bundles/org.simantics.databoard/src/org/simantics/databoard/accessor/binary/BinaryString.java

   1 /*******************************************************************************
   2  *  Copyright (c) 2010 Association for Decentralized Information Management in
   3  *  Industry THTH ry.
   4  *  All rights reserved. This program and the accompanying materials
   5  *  are made available under the terms of the Eclipse Public License v1.0
   6  *  which accompanies this distribution, and is available at
   7  *  http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  *  Contributors:
  10  *      VTT Technical Research Centre of Finland - initial API and implementation
  11  *******************************************************************************/
  12 package org.simantics.databoard.accessor.binary;
  13
  14 import java.io.IOException;
  15
  16 import org.simantics.databoard.Bindings;
  17 import org.simantics.databoard.accessor.Accessor;
  18 import org.simantics.databoard.accessor.StringAccessor;
  19 import org.simantics.databoard.accessor.error.AccessorConstructionException;
  20 import org.simantics.databoard.accessor.error.AccessorException;
  21 import org.simantics.databoard.accessor.error.ReferenceException;
  22 import org.simantics.databoard.accessor.event.Event;
  23 import org.simantics.databoard.accessor.event.ValueAssigned;
  24 import org.simantics.databoard.accessor.file.FileStringAccessor;
  25 import org.simantics.databoard.accessor.impl.AccessorParams;
  26 import org.simantics.databoard.accessor.impl.ListenerEntry;
  27 import org.simantics.databoard.accessor.interestset.StringInterestSet;
  28 import org.simantics.databoard.accessor.reference.ChildReference;
  29 import org.simantics.databoard.binding.Binding;
  30 import org.simantics.databoard.binding.StringBinding;
  31 import org.simantics.databoard.binding.error.BindingException;
  32 import org.simantics.databoard.type.StringType;
  33 import org.simantics.databoard.util.binary.Blob;
  34 import org.simantics.databoard.util.binary.Endian;
  35 import org.simantics.databoard.util.binary.UTF8;
  36
  37 public class BinaryString extends BinaryObject implements StringAccessor, FileStringAccessor {
  38
  39         public BinaryString(BinaryObject parent, Blob blob, StringType type, AccessorParams params)
  40         throws AccessorConstructionException {
  41                 super(parent, blob, type, params);
  42         }
  43
  44         @Override
  45         public StringType type() {
  46                 return (StringType) type;
  47         }
  48
  49         @Override
  50         Event applyLocal(Event e, boolean makeRollback) throws AccessorException {
  51                 Event rollback = makeRollback ? new ValueAssigned( Bindings.STRING, getValue() ) : null;
  52                 if (e instanceof ValueAssigned) {
  53                         ValueAssigned va = (ValueAssigned) e;
  54                         if (va.newValue == null) throw new AccessorException("String value expected, got null");
  55                         setValueNoflush(va.newValue.getBinding(), va.newValue.getValue());
  56                         return rollback;
  57                 } else {
  58                         throw new AccessorException("Cannot apply "+e.getClass().getName()+" to String");
  59                 }
  60         }
  61
  62         @SuppressWarnings("unchecked")
  63         @Override
  64         public <T extends Accessor> T getComponent(ChildReference reference)
  65                         throws AccessorConstructionException {
  66                 if (reference==null) return (T) this;
  67                 throw new ReferenceException(reference.getClass()+" is not a subreference of StringType");
  68         }
  69
  70         @Override
  71         public Object getValue(Binding binding) throws AccessorException {
  72                 try {
  73                         StringBinding bb = (StringBinding) binding;
  74                         String v = getValue();
  75                         return bb.create(v);
  76                 } catch(BindingException e) {
  77                         throw new AccessorException(e);
  78                 }
  79         }
  80 // MODIFIED UTF-8
  81         @Override
  82         public String getValue() throws AccessorException {
  83                 assert b.isOpen();
  84                 readLock();
  85                 try {
  86                         b.position(0L);
  87
  88                         int utflen = Endian.readDynamicUInt32(b);
  89                         return UTF8.readModifiedUTF(b, utflen);
  90                 } catch (IOException e) {
  91                         throw new AccessorException(e);
  92                 } finally {
  93                         readUnlock();
