Mega Code Archive
TYPE Utilities
<![CDATA[
//
// $Id: TypeUtil.java,v 1.12 2004/05/09 20:33:04 gregwilkins Exp $
// Copyright 2002-2004 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// 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.
//
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.HashMap;
/* ------------------------------------------------------------ */
/** TYPE Utilities.
* Provides various static utiltiy methods for manipulating types and their
* string representations.
*
* @since Jetty 4.1
* @version $Revision: 1.12 $
* @author Greg Wilkins (gregw)
*/
public class TypeUtil
{
/* ------------------------------------------------------------ */
private static final HashMap name2Class=new HashMap();
static
{
name2Class.put("boolean",java.lang.Boolean.TYPE);
name2Class.put("byte",java.lang.Byte.TYPE);
name2Class.put("char",java.lang.Character.TYPE);
name2Class.put("double",java.lang.Double.TYPE);
name2Class.put("float",java.lang.Float.TYPE);
name2Class.put("int",java.lang.Integer.TYPE);
name2Class.put("long",java.lang.Long.TYPE);
name2Class.put("short",java.lang.Short.TYPE);
name2Class.put("void",java.lang.Void.TYPE);
name2Class.put("java.lang.Boolean.TYPE",java.lang.Boolean.TYPE);
name2Class.put("java.lang.Byte.TYPE",java.lang.Byte.TYPE);
name2Class.put("java.lang.Character.TYPE",java.lang.Character.TYPE);
name2Class.put("java.lang.Double.TYPE",java.lang.Double.TYPE);
name2Class.put("java.lang.Float.TYPE",java.lang.Float.TYPE);
name2Class.put("java.lang.Integer.TYPE",java.lang.Integer.TYPE);
name2Class.put("java.lang.Long.TYPE",java.lang.Long.TYPE);
name2Class.put("java.lang.Short.TYPE",java.lang.Short.TYPE);
name2Class.put("java.lang.Void.TYPE",java.lang.Void.TYPE);
name2Class.put("java.lang.Boolean",java.lang.Boolean.class);
name2Class.put("java.lang.Byte",java.lang.Byte.class);
name2Class.put("java.lang.Character",java.lang.Character.class);
name2Class.put("java.lang.Double",java.lang.Double.class);
name2Class.put("java.lang.Float",java.lang.Float.class);
name2Class.put("java.lang.Integer",java.lang.Integer.class);
name2Class.put("java.lang.Long",java.lang.Long.class);
name2Class.put("java.lang.Short",java.lang.Short.class);
name2Class.put("Boolean",java.lang.Boolean.class);
name2Class.put("Byte",java.lang.Byte.class);
name2Class.put("Character",java.lang.Character.class);
name2Class.put("Double",java.lang.Double.class);
name2Class.put("Float",java.lang.Float.class);
name2Class.put("Integer",java.lang.Integer.class);
name2Class.put("Long",java.lang.Long.class);
name2Class.put("Short",java.lang.Short.class);
name2Class.put(null,java.lang.Void.TYPE);
name2Class.put("string",java.lang.String.class);
name2Class.put("String",java.lang.String.class);
name2Class.put("java.lang.String",java.lang.String.class);
}
/* ------------------------------------------------------------ */
private static final HashMap class2Name=new HashMap();
static
{
class2Name.put(java.lang.Boolean.TYPE,"boolean");
class2Name.put(java.lang.Byte.TYPE,"byte");
class2Name.put(java.lang.Character.TYPE,"char");
class2Name.put(java.lang.Double.TYPE,"double");
class2Name.put(java.lang.Float.TYPE,"float");
class2Name.put(java.lang.Integer.TYPE,"int");
class2Name.put(java.lang.Long.TYPE,"long");
class2Name.put(java.lang.Short.TYPE,"short");
class2Name.put(java.lang.Void.TYPE,"void");
class2Name.put(java.lang.Boolean.class,"java.lang.Boolean");
class2Name.put(java.lang.Byte.class,"java.lang.Byte");
class2Name.put(java.lang.Character.class,"java.lang.Character");
class2Name.put(java.lang.Double.class,"java.lang.Double");
class2Name.put(java.lang.Float.class,"java.lang.Float");
class2Name.put(java.lang.Integer.class,"java.lang.Integer");
class2Name.put(java.lang.Long.class,"java.lang.Long");
class2Name.put(java.lang.Short.class,"java.lang.Short");
class2Name.put(null,"void");
name2Class.put(java.lang.String.class,"java.lang.String");
}
/* ------------------------------------------------------------ */
