BrowseDAO (DSpace Kernel :: API and Implementation 6.1 API)

All Known Implementing Classes:

SolrBrowseDAO
```
public interface BrowseDAO
```
Interface for any class wishing to interact with the Browse storage layer for Read Only operations. If you wish to modify the contents of the browse indices or create and destroy index tables you should look at implementations for BrowseCreateDAO. If you implement this class, and you wish it to be loaded via the BrowseDAOFactory you must supply a constructor of the form: public BrowseDAOImpl(Context context) {} Where Context is the DSpace Context object Where tables are referred to in this class, they can be obtained from the BrowseIndex class, which will answer queries given the context of the request on which table is the relevant target.

Author:

Richard Jones

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and Description
`int`	`doCountQuery()` This executes a query which will count the number of results for the parameters you set.
`int`	`doDistinctOffsetQuery(String column, String value, boolean isAscending)` This executes a query which returns the offset where the value (or nearest greater equivalent) can be found in the specified table ordered by the column.
`String`	`doMaxQuery(String column, String table, int itemID)` This executes a query which returns the value of the "highest" (max) value in the given table's column for the given item id.
`int`	`doOffsetQuery(String column, String value, boolean isAscending)` This executes a query which returns the offset where the value (or nearest greater equivalent) can be found in the specified table ordered by the column.
`List<Item>`	`doQuery()` This executes a query which returns a List object containing BrowseItem objects representing the results of a full item browse.
`List<String[]>`	`doValueQuery()` This executes a query which returns a List object containing String values which represent the results of a single value browse (for example, the list of all subject headings).
`String`	`getAuthorityValue()`
`UUID`	`getContainerID()` Get the database ID of the container object.
`String`	`getContainerIDField()` get the name of the field in which to look for the container id.
`String`	`getContainerTable()` Get the name of the container table that is being used to map items to distinct values when in a container constrained browse
`String[]`	`getCountValues()` Get the array of fields that we will be counting on.
`String`	`getFilterValue()` Get the value which we are constraining all our browse results to contain.
`String`	`getFilterValueField()` Get the name of the field in which the value to constrain results is contained
`String`	`getJumpToField()` Get the field in which we will match a focus value from which to start the browse.
`String`	`getJumpToValue()` Get the value at which the browse will start.
`int`	`getLimit()` get the integer number which is the limit of the results that will be returned by any query.
`int`	`getOffset()` Get the offset from the first result from which to return results.
`String`	`getOrderField()` Get the database field which will be used to do the sorting of result sets on.
`String[]`	`getSelectValues()` Get the array of values that we will be selecting on.
`String`	`getTable()` get the name of the table that we are querying
`boolean`	`isAscending()` Is the sort order ascending or descending? Default value is true
`boolean`	`isDistinct()` Is this a distinct value browse?
`boolean`	`isEnableBrowseFrequencies()`
`void`	`setAscending(boolean ascending)` Set whether the results should be sorted in ascending order (on the given sort column) or descending order.
`void`	`setAuthorityValue(String value)`
`void`	`setContainerID(UUID containerID)` Set the database id of the container object.
`void`	`setContainerIDField(String containerIDField)` set the name of the field in which to look for the container id.
`void`	`setContainerTable(String containerTable)` If we have specified a container id and container field, we must also specify a container table.
`void`	`setCountValues(String[] fields)` Set the array of columns that we will be counting over.
`void`	`setDistinct(boolean bool)` Set whether this is a distinct value browse or not
`void`	`setEnableBrowseFrequencies(boolean enableBrowseFrequencies)`
`void`	`setEqualsComparator(boolean equalsComparator)` Set whether the query should use an equals comparator when doing less than or greater than comparisons.
`void`	`setFilterMappingTables(String tableDis, String tableMap)` Set the name of the mapping tables to use for filtering
`void`	`setFilterValue(String value)` Set the value to which all our browse results should be constrained.
`void`	`setFilterValueField(String valueField)` Set he name of the field in which the value to constrain results is contained
`void`	`setFilterValuePartial(boolean part)` Sets whether we will treat the filter value as partial (like match), or exact
`void`	`setJumpToField(String focusField)` Set the focus field upon which we will match a value from which to start the browse.
`void`	`setJumpToValue(String focusValue)` Set the value upon which to start the browse from.
`void`	`setLimit(int limit)` Set the limit for how many results should be returned.
`void`	`setOffset(int offset)` Get the offset from the first result from which to return results.
`void`	`setOrderField(String orderField)` Set the database field which will be used to sort result sets on
`void`	`setSelectValues(String[] selectValues)` Set the array of values to select on.
`void`	`setTable(String table)` Set the name of the table to query
`boolean`	`useEqualsComparator()` Does the query use the equals comparator when doing less than or greater than comparisons.

