typeutil.java

jetty SERVER連接資料庫用的軟體

// ========================================================================
// Copyright 2004-2005 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.
// ========================================================================

package org.mortbay.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.net.URL;
import java.util.HashMap;

import org.mortbay.log.Log;


/* ------------------------------------------------------------ */
/** TYPE Utilities.
 * Provides various static utiltiy methods for manipulating types and their
 * string representations.
 *
 * @since Jetty 4.1
 * @author Greg Wilkins (gregw)
 */
public class TypeUtil
{
    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();
        }
    }

    /* ------------------------------------------------------------ */
    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);
    private static int longCacheSize=
        Integer.getInteger("org.mortbay.util.TypeUtil.LongCacheSize",64).intValue();
    private static Long[] longCache = new Long[longCacheSize];
    private static Long minusOneL = new Long(-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(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);
    }
    
    /* ------------------------------------------------------------ */
    /** 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 Integer using cache. 
     */
    public static Long newLong(long i)
    {
        if (i>=0 && i<longCacheSize)
        {
            if (longCache[(int)i]==null)
                longCache[(int)i]=new Long(i);
            return longCache[(int)i];
        }
        else if (i==-1)
            return minusOneL;
        return new Long(i);
    }

    
    /* ------------------------------------------------------------ */