net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/corext/textmanipulation/TextBufferFactory.java

   1 /*
   2  * (c) Copyright IBM Corp. 2000, 2001.
   3  * All Rights Reserved.
   4  */
   5 package net.sourceforge.phpdt.internal.corext.textmanipulation;
   6
   7 import java.io.BufferedInputStream;
   8 import java.io.IOException;
   9 import java.io.InputStream;
  10 import java.io.InputStreamReader;
  11 import java.util.HashMap;
  12 import java.util.Map;
  13
  14 import net.sourceforge.phpdt.internal.corext.util.IOCloser;
  15 import net.sourceforge.phpdt.internal.ui.PHPStatusConstants;
  16 import net.sourceforge.phpeclipse.PHPeclipsePlugin;
  17
  18 import org.eclipse.core.resources.IFile;
  19 import org.eclipse.core.resources.IWorkspaceRunnable;
  20 import org.eclipse.core.resources.ResourcesPlugin;
  21 import org.eclipse.core.runtime.CoreException;
  22 import org.eclipse.core.runtime.IProgressMonitor;
  23 import org.eclipse.core.runtime.IStatus;
  24 import org.eclipse.core.runtime.Status;
  25 import org.eclipse.jface.text.Document;
  26 import org.eclipse.jface.text.IDocument;
  27 import org.eclipse.jface.text.source.IAnnotationModel;
  28 import org.eclipse.jface.util.Assert;
  29 import org.eclipse.ui.part.FileEditorInput;
  30 import org.eclipse.ui.texteditor.IDocumentProvider;
  31
  32 /* package */ class TextBufferFactory {
  33
  34         private IDocumentProvider fDocumentProvider;
  35         private Map fFileValueMap;
  36         private Map fBufferValueMap;
  37
  38         private static class Value {
  39                 TextBuffer buffer;
  40                 FileEditorInput input;
  41                 IDocument document;
  42                 IAnnotationModel annotationModel;
  43                 int references;
  44                 public Value(TextBuffer b, FileEditorInput i, IDocument d, IAnnotationModel m) {
  45                         buffer= b;
  46                         input= i;
  47                         document= d;
  48                         annotationModel= m;
  49                 }
  50         }
  51
  52         public TextBufferFactory() {
  53                 // XXX http://dev.eclipse.org/bugs/show_bug.cgi?id=5170
  54                 // Need way to map a file to a document without knowing any kind of document provider.
  55                 this(PHPeclipsePlugin.getDefault().getCompilationUnitDocumentProvider());
  56         }
  57
  58         public TextBufferFactory(IDocumentProvider provider) {
  59                 fDocumentProvider= provider;
  60                 Assert.isNotNull(fDocumentProvider);
  61                 fFileValueMap= new HashMap(5);
  62                 fBufferValueMap= new HashMap(5);
  63         }
  64
  65         public TextBuffer acquire(IFile file) throws CoreException {
  66                 FileEditorInput input= new FileEditorInput(file);
  67
  68                 Value value= (Value)fFileValueMap.get(input);
  69                 if (value != null) {
  70                         value.references++;
  71                         return value.buffer;
  72                 }
  73
  74                 fDocumentProvider.connect(input);
  75                 IDocument document= fDocumentProvider.getDocument(input);
  76                 IAnnotationModel annotationModel= fDocumentProvider.getAnnotationModel(input);
  77                 annotationModel.connect(document);
  78                 value= new Value(new TextBuffer(document), input, document, annotationModel);
  79                 fFileValueMap.put(input, value);
  80                 fBufferValueMap.put(value.buffer, value);
  81                 value.references++;
  82                 return value.buffer;
  83         }
  84
  85         public void release(TextBuffer buffer) {
  86                 final Value value= (Value)fBufferValueMap.get(buffer);
  87                 if (value == null)
  88                         return;
  89
  90                 value.references--;
  91                 if (value.references == 0) {
  92                         buffer.release();
  93                         value.annotationModel.disconnect(value.document);
  94                         fDocumentProvider.disconnect(value.input);
  95                         fFileValueMap.remove(value.input);
  96                         fBufferValueMap.remove(buffer);
  97                 }
  98         }
  99
 100         public void commitChanges(TextBuffer buffer, boolean force, IProgressMonitor pm) throws CoreException {