- Method Detail
  - doCountQuery
```
int doCountQuery()
          throws BrowseException
```
    This executes a query which will count the number of results for the parameters you set.
    
    Returns:
    
    the integer value of the number of results found
    
    Throws:
    
    BrowseException - if browse error
  - doValueQuery
```
List<String[]> doValueQuery()
                     throws BrowseException
```
    This executes a query which returns a List object containing String values which represent the results of a single value browse (for example, the list of all subject headings). This is most commonly used with a Distinct browse type.
    
    Returns:
    
    List of Strings representing the single value query results
    
    Throws:
    
    BrowseException - if browse error
  - doQuery
```
List<Item> doQuery()
            throws BrowseException
```
    This executes a query which returns a List object containing BrowseItem objects representing the results of a full item browse.
    
    Returns:
    
    List of BrowseItem objects
    
    Throws:
    
    BrowseException - if browse error
  - doMaxQuery
```
String doMaxQuery(String column,
                  String table,
                  int itemID)
           throws BrowseException
```
    This executes a query which returns the value of the "highest" (max) value in the given table's column for the given item id.
    
    Parameters:
    
    column - the column to interrogate
    
    table - the table to query
    
    itemID - the item id
    
    Returns:
    
    String representing the max value in the given column
    
    Throws:
    
    BrowseException - if browse error
  - doOffsetQuery
```
int doOffsetQuery(String column,
                  String value,
                  boolean isAscending)
           throws BrowseException
```
    This executes a query which returns the offset where the value (or nearest greater equivalent) can be found in the specified table ordered by the column.
    
    Parameters:
    
    column - the column to interrogate
    
    value - the item id
    
    isAscending - browsing in ascending or descending order
    
    Returns:
    
    the offset into the table
    
    Throws:
    
    BrowseException - if browse error
  - doDistinctOffsetQuery
```
int doDistinctOffsetQuery(String column,
                          String value,
                          boolean isAscending)
                   throws BrowseException
```
    This executes a query which returns the offset where the value (or nearest greater equivalent) can be found in the specified table ordered by the column.
    
    Parameters:
    
    column - the column to interrogate
    
    value - the item id
    
    isAscending - browsing in ascending or descending order
    
    Returns:
    
    the offset into the table
    
    Throws:
    
    BrowseException - if browse error
  - useEqualsComparator
```
boolean useEqualsComparator()
```
    Does the query use the equals comparator when doing less than or greater than comparisons. @see setEqualsComparator Default value is true
    
    Returns:
    
    true if using it, false if not
  - setEqualsComparator
```
void setEqualsComparator(boolean equalsComparator)
```
    Set whether the query should use an equals comparator when doing less than or greater than comparisons. That is, if true then comparisons will be made using the equivalent of <= and >=, while if false it will use the equivalent of < and >
    
    Parameters:
    
    equalsComparator - true to use, false to not.
  - isAscending
```
boolean isAscending()
```
    Is the sort order ascending or descending? Default value is true
    
    Returns:
    
    true for ascending, false for descending
  - setAscending
```
void setAscending(boolean ascending)
```
    Set whether the results should be sorted in ascending order (on the given sort column) or descending order.
    
