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## org.eclipse.birt.report.model.api.validators
Class DataColumnNameValidator

    java.lang.Object
      org.eclipse.birt.report.model.validators.AbstractSemanticValidator
          org.eclipse.birt.report.model.validators.AbstractElementValidator
              org.eclipse.birt.report.model.api.validators.DataColumnNameValidator

    public class DataColumnNameValidator

extends org.eclipse.birt.report.model.validators.AbstractElementValidator

Validates the result set column of the data item.

### Rule

The rule is that

- If data item has a column name and this column name has no corresponding column binding, semantic error is logged.

### Applicability

This validator is only applied to `DataItem`.

Field Summary

Fields inherited from class org.eclipse.birt.report.model.validators.AbstractSemanticValidator
`modules, name`

Method Summary
`static ComputedColumn` | `getColumn(java.util.List columns, java.lang.String name)` Gets the column with the given expression bound the given list.
`static DataColumnNameValidator` | `getInstance()` Returns the singleton validator instance.
`java.util.List` | `validate(org.eclipse.birt.report.model.core.Module module, org.eclipse.birt.report.model.core.DesignElement element)` Validates whether the page size is invalid.

Methods inherited from class org.eclipse.birt.report.model.validators.AbstractSemanticValidator
`canApplyToDesign, canApplyToLibrary, getName, isTemplateParameterDefinition, setModules, setName`

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

Method Detail

### getInstance

    public static DataColumnNameValidator getInstance()

  Returns the singleton validator instance.

  Returns:
    the validator instance

### validate

    public java.util.List validate(org.eclipse.birt.report.model.core.Module module,
                                   org.eclipse.birt.report.model.core.DesignElement element)

  Validates whether the page size is invalid.

  Specified by:
    `validate` in class `org.eclipse.birt.report.model.validators.AbstractElementValidator`
  Parameters:
    `module` - the module
    `element` - the master page to validate
  Returns:
    error list, each of which is the instance of `SemanticException`.

### getColumn

    public static ComputedColumn getColumn(java.util.List columns,
                                           java.lang.String name)

  Gets the column with the given expression bound the given list.

  Parameters:
    `columns` - the binding columns
    `name` - the column binding name
  Returns:
    the bound column

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