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## org.apache.poi.openxml4j.opc
Class PackagePart

    java.lang.Object
      org.apache.poi.openxml4j.opc.PackagePart

All Implemented Interfaces:
  RelationshipSource

Direct Known Subclasses:
  DigitalCertificatePart, MemoryPackagePart, PackageDigitalSignature, PackagePropertiesPart, ZipPackagePart

    public abstract class PackagePart

extends java.lang.Object
implements RelationshipSource

Provides a base class for parts stored in a Package.

Version:
  0.9
Author:
  Julien Chable

Constructor Summary
`PackagePart(OPCPackage pack, PackagePartName partName, java.lang.String contentType)` Constructor.

Method Summary
`PackageRelationship` | `addExternalRelationship(java.lang.String target, java.lang.String relationshipType)` Adds an external relationship to a part (except relationships part).
`PackageRelationship` | `addExternalRelationship(java.lang.String target, java.lang.String relationshipType, java.lang.String id)` Adds an external relationship to a part (except relationships part).
`PackageRelationship` | `addRelationship(PackagePartName targetPartName, TargetMode targetMode, java.lang.String relationshipType)` Add a relationship to a part (except relationships part).
`PackageRelationship` | `addRelationship(PackagePartName targetPartName, TargetMode targetMode, java.lang.String relationshipType, java.lang.String id)` Add a relationship to a part (except relationships part).
`PackageRelationship` | `addRelationship(java.net.URI targetURI, TargetMode targetMode, java.lang.String relationshipType)` Add a relationship to a part (except relationships part).
`PackageRelationship` | `addRelationship(java.net.URI targetURI, TargetMode targetMode, java.lang.String relationshipType, java.lang.String id)` Add a relationship to a part (except relationships part).
`void` | `clearRelationships()` Delete all the relationships attached to this.
`abstract void` | `close()` Close this part : flush this part, close the input stream and output stream.
`abstract void` | `flush()` Flush the content of this part.
`java.lang.String` | `getContentType()`
`java.io.InputStream` | `getInputStream()` Get the input stream of this part to read its content.
`java.io.OutputStream` | `getOutputStream()` Get the output stream of this part.
`OPCPackage` | `getPackage()`
`PackagePartName` | `getPartName()`
`PackageRelationship` | `getRelationship(java.lang.String id)` Retrieves a package relationship from its id.
`PackageRelationshipCollection` | `getRelationships()` Retrieve all the relationships attached to this part.
`PackageRelationshipCollection` | `getRelationshipsByType(java.lang.String relationshipType)` Retrieve all relationships attached to this part which have the specified type.
`boolean` | `hasRelationships()` Knows if the part have any relationships.
`boolean` | `isDeleted()`
`boolean` | `isRelationshipExists(PackageRelationship rel)` Checks if the specified relationship is part of this package part.
`boolean` | `isRelationshipPart()`
`abstract boolean` | `load(java.io.InputStream ios)` Load the content of this part.
`void` | `removeRelationship(java.lang.String id)` Delete the relationship specified by its id.
`abstract boolean` | `save(java.io.OutputStream zos)` Save the content of this part and the associated relationships part (if this part own at least one relationship) into the specified output stream.
`void` | `setContentType(java.lang.String contentType)` Set the content type.
`void` | `setDeleted(boolean isDeleted)`
`java.lang.String` | `toString()`

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

Constructor Detail

### PackagePart

    public PackagePart(OPCPackage pack,
                       PackagePartName partName,
                       java.lang.String contentType)
                throws InvalidFormatException

  Constructor.

  Parameters:
    `pack` - Parent package.
    `partName` - The part name, relative to the parent Package root.
    `contentType` - The Multipurpose Internet Mail Extensions (MIME) content type of the part's data stream.
  Throws:
    `InvalidFormatException`

Method Detail

### addExternalRelationship

    public PackageRelationship addExternalRelationship(java.lang.String target,
                                                       java.lang.String relationshipType)

  Adds an external relationship to a part (except relationships part). The targets of external relationships are not subject to the same validity checks that internal ones are, as the contents is potentially any file, URL or similar.

  Specified by:
    `addExternalRelationship` in interface `RelationshipSource`
  Parameters:
    `target` - External target of the relationship
    `relationshipType` - Type of relationship.
  Returns:
    The newly created and added relationship
  See Also:
    `RelationshipSource.addExternalRelationship(java.lang.String, java.lang.String)`

### addExternalRelationship

    public PackageRelationship addExternalRelationship(java.lang.String target,
                                                       java.lang.String relationshipType,
                                                       java.lang.String id)

  Adds an external relationship to a part (except relationships part). The targets of external relationships are not subject to the same validity checks that internal ones are, as the contents is potentially any file, URL or similar.