  94                 }
  95         }
  96
  97         public void setValueNoflush(String string) throws AccessorException {
  98                 assert b.isOpen();
  99                 writeLock();
 100                 try {
 101                         // Write
 102                         b.position(0);
 103                         int strlen = UTF8.getModifiedUTF8EncodingByteLength(string);
 104                         int lenlen = Endian.getDynamicUInt32Length(strlen);
 105                         b.setLength(strlen+lenlen);
 106                         Endian.writeDynamicUInt32(b, strlen);
 107                         UTF8.writeModifiedUTF(b, string);
 108
 109                         // Notify
 110                         ListenerEntry le = listeners;
 111                         while (le!=null) {
 112                                 StringInterestSet is = le.getInterestSet();
 113                                 if (is.inNotifications()) {
 114                                         Event e = new ValueAssigned( Bindings.STRING, is.inValues() ? string : null );
 115                                         emitEvent(le, e);
 116                                 }
 117                                 le = le.next;
 118                         }
 119
 120                 } catch (IOException e) {
 121                         throw new AccessorException(e);
 122                 } finally {
 123                         writeUnlock();
 124                 }
 125         }
 126
 127 /* REAL UTF-8
 128         @Override
 129         public String getValue() throws AccessorException {
 130                 readLock();
 131                 try {
 132                         b.position(0L);
 133                         int length = UTF8StringSerializer.getLength(b);
 134                         byte[] bytes = new byte[length];
 135                         b.readFully(bytes);
 136                         return new String(bytes, UTF8StringSerializer.UTF8);
 137                 } catch (IOException e) {
 138                         throw new AccessorException(e);
 139                 } finally {
 140                         readUnlock();
 141                 }
 142         }
 143
 144         public void setValueNoflush(String string) throws AccessorException {
 145                 writeLock();
 146                 try {
 147                         // Write
 148                         int stringByteLength = UTF8StringSerializer.getUTF8EncodingByteLength( string );
 149                         int lengthLength = UTF8StringSerializer.getSizeOfPutLength( stringByteLength );
 150                         int len = stringByteLength + lengthLength;
 151
 152                         b.position(0);
 153                         b.setLength(len);
 154                         byte[] bytes = string.getBytes( UTF8StringSerializer.UTF8 );
 155                         UTF8StringSerializer.putLength(b, bytes.length);
 156                         b.put(bytes);
 157
 158                         // Notify
 159                         ListenerEntry le = listeners;
 160                         while (le!=null) {
 161                                 StringInterestSet is = le.getInterestSet();
 162                                 if (is.inNotifications()) {
 163                                         Event e = new ValueAssigned( Bindings.STRING, is.inValues() ? string : null );
 164                                         emitEvent(le, e);
 165                                 }
 166                                 le = le.next;
 167                         }
 168
 169                 } catch (IOException e) {
 170                         throw new AccessorException(e);
 171                 } finally {
 172                         writeUnlock();
 173                 }
 174         }
 175 */
 176         @Override
 177         public void setValue(String string) throws AccessorException {
 178                 assert b.isOpen();
 179                 writeLock();
 180                 try {
 181                         setValueNoflush(string);
 182                         b.flush();
 183                 } catch (IOException e) {
 184                         throw new AccessorException(e);
 185                 } finally {
 186                         writeUnlock();
 187                 }
 188         }
 189
 190         @Override
 191         public void setValueNoflush(Binding binding, Object newValue)
 192                         throws AccessorException {
 193                 try {
 194                         String nv = ((StringBinding)binding).getValue(newValue);
 195                         setValueNoflush(nv);
 196                 } catch (BindingException e) {
 197                         throw new AccessorException(e);
 198                 }
 199         }
 200
 201 }
 202