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Java > Open Source Codes > org > eclipse > jdt > internal > ui > text > java > JavaFormattingStrategy


1 /*******************************************************************************
2  * Copyright (c) 2000, 2007 IBM Corporation and others.
3  * All rights reserved. This program and the accompanying materials
4  * are made available under the terms of the Eclipse Public License v1.0
5  * which accompanies this distribution, and is available at
6  * http://www.eclipse.org/legal/epl-v10.html
7  *
8  * Contributors:
9  * IBM Corporation - initial API and implementation
10  *******************************************************************************/
11 package org.eclipse.jdt.internal.ui.text.java;
12
13 import java.util.LinkedList JavaDoc;
14 import java.util.Map JavaDoc;
15
16 import org.eclipse.text.edits.MalformedTreeException;
17 import org.eclipse.text.edits.TextEdit;
18
19 import org.eclipse.jface.text.BadLocationException;
20 import org.eclipse.jface.text.IDocument;
21 import org.eclipse.jface.text.TextUtilities;
22 import org.eclipse.jface.text.TypedPosition;
23 import org.eclipse.jface.text.formatter.ContextBasedFormattingStrategy;
24 import org.eclipse.jface.text.formatter.FormattingContextProperties;
25 import org.eclipse.jface.text.formatter.IFormattingContext;
26
27 import org.eclipse.jdt.core.formatter.CodeFormatter;
28
29 import org.eclipse.jdt.internal.corext.util.CodeFormatterUtil;
30 import org.eclipse.jdt.internal.ui.JavaPlugin;
31
32 /**
33  * Formatting strategy for java source code.
34  *
35  * @since 3.0
36  */
37 public class JavaFormattingStrategy extends ContextBasedFormattingStrategy {
38
39     /** Documents to be formatted by this strategy */
40     private final LinkedList JavaDoc fDocuments= new LinkedList JavaDoc();
41     /** Partitions to be formatted by this strategy */
42     private final LinkedList JavaDoc fPartitions= new LinkedList JavaDoc();
43
44     /**
45      * Creates a new java formatting strategy.
46      */
47     public JavaFormattingStrategy() {
48         super();
49     }
50
51     /*
52      * @see org.eclipse.jface.text.formatter.ContextBasedFormattingStrategy#format()
53      */
54     public void format() {
55         super.format();
56
57         final IDocument document= (IDocument)fDocuments.removeFirst();
58         final TypedPosition partition= (TypedPosition)fPartitions.removeFirst();
59
60         if (document != null && partition != null) {
61             Map JavaDoc partitioners= null;
62             try {
63
64                 final TextEdit edit= CodeFormatterUtil.reformat(CodeFormatter.K_COMPILATION_UNIT, document.get(), partition.getOffset(), partition.getLength(), 0, TextUtilities.getDefaultLineDelimiter(document), getPreferences());
65                 if (edit != null) {
66                     if (edit.getChildrenSize() > 20)
67                         partitioners= TextUtilities.removeDocumentPartitioners(document);
68
69                     edit.apply(document);
70                 }
71
72             } catch (MalformedTreeException exception) {
73                 JavaPlugin.log(exception);
74             } catch (BadLocationException exception) {
75                 // Can only happen on concurrent document modification - log and bail out
76 JavaPlugin.log(exception);
77             } finally {
78                 if (partitioners != null)
79                     TextUtilities.addDocumentPartitioners(document, partitioners);
80             }
81         }
82     }
83
84     /*
85      * @see org.eclipse.jface.text.formatter.ContextBasedFormattingStrategy#formatterStarts(org.eclipse.jface.text.formatter.IFormattingContext)
86      */
87     public void formatterStarts(final IFormattingContext context) {
88         super.formatterStarts(context);
89
90         fPartitions.addLast(context.getProperty(FormattingContextProperties.CONTEXT_PARTITION));
91         fDocuments.addLast(context.getProperty(FormattingContextProperties.CONTEXT_MEDIUM));
92     }
93
94     /*
95      * @see org.eclipse.jface.text.formatter.ContextBasedFormattingStrategy#formatterStops()
96      */
97     public void formatterStops() {
98         super.formatterStops();
99
100         fPartitions.clear();
101         fDocuments.clear();
102     }
103 }
104
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