Class CompoundDS
- All Implemented Interfaces:
Serializable
,DataFormat
A compound datatype is an aggregation of one or more datatypes. Each member of a compound type has a name which is unique within that type, and a datatype of that member in a compound datum. Compound datatype can be nested, i.e. members of compound datatype can be some other compound datatype.
For more details on compound datatype, see {@link <a href="http://hdfgroup.org/HDF5/doc/UG/index.html">HDF5 User's Guide}
Since Java cannot handle C-structured compound data, data in compound dataset is loaded in to an Java List. Each element of the list is a data array that corresponds to a compound field. The data is read/written by compound field.
For example, if compound dataset "comp" has the following nested structure, and memeber datatypes
comp --> m01 (int) comp --> m02 (float) comp --> nest1 --> m11 (char) comp --> nest1 --> m12 (String) comp --> nest1 --> nest2 --> m21 (long) comp --> nest1 --> nest2 --> m22 (double)The data object is an Java list of six arrays: {int[], float[], char[], Stirng[], long[] and double[]}.
- Version:
- 1.1 9/4/2007
- Author:
- Peter X. Cao
- See Also:
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Field Summary
FieldsModifier and TypeFieldDescriptionprotected boolean[]
The array to store flags to indicate if a member of compound dataset is selected for read/write.protected Object[]
The dimension sizes of each member.protected String[]
The names of members of the compound dataset.protected int[]
Returns array containing the total number of elements of the members of compound.protected Datatype[]
The datatypes of compound members.protected int
The number of members of the compound dataset.static final String
A single character to separate the names of nested compound fields.Fields inherited from class ncsa.hdf.object.Dataset
chunkSize, compression, compression_gzip_txt, convertByteToString, convertedBuf, data, datatype, dimNames, dims, enumConverted, filters, isDataLoaded, maxDims, nPoints, originalBuf, rank, selectedDims, selectedIndex, selectedStride, startDims, storage
Fields inherited from class ncsa.hdf.object.HObject
fileFormat, linkTargetObjName, oid
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Constructor Summary
ConstructorsConstructorDescriptionCompoundDS
(FileFormat theFile, String name, String path) Constructs a CompoundDS object with given file, dataset name and path.CompoundDS
(FileFormat theFile, String name, String path, long[] oid) Deprecated. -
Method Summary
Modifier and TypeMethodDescriptionDeprecated.Not implemented for compound dataset.final int
Returns the number of members of the compound dataset.final int[]
getMemberDims
(int i) Returns the dimension sizes of of the i-th member.final String[]
Returns the names of the members of the compound dataset.final int[]
Returns array containing the total number of elements of the members of compound.final Datatype[]
Returns an array of datatype objects of compound members.final int
Returns the number of selected members of the compound dataset.final int[]
Returns array containing the total number of elements of the elected members of compound.final Datatype[]
Returns an array of datatype objects of selected compound members.final boolean
isMemberSelected
(int idx) Checks if a member of compound is selected for read/write.final void
selectMember
(int idx) Selects the i-th member for read/write.final void
setMemberSelection
(boolean isSelected) Selects/deselects all members.Methods inherited from class ncsa.hdf.object.Dataset
byteToString, clear, clearData, convertFromUnsignedC, convertFromUnsignedC, convertToUnsignedC, convertToUnsignedC, getChunkSize, getCompression, getConvertByteToString, getData, getDatatype, getDimNames, getDims, getFilters, getHeight, getMaxDims, getOriginalClass, getRank, getSelectedDims, getSelectedIndex, getSize, getStartDims, getStorage, getStride, getWidth, init, isEnumConverted, isString, read, readBytes, setConvertByteToString, setData, setEnumConverted, stringToByte, write, write
Methods inherited from class ncsa.hdf.object.HObject
close, debug, equalsOID, getFID, getFile, getFileFormat, getFullName, getLinkTargetObjName, getName, getOID, getPath, open, setLinkTargetObjName, setName, setPath, toString
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
Methods inherited from interface ncsa.hdf.object.DataFormat
getMetadata, hasAttribute, removeMetadata, updateMetadata, writeMetadata
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Field Details
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separator
A single character to separate the names of nested compound fields. An extended ASCII character, 0x95, is used to avoid common characters in compound names.- See Also:
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numberOfMembers
protected int numberOfMembersThe number of members of the compound dataset. -
memberNames
The names of members of the compound dataset. -
memberOrders
protected int[] memberOrdersReturns array containing the total number of elements of the members of compound.For example, a compound dataset COMP has members of A, B and C as
COMP { int A; float B[5]; double C[2][3]; }
memberOrders is an integer array of {1, 5, 6} to indicate that member A has one element, member B has 5 elements, and member C has 6 elements. -
memberDims
The dimension sizes of each member.The i-th element of the Object[] is an integer array (int[]) that contains the dimension sizes of the i-th member.
