* These are java keywords as specified at the following URL (sorted alphabetically).
* http://java.sun.com/docs/books/jls/second_edition/html/lexical.doc.html#229308
* Note that false, true, and null are not strictly keywords; they are literal values,
* but for the purposes of this array, they can be treated as literals.
* ****** PLEASE KEEP THIS LIST SORTED IN ASCENDING ORDER ******
*/
static final String keywords[] =
{
"abstract", "assert", "boolean", "break", "byte", "case",
"catch", "char", "class", "const", "continue",
"default", "do", "double", "else", "extends",
"false", "final", "finally", "float", "for",
"goto", "if", "implements", "import", "instanceof",
"int", "interface", "long", "native", "new",
"null", "package", "private", "protected", "public",
"return", "short", "static", "strictfp", "super",
"switch", "synchronized", "this", "throw", "throws",
"transient", "true", "try", "void", "volatile",
"while"
};
/**
* Collator for comparing the strings
*/
static final Collator englishCollator = Collator.getInstance(Locale.ENGLISH);
/**
* Use this character as suffix
*/
static final char keywordPrefix = '_';
/**
* Is this an XML punctuation character?
*/
private static boolean isPunctuation(char c) {
return '-' == c
|| '.' == c
|| ':' == c
|| '\u00B7' == c
|| '\u0387' == c
|| '-' == c
|| '\u06DD' == c
|| '\u06DE' == c;
} // isPunctuation
/**
* Checks if the input string is a valid java keyword.
*
* @return Returns boolean.
*/
public static boolean isJavaKeyword(String keyword) {
// None of the java keywords have uppercase characters
if (hasUpperCase(keyword)) {
return false;
}
return (Arrays.binarySearch(keywords, keyword, englishCollator) >= 0);
}
/**
* Check if the word has any uppercase letters
*
* @param word
* @return
*/
public static boolean hasUpperCase(String word) {
if (word == null) {
return false;
}
int len = word.length();
for (int i = 0; i < len; i++) {
if (Character.isUpperCase(word.charAt(i))) {
return true;
}
}
return false;
}
/**
* Turns a java keyword string into a non-Java keyword string. (Right now
* this simply means appending an underscore.)
*/
public static String makeNonJavaKeyword(String keyword) {
return keywordPrefix + keyword;
}
public static String xmlNameToJava(String name) {
// protect ourselves from garbage
if (name == null || name.length() == 0) {
return name;
}
char[] nameArray = name.toCharArray();
int nameLen = name.length();
StringBuffer result = new StringBuffer(nameLen);
boolean wordStart = false;
// The mapping indicates to convert first character.
int i = 0;
while (i < nameLen
&& (isPunctuation(nameArray[i])
|| !Character.isJavaIdentifierStart(nameArray[i]))) {
i++;
}
if (i < nameLen) {
// Decapitalization code used to be here, but we use the
// Introspector function now after we filter out all bad chars.
result.append(nameArray[i]);
//wordStart = !Character.isLetter(nameArray[i]);
wordStart = !Character.isLetter(nameArray[i]) && nameArray[i] != "_".charAt(0);
} else {
// The identifier cannot be mapped strictly according to
// JSR 101
if (Character.isJavaIdentifierPart(nameArray[0])) {
result.append("_").append(nameArray[0]);
} else {
// The XML identifier does not contain any characters
// we can map to Java. Using the length of the string
// will make it somewhat unique.
result.append("_").append(nameArray.length);
}
}
// The mapping indicates to skip over
// all characters that are not letters or
// digits. The first letter/digit
// following a skipped character is
// upper-cased.
for (++i; i < nameLen; ++i) {
char c = nameArray[i];
// if this is a bad char, skip it and remember to capitalize next
// good character we encounter
if (isPunctuation(c) || !Character.isJavaIdentifierPart(c)) {
wordStart = true;
continue;
}
if (wordStart && Character.isLowerCase(c)) {
result.append(Character.toUpperCase(c));
} else {
result.append(c);
}
// If c is not a character, but is a legal Java
// identifier character, capitalize the next character.
// For example: "22hi" becomes "22Hi"
//wordStart = !Character.isLetter(c);
wordStart = !Character.isLetter(c) && c != "_".charAt(0);
}
// covert back to a String
String newName = result.toString();
// check for Java keywords
if (isJavaKeyword(newName)) {
newName = makeNonJavaKeyword(newName);
}
return newName;
} // xmlNameToJava
/**
* Capitalizes the first character of the name.
*
* @param name
* @return Returns String.