private static final HashMap class2Value=new HashMap();
static
{
try
{
Class[] s ={java.lang.String.class};
class2Value.put(java.lang.Boolean.TYPE,
java.lang.Boolean.class.getMethod("valueOf",s));
class2Value.put(java.lang.Byte.TYPE,
java.lang.Byte.class.getMethod("valueOf",s));
class2Value.put(java.lang.Double.TYPE,
java.lang.Double.class.getMethod("valueOf",s));
class2Value.put(java.lang.Float.TYPE,
java.lang.Float.class.getMethod("valueOf",s));
class2Value.put(java.lang.Integer.TYPE,
java.lang.Integer.class.getMethod("valueOf",s));
class2Value.put(java.lang.Long.TYPE,
java.lang.Long.class.getMethod("valueOf",s));
class2Value.put(java.lang.Short.TYPE,
java.lang.Short.class.getMethod("valueOf",s));
class2Value.put(java.lang.Boolean.class,
java.lang.Boolean.class.getMethod("valueOf",s));
class2Value.put(java.lang.Byte.class,
java.lang.Byte.class.getMethod("valueOf",s));
class2Value.put(java.lang.Double.class,
java.lang.Double.class.getMethod("valueOf",s));
class2Value.put(java.lang.Float.class,
java.lang.Float.class.getMethod("valueOf",s));
class2Value.put(java.lang.Integer.class,
java.lang.Integer.class.getMethod("valueOf",s));
class2Value.put(java.lang.Long.class,
java.lang.Long.class.getMethod("valueOf",s));
class2Value.put(java.lang.Short.class,
java.lang.Short.class.getMethod("valueOf",s));
}
catch(Exception e)
{
}
}
/* ------------------------------------------------------------ */
private static Class[] stringArg = { java.lang.String.class };
/* ------------------------------------------------------------ */
private static int intCacheSize=
Integer.getInteger("org.mortbay.util.TypeUtil.IntegerCacheSize",600).intValue();
private static Integer[] integerCache = new Integer[intCacheSize];
private static String[] integerStrCache = new String[intCacheSize];
private static Integer minusOne = new Integer(-1);
/* ------------------------------------------------------------ */
/** Class from a canonical name for a type.
* @param name A class or type name.
* @return A class , which may be a primitive TYPE field..
*/
public static Class fromName(String name)
{
return (Class)name2Class.get(name);
}
/* ------------------------------------------------------------ */
/** Canonical name for a type.
* @param type A class , which may be a primitive TYPE field.
* @return Canonical name.
*/
public static String toName(Class type)
{
return (String)class2Name.get(type);
}
/* ------------------------------------------------------------ */
/** Convert String value to instance.
* @param type The class of the instance, which may be a primitive TYPE field.
* @param value The value as a string.
* @return The value as an Object.
*/
public static Object valueOf(Class type, String value)
{
try
{
if (type.equals(java.lang.String.class))
return value;
Method m = (Method)class2Value.get(type);
if (m!=null)
return m.invoke(null,new Object[] {value});
if (type.equals(java.lang.Character.TYPE) ||
type.equals(java.lang.Character.class))
return new Character(value.charAt(0));
Constructor c = type.getConstructor(stringArg);
return c.newInstance(new Object[] {value});
}
catch(InvocationTargetException e)
{
if (e.getTargetException() instanceof Error)
throw (Error)(e.getTargetException());
}
return null;
}
/* ------------------------------------------------------------ */
/** Convert String value to instance.
* @param type classname or type (eg int)
* @param value The value as a string.
* @return The value as an Object.
*/
public static Object valueOf(String type, String value)
{
return valueOf(fromName(type),value);
}
/* ------------------------------------------------------------ */
/** Convert int to Integer using cache.
*/
public static Integer newInteger(int i)
{
if (i>=0 && i<intCacheSize)
{
if (integerCache[i]==null)
integerCache[i]=new Integer(i);
return integerCache[i];
}
else if (i==-1)
return minusOne;
return new Integer(i);
}
/* ------------------------------------------------------------ */
/** Convert int to String using cache.
