jsputil.java

业界著名的tomcat服务器的最新6.0的源代码。

    } else {
        if (s == null || s.length() == 0)
        return "0";
        else
        return Integer.valueOf(s).toString();
    }
    }

    public static String coerceToInteger(String s, boolean isNamedAttribute) {
    if (isNamedAttribute) {
        return "(Integer) org.apache.jasper.runtime.JspRuntimeLibrary.coerce(" + s + ", Integer.class)";
    } else {
        if (s == null || s.length() == 0) {
        return "new Integer(0)";
        } else {
        // Detect format error at translation time
        return "new Integer(" + Integer.valueOf(s).toString() + ")";
        }
    }
    }

    public static String coerceToPrimitiveShort(String s,
                        boolean isNamedAttribute) {
    if (isNamedAttribute) {
        return "org.apache.jasper.runtime.JspRuntimeLibrary.coerceToShort(" + s + ")";
    } else {
        if (s == null || s.length() == 0)
        return "(short) 0";
        else
        return "((short) " + Short.valueOf(s).toString() + ")";
    }
    }
    
    public static String coerceToShort(String s, boolean isNamedAttribute) {
    if (isNamedAttribute) {
        return "(Short) org.apache.jasper.runtime.JspRuntimeLibrary.coerce(" + s + ", Short.class)";
    } else {
        if (s == null || s.length() == 0) {
        return "new Short((short) 0)";
        } else {
        // Detect format error at translation time
        return "new Short(\"" + Short.valueOf(s).toString() + "\")";
        }
    }
    }
    
    public static String coerceToPrimitiveLong(String s,
                           boolean isNamedAttribute) {
    if (isNamedAttribute) {
        return "org.apache.jasper.runtime.JspRuntimeLibrary.coerceToLong(" + s + ")";
    } else {
        if (s == null || s.length() == 0)
        return "(long) 0";
        else
        return Long.valueOf(s).toString() + "l";
    }
    }

    public static String coerceToLong(String s, boolean isNamedAttribute) {
    if (isNamedAttribute) {
        return "(Long) org.apache.jasper.runtime.JspRuntimeLibrary.coerce(" + s + ", Long.class)";
    } else {
        if (s == null || s.length() == 0) {
        return "new Long(0)";
        } else {
        // Detect format error at translation time
        return "new Long(" + Long.valueOf(s).toString() + "l)";
        }
    }
    }

    public static InputStream getInputStream(String fname, JarFile jarFile,
                         JspCompilationContext ctxt,
                         ErrorDispatcher err)
        throws JasperException, IOException {

        InputStream in = null;

    if (jarFile != null) {
        String jarEntryName = fname.substring(1, fname.length());
        ZipEntry jarEntry = jarFile.getEntry(jarEntryName);
        if (jarEntry == null) {
        err.jspError("jsp.error.file.not.found", fname);
        }
        in = jarFile.getInputStream(jarEntry);
    } else {
        in = ctxt.getResourceAsStream(fname);
    }

    if (in == null) {
        err.jspError("jsp.error.file.not.found", fname);
    }

    return in;
    }

    /**
     * Gets the fully-qualified class name of the tag handler corresponding to
     * the given tag file path.
     *
     * @param path Tag file path
     * @param err Error dispatcher
     *
     * @return Fully-qualified class name of the tag handler corresponding to 
     * the given tag file path
     */
    public static String getTagHandlerClassName(String path,
                        ErrorDispatcher err)
                throws JasperException {

        String className = null;
        int begin = 0;
        int index;
        
        index = path.lastIndexOf(".tag");
        if (index == -1) {
            err.jspError("jsp.error.tagfile.badSuffix", path);
        }

        //It's tempting to remove the ".tag" suffix here, but we can't.
        //If we remove it, the fully-qualified class name of this tag
        //could conflict with the package name of other tags.
        //For instance, the tag file
        //    /WEB-INF/tags/foo.tag
        //would have fully-qualified class name
        //    org.apache.jsp.tag.web.foo
        //which would conflict with the package name of the tag file
        //    /WEB-INF/tags/foo/bar.tag

        index = path.indexOf(WEB_INF_TAGS);
        if (index != -1) {
            className = "org.apache.jsp.tag.web.";
            begin = index + WEB_INF_TAGS.length();
        } else {
        index = path.indexOf(META_INF_TAGS);
        if (index != -1) {
        className = "org.apache.jsp.tag.meta.";
        begin = index + META_INF_TAGS.length();
        } else {
        err.jspError("jsp.error.tagfile.illegalPath", path);
        }
    }

        className += makeJavaPackage(path.substring(begin));
  
       return className;
    }

    /**
     * Converts the given path to a Java package or fully-qualified class name
     *
     * @param path Path to convert
     *
     * @return Java package corresponding to the given path
     */
    public static final String makeJavaPackage(String path) {
        String classNameComponents[] = split(path,"/");
        StringBuffer legalClassNames = new StringBuffer();
        for (int i = 0; i < classNameComponents.length; i++) {
            legalClassNames.append(makeJavaIdentifier(classNameComponents[i]));
            if (i < classNameComponents.length - 1) {
                legalClassNames.append('.');
            }
        }
        return legalClassNames.toString();
    }

    /**
     * Splits a string into it's components.
     * @param path String to split
     * @param pat Pattern to split at
     * @return the components of the path
     */
    private static final String [] split(String path, String pat) {
        Vector comps = new Vector();
        int pos = path.indexOf(pat);
        int start = 0;
        while( pos >= 0 ) {
            if(pos > start ) {
                String comp = path.substring(start,pos);
                comps.add(comp);
            }
            start = pos + pat.length();
            pos = path.indexOf(pat,start);
        }
        if( start < path.length()) {
            comps.add(path.substring(start));
        }
        String [] result = new String[comps.size()];
        for(int i=0; i < comps.size(); i++) {
            result[i] = (String)comps.elementAt(i);
        }
        return result;
    }
            
