org.apache.torque.criteria

## Class Criterion

- java.lang.Object
- - org.apache.torque.criteria.Criterion

- All Implemented Interfaces:
    Serializable

      public class Criterion
      extends Object
      implements Serializable

  Describes one or more where clause parts in the Criteria. Either the parts list is not null and represents this criterion or the column, value, comparison and ignoreStringCase columns are not null and represent this criterion.
  See Also:
    Serialized Form

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static String` | `AND` Constant for the operator " AND ".
    `static String` | `OR` Constant for the operator " OR ".

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `Criterion(Criterion toCopy)` Creates a shallow copy of the given Criterion.
    `Criterion(Object lValue, Object rValue)` Create a new instance without verbatim sql, using equals as comparison operator.
    `Criterion(Object lValue, Object rValue, SqlEnum comparison)` Create a new instance without verbatim sql.
    `Criterion(Object lValue, Object rValue, SqlEnum comparison, String sql, Object[] preparedStatementReplacements)` Create a new instance.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `Criterion` | `and(Criterion criterion)` Replaces this criterion's condition with (this criterion's condition AND criterion).
    `void` | `appendTo(StringBuilder sb)` Appends a debug String representation of the Criterion onto the String builder.
    `boolean` | `equals(Object obj)`
    `SqlEnum` | `getComparison()` Get the comparison.
    `String` | `getConjunction()` Returns the conjunction for the parts of this criterion
    `Object` | `getLValue()` Get the left hand side value of the comparison.
    `List<Criterion>` | `getParts()` Returns the parts of which this criterion consists.
    `Object[]` | `getPreparedStatementReplacements()` Returns the prepared statement replacements for a verbatim sql condition.
    `Object` | `getRValue()` Get the right hand side value of the comparison.
    `String` | `getSql()` Returns the verbatim sql for this condition.
    `int` | `hashCode()`
    `boolean` | `isComposite()` Returns whether this criterion is a composite criterion.
    `boolean` | `isIgnoreCase()` Is ignore case on or off?
    `boolean` | `isVerbatimSqlCondition()` Returns whether this Criterion represents a verbatim sql condition.
    `Criterion` | `or(Criterion criterion)` Replaces this criterion's condition with (this criterion's condition OR criterion).
    `Criterion` | `setIgnoreCase(boolean b)` Sets ignore case.
    `void` | `setLValue(Object lValue)` Set the left hand side value of the comparison.
    `void` | `setRValue(Object rValue)` Set the right hand side value of the comparison.
    `String` | `toString()` Build a string representation of the Criterion for debug purposes.

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

      `clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

- - ### Field Detail

    - #### AND

          public static final String AND

      Constant for the operator " AND ".
      See Also:
        Constant Field Values

    - #### OR

          public static final String OR

      Constant for the operator " OR ".
      See Also:
        Constant Field Values

  - ### Constructor Detail

    - #### Criterion

          public Criterion(Object lValue,
                           Object rValue,
                           SqlEnum comparison,
                           String sql,
                           Object[] preparedStatementReplacements)

      Create a new instance. Either this Criterion represents a comparison without verbatim SQL; in this case the parameters lValue and comparison must be not null, rValue may be not null and sql and preparedStatementReplacements must be null; or it represents a verbatim sql condition, in which case the parameter comparison must be null and the sql must be not null (preparedStatementReplacements may be set to contain sql placeholder replacement values, and lValue and rValue can be set to add columns to the automatically computed from clause of the query).
      Parameters:
        `lValue` - the left hand side value of the comparison. If this value should be a value from the database, the object must implement the `org.apache.torque.Column` interface.
        `rValue` - the right hand side value of the comparison. If this value should be a value from the database, the object must implement the `org.apache.torque.Column` interface.
        `comparison` - The comparison operator. Either this parameter or sql must be not null.
        `sql` - a verbatim sql condition. Either this parameter or comparison must be not null.
        `preparedStatementReplacements` - Values for the placeholders in the verbatim sql condition.
      Throws:
        `NullPointerException` - if column is null.

    - #### Criterion

          public Criterion(Object lValue,
                           Object rValue)

      Create a new instance without verbatim sql, using equals as comparison operator.
      Parameters:
        `lValue` - the left hand side value of the comparison, not null. If this value should be a value from the database, the object must implement the `org.apache.torque.Column` interface.
        `rValue` - the right hand side value of the comparison. If this value should be a value from the database, the object must implement the `org.apache.torque.Column` interface.

