Package org.eclipse.jface.text.formatter

## Class MultiPassContentFormatter

- java.lang.Object
- - org.eclipse.jface.text.formatter.MultiPassContentFormatter

All Implemented Interfaces:
  `IContentFormatter`, `IContentFormatterExtension`

    public class MultiPassContentFormatter
    extends Object
    implements IContentFormatter, IContentFormatterExtension

Content formatter for edit-based formatting strategies.

Two kinds of formatting strategies can be registered with this formatter:

- one master formatting strategy for the default content type
- one formatting strategy for each non-default content type

The master formatting strategy always formats the whole region to be formatted in the first pass. In a second pass, all partitions of the region to be formatted that are not of master content type are formatted using the slave formatting strategy registered for the underlying content type. All formatting strategies must implement `IFormattingStrategyExtension`.

Regions to be formatted with the master formatting strategy always have an offset aligned to the line start. Regions to be formatted with slave formatting strategies are aligned on partition boundaries.

Since:
  3.0
See Also:
  `IFormattingStrategyExtension`

### Nested Class Summary

Nested Classes
`protected class` `MultiPassContentFormatter.NonDeletingPositionUpdater` Position updater that shifts otherwise deleted positions to the next non-whitespace character.

### Constructor Summary

Constructors
`MultiPassContentFormatter​(String partitioning, String type)` Creates a new content formatter.

### Method Summary

All Methods Instance Methods Concrete Methods
`void` `format​(IDocument medium, IFormattingContext context)` Formats the given region of the specified document.
`void` `format​(IDocument medium, IRegion region)` Formats the given region of the specified document.The formatter may safely assume that it is the only subject that modifies the document at this point in time.
`protected void` `formatMaster​(IFormattingContext context, IDocument document, int offset, int length)` Formats the document specified in the formatting context with the master formatting strategy.
`protected void` `formatSlave​(IFormattingContext context, IDocument document, int offset, int length, String type)` Formats the document specified in the formatting context with the formatting strategy registered for the content type.
`protected void` `formatSlaves​(IFormattingContext context, IDocument document, int offset, int length)` Formats the document specified in the formatting context with the slave formatting strategies.
`IFormattingStrategy` `getFormattingStrategy​(String type)` Returns the formatting strategy registered for the given content type.
`void` `setMasterStrategy​(IFormattingStrategy strategy)` Registers a master formatting strategy.
`void` `setSlaveStrategy​(IFormattingStrategy strategy, String type)` Registers a slave formatting strategy for a certain content type.

### Methods inherited from class java.lang.Object

`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

### Constructor Detail

#### MultiPassContentFormatter

    public MultiPassContentFormatter​(String partitioning,
                                     String type)

Creates a new content formatter.

Parameters:
  `partitioning` - the document partitioning for this formatter
  `type` - the default content type

### Method Detail

#### format

    public final void format​(IDocument medium,
                             IFormattingContext context)

Description copied from interface: `IContentFormatterExtension`
Formats the given region of the specified document.

The formatter may safely assume that it is the only subject that modifies the document at this point in time. This method is fully reentrant, but not thread-safe.

The formatting process performed by `format(IDocument, IFormattingContext)` happens as follows:

- In a first pass the content formatter formats the range of the document to be formatted by using the master formatting strategy. This happens regardless of the content type of the underlying partition.
- In the second pass, the range is formatted again, this time using the registered slave formatting strategies. For each partition contained in the range to be formatted, the content formatter determines its content type and formats the partition with the correct formatting strategy.

Specified by:
  `format` in interface `IContentFormatterExtension`
Parameters:
  `medium` - the document to be formatted
  `context` - the formatting context to pass to the formatting strategies. This argument must not be `null`.

#### format

    public final void format​(IDocument medium,
                             IRegion region)

Description copied from interface: `IContentFormatter`
Formats the given region of the specified document.The formatter may safely assume that it is the only subject that modifies the document at this point in time.

Specified by:
  `format` in interface `IContentFormatter`
Parameters:
  `medium` - the document to be formatted
  `region` - the region within the document to be formatted

#### formatMaster

    protected void formatMaster​(IFormattingContext context,
                                IDocument document,
                                int offset,
                                int length)

Formats the document specified in the formatting context with the master formatting strategy.

The master formatting strategy covers all regions of the document. The offset of the region to be formatted is aligned on line start boundaries, whereas the end index of the region remains the same. For this formatting type the document partitioning is not taken into account.

Parameters:
  `context` - The formatting context to use
  `document` - The document to operate on
  `offset` - The offset of the region to format
  `length` - The length of the region to format

#### formatSlave

    protected void formatSlave​(IFormattingContext context,
                               IDocument document,
                               int offset,
                               int length,
                               String type)

Formats the document specified in the formatting context with the formatting strategy registered for the content type.

For this formatting type only slave strategies are used. The region to be formatted is aligned on partition boundaries of the underlying content type. The exact formatting strategy is determined by the underlying content type of the document partitioning.

Parameters:
  `context` - The formatting context to use
  `document` - The document to operate on
  `offset` - The offset of the region to format
  `length` - The length of the region to format
  `type` - The content type of the region to format

#### formatSlaves

    protected void formatSlaves​(IFormattingContext context,
                                IDocument document,
                                int offset,
                                int length)

Formats the document specified in the formatting context with the slave formatting strategies.

For each content type of the region to be formatted in the document partitioning, the registered slave formatting strategy is used to format that particular region. The region to be formatted is aligned on partition boundaries of the underlying content type. If the content type is the document's default content type, nothing happens.

Parameters:
  `context` - The formatting context to use
  `document` - The document to operate on
  `offset` - The offset of the region to format
  `length` - The length of the region to format

#### getFormattingStrategy

    public final IFormattingStrategy getFormattingStrategy​(String type)

Description copied from interface: `IContentFormatter`
Returns the formatting strategy registered for the given content type.

Specified by:
  `getFormattingStrategy` in interface `IContentFormatter`
Parameters:
  `type` - the content type for which to look up the formatting strategy
Returns:
  the formatting strategy for the given content type, or `null` if there is no such strategy

#### setMasterStrategy

    public final void setMasterStrategy​(IFormattingStrategy strategy)

Registers a master formatting strategy.

The strategy may already be registered with a certain content type as slave strategy. The master strategy is registered for the default content type of documents. If a master strategy has already been registered, it is overridden by the new one.

Parameters:
  `strategy` - The master formatting strategy, must implement `IFormattingStrategyExtension`

#### setSlaveStrategy

    public final void setSlaveStrategy​(IFormattingStrategy strategy,
                                       String type)

Registers a slave formatting strategy for a certain content type.

The strategy may already be registered as master strategy. An already registered slave strategy for the specified content type will be replaced. However, the same strategy may be registered with several content types. Slave strategies cannot be registered for the default content type of documents.

Parameters:
  `strategy` - The slave formatting strategy
  `type` - The content type to register this strategy with, must implement `IFormattingStrategyExtension`