    /**
     * Converts the given identifier to a legal Java identifier
     *
     * @param identifier Identifier to convert
     *
     * @return Legal Java identifier corresponding to the given identifier
     */
    public static final String makeJavaIdentifier(String identifier) {
        StringBuffer modifiedIdentifier = 
            new StringBuffer(identifier.length());
        if (!Character.isJavaIdentifierStart(identifier.charAt(0))) {
            modifiedIdentifier.append('_');
        }
        for (int i = 0; i < identifier.length(); i++) {
            char ch = identifier.charAt(i);
            if (Character.isJavaIdentifierPart(ch) && ch != '_') {
                modifiedIdentifier.append(ch);
            } else if (ch == '.') {
                modifiedIdentifier.append('_');
            } else {
                modifiedIdentifier.append(mangleChar(ch));
            }
        }
        if (isJavaKeyword(modifiedIdentifier.toString())) {
            modifiedIdentifier.append('_');
        }
        return modifiedIdentifier.toString();
    }
    
    /**
     * Mangle the specified character to create a legal Java class name.
     */
    public static final String mangleChar(char ch) {
        char[] result = new char[5];
        result[0] = '_';
        result[1] = Character.forDigit((ch >> 12) & 0xf, 16);
        result[2] = Character.forDigit((ch >> 8) & 0xf, 16);
        result[3] = Character.forDigit((ch >> 4) & 0xf, 16);
        result[4] = Character.forDigit(ch & 0xf, 16);
        return new String(result);
    }

    /**
     * Test whether the argument is a Java keyword
     */
    public static boolean isJavaKeyword(String key) {
        int i = 0;
        int j = javaKeywords.length;
        while (i < j) {
            int k = (i+j)/2;
            int result = javaKeywords[k].compareTo(key);
            if (result == 0) {
                return true;
            }
            if (result < 0) {
                i = k+1;
            } else {
                j = k;
            }
        }
        return false;
    }

    /**
     * Converts the given Xml name to a legal Java identifier.  This is
     * slightly more efficient than makeJavaIdentifier in that we only need
     * to worry about '.', '-', and ':' in the string.  We also assume that
     * the resultant string is further concatenated with some prefix string
     * so that we don't have to worry about it being a Java key word.
     *
     * @param name Identifier to convert
     *
     * @return Legal Java identifier corresponding to the given identifier
     */
    public static final String makeXmlJavaIdentifier(String name) {
        if (name.indexOf('-') >= 0)
            name = replace(name, '-', "$1");
        if (name.indexOf('.') >= 0)
            name = replace(name, '.', "$2");
        if (name.indexOf(':') >= 0)
            name = replace(name, ':', "$3");
        return name;
    }

    static InputStreamReader getReader(String fname, String encoding,
                       JarFile jarFile,
                       JspCompilationContext ctxt,
                       ErrorDispatcher err)
        throws JasperException, IOException {

        InputStreamReader reader = null;
    InputStream in = getInputStream(fname, jarFile, ctxt, err);

    try {
            reader = new InputStreamReader(in, encoding);
    } catch (UnsupportedEncodingException ex) {
        err.jspError("jsp.error.unsupported.encoding", encoding);
    }

    return reader;
    }
    
    /**
     * Handles taking input from TLDs
     * 'java.lang.Object' -> 'java.lang.Object.class'
     * 'int' -> 'int.class'
     * 'void' -> 'Void.TYPE'
     * 'int[]' -> 'int[].class'
     * 
     * @param type
     * @return
     */
    public static String toJavaSourceTypeFromTld(String type) {
        if (type == null || "void".equals(type)) {
            return "Void.TYPE";
        }
        return type + ".class";
    }

    /**
     * Class.getName() return arrays in the form "[[[<et>", where et,
     * the element type can be one of ZBCDFIJS or L<classname>;
     * It is converted into forms that can be understood by javac.
     */
    public static String toJavaSourceType(String type) {

    if (type.charAt(0) != '[') {
        return type;
    }

    int dims = 1;
    String t = null;
    for (int i = 1; i < type.length(); i++) {
        if (type.charAt(i) == '[') {
        dims++;
        } else {
        switch (type.charAt(i)) {
        case 'Z': t = "boolean"; break;
        case 'B': t = "byte"; break;
        case 'C': t = "char"; break;
        case 'D': t = "double"; break;
        case 'F': t = "float"; break;
        case 'I': t = "int"; break;
        case 'J': t = "long"; break;
        case 'S': t = "short"; break;
        case 'L': t = type.substring(i+1, type.indexOf(';')); break;
        }
        break;
        }
    }
    StringBuffer resultType = new StringBuffer(t);
    for (; dims > 0; dims--) {
        resultType.append("[]");
    }
    return resultType.toString();
    }

    /**
     * Compute the canonical name from a Class instance.  Note that a
     * simple replacment of '$' with '.' of a binary name would not work,
     * as '$' is a legal Java Identifier character.
     * @param c A instance of java.lang.Class
     * @return  The canonical name of c.
     */
    public static String getCanonicalName(Class c) {

        String binaryName = c.getName();
        c = c.getDeclaringClass();

        if (c == null) {
            return binaryName;
        }

        StringBuffer buf = new StringBuffer(binaryName);
        do {
            buf.setCharAt(c.getName().length(), '.');
            c = c.getDeclaringClass();
        } while ( c != null);

        return buf.toString();
    }
}