  Specified by:
    `addExternalRelationship` in interface `RelationshipSource`
  Parameters:
    `target` - External target of the relationship
    `relationshipType` - Type of relationship.
    `id` - Relationship unique id.
  Returns:
    The newly created and added relationship
  See Also:
    `RelationshipSource.addExternalRelationship(java.lang.String, java.lang.String)`

### addRelationship

    public PackageRelationship addRelationship(PackagePartName targetPartName,
                                               TargetMode targetMode,
                                               java.lang.String relationshipType)

  Add a relationship to a part (except relationships part).

  Specified by:
    `addRelationship` in interface `RelationshipSource`
  Parameters:
    `targetPartName` - Name of the target part. This one must be relative to the source root directory of the part.
    `targetMode` - Mode [Internal|External].
    `relationshipType` - Type of relationship.
  Returns:
    The newly created and added relationship
  See Also:
    `RelationshipSource.addRelationship(org.apache.poi.openxml4j.opc.PackagePartName, org.apache.poi.openxml4j.opc.TargetMode, java.lang.String)`

### addRelationship

    public PackageRelationship addRelationship(PackagePartName targetPartName,
                                               TargetMode targetMode,
                                               java.lang.String relationshipType,
                                               java.lang.String id)

  Add a relationship to a part (except relationships part).

  Check rule M1.25: The Relationships part shall not have relationships to any other part. Package implementers shall enforce this requirement upon the attempt to create such a relationship and shall treat any such relationship as invalid.

  Specified by:
    `addRelationship` in interface `RelationshipSource`
  Parameters:
    `targetPartName` - Name of the target part. This one must be relative to the source root directory of the part.
    `targetMode` - Mode [Internal|External].
    `relationshipType` - Type of relationship.
    `id` - Relationship unique id.
  Returns:
    The newly created and added relationship
  Throws:
    `InvalidFormatException` - If the URI point to a relationship part URI.
  See Also:
    `RelationshipSource.addRelationship(org.apache.poi.openxml4j.opc.PackagePartName, org.apache.poi.openxml4j.opc.TargetMode, java.lang.String, java.lang.String)`

### addRelationship

    public PackageRelationship addRelationship(java.net.URI targetURI,
                                               TargetMode targetMode,
                                               java.lang.String relationshipType)

  Add a relationship to a part (except relationships part).

  Parameters:
    `targetURI` - URI the target part. Must be relative to the source root directory of the part.
    `targetMode` - Mode [Internal|External].
    `relationshipType` - Type of relationship.
  Returns:
    The newly created and added relationship
  See Also:
    `RelationshipSource.addRelationship(org.apache.poi.openxml4j.opc.PackagePartName, org.apache.poi.openxml4j.opc.TargetMode, java.lang.String)`

### addRelationship

    public PackageRelationship addRelationship(java.net.URI targetURI,
                                               TargetMode targetMode,
                                               java.lang.String relationshipType,
                                               java.lang.String id)

  Add a relationship to a part (except relationships part).

  Check rule M1.25: The Relationships part shall not have relationships to any other part. Package implementers shall enforce this requirement upon the attempt to create such a relationship and shall treat any such relationship as invalid.

  Parameters:
    `targetURI` - URI of the target part. Must be relative to the source root directory of the part.
    `targetMode` - Mode [Internal|External].
    `relationshipType` - Type of relationship.
    `id` - Relationship unique id.
  Returns:
    The newly created and added relationship
  Throws:
    `InvalidFormatException` - If the URI point to a relationship part URI.
  See Also:
    `RelationshipSource.addRelationship(org.apache.poi.openxml4j.opc.PackagePartName, org.apache.poi.openxml4j.opc.TargetMode, java.lang.String, java.lang.String)`

### clearRelationships

    public void clearRelationships()

  Description copied from interface: `RelationshipSource`
  Delete all the relationships attached to this.

  Specified by:
    `clearRelationships` in interface `RelationshipSource`
  See Also:
    `RelationshipSource.clearRelationships()`

### removeRelationship

    public void removeRelationship(java.lang.String id)

  Delete the relationship specified by its id.

  Specified by:
    `removeRelationship` in interface `RelationshipSource`
  Parameters:
    `id` - The ID identified the part to delete.
  See Also:
    `RelationshipSource.removeRelationship(java.lang.String)`

### getRelationships

    public PackageRelationshipCollection getRelationships()
                                                   throws InvalidFormatException

  Retrieve all the relationships attached to this part.