 101                 final Value value= (Value)fBufferValueMap.get(buffer);
 102                 if (value == null)
 103                         return;
 104
 105                 boolean save= force || fDocumentProvider.mustSaveDocument(value.input);
 106                 if (save) {
 107                         IWorkspaceRunnable action= new IWorkspaceRunnable() {
 108                                 public void run(IProgressMonitor pm) throws CoreException {
 109                                         fDocumentProvider.aboutToChange(value.input);
 110                                         fDocumentProvider.saveDocument(pm, value.input, value.document, true);
 111                                 }
 112                         };
 113                         try {
 114                                 ResourcesPlugin.getWorkspace().run(action, pm);
 115                         } finally {
 116                                 fDocumentProvider.changed(value.input);
 117                         }
 118                 }
 119         }
 120
 121         public TextBuffer create(IFile file) throws CoreException {
 122                 FileEditorInput input= new FileEditorInput(file);
 123                 IDocument document= fDocumentProvider.getDocument(input);
 124                 if (document != null) {
 125                         return new TextBuffer(new Document(document.get()));
 126                 } else {
 127                         return createFromFile(file);
 128                 }
 129         }
 130
 131         private TextBuffer createFromFile(IFile file) throws CoreException {
 132                 IDocument document;
 133                 // Fix for http://dev.eclipse.org/bugs/show_bug.cgi?id=19319
 134                 InputStream stream= file.getContents();
 135                 InputStreamReader in= null;
 136                 try {
 137                         document= new Document();
 138                         in= new InputStreamReader(new BufferedInputStream(stream), ResourcesPlugin.getEncoding());
 139                         StringBuffer buffer= new StringBuffer();
 140                         char[] readBuffer= new char[2048];
 141                         int n= in.read(readBuffer);
 142                         while (n > 0) {
 143                                 buffer.append(readBuffer, 0, n);
 144                                 n= in.read(readBuffer);
 145                         }
 146                         document.set(buffer.toString());
 147                         return new TextBuffer(document);
 148                 } catch (IOException x) {
 149                         IStatus s= new Status(IStatus.ERROR, PHPeclipsePlugin.getPluginId(), PHPStatusConstants.INTERNAL_ERROR, x.getMessage(), x);
 150                         throw new CoreException(s);
 151                 } finally {
 152                         IOCloser.perform(in, stream);
 153                 }
 154         }
 155
 156         public TextBuffer create(String content) {
 157                 return new TextBuffer(new Document(content));
 158         }
 159
 160         public void save(TextBuffer buffer, IProgressMonitor pm) throws CoreException {
 161                 Value value= (Value)fBufferValueMap.get(buffer);
 162                 if (value == null)
 163                         throwNotManaged();
 164                 fDocumentProvider.saveDocument(pm, value.input, value.document, true);
 165         }
 166
 167         public void aboutToChange(TextBuffer buffer) throws CoreException {
 168                 Value value= (Value)fBufferValueMap.get(buffer);
 169                 if (value == null)
 170                         throwNotManaged();
 171                 fDocumentProvider.aboutToChange(value.input);
 172         }
 173
 174         public void changed(TextBuffer buffer) throws CoreException {
 175                 Value value= (Value)fBufferValueMap.get(buffer);
 176                 if (value == null)
 177                         throwNotManaged();
 178                 fDocumentProvider.changed(value.input);
 179         }
 180
 181         private void throwNotManaged() throws CoreException {
 182                 IStatus s= new Status(IStatus.ERROR, PHPeclipsePlugin.getPluginId(),
 183                         PHPStatusConstants.INTERNAL_ERROR, TextManipulationMessages.getString("TextBufferFactory.bufferNotManaged"), null); //$NON-NLS-1$
 184                 throw new CoreException(s);
 185         }
 186 }
 187