| /* |
| * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package java.awt.datatransfer; |
| |
| import java.util.Enumeration; |
| import java.util.Hashtable; |
| import java.util.Iterator; |
| import java.util.Map; |
| import java.util.Set; |
| |
| |
| /** |
| * An object that encapsulates the parameter list of a MimeType |
| * as defined in RFC 2045 and 2046. |
| * |
| * @author jeff.dunn@eng.sun.com |
| */ |
| class MimeTypeParameterList implements Cloneable { |
| |
| /** |
| * Default constructor. |
| */ |
| public MimeTypeParameterList() { |
| parameters = new Hashtable<>(); |
| } |
| |
| public MimeTypeParameterList(String rawdata) |
| throws MimeTypeParseException |
| { |
| parameters = new Hashtable<>(); |
| |
| // now parse rawdata |
| parse(rawdata); |
| } |
| |
| public int hashCode() { |
| int code = Integer.MAX_VALUE/45; // "random" value for empty lists |
| String paramName = null; |
| Enumeration<String> enum_ = this.getNames(); |
| |
| while (enum_.hasMoreElements()) { |
| paramName = enum_.nextElement(); |
| code += paramName.hashCode(); |
| code += this.get(paramName).hashCode(); |
| } |
| |
| return code; |
| } // hashCode() |
| |
| /** |
| * Two parameter lists are considered equal if they have exactly |
| * the same set of parameter names and associated values. The |
| * order of the parameters is not considered. |
| */ |
| public boolean equals(Object thatObject) { |
| //System.out.println("MimeTypeParameterList.equals("+this+","+thatObject+")"); |
| if (!(thatObject instanceof MimeTypeParameterList)) { |
| return false; |
| } |
| MimeTypeParameterList that = (MimeTypeParameterList)thatObject; |
| if (this.size() != that.size()) { |
| return false; |
| } |
| String name = null; |
| String thisValue = null; |
| String thatValue = null; |
| Set<Map.Entry<String, String>> entries = parameters.entrySet(); |
| Iterator<Map.Entry<String, String>> iterator = entries.iterator(); |
| Map.Entry<String, String> entry = null; |
| while (iterator.hasNext()) { |
| entry = iterator.next(); |
| name = entry.getKey(); |
| thisValue = entry.getValue(); |
| thatValue = that.parameters.get(name); |
| if ((thisValue == null) || (thatValue == null)) { |
| // both null -> equal, only one null -> not equal |
| if (thisValue != thatValue) { |
| return false; |
| } |
| } else if (!thisValue.equals(thatValue)) { |
| return false; |
| } |
| } // while iterator |
| |
| return true; |
| } // equals() |
| |
| /** |
| * A routine for parsing the parameter list out of a String. |
| */ |
| protected void parse(String rawdata) throws MimeTypeParseException { |
| int length = rawdata.length(); |
| if(length > 0) { |
| int currentIndex = skipWhiteSpace(rawdata, 0); |
| int lastIndex = 0; |
| |
| if(currentIndex < length) { |
| char currentChar = rawdata.charAt(currentIndex); |
| while ((currentIndex < length) && (currentChar == ';')) { |
| String name; |
| String value; |
| boolean foundit; |
| |
| // eat the ';' |
| ++currentIndex; |
| |
| // now parse the parameter name |
| |
| // skip whitespace |
| currentIndex = skipWhiteSpace(rawdata, currentIndex); |
| |
| if(currentIndex < length) { |
| // find the end of the token char run |
| lastIndex = currentIndex; |
| currentChar = rawdata.charAt(currentIndex); |
| while((currentIndex < length) && isTokenChar(currentChar)) { |
| ++currentIndex; |
| currentChar = rawdata.charAt(currentIndex); |
| } |
| name = rawdata.substring(lastIndex, currentIndex).toLowerCase(); |
| |
| // now parse the '=' that separates the name from the value |
| |
| // skip whitespace |
| currentIndex = skipWhiteSpace(rawdata, currentIndex); |
| |
| if((currentIndex < length) && (rawdata.charAt(currentIndex) == '=')) { |
| // eat it and parse the parameter value |
| ++currentIndex; |
| |
| // skip whitespace |
| currentIndex = skipWhiteSpace(rawdata, currentIndex); |
| |
| if(currentIndex < length) { |
| // now find out whether or not we have a quoted value |
| currentChar = rawdata.charAt(currentIndex); |
| if(currentChar == '"') { |
| // yup it's quoted so eat it and capture the quoted string |
| ++currentIndex; |
| lastIndex = currentIndex; |
| |
| if(currentIndex < length) { |
| // find the next unescaped quote |
| foundit = false; |
| while((currentIndex < length) && !foundit) { |
| currentChar = rawdata.charAt(currentIndex); |
| if(currentChar == '\\') { |
| // found an escape sequence so pass this and the next character |
| currentIndex += 2; |
| } else if(currentChar == '"') { |
| // found it! |
| foundit = true; |
| } else { |
| ++currentIndex; |
| } |
| } |
| if(currentChar == '"') { |
| value = unquote(rawdata.substring(lastIndex, currentIndex)); |
| // eat the quote |
| ++currentIndex; |
| } else { |
| throw new MimeTypeParseException("Encountered unterminated quoted parameter value."); |
| } |
| } else { |
| throw new MimeTypeParseException("Encountered unterminated quoted parameter value."); |
| } |
| } else if(isTokenChar(currentChar)) { |
| // nope it's an ordinary token so it ends with a non-token char |
| lastIndex = currentIndex; |
| foundit = false; |
| while((currentIndex < length) && !foundit) { |
| currentChar = rawdata.charAt(currentIndex); |
| |
| if(isTokenChar(currentChar)) { |
| ++currentIndex; |
| } else { |
