001/* ***** BEGIN LICENSE BLOCK *****
002 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
003 *
004 * The contents of this file are subject to the Mozilla Public License Version
005 * 1.1 (the "License"); you may not use this file except in compliance with
006 * the License. You may obtain a copy of the License at
007 * http://www.mozilla.org/MPL/
008 *
009 * Software distributed under the License is distributed on an "AS IS" basis,
010 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
011 * for the specific language governing rights and limitations under the
012 * License.
013 *
014 * The Original Code is part of dcm4che, an implementation of DICOM(TM) in
015 * Java(TM), hosted at https://github.com/gunterze/dcm4che.
016 *
017 * The Initial Developer of the Original Code is
018 * Agfa Healthcare.
019 * Portions created by the Initial Developer are Copyright (C) 2011
020 * the Initial Developer. All Rights Reserved.
021 *
022 * Contributor(s):
023 * See @authors listed below
024 *
025 * Alternatively, the contents of this file may be used under the terms of
026 * either the GNU General Public License Version 2 or later (the "GPL"), or
027 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
028 * in which case the provisions of the GPL or the LGPL are applicable instead
029 * of those above. If you wish to allow use of your version of this file only
030 * under the terms of either the GPL or the LGPL, and not to allow others to
031 * use your version of this file under the terms of the MPL, indicate your
032 * decision by deleting the provisions above and replace them with the notice
033 * and other provisions required by the GPL or the LGPL. If you do not delete
034 * the provisions above, a recipient may use your version of this file under
035 * the terms of any one of the MPL, the GPL or the LGPL.
036 *
037 * ***** END LICENSE BLOCK ***** */
038
039package org.dcm4che3.util;
040
041import java.io.UnsupportedEncodingException;
042import java.net.URLEncoder;
043import java.text.FieldPosition;
044import java.text.Format;
045import java.text.MessageFormat;
046import java.text.ParsePosition;
047import java.util.ArrayList;
048import java.util.Date;
049import java.util.StringTokenizer;
050
051import org.dcm4che3.data.Attributes;
052
053
054/**
055 * @author Gunter Zeilinger <gunterze@gmail.com>
056 */
057public class AttributesFormat extends Format {
058
059    private static final long serialVersionUID = 1901510733531643054L;
060
061    private final String pattern;
062    private final int[][] tagPaths;
063    private final int[] index;
064    private final Type[] types;
065    private final MessageFormat format;
066
067    public AttributesFormat(String pattern) {
068        ArrayList<String> tokens = tokenize(pattern);
069        int n = tokens.size() / 2;
070        this.pattern = pattern;
071        this.tagPaths = new int[n][];
072        this.index = new int[n];
073        this.types = new Type[n];
074        this.format = buildMessageFormat(tokens);
075    }
076
077    private ArrayList<String> tokenize(String s) {
078        ArrayList<String> result = new ArrayList<String>();
079        StringTokenizer stk = new StringTokenizer(s, "{}", true);
080        String tk;
081        char delim;
082        char prevDelim = '}';
083        int level = 0;
084        StringBuilder sb = new StringBuilder();
085        while (stk.hasMoreTokens()) {
086            tk = stk.nextToken();
087            delim = tk.charAt(0);
088            if (delim == '{') {
089                if (level++ == 0) {
090                    if (prevDelim == '}')
091                        result.add("");
092                } else {
093                    sb.append(delim);
094                }
095            } else if (delim == '}') {
096                if (--level == 0) {
097                    result.add(sb.toString());
098                    sb.setLength(0);
099                } else if (level > 0){
100                    sb.append(delim);
101                } else
102                    throw new IllegalArgumentException(s);
103            } else {
104                if (level == 0)
105                    result.add(tk);
106                else
107                    sb.append(tk);
108            }
109            prevDelim = delim;
110        }
111        return result;
112    }
113
114    private MessageFormat buildMessageFormat(ArrayList<String> tokens) {
115        StringBuilder formatBuilder = new StringBuilder(pattern.length());
116        int j = 0;
117        for (int i = 0; i < tagPaths.length; i++) {
118            formatBuilder.append(tokens.get(j++)).append('{').append(i);
119            String tagStr = tokens.get(j++);
120            int typeStart = tagStr.indexOf(',') + 1;
121            if (!tagStr.startsWith("now")) {
122                int tagStrLen = typeStart != 0
123                        ? typeStart - 1
124                        : tagStr.length();
