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