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memberTypes
The datatypes of compound members. -
isMemberSelected
protected boolean[] isMemberSelectedThe array to store flags to indicate if a member of compound dataset is selected for read/write.If a member is selected, the read/write will perform on the member. Applications such as HDFView will only display the selected members of the compound dataset.
For example, if a compound dataset has four members String[] memberNames = {"X", "Y", "Z", "TIME"}; and boolean[] isMemberSelected = {true, false, false, true}; members "X" and "TIME" are selected for read and write.
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Constructor Details
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CompoundDS
Constructs a CompoundDS object with given file, dataset name and path.The dataset object represents an existing dataset in the file. For example, new H5CompoundDS(file, "dset1", "/g0/") constructs a dataset object that corresponds to the dataset,"dset1", at group "/g0/".
This object is usually constructed at FileFormat.open(), which loads the file structure and object informatoin into tree structure (TreeNode). It is rarely used elsewhere.
- Parameters:
theFile
- the file that contains the dataset.name
- the name of the CompoundDS, e.g. "compDS".path
- the path of the CompoundDS, e.g. "/g1".
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CompoundDS
Deprecated.Not for public use in the future.
UsingCompoundDS(FileFormat, String, String)
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Method Details
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getMemberCount
public final int getMemberCount()Returns the number of members of the compound dataset.- Returns:
- the number of members of the compound dataset.
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getSelectedMemberCount
public final int getSelectedMemberCount()Returns the number of selected members of the compound dataset. Selected members are the compound fields which are selected for read/write.For example, in a compound datatype of {int A, float B, char[] C}, users can choose to retrieve only {A, C} from dataset. In this case, getSelectedMemberCount() returns two.
- Returns:
- the number of selected members.
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getMemberNames
Returns the names of the members of the compound dataset. The names of compound members are stored in an array of Strings.For example, for a compound datatype of {int A, float B, char[] C} getMemberNames() returns ["A", "B", "C"}.
- Returns:
- the names of compound members.
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isMemberSelected
public final boolean isMemberSelected(int idx) Checks if a member of compound is selected for read/write.- Parameters:
idx
- the index of compound member.- Returns:
- true if the i-th memeber is selected; otherwise returns false.
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selectMember
public final void selectMember(int idx) Selects the i-th member for read/write.- Parameters:
idx
- the index of compound member.
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setMemberSelection
public final void setMemberSelection(boolean isSelected) Selects/deselects all members.- Parameters:
isSelected
- The indicator to select or deselect all members. If true, all members are selected for read/write. If false, no member is selected for read/write.
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getMemberOrders
public final int[] getMemberOrders()Returns array containing the total number of elements of the members of compound.For example, a compound dataset COMP has members of A, B and C as
COMP { int A; float B[5]; double C[2][3]; }
getMemberOrders() will return an integer array of {1, 5, 6} to indicate that member A has one element, member B has 5 elements, and member C has 6 elements.- Returns:
- the array containing the total number of elements of the members of compound.
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getSelectedMemberOrders
public final int[] getSelectedMemberOrders()Returns array containing the total number of elements of the elected members of compound.For example, a compound dataset COMP has members of A, B and C as
COMP { int A; float B[5]; double C[2][3]; }
If A and B are selected, getSelectedMemberOrders() returns an array of {1, 5}- Returns:
- array containing the total number of elements of the selected members of compound.
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getMemberDims
public final int[] getMemberDims(int i) Returns the dimension sizes of of the i-th member.For example, a compound dataset COMP has members of A, B and C as
COMP { int A; float B[5]; double C[2][3]; }
getMemberDims(2) returns an array of {2, 3}, while getMemberDims(1) returns an array of {5}, getMemberDims(0) returns null.- Returns:
- the dimension sizes of of the i-th member, null if the compound member is not an array.
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getMemberTypes
Returns an array of datatype objects of compound members.Each member of a compound dataset has its own datatype. The datatype of a member can be atomic or other compound datatype (nested compound). Sub-classes set up the datatype objects at init().
- Returns:
- the array of datatype objects of the compound members.
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getSelectedMemberTypes
Returns an array of datatype objects of selected compound members.- Returns:
- an array of datatype objects of selected compound members.
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copy
@Deprecated public Dataset copy(Group pgroup, String name, long[] dims, Object data) throws Exception Deprecated.Not implemented for compound dataset.Description copied from class:Dataset
Creates a new dataset and writes the data buffer to the new dataset.This function allows applications to create a new dataset for a given data buffer. For example, users can select a specific interesting part from a large image and create a new image with the selection.
The new dataset retains the datatype and dataset creation properties of this dataset.
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Using
CompoundDS(FileFormat, String, String)