| /** |
| * |
| * Copyright 2003-2004 The Apache Software Foundation |
| * |
| * 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 javax.activation; |
| |
| import java.util.Collections; |
| import java.util.Enumeration; |
| import java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.Map; |
| |
| |
| /** |
| * @version $Rev$ $Date$ |
| */ |
| public class MimeTypeParameterList { |
| |
| private final Map params = new HashMap(); |
| |
| public MimeTypeParameterList() { |
| } |
| |
| public MimeTypeParameterList(String parameterList) throws MimeTypeParseException { |
| parse(parameterList); |
| } |
| |
| protected void parse(String parameterList) throws MimeTypeParseException { |
| if (parameterList == null) { |
| throw new MimeTypeParseException("parameterList is null"); |
| } |
| |
| RFC2045Parser parser = new RFC2045Parser(parameterList); |
| while (parser.hasMoreParams()) { |
| String attribute = parser.expectAttribute(); |
| parser.expectEquals(); |
| String value = parser.expectValue(); |
| params.put(attribute.toLowerCase(), value); |
| } |
| } |
| |
| public int size() { |
| return params.size(); |
| } |
| |
| public boolean isEmpty() { |
| return params.isEmpty(); |
| } |
| |
| public String get(String name) { |
| return (String) params.get(name.toLowerCase()); |
| } |
| |
| public void set(String name, String value) { |
| params.put(name.toLowerCase(), value); |
| } |
| |
| public void remove(String name) { |
| params.remove(name.toLowerCase()); |
| } |
| |
| public Enumeration getNames() { |
| return Collections.enumeration(params.keySet()); |
| } |
| |
| /** |
| * String representation of this parameter list. |
| * |
| * @return |
| */ |
| public String toString() { |
| StringBuffer buf = new StringBuffer(params.size() << 4); |
| for (Iterator i = params.entrySet().iterator(); i.hasNext();) { |
| Map.Entry entry = (Map.Entry) i.next(); |
| buf.append("; ").append(entry.getKey()).append('='); |
| quote(buf, (String) entry.getValue()); |
| } |
| return buf.toString(); |
| } |
| |
| private void quote(StringBuffer buf, String value) { |
| int length = value.length(); |
| boolean quote = false; |
| for (int i = 0; i < length; i++) { |
| if (MimeType.isSpecial(value.charAt(i))) { |
| quote = true; |
| break; |
| } |
| } |
| if (quote) { |
| buf.append('"'); |
| for (int i = 0; i < length; i++) { |
| char c = value.charAt(i); |
| if (c == '\\' || c == '"') { |
| buf.append('\\'); |
| } |
| buf.append(c); |
| } |
| buf.append('"'); |
| } else { |
| buf.append(value); |
| } |
| } |
| |
| private static class RFC2045Parser { |
| private final String text; |
| private int index = 0; |
| |
| private RFC2045Parser(String text) { |
| this.text = text; |
| } |
| |
| /** |
| * Look the next ";" to start a parameter (skipping whitespace) |
| * |
| * @return |
| */ |
| private boolean hasMoreParams() throws MimeTypeParseException { |
| char c; |
| do { |
| if (index == text.length()) { |
| return false; |
| } |
| c = text.charAt(index++); |
| } while (Character.isWhitespace(c)); |
| if (c != ';') { |
| throw new MimeTypeParseException("Expected \";\" at " + (index - 1) + " in " + text); |
| } |
| return true; |
| } |
| |
| private String expectAttribute() throws MimeTypeParseException { |
| char c; |
| do { |
| if (index == text.length()) { |
| throw new MimeTypeParseException("Expected attribute at " + (index - 1) + " in " + text); |
| } |
| c = text.charAt(index++); |
| } while (Character.isWhitespace(c)); |
| int start = index - 1; |
| while (index != text.length() && !MimeType.isSpecial(text.charAt(index))) { |
| index += 1; |
| } |
| return text.substring(start, index); |
| } |
| |
| private void expectEquals() throws MimeTypeParseException { |
| char c; |
| do { |
| if (index == text.length()) { |
| throw new MimeTypeParseException("Expected \"=\" at " + (index - 1) + " in " + text); |
| } |
| c = text.charAt(index++); |
| } while (Character.isWhitespace(c)); |
| if (c != '=') { |
| throw new MimeTypeParseException("Expected \"=\" at " + (index - 1) + " in " + text); |
| } |
| } |
| |
| private String expectValue() throws MimeTypeParseException { |
| char c; |
| do { |
| if (index == text.length()) { |
| throw new MimeTypeParseException("Expected value at " + (index - 1) + " in " + text); |
| } |
| c = text.charAt(index++); |
| } while (Character.isWhitespace(c)); |
| if (c == '"') { |
| // quoted-string |
| StringBuffer buf = new StringBuffer(); |
| while (true) { |
| if (index == text.length()) { |
| throw new MimeTypeParseException("Expected closing quote at " + (index - 1) + " in " + text); |
| } |
| c = text.charAt(index++); |
| if (c == '"') { |
| break; |
| } |
| if (c == '\\') { |
| if (index == text.length()) { |
| throw new MimeTypeParseException("Expected escaped char at " + (index - 1) + " in " + text); |
| } |
| c = text.charAt(index++); |
| } |
| buf.append(c); |
| } |
| return buf.toString(); |
| } else { |
| // token |
| int start = index - 1; |
| while (index != text.length() && !MimeType.isSpecial(text.charAt(index))) { |
| index += 1; |
| } |
| return text.substring(start, index); |
| } |
| } |
| } |
| } |