    Parameters:
    
    ascending - true to ascend, false to descend
  - getContainerID
```
UUID getContainerID()
```
    Get the database ID of the container object. The container object will be a Community or a Collection.
    
    Returns:
    
    the database id of the container, or -1 if none is set
  - setContainerID
```
void setContainerID(UUID containerID)
```
    Set the database id of the container object. This should be the id of a Community or Collection. This will constrain the results of the browse to only items or values within items that appear in the given container.
    
    Parameters:
    
    containerID -
  - getContainerIDField
```
String getContainerIDField()
```
    get the name of the field in which to look for the container id. This is principally for use internal to the DAO.
    
    Returns:
    
    the name of the container id field. For example "collection_id" or "community_id"
  - setContainerIDField
```
void setContainerIDField(String containerIDField)
```
    set the name of the field in which to look for the container id.
    
    Parameters:
    
    containerIDField - the name of the container id field. For example "collection_id" or "community_id"
  - getJumpToField
```
String getJumpToField()
```
    Get the field in which we will match a focus value from which to start the browse. This will either be the "sort_value" field or one of the additional sort fields defined by configuration
    
    Returns:
    
    the name of the focus field
  - setJumpToField
```
void setJumpToField(String focusField)
```
    Set the focus field upon which we will match a value from which to start the browse. This will either be the "sort_value" field or one of the additional sort fields defined by configuration
    
    Parameters:
    
    focusField - the name of the focus field
  - getJumpToValue
```
String getJumpToValue()
```
    Get the value at which the browse will start. The value supplied here will be the top result on the page of results.
    
    Returns:
    
    the value to start browsing on
  - setJumpToValue
```
void setJumpToValue(String focusValue)
```
    Set the value upon which to start the browse from. The value supplied here will be the top result on the page of results
    
    Parameters:
    
    focusValue - the value in the focus field on which to start browsing
  - getLimit
```
int getLimit()
```
    get the integer number which is the limit of the results that will be returned by any query. The default is -1, which means unlimited results.
    
    Returns:
    
    the maximum possible number of results allowed to be returned
  - setLimit
```
void setLimit(int limit)
```
    Set the limit for how many results should be returned. This is generally for use in paging or limiting the number of items be be displayed. The default is -1, meaning unlimited results. Note that if the number of results of the query is less than this number, the size of the result set will be smaller than this limit.
    
    Parameters:
    
    limit - the maximum number of results to return.
  - getOffset
```
int getOffset()
```
    Get the offset from the first result from which to return results. This functionality is present for backwards compatibility, but is ill advised. All normal browse operations can be completed without it. The default is -1, which means do not offset.
    
    Returns:
    
    the offset
  - setOffset
```
void setOffset(int offset)
```
    Get the offset from the first result from which to return results. This functionality is present for backwards compatibility, but is ill advised. All normal browse operations can be completed without it. The default is -1, which means do not offset.
    
    Parameters:
    
    offset -
  - getOrderField
```
String getOrderField()
```
    Get the database field which will be used to do the sorting of result sets on.
    
    Returns:
    
    the field by which results will be sorted
  - setOrderField
```
void setOrderField(String orderField)
```
    Set the database field which will be used to sort result sets on
    
    Parameters:
    
    orderField - the field by which results will be sorted
  - getSelectValues
```
String[] getSelectValues()
```
    Get the array of values that we will be selecting on. The default is to select all of the values from a given table
    
    Returns:
    
    an array of values to select on
  - setSelectValues
```
void setSelectValues(String[] selectValues)
```
    Set the array of values to select on. This should be a list of the columns available in the target table, or the SQL wildcards. The default is single element array with the standard wildcard (*)
    
    Parameters:
    
    selectValues - the values to select on
  - getCountValues
```
String[] getCountValues()
```
    Get the array of fields that we will be counting on.
    