*/
public static String capitalizeFirstChar(String name) {
if ((name == null) || name.length() == 0) {
return name;
}
char start = name.charAt(0);
if (Character.isLowerCase(start)) {
start = Character.toUpperCase(start);
return start + name.substring(1);
}
return name;
} // capitalizeFirstChar
/**
* converts an xml name to a java identifier
*
* @param name
* @return java identifier
*/
public static String xmlNameToJavaIdentifier(String name) {
String javaName = xmlNameToJava(name);
// convert the first letter to lowercase
if ((javaName != null) && (javaName.length() > 0)) {
javaName = javaName.substring(0, 1).toLowerCase() + javaName.substring(1);
}
return javaName;
}
/**
* Tests the String 'value':
* return 'false' if its 'false', '0', or 'no' - else 'true'
*
* Follow in 'C' tradition of boolean values:
* false is specific (0), everything else is true;
*/
public static boolean isTrue(String value) {
return !isFalseExplicitly(value);
}
/**
* Tests the String 'value':
* return 'true' if its 'true', '1', or 'yes' - else 'false'
*/
public static boolean isTrueExplicitly(String value) {
return value != null &&
(value.equalsIgnoreCase("true") ||
value.equals("1") ||
value.equalsIgnoreCase("yes"));
}
/**
* Tests the Object 'value':
* if its null, return default.
* if its a Boolean, return booleanValue()
* if its an Integer, return 'false' if its '0' else 'true'
* if its a String, return isTrueExplicitly((String)value).
* All other types return 'true'
*/
public static boolean isTrueExplicitly(Object value, boolean defaultVal) {
if (value == null) {
return defaultVal;
}
if (value instanceof Boolean) {
return ((Boolean) value).booleanValue();
}
if (value instanceof Integer) {
return ((Integer) value).intValue() != 0;
}
if (value instanceof String) {
return isTrueExplicitly((String) value);
}
return defaultVal;
}
public static boolean isTrueExplicitly(Object value) {
return isTrueExplicitly(value, false);
}
/**
* Tests the Object 'value':
* if its null, return default.
* if its a Boolean, return booleanValue()
* if its an Integer, return 'false' if its '0' else 'true'
* if its a String, return 'false' if its 'false', 'no', or '0' - else 'true'
* All other types return 'true'
*/
public static boolean isTrue(Object value, boolean defaultVal) {
return !isFalseExplicitly(value, !defaultVal);
}
public static boolean isTrue(Object value) {
return isTrue(value, false);
}
/**
* Tests the String 'value':
* return 'true' if its 'false', '0', or 'no' - else 'false'
*
* Follow in 'C' tradition of boolean values:
* false is specific (0), everything else is true;
*/
public static boolean isFalse(String value) {
return isFalseExplicitly(value);
}
/**
* Tests the String 'value':
* return 'true' if its null, 'false', '0', or 'no' - else 'false'
*/
public static boolean isFalseExplicitly(String value) {
return value == null ||
value.equalsIgnoreCase("false") ||
value.equals("0") ||
value.equalsIgnoreCase("no");
}
/**
* Tests the Object 'value':
* if its null, return default.
* if its a Boolean, return !booleanValue()
* if its an Integer, return 'true' if its '0' else 'false'
* if its a String, return isFalseExplicitly((String)value).
* All other types return 'false'
*/
public static boolean isFalseExplicitly(Object value, boolean defaultVal) {
if (value == null) {
return defaultVal;
}
if (value instanceof Boolean) {
return !((Boolean) value).booleanValue();
}
if (value instanceof Integer) {
return ((Integer) value).intValue() == 0;
}
if (value instanceof String) {
return isFalseExplicitly((String) value);
}
return false;
}
public static boolean isFalseExplicitly(Object value) {
return isFalseExplicitly(value, true);
}
/**
* Tests the Object 'value':
* if its null, return default.
* if its a Boolean, return booleanValue()
* if its an Integer, return 'false' if its '0' else 'true'
* if its a String, return 'false' if its 'false', 'no', or '0' - else 'true'
* All other types return 'true'
*/
public static boolean isFalse(Object value, boolean defaultVal) {
return isFalseExplicitly(value, defaultVal);
}
public static boolean isFalse(Object value) {
return isFalse(value, true);
}
public static boolean isJavaId(String id) {
if (id == null || id.length() == 0 || isJavaKeyword(id)) {
return false;
}
if (!Character.isJavaIdentifierStart(id.charAt(0))) {
return false;
}
for (int i = 1; i < id.length(); i++) {
if (!Character.isJavaIdentifierPart(id.charAt(i))) {
return false;
}
}
return true;
}
/**
* An empty immutable String array.
*/
public static final String[] EMPTY_STRING_ARRAY = new String[0];
/**
* Splits the provided text into an array, separator specified.
* This is an alternative to using StringTokenizer.
*
* The separator is not included in the returned String array.
* Adjacent separators are treated as one separator.
*
* A null input String returns null.