*/
public static String toString(int i)
{
if (i>=0 && i<intCacheSize)
{
if (integerStrCache[i]==null)
integerStrCache[i]=Integer.toString(i);
return integerStrCache[i];
}
else if (i==-1)
return "-1";
return Integer.toString(i);
}
/* ------------------------------------------------------------ */
/** Parse an int from a substring.
* Negative numbers are not handled.
* @param s String
* @param offset Offset within string
* @param length Length of integer or -1 for remainder of string
* @param base base of the integer
* @exception NumberFormatException
*/
public static int parseInt(String s, int offset, int length, int base)
throws NumberFormatException
{
int value=0;
if (length<0)
length=s.length()-offset;
for (int i=0;i<length;i++)
{
char c=s.charAt(offset+i);
int digit=c-'0';
if (digit<0 || digit>=base || digit>=10)
{
digit=10+c-'A';
if (digit<10 || digit>=base)
digit=10+c-'a';
}
if (digit<0 || digit>=base)
throw new NumberFormatException(s.substring(offset,offset+length));
value=value*base+digit;
}
return value;
}
/* ------------------------------------------------------------ */
public static byte[] parseBytes(String s, int base)
{
byte[] bytes=new byte[s.length()/2];
for (int i=0;i<s.length();i+=2)
bytes[i/2]=(byte)TypeUtil.parseInt(s,i,2,base);
return bytes;
}
/* ------------------------------------------------------------ */
public static String toString(byte[] bytes, int base)
{
StringBuffer buf = new StringBuffer();
for (int i=0;i<bytes.length;i++)
{
int bi=0xff&bytes[i];
int c='0'+(bi/base)%base;
if (c>'9')
c= 'a'+(c-'0'-10);
buf.append((char)c);
c='0'+bi%base;
if (c>'9')
c= 'a'+(c-'0'-10);
buf.append((char)c);
}
return buf.toString();
}
/* ------------------------------------------------------------ */
/**
* @param b An ASCII encoded character 0-9 a-f A-F
* @return The byte value of the character 0-16.
*/
public static byte convertHexDigit( byte b )
{
if ((b >= '0') && (b <= '9')) return (byte)(b - '0');
if ((b >= 'a') && (b <= 'f')) return (byte)(b - 'a' + 10);
if ((b >= 'A') && (b <= 'F')) return (byte)(b - 'A' + 10);
return 0;
}
/* ------------------------------------------------------------ */
public static String toHexString(byte[] b)
{
StringBuffer buf = new StringBuffer();
for (int i=0;i<b.length;i++)
{
int bi=0xff&b[i];
int c='0'+(bi/16)%16;
if (c>'9')
c= 'A'+(c-'0'-10);
buf.append((char)c);
c='0'+bi%16;
if (c>'9')
c= 'a'+(c-'0'-10);
buf.append((char)c);
}
return buf.toString();
}
/* ------------------------------------------------------------ */
public static String toHexString(byte[] b,int offset,int length)
{
StringBuffer buf = new StringBuffer();
for (int i=offset;i<offset+length;i++)
{
int bi=0xff&b[i];
int c='0'+(bi/16)%16;
if (c>'9')
c= 'A'+(c-'0'-10);
buf.append((char)c);
c='0'+bi%16;
if (c>'9')
c= 'a'+(c-'0'-10);
buf.append((char)c);
}
return buf.toString();
}
/* ------------------------------------------------------------ */
public static byte[] fromHexString(String s)
{
if (s.length()%2!=0)
throw new IllegalArgumentException(s);
byte[] array = new byte[s.length()/2];
for (int i=0;i<array.length;i++)
{
int b = Integer.parseInt(s.substring(i*2,i*2+2),16);
array[i]=(byte)(0xff&b);
}
return array;
}
public static void dump(Class c)
{
System.err.println("Dump: "+c);
dump(c.getClassLoader());
}
public static void dump(ClassLoader cl)
{
System.err.println("Dump Loaders:");
while(cl!=null)
{
System.err.println(" loader "+cl);
cl = cl.getParent();
}
}
}
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