    Returns:
    
    an array of fields to be counted over
  - setCountValues
```
void setCountValues(String[] fields)
```
    Set the array of columns that we will be counting over. In general, the wildcard (*) will suffice
    
    Parameters:
    
    fields - an array of fields to be counted over
  - getTable
```
String getTable()
```
    get the name of the table that we are querying
    
    Returns:
    
    the name of the table
  - setTable
```
void setTable(String table)
```
    Set the name of the table to query
    
    Parameters:
    
    table - the name of the table
  - setFilterMappingTables
```
void setFilterMappingTables(String tableDis,
                            String tableMap)
```
    Set the name of the mapping tables to use for filtering
    
    Parameters:
    
    tableDis - the name of the table holding the distinct values
    
    tableMap - the name of the table holding the mappings
  - getFilterValue
```
String getFilterValue()
```
    Get the value which we are constraining all our browse results to contain.
    
    Returns:
    
    the value to which to constrain results
  - setFilterValue
```
void setFilterValue(String value)
```
    Set the value to which all our browse results should be constrained. For example, if you are listing all of the publications by a single author your value would be the author name.
    
    Parameters:
    
    value - the value to which to constrain results
  - setFilterValuePartial
```
void setFilterValuePartial(boolean part)
```
    Sets whether we will treat the filter value as partial (like match), or exact
    
    Parameters:
    
    part - true if partial, false if exact
  - getFilterValueField
```
String getFilterValueField()
```
    Get the name of the field in which the value to constrain results is contained
    
    Returns:
    
    the name of the field
  - setFilterValueField
```
void setFilterValueField(String valueField)
```
    Set he name of the field in which the value to constrain results is contained
    
    Parameters:
    
    valueField - the name of the field
  - setDistinct
```
void setDistinct(boolean bool)
```
    Set whether this is a distinct value browse or not
    
    Parameters:
    
    bool - true if distinct value, false if not
  - isDistinct
```
boolean isDistinct()
```
    Is this a distinct value browse?
    
    Returns:
    
    true if distinct, false if not
  - setContainerTable
```
void setContainerTable(String containerTable)
```
    If we have specified a container id and container field, we must also specify a container table. This is the name of the table that maps the item onto the distinct value. Since we are in a container, this value will actually be the view which allows us to select only items which are within a given container
    
    Parameters:
    
    containerTable - the name of the container table mapping
  - getContainerTable
```
String getContainerTable()
```
    Get the name of the container table that is being used to map items to distinct values when in a container constrained browse
    
    Returns:
    
    the name of the table
  - setAuthorityValue
```
void setAuthorityValue(String value)
```
  - getAuthorityValue
```
String getAuthorityValue()
```
  - isEnableBrowseFrequencies
```
boolean isEnableBrowseFrequencies()
```
  - setEnableBrowseFrequencies
```
void setEnableBrowseFrequencies(boolean enableBrowseFrequencies)
```

Interface BrowseDAO

Method Summary

Method Detail

doCountQuery

doValueQuery

doQuery

doMaxQuery

doOffsetQuery

doDistinctOffsetQuery

useEqualsComparator

setEqualsComparator

isAscending

setAscending

getContainerID

setContainerID

getContainerIDField

setContainerIDField

getJumpToField

setJumpToField

getJumpToValue

setJumpToValue

getLimit

setLimit

getOffset

setOffset

getOrderField

setOrderField

getSelectValues

setSelectValues

getCountValues

setCountValues

getTable

setTable

setFilterMappingTables

getFilterValue

setFilterValue

setFilterValuePartial

getFilterValueField

setFilterValueField

setDistinct

isDistinct

setContainerTable

getContainerTable

setAuthorityValue

getAuthorityValue

isEnableBrowseFrequencies

setEnableBrowseFrequencies