*
*
* StringUtils.split(null, *) = null
* StringUtils.split("", *) = []
* StringUtils.split("a.b.c", '.') = ["a", "b", "c"]
* StringUtils.split("a..b.c", '.') = ["a", "b", "c"]
* StringUtils.split("a:b:c", '.') = ["a:b:c"]
* StringUtils.split("a\tb\nc", null) = ["a", "b", "c"]
* StringUtils.split("a b c", ' ') = ["a", "b", "c"]
*
*
* @param str the String to parse, may be null
* @param separatorChar the character used as the delimiter,
* null splits on whitespace
* @return an array of parsed Strings, null if null String input
*/
public static String[] split(String str, char separatorChar) {
if (str == null) {
return null;
}
int len = str.length();
if (len == 0) {
return EMPTY_STRING_ARRAY;
}
List list = new ArrayList();
int i = 0, start = 0;
boolean match = false;
while (i < len) {
if (str.charAt(i) == separatorChar) {
if (match) {
list.add(str.substring(start, i));
match = false;
}
start = ++i;
continue;
}
match = true;
i++;
}
if (match) {
list.add(str.substring(start, i));
}
return (String[]) list.toArray(new String[list.size()]);
}
public static Class getWrapperClass(Class primitive) {
if (primitive == int.class) {
return java.lang.Integer.class;
} else if (primitive == short.class) {
return java.lang.Short.class;
} else if (primitive == boolean.class) {
return java.lang.Boolean.class;
} else if (primitive == byte.class) {
return java.lang.Byte.class;
} else if (primitive == long.class) {
return java.lang.Long.class;
} else if (primitive == double.class) {
return java.lang.Double.class;
} else if (primitive == float.class) {
return java.lang.Float.class;
} else if (primitive == char.class) {
return java.lang.Character.class;
}
return null;
}
public static Class getWrapperClass(String primitive) {
if (primitive.equals("int")) {
return java.lang.Integer.class;
} else if (primitive.equals("short")) {
return java.lang.Short.class;
} else if (primitive.equals("boolean")) {
return java.lang.Boolean.class;
} else if (primitive.equals("byte")) {
return java.lang.Byte.class;
} else if (primitive.equals("long")) {
return java.lang.Long.class;
} else if (primitive.equals("double")) {
return java.lang.Double.class;
} else if (primitive.equals("float")) {
return java.lang.Float.class;
} else if (primitive.equals("char")) {
return java.lang.Character.class;
}
return null;
}
/**
* Scans the parameter string for the parameter search ignoring case when
* comparing characters.
*
* @param string
* @param search If test is empty -1 is always returned.
* @return -1 if the string was not found or the index of the first matching
* character
*/
public static int indexOfIgnoreCase(final String string,
final String search) {
int index = -1;
final int stringLength = string.length();
final int testLength = search.length();
if (stringLength > 1 || testLength > 1) {
final char firstCharOfTest = Character.toLowerCase(search.charAt(0));
final int lastStringCharacterToCheck = stringLength - testLength + 1;
for (int i = 0; i < lastStringCharacterToCheck; i++) {
if (firstCharOfTest == Character.toLowerCase(string.charAt(i))) {
index = i;
for (int j = 1; j < testLength; j++) {
final char c = string.charAt(i + j);
final char otherChar = search.charAt(j);
if (Character.toLowerCase(c) != Character.toLowerCase(otherChar)) {
index = -1;
break;
}
}
if (-1 != index) {
break;
}
}
}
}
return index;
}
/**
* replace: Like String.replace except that the old new items are strings.
*
* @param name string
* @param oldT old text to replace
* @param newT new text to use
* @return replacement string
*/
public static final String replace(String name,
String oldT, String newT) {
if (name == null) return "";
// Create a string buffer that is twice initial length.
// This is a good starting point.
StringBuffer sb = new StringBuffer(name.length() * 2);
int len = oldT.length();
try {
int start = 0;
int i = name.indexOf(oldT, start);
while (i >= 0) {
sb.append(name.substring(start, i));
sb.append(newT);
start = i + len;
i = name.indexOf(oldT, start);
}
if (start < name.length())
sb.append(name.substring(start));
} catch (NullPointerException e) {
// No FFDC code needed
}
return new String(sb);
}
/**
* Get a string containing the stack of the current location.
* Note This utility is useful in debug scenarios to dump out
* the call stack.
*
* @return String
*/
public static String callStackToString() {
return stackToString(new RuntimeException());
}
/**
* Get a string containing the stack of the specified exception
*
* @param e
* @return
*/
public static String stackToString(Throwable e) {
java.io.StringWriter sw = new java.io.StringWriter();
java.io.BufferedWriter bw = new java.io.BufferedWriter(sw);
java.io.PrintWriter pw = new java.io.PrintWriter(bw);
e.printStackTrace(pw);
pw.close();
String text = sw.getBuffer().toString();
// Jump past the throwable
text = text.substring(text.indexOf("at"));
text = replace(text, "at ", "DEBUG_FRAME = ");
return text;
}
/**
* Mimics the default Object.toString() produces a string of the form:
*
* obj.getClass().getName() + "@" + object's hashCode.
*
* This method can be used to print the debug message when you want
* just the short name or if using the toString will cause full expansion
* of underlying data structures.
*
* The returned value can also be used as an identity key.
*
* @return obj.getClass().getName() + "@" + Integer.toHexString(System.identityHashCode(obj));
*/
public static String getObjectIdentity(Object obj) {
if (obj == null) {
return "null";
}
return obj.getClass().getName() + "@" + Integer.toHexString(System.identityHashCode(obj));
}
}
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