    - #### Criterion

          public Criterion(Object lValue,
                           Object rValue,
                           SqlEnum comparison)

      Create a new instance without verbatim sql.
      Parameters:
        `lValue` - the left hand side value of the comparison, not null. If this value should be a value from the database, the object must implement the `org.apache.torque.Column` interface.
        `rValue` - the right hand side value of the comparison. If this value should be a value from the database, the object must implement the `org.apache.torque.Column` interface.
        `comparison` - The comparison operator, not null.

    - #### Criterion

          public Criterion(Criterion toCopy)

      Creates a shallow copy of the given Criterion.
      Parameters:
        `toCopy` - the Criterion to copy from, not null.

  - ### Method Detail

    - #### getLValue

          public Object getLValue()

      Get the left hand side value of the comparison.
      Returns:
        the left hand side value of the comparison. If this value is a value computed by the database, the object implements the `org.apache.torque.Column` interface.

    - #### setLValue

          public void setLValue(Object lValue)

      Set the left hand side value of the comparison.
      Parameters:
        `lValue` - the left hand side value of the comparison. If this value is a value computed by the database, the object must implement the `org.apache.torque.Column` interface.

    - #### getComparison

          public SqlEnum getComparison()

      Get the comparison.
      Returns:
        A String with the comparison, or null if this Criterion represents a verbatim sql condition.

    - #### getRValue

          public Object getRValue()

      Get the right hand side value of the comparison.
      Returns:
        the right hand side value of the comparison. If this value is a value computed by the database, the object implements the `org.apache.torque.Column` interface.

    - #### setRValue

          public void setRValue(Object rValue)

      Set the right hand side value of the comparison.
      Parameters:
        `rValue` - the right hand side value of the comparison. If this value is a value computed by the database, the object must implement the `org.apache.torque.Column` interface.

    - #### getSql

          public String getSql()

      Returns the verbatim sql for this condition.
      Returns:
        the verbatim sql for this condition, or null if this Criterion does not represent a verbatim sql condition.

    - #### getPreparedStatementReplacements

          public Object[] getPreparedStatementReplacements()

      Returns the prepared statement replacements for a verbatim sql condition.
      Returns:
        the replacement values, or null.

    - #### isVerbatimSqlCondition

          public boolean isVerbatimSqlCondition()

      Returns whether this Criterion represents a verbatim sql condition.
      Returns:
        true if this Criterion represents a verbatim sql condition, false if the sql is computed from lValue, comparison and rValue.

    - #### setIgnoreCase

          public Criterion setIgnoreCase(boolean b)

      Sets ignore case. ignoreCase is ignored for a verbatim sql statement.
      Parameters:
        `b` - True if case should be ignored.
      Returns:
        A modified Criterion object.

    - #### isIgnoreCase

          public boolean isIgnoreCase()

      Is ignore case on or off?
      Returns:
        True if case is ignored.

    - #### getParts

          public List<Criterion> getParts()

      Returns the parts of which this criterion consists.
      Returns:
        an unmodifiable list of the clauses, or null if this criterion is not a composite criterion.

    - #### getConjunction

          public String getConjunction()

      Returns the conjunction for the parts of this criterion
      Returns:
        the conjunction, or null if this criterion is not a composite criterion.

    - #### isComposite

          public boolean isComposite()

      Returns whether this criterion is a composite criterion.
      Returns:
        true if this criterion is a composite criterion, false if it represents a single condition.

    - #### and

          public Criterion and(Criterion criterion)

      Replaces this criterion's condition with (this criterion's condition AND criterion).
      Parameters:
        `criterion` - the criterion to and with this criterion, not null.
      Returns:
        the modified Criteria object.

    - #### or

          public Criterion or(Criterion criterion)

      Replaces this criterion's condition with (this criterion's condition OR criterion).
      Parameters:
        `criterion` - the criterion to and with this criterion, not null.
      Returns:
        the modified Criteria object.

    - #### appendTo

          public void appendTo(StringBuilder sb)

      Appends a debug String representation of the Criterion onto the String builder.
      Parameters:
        `sb` - the string representation

    - #### toString

          public String toString()

      Build a string representation of the Criterion for debug purposes.
      Overrides:
        `toString` in class `Object`
      Returns:
        A String with the representation of the Criterion.

    - #### equals

          public boolean equals(Object obj)

      Overrides:
        `equals` in class `Object`

    - #### hashCode

          public int hashCode()

      Overrides:
        `hashCode` in class `Object`

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