  Specified by:
    `getRelationships` in interface `RelationshipSource`
  Returns:
    This part's relationships.
  Throws:
    `OpenXML4JException`
    `InvalidFormatException`
  See Also:
    `RelationshipSource.getRelationships()`

### getRelationship

    public PackageRelationship getRelationship(java.lang.String id)

  Retrieves a package relationship from its id.

  Specified by:
    `getRelationship` in interface `RelationshipSource`
  Parameters:
    `id` - ID of the package relationship to retrieve.
  Returns:
    The package relationship
  See Also:
    `RelationshipSource.getRelationship(java.lang.String)`

### getRelationshipsByType

    public PackageRelationshipCollection getRelationshipsByType(java.lang.String relationshipType)
                                                         throws InvalidFormatException

  Retrieve all relationships attached to this part which have the specified type.

  Specified by:
    `getRelationshipsByType` in interface `RelationshipSource`
  Parameters:
    `relationshipType` - Relationship type filter.
  Returns:
    All relationships from this part that have the specified type.
  Throws:
    `InvalidFormatException` - If an error occurs while parsing the part.
    `InvalidOperationException` - If the package is open in write only mode.
  See Also:
    `RelationshipSource.getRelationshipsByType(java.lang.String)`

### hasRelationships

    public boolean hasRelationships()

  Knows if the part have any relationships.

  Specified by:
    `hasRelationships` in interface `RelationshipSource`
  Returns:
    true if the part have at least one relationship else false.
  See Also:
    `RelationshipSource.hasRelationships()`

### isRelationshipExists

    public boolean isRelationshipExists(PackageRelationship rel)

  Checks if the specified relationship is part of this package part.

  Specified by:
    `isRelationshipExists` in interface `RelationshipSource`
  Parameters:
    `rel` - The relationship to check.
  Returns:
    true if the specified relationship exists in this part, else returns false
  See Also:
    `RelationshipSource.isRelationshipExists(org.apache.poi.openxml4j.opc.PackageRelationship)`

### getInputStream

    public java.io.InputStream getInputStream()
                                       throws java.io.IOException

  Get the input stream of this part to read its content.

  Returns:
    The input stream of the content of this part, else `null`.
  Throws:
    `java.io.IOException`

### getOutputStream

    public java.io.OutputStream getOutputStream()

  Get the output stream of this part. If the part is originally embedded in Zip package, it'll be transform intot a MemoryPackagePart in order to write inside (the standard Java API doesn't allow to write in the file)

  See Also:
    `MemoryPackagePart`

### getPartName

    public PackagePartName getPartName()

  Returns:
    the uri

### getContentType

    public java.lang.String getContentType()

  Returns:
    the contentType

### setContentType

    public void setContentType(java.lang.String contentType)
                        throws InvalidFormatException

  Set the content type.

  Parameters:
    `contentType` - the contentType to set
  Throws:
    `InvalidFormatException` - Throws if the content type is not valid.
    `InvalidOperationException` - Throws if you try to change the content type whereas this part is already attached to a package.

### getPackage

    public OPCPackage getPackage()

### isRelationshipPart

    public boolean isRelationshipPart()

  Returns:
    true if this part is a relationship

### isDeleted

    public boolean isDeleted()

  Returns:
    true if this part has been logically deleted

### setDeleted

    public void setDeleted(boolean isDeleted)

  Parameters:
    `isDeleted` - the isDeleted to set

### toString

    public java.lang.String toString()

  Overrides:
    `toString` in class `java.lang.Object`

### save

    public abstract boolean save(java.io.OutputStream zos)
                          throws OpenXML4JException

  Save the content of this part and the associated relationships part (if this part own at least one relationship) into the specified output stream.

  Parameters:
    `zos` - Output stream to save this part.
  Throws:
    `OpenXML4JException` - If any exception occur.

### load

    public abstract boolean load(java.io.InputStream ios)
                          throws InvalidFormatException

  Load the content of this part.

  Parameters:
    `ios` - The input stream of the content to load.
  Returns:
    true if the content has been successfully loaded, else false.
  Throws:
    `InvalidFormatException` - Throws if the content format is invalid.

### close

    public abstract void close()

  Close this part : flush this part, close the input stream and output stream. After this method call, the part must be available for packaging.

### flush

    public abstract void flush()

  Flush the content of this part. If the input stream and/or output stream as in a waiting state to read or write, the must to empty their respective buffer.

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