## com.lowagie.text.pdf
Class PdfLayerMembership

    java.lang.Object
      com.lowagie.text.pdf.PdfObject
          com.lowagie.text.pdf.PdfDictionary
              com.lowagie.text.pdf.PdfLayerMembership

All Implemented Interfaces:
  PdfOCG

    public class PdfLayerMembership

extends PdfDictionary
implements PdfOCG

Content typically belongs to a single optional content group, and is visible when the group is ON and invisible when it is OFF. To express more complex visibility policies, content should not declare itself to belong to an optional content group directly, but rather to an optional content membership dictionary represented by this class.

Author:
  Paulo Soares (psoares@consiste.pt)

Field Summary
`static PdfName` `ALLOFF` Visible only if all of the entries are OFF.
`static PdfName` `ALLON` Visible only if all of the entries are ON.
`static PdfName` `ANYOFF` Visible if any of the entries are OFF.
`static PdfName` `ANYON` Visible if any of the entries are ON.
`(package private) java.util.HashSet` `layers`
`(package private) PdfArray` `members`
`(package private) PdfIndirectReference` `ref`

Fields inherited from class com.lowagie.text.pdf.PdfDictionary
`CATALOG, FONT, hashMap, OUTLINES, PAGE, PAGES`

Fields inherited from class com.lowagie.text.pdf.PdfObject
`ARRAY, BOOLEAN, bytes, DICTIONARY, INDIRECT, indRef, NAME, NOTHING, NULL, NUMBER, STREAM, STRING, TEXT_PDFDOCENCODING, TEXT_UNICODE, type`

Constructor Summary
`PdfLayerMembership(PdfWriter writer)` Creates a new, empty, membership layer.

Method Summary
`void` `addMember(PdfLayer layer)` Adds a new member to the layer.
`java.util.Collection` `getLayers()` Gets the member layers.
`PdfObject` `getPdfObject()` Gets the dictionary representing the membership layer.
`PdfIndirectReference` `getRef()` Gets the `PdfIndirectReference` that represents this membership layer.
`void` `setVisibilityPolicy(PdfName type)` Sets the visibility policy for content belonging to this membership dictionary.

Methods inherited from class com.lowagie.text.pdf.PdfDictionary
`contains, get, getAsArray, getAsBoolean, getAsDict, getAsIndirectObject, getAsName, getAsNumber, getAsStream, getAsString, getDirectObject, getKeys, isCatalog, isFont, isOutlineTree, isPage, isPages, merge, mergeDifferent, put, putAll, putEx, remove, size, toPdf, toString`

Methods inherited from class com.lowagie.text.pdf.PdfObject
`canBeInObjStm, getBytes, getIndRef, isArray, isBoolean, isDictionary, isIndirect, isName, isNull, isNumber, isStream, isString, length, setContent, setIndRef, type`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Field Detail

### ALLON

    public static final PdfName ALLON

  Visible only if all of the entries are ON.

### ANYON

    public static final PdfName ANYON

  Visible if any of the entries are ON.

### ANYOFF

    public static final PdfName ANYOFF

  Visible if any of the entries are OFF.

### ALLOFF

    public static final PdfName ALLOFF

  Visible only if all of the entries are OFF.

### ref

    PdfIndirectReference ref

### members

    PdfArray members

### layers

    java.util.HashSet layers

Constructor Detail

### PdfLayerMembership

    public PdfLayerMembership(PdfWriter writer)

  Creates a new, empty, membership layer.

  Parameters:
    `writer` - the writer

Method Detail

### getRef

    public PdfIndirectReference getRef()

  Gets the `PdfIndirectReference` that represents this membership layer.

  Specified by:
    `getRef` in interface `PdfOCG`
  Returns:
    the `PdfIndirectReference` that represents this layer

### addMember

    public void addMember(PdfLayer layer)

  Adds a new member to the layer.

  Parameters:
    `layer` - the new member to the layer

### getLayers

    public java.util.Collection getLayers()

  Gets the member layers.

  Returns:
    the member layers

### setVisibilityPolicy

    public void setVisibilityPolicy(PdfName type)

  Sets the visibility policy for content belonging to this membership dictionary. Possible values are ALLON, ANYON, ANYOFF and ALLOFF. The default value is ANYON.

  Parameters:
    `type` - the visibility policy

### getPdfObject

    public PdfObject getPdfObject()

  Gets the dictionary representing the membership layer. It just returns `this`.

  Specified by:
    `getPdfObject` in interface `PdfOCG`
  Returns:
    the dictionary representing the layer

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