runtime/org.argeo.slc.core/src/main/java/org/argeo/slc/core/execution/SedFilteredResource.java

   1 /*
   2  * Copyright (C) 2007-2012 Mathieu Baudier
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *         http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package org.argeo.slc.core.execution;
  17
  18 import java.io.File;
  19 import java.io.FileInputStream;
  20 import java.io.IOException;
  21 import java.nio.ByteBuffer;
  22 import java.nio.CharBuffer;
  23 import java.nio.channels.FileChannel;
  24 import java.nio.charset.Charset;
  25 import java.nio.charset.CharsetDecoder;
  26 import java.util.ArrayList;
  27 import java.util.HashMap;
  28 import java.util.List;
  29 import java.util.Map;
  30 import java.util.StringTokenizer;
  31 import java.util.regex.Matcher;
  32 import java.util.regex.Pattern;
  33
  34 import org.apache.commons.io.IOUtils;
  35 import org.argeo.slc.SlcException;
  36 import org.springframework.beans.factory.FactoryBean;
  37 import org.springframework.beans.factory.InitializingBean;
  38 import org.springframework.core.io.ByteArrayResource;
  39 import org.springframework.core.io.Resource;
  40
  41 /** Experimental and suboptimal */
  42 public class SedFilteredResource implements FactoryBean, InitializingBean {
  43         private Resource source;
  44
  45         private List<String> filters = new ArrayList<String>();
  46         private Map<Pattern, String> patterns = new HashMap<Pattern, String>();
  47
  48         private String charset = "UTF-8";
  49         private Charset cs;
  50         private CharsetDecoder decoder;
  51         //private CharsetEncoder encoder;
  52
  53         public Object getObject() throws Exception {
  54                 if (filters.size() == 0)
  55                         return source;
  56
  57                 //int capacity = 100 * 1024;// 100 KB
  58                 ByteBuffer bb;
  59                 if (source instanceof ByteArrayResource) {
  60                         bb = ByteBuffer.wrap(((ByteArrayResource) source).getByteArray());
  61                 } else {
  62                         try {
  63                                 File file = source.getFile();
  64                                 FileInputStream fis = new FileInputStream(file);
  65                                 FileChannel fc = fis.getChannel();
  66
  67                                 // Get the file's size and then map it into memory
  68                                 int sz = (int) fc.size();
  69                                 bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, sz);
  70                         } catch (IOException e) {
  71                                 // ReadableByteChannel channel = Channels.newChannel(source
  72                                 // .getInputStream());
  73                                 // bb = ByteBuffer.allocateDirect(capacity);
  74                                 // int read = 0;
  75                                 // do {
  76                                 // read = channel.read(bb);
  77                                 // } while (read > 0);
  78                                 // FIXME : use nio to parse the stream as it goes
  79                                 bb = ByteBuffer.wrap(IOUtils.toByteArray(source
  80                                                 .getInputStream()));
  81                         }
  82                 }
  83                 CharBuffer cb = decoder.decode(bb);
  84                 for (Pattern pattern : patterns.keySet()) {
  85                         Matcher matcher = pattern.matcher(cb);
  86                         String output = matcher.replaceAll(patterns.get(pattern));
  87                         cb = CharBuffer.wrap(output);
  88                 }
  89 //              ByteBuffer bbout = encoder.encode(cb);
  90 //              ByteArrayOutputStream out = new ByteArrayOutputStream(capacity);
  91 //              WritableByteChannel wchannel = Channels.newChannel(out);
  92 //              wchannel.write(bbout);
  93                 ByteArrayResource res = new ByteArrayResource(cb.toString().getBytes());
  94                 return res;
  95         }
  96
  97         public Class<?> getObjectType() {
  98                 return Resource.class;
  99         }
 100
 101         public boolean isSingleton() {
 102                 return true;
 103         }
 104
 105         public void afterPropertiesSet() throws Exception {
 106                 cs = Charset.forName(charset);
 107                 decoder = cs.newDecoder();
 108                 //encoder = cs.newEncoder();
 109
 110                 for (String sedStr : filters) {
 111                         sedStr = sedStr.trim();
 112                         if (sedStr.length() < 4)
 113                                 throw new SlcException(sedStr + " not properly formatted.");
 114                         if (sedStr.charAt(0) != 's')
 115                                 throw new SlcException(sedStr + " not properly formatted.");
 116                         Character sep = sedStr.charAt(1);
 117                         List<String> tokens = new ArrayList<String>(4);
 118                         StringTokenizer st = new StringTokenizer(sedStr, sep.toString());
 119                         while (st.hasMoreTokens())
 120                                 tokens.add(st.nextToken());
 121                         if (tokens.size() != 3 && tokens.size() != 4)
 122                                 throw new SlcException(sedStr + " not properly formatted.");
 123                         patterns.put(Pattern.compile(tokens.get(1)), tokens.get(2));
 124                 }
 125         }
 126
 127         public void setSource(Resource source) {
 128                 this.source = source;
 129         }
 130
 131         public void setFilters(List<String> filters) {
 132                 this.filters = filters;
 133         }
 134
 135         public void setCharset(String charset) {
 136                 this.charset = charset;
 137         }
 138
 139 }