java.lang.Object
- liquibase.AbstractExtensibleObject
- - liquibase.plugin.AbstractPlugin
  - - liquibase.change.AbstractChange

All Implemented Interfaces:

Cloneable, Change, ExtensibleObject, Plugin, LiquibaseSerializable

Direct Known Subclasses:

AbstractModifyDataChange, AbstractSQLChange, AbstractTableChange, AddAutoIncrementChange, AddColumnChange, AddDefaultValueChange, AddForeignKeyConstraintChange, AddLookupTableChange, AddNotNullConstraintChange, AddPrimaryKeyChange, AddUniqueConstraintChange, AlterSequenceChange, CreateIndexChange, CreateProcedureChange, CreateSequenceChange, CreateTableChange, CreateViewChange, CustomChangeWrapper, DropAllForeignKeyConstraintsChange, DropColumnChange, DropDefaultValueChange, DropForeignKeyConstraintChange, DropIndexChange, DropNotNullConstraintChange, DropPrimaryKeyChange, DropProcedureChange, DropSequenceChange, DropTableChange, DropUniqueConstraintChange, DropViewChange, EmptyChange, ExecuteShellCommandChange, InsertDataChange, MergeColumnChange, ModifyDataTypeChange, OutputChange, RenameColumnChange, RenameSequenceChange, RenameTableChange, RenameViewChange, SetColumnRemarksChange, SetTableRemarksChange, StopChange, TagDatabaseChange
```
public abstract class AbstractChange
extends AbstractPlugin
implements Change
```
Standard superclass to simplify Change implementations. You can implement Change directly, this class is purely for convenience but recommended.
By default, this base class relies on annotations such as DatabaseChange and DatabaseChangeProperty and delegating logic to the SqlGenerator objects created to do the actual change work. Place the @DatabaseChangeProperty annotations on the read "get" methods to control property metadata.

Nested Class Summary
- Nested classes/interfaces inherited from interface liquibase.serializer.LiquibaseSerializable
  LiquibaseSerializable.SerializationType

Field Summary

Fields
Modifier and Type Field Description

protected static String NODENAME_COLUMN
- Fields inherited from interface liquibase.change.Change
  EMPTY_CHANGE, SHOULD_EXECUTE
- Fields inherited from interface liquibase.serializer.LiquibaseSerializable
  GENERIC_CHANGELOG_EXTENSION_NAMESPACE, GENERIC_SNAPSHOT_EXTENSION_NAMESPACE, STANDARD_CHANGELOG_NAMESPACE, STANDARD_SNAPSHOT_NAMESPACE
- Fields inherited from interface liquibase.plugin.Plugin
  PRIORITY_DATABASE, PRIORITY_DEFAULT, PRIORITY_NOT_APPLICABLE, PRIORITY_SPECIALIZED

Constructor Summary

Constructors
Constructor Description

AbstractChange()

Method Summary

All Methods Instance Methods Concrete Methods Deprecated Methods
Modifier and Type	Method	Description
`ChangeStatus`	`checkStatus(Database database)`	Validate that this change executed successfully against the given database.
`protected String[]`	`createAlternateParameterNames(DatabaseChangeProperty changePropertyAnnotation)`
`ChangeMetaData`	`createChangeMetaData()`	Generate the ChangeMetaData for this class.
`protected ChangeParameterMetaData`	`createChangeParameterMetadata(String parameterName)`	Called by `createChangeMetaData()` to create metadata for a given parameter.
`protected String`	`createDescriptionMetaData(String parameterName, DatabaseChangeProperty changePropertyAnnotation)`	Create the `ChangeParameterMetaData` "description" value.
`protected ColumnConfig`	`createEmptyColumnConfig(Class collectionType)`
`protected Map<String,Object>`	`createExampleValueMetaData(String parameterName, DatabaseChangeProperty changePropertyAnnotation)`	Create the `ChangeParameterMetaData` "example" value.
`protected Change[]`	`createInverses()`	Create inverse changes that can roll back this change.
`protected String`	`createMustEqualExistingMetaData(String parameterName, DatabaseChangeProperty changePropertyAnnotation)`	Create the `ChangeParameterMetaData` "mustEqual" value.
`protected String[]`	`createRequiredDatabasesMetaData(String parameterName, DatabaseChangeProperty changePropertyAnnotation)`	Create the `ChangeParameterMetaData` "requiredDatabases" value.
`protected LiquibaseSerializable.SerializationType`	`createSerializationTypeMetaData(String parameterName, DatabaseChangeProperty changePropertyAnnotation)`	Create the `ChangeParameterMetaData` "serializationType" value.
`protected String`	`createSinceMetaData(String parameterName, DatabaseChangeProperty changePropertyAnnotation)`	Create the `ChangeParameterMetaData` "since" value.
`protected String[]`	`createSupportedDatabasesMetaData(String parameterName, DatabaseChangeProperty changePropertyAnnotation)`	Create the `ChangeParameterMetaData` "supportedDatabase" value.
`protected void`	`customLoadLogic(ParsedNode parsedNode, ResourceAccessor resourceAccessor)`
`boolean`	`equals(Object reference)`	Default implementation counts objects equal if their describe() methods return equal strings.
`void`	`finishInitialization()`	Default implementation is a no-op
`CheckSum`	`generateCheckSum()`	Implementation generates checksum by serializing the change with `StringChangeLogSerializer`
`SqlStatement[]`	`generateRollbackStatements(Database database)`	Implementation relies on value returned from `createInverses()`.
`boolean`	`generateRollbackStatementsVolatile(Database database)`	Implementation delegates logic to the `SqlGenerator.generateRollbackStatementsIsVolatile(Database)` method on the `SqlStatement` objects returned by `Change.generateStatements(liquibase.database.Database)` If no or null SqlStatements are returned by generateRollbackStatements then this method returns false.
`boolean`	`generateStatementsVolatile(Database database)`	Implementation delegates logic to the `SqlGenerator.generateStatementsIsVolatile(Database)` method on the `SqlStatement` objects returned by `Change.generateStatements(liquibase.database.Database)`.
`Set<DatabaseObject>`	`getAffectedDatabaseObjects(Database database)`	Implementation delegates logic to the `SqlGeneratorFactory.getAffectedDatabaseObjects(liquibase.statement.SqlStatement, liquibase.database.Database)` method on the `SqlStatement` objects returned by `Change.generateStatements(liquibase.database.Database)` Returns empty set if change is not supported for the passed database
`ChangeSet`	`getChangeSet()`	Returns the changeSet this Change is part of.
`String`	`getDescription()`	Short, scannable description for the DATABASECHANGELOG.DESCRIPTION column
`String[]`	`getExcludedFieldFilters(ChecksumVersion