org.eclipse.jetty.util.TypeUtil Maven / Gradle / Ivy
// ========================================================================
// Copyright (c) 2004-2009 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
package org.eclipse.jetty.util;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.net.URL;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
/* ------------------------------------------------------------ */
/**
* TYPE Utilities.
* Provides various static utiltiy methods for manipulating types and their
* string representations.
*
* @since Jetty 4.1
*/
public class TypeUtil
{
private static final Logger LOG = Log.getLogger(TypeUtil.class);
public static int CR = '\015';
public static int LF = '\012';
/* ------------------------------------------------------------ */
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");
class2Name.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)
{
e.printStackTrace();
}
}
/* ------------------------------------------------------------ */
/** Array to List.
*
* Works like {@link Arrays#asList(Object...)}, but handles null arrays.
* @return a list backed by the array.
*/
public static List asList(T[] a)
{
if (a==null)
return Collections.emptyList();
return Arrays.asList(a);
}
/* ------------------------------------------------------------ */
/** 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 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 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 = class2Value.get(type);
if (m!=null)
return m.invoke(null, value);
if (type.equals(java.lang.Character.TYPE) ||
type.equals(java.lang.Character.class))
return new Character(value.charAt(0));
Constructor c = type.getConstructor(java.lang.String.class);
return c.newInstance(value);
}
catch(NoSuchMethodException e)
{
// LogSupport.ignore(log,e);
}
catch(IllegalAccessException e)
{
// LogSupport.ignore(log,e);
}
catch(InstantiationException e)
{
// LogSupport.ignore(log,e);
}
catch(InvocationTargetException e)
{
if (e.getTargetException() instanceof Error)
throw (Error)(e.getTargetException());
// LogSupport.ignore(log,e);
}
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);
}
/* ------------------------------------------------------------ */
/** 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
* @return the parsed integer
* @throws NumberFormatException if the string cannot be parsed
*/
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=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;
}
/* ------------------------------------------------------------ */
/** Parse an int from a byte array of ascii characters.
* Negative numbers are not handled.
* @param b byte array
* @param offset Offset within string
* @param length Length of integer or -1 for remainder of string
* @param base base of the integer
* @return the parsed integer
* @throws NumberFormatException if the array cannot be parsed into an integer
*/
public static int parseInt(byte[] b, int offset, int length, int base)
throws NumberFormatException
{
int value=0;
if (length<0)
length=b.length-offset;
for (int i=0;i=base || digit>=10)
{
digit=10+c-'A';
if (digit<10 || digit>=base)
digit=10+c-'a';
}
if (digit<0 || digit>=base)
throw new NumberFormatException(new String(b,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'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);
throw new IllegalArgumentException("!hex:"+Integer.toHexString(0xff&b));
}
/* ------------------------------------------------------------ */
public static void toHex(byte b,Appendable buf)
{
try
{
int bi=0xff&b;
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);
}
catch(IOException e)
{
throw new RuntimeException(e);
}
}
/* ------------------------------------------------------------ */
public static String toHexString(byte b)
{
return toHexString(new byte[]{b}, 0, 1);
}
/* ------------------------------------------------------------ */
public static String toHexString(byte[] b)
{
return toHexString(b, 0, b.length);
}
/* ------------------------------------------------------------ */
public static String toHexString(byte[] b,int offset,int length)
{
StringBuilder buf = new StringBuilder();
for (int i=offset;i'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=buf.length)
{
byte[] old_buf=buf;
buf=new byte[old_buf.length+256];
System.arraycopy(old_buf, 0, buf, 0, old_buf.length);
}
buf[i++]=(byte)ch;
}
if (ch==-1 && i==0)
return null;
// skip a trailing LF if it exists
if (ch==CR && in.available()>=1 && in.markSupported())
{
in.mark(1);
ch=in.read();
if (ch!=LF)
in.reset();
}
byte[] old_buf=buf;
buf=new byte[i];
System.arraycopy(old_buf, 0, buf, 0, i);
return buf;
}
public static URL jarFor(String className)
{
try
{
className=className.replace('.','/')+".class";
// hack to discover jstl libraries
URL url = Loader.getResource(null,className,false);
String s=url.toString();
if (s.startsWith("jar:file:"))
return new URL(s.substring(4,s.indexOf("!/")));
}
catch(Exception e)
{
LOG.ignore(e);
}
return null;
}
public static Object call(Class oClass, String method, Object obj, Object[] arg)
throws InvocationTargetException, NoSuchMethodException
{
// Lets just try all methods for now
Method[] methods = oClass.getMethods();
for (int c = 0; methods != null && c < methods.length; c++)
{
if (!methods[c].getName().equals(method))
continue;
if (methods[c].getParameterTypes().length != arg.length)
continue;
if (Modifier.isStatic(methods[c].getModifiers()) != (obj == null))
continue;
if ((obj == null) && methods[c].getDeclaringClass() != oClass)
continue;
try
{
return methods[c].invoke(obj,arg);
}
catch (IllegalAccessException e)
{
LOG.ignore(e);
}
catch (IllegalArgumentException e)
{
LOG.ignore(e);
}
}
throw new NoSuchMethodException(method);
}
}