| foundit = true; |
| } |
| } |
| value = rawdata.substring(lastIndex, currentIndex); |
| } else { |
| // it ain't a value |
| throw new MimeTypeParseException("Unexpected character encountered at index " + currentIndex); |
| } |
| |
| // now put the data into the hashtable |
| parameters.put(name, value); |
| } else { |
| throw new MimeTypeParseException("Couldn't find a value for parameter named " + name); |
| } |
| } else { |
| throw new MimeTypeParseException("Couldn't find the '=' that separates a parameter name from its value."); |
| } |
| } else { |
| throw new MimeTypeParseException("Couldn't find parameter name"); |
| } |
| |
| // setup the next iteration |
| currentIndex = skipWhiteSpace(rawdata, currentIndex); |
| if(currentIndex < length) { |
| currentChar = rawdata.charAt(currentIndex); |
| } |
| } |
| if(currentIndex < length) { |
| throw new MimeTypeParseException("More characters encountered in input than expected."); |
| } |
| } |
| } |
| } |
| |
| /** |
| * return the number of name-value pairs in this list. |
| */ |
| public int size() { |
| return parameters.size(); |
| } |
| |
| /** |
| * Determine whether or not this list is empty. |
| */ |
| public boolean isEmpty() { |
| return parameters.isEmpty(); |
| } |
| |
| /** |
| * Retrieve the value associated with the given name, or null if there |
| * is no current association. |
| */ |
| public String get(String name) { |
| return parameters.get(name.trim().toLowerCase()); |
| } |
| |
| /** |
| * Set the value to be associated with the given name, replacing |
| * any previous association. |
| */ |
| public void set(String name, String value) { |
| parameters.put(name.trim().toLowerCase(), value); |
| } |
| |
| /** |
| * Remove any value associated with the given name. |
| */ |
| public void remove(String name) { |
| parameters.remove(name.trim().toLowerCase()); |
| } |
| |
| /** |
| * Retrieve an enumeration of all the names in this list. |
| */ |
| public Enumeration<String> getNames() { |
| return parameters.keys(); |
| } |
| |
| public String toString() { |
| // Heuristic: 8 characters per field |
| StringBuilder buffer = new StringBuilder(parameters.size() * 16); |
| |
| Enumeration<String> keys = parameters.keys(); |
| while(keys.hasMoreElements()) |
| { |
| buffer.append("; "); |
| |
| String key = keys.nextElement(); |
| buffer.append(key); |
| buffer.append('='); |
| buffer.append(quote(parameters.get(key))); |
| } |
| |
| return buffer.toString(); |
| } |
| |
| /** |
| * @return a clone of this object |
| */ |
| @SuppressWarnings("unchecked") // Cast from clone |
| public Object clone() { |
| MimeTypeParameterList newObj = null; |
| try { |
| newObj = (MimeTypeParameterList)super.clone(); |
| } catch (CloneNotSupportedException cannotHappen) { |
| } |
| newObj.parameters = (Hashtable<String, String>)parameters.clone(); |
| return newObj; |
| } |
| |
| private Hashtable<String, String> parameters; |
| |
| // below here be scary parsing related things |
| |
| /** |
| * Determine whether or not a given character belongs to a legal token. |
| */ |
| private static boolean isTokenChar(char c) { |
| return ((c > 040) && (c < 0177)) && (TSPECIALS.indexOf(c) < 0); |
| } |
| |
| /** |
| * return the index of the first non white space character in |
| * rawdata at or after index i. |
| */ |
| private static int skipWhiteSpace(String rawdata, int i) { |
| int length = rawdata.length(); |
| if (i < length) { |
| char c = rawdata.charAt(i); |
| while ((i < length) && Character.isWhitespace(c)) { |
| ++i; |
| c = rawdata.charAt(i); |
| } |
| } |
| |
| return i; |
| } |
| |
| /** |
| * A routine that knows how and when to quote and escape the given value. |
| */ |
| private static String quote(String value) { |
| boolean needsQuotes = false; |
| |
| // check to see if we actually have to quote this thing |
| int length = value.length(); |
| for(int i = 0; (i < length) && !needsQuotes; ++i) { |
| needsQuotes = !isTokenChar(value.charAt(i)); |
| } |
| |
| if(needsQuotes) { |
| StringBuilder buffer = new StringBuilder((int)(length * 1.5)); |
| |
| // add the initial quote |
| buffer.append('"'); |
| |
| // add the properly escaped text |
| for(int i = 0; i < length; ++i) { |
| char c = value.charAt(i); |
| if((c == '\\') || (c == '"')) { |
| buffer.append('\\'); |
| } |
| buffer.append(c); |
| } |
| |
| // add the closing quote |
| buffer.append('"'); |
| |
| return buffer.toString(); |
| } |
| else |
| { |
| return value; |
| } |
| } |
| |
| /** |
| * A routine that knows how to strip the quotes and escape sequences from the given value. |
| */ |
| private static String unquote(String value) { |
| int valueLength = value.length(); |
| StringBuilder buffer = new StringBuilder(valueLength); |
| |
| boolean escaped = false; |
| for(int i = 0; i < valueLength; ++i) { |
| char currentChar = value.charAt(i); |
| if(!escaped && (currentChar != '\\')) { |
| buffer.append(currentChar); |
| } else if(escaped) { |
| buffer.append(currentChar); |
| escaped = false; |
| } else { |
| escaped = true; |
| } |
| } |
| |
| return buffer.toString(); |
| } |
| |
| /** |
| * A string that holds all the special chars. |
| */ |
| private static final String TSPECIALS = "()<>@,;:\\\"/[]?="; |
| |
| } |