125                
126                int indexStart = tagStr.charAt(tagStrLen-1) == ']'
127                        ? tagStr.lastIndexOf('[', tagStrLen-3) + 1 
128                        : 0;
129                try {
130                    tagPaths[i] = TagUtils.parseTagPath(tagStr.substring(0, indexStart != 0 ? indexStart - 1 : tagStrLen));
131                    if (indexStart != 0)
132                        index[i] = Integer.parseInt(tagStr.substring(indexStart, tagStrLen-1));
133                } catch (IllegalArgumentException e) {
134                    throw new IllegalArgumentException(pattern);
135                }
136            }
137            if (typeStart != 0) {
138                int typeEnd = tagStr.indexOf(',', typeStart);
139                try {
140                    types[i] = Type.valueOf(tagStr.substring(typeStart,
141                            typeEnd < 0 ? tagStr.length() : typeEnd));
142                } catch (IllegalArgumentException e) {
143                    throw new IllegalArgumentException(pattern);
144                }
145                if (types[i] != Type.hash && types[i] != Type.urlencoded)
146                    formatBuilder.append(
147                            typeStart > 0 ? tagStr.substring(typeStart-1) : tagStr);
148            } else {
149                types[i] = Type.none;
150            }
151            formatBuilder.append('}');
152        }
153        if (j < tokens.size())
154            formatBuilder.append(tokens.get(j));
155        try {
156            return new MessageFormat(formatBuilder.toString());
157        } catch (IllegalArgumentException e) {
158            throw new IllegalArgumentException(pattern);
159        }
160    }
161
162    public static AttributesFormat valueOf(String s) {
163        return s != null ? new AttributesFormat(s) : null;
164    }
165
166    @Override
167    public StringBuffer format(Object obj, StringBuffer result, FieldPosition pos) {
168        return format.format(toArgs((Attributes) obj), result, pos);
169    }
170
171    private Object[] toArgs(Attributes attrs) {
172        Object[] args = new Object[tagPaths.length];
173        for (int i = 0; i < args.length; i++) {
174            int[] tagPath = tagPaths[i];
175            if (tagPath == null) { // now
176                args[i] = types[i].toArg(attrs, 0, index[i]);
177            } else {
178                int last = tagPath.length - 1;
179                Attributes item = attrs;
180                for (int j = 0; j < last && item != null; j++) {
181                    item = item.getNestedDataset(tagPath[j]);
182                }
183                args[i] = item != null ? types[i].toArg(item, tagPath[last], index[i]) : null;
184            }
185        }
186        return args;
187    }
188
189    @Override
190    public Object parseObject(String source, ParsePosition pos) {
191        throw new UnsupportedOperationException();
192    }
193
194    @Override
195    public String toString() {
196        return pattern;
197    }
198
199    private static enum Type {
200        none {
201            @Override
202            Object toArg(Attributes attrs, int tag, int index) {
203                return attrs.getString(tag, index);
204            }
205        },
206        number {
207            @Override
208            Object toArg(Attributes attrs, int tag, int index) {
209                return attrs.getDouble(tag, index, 0.);
210            }
211        },
212        date {
213            @Override
214            Object toArg(Attributes attrs, int tag, int index) {
215                return tag != 0 ? attrs.getDate(tag, index) : new Date();
216            }
217        },
218        time {
219            @Override
220            Object toArg(Attributes attrs, int tag, int index) {
221                return tag != 0 ? attrs.getDate(tag, index) : new Date();
222            }
223        },
224        choice {
225            @Override
226            Object toArg(Attributes attrs, int tag, int index) {
227                return attrs.getDouble(tag, index, 0.);
228            }
229        },
230        hash {
231            @Override
232            Object toArg(Attributes attrs, int tag, int index) {
233                String s = attrs.getString(tag, index);
234                return s != null ? TagUtils.toHexString(s.hashCode()) : null;
235            }
236        },
237        urlencoded {
238            @Override
239            Object toArg(Attributes attrs, int tag, int index) {
240                String s = attrs.getString(tag, index);
241                try {
242                    return s != null ? URLEncoder.encode(s, "UTF-8") : null;
243                } catch (UnsupportedEncodingException e) {
244                    throw new AssertionError(e);
245                }
246            }
247        };
248
249        abstract Object toArg(Attributes attrs, int tag, int index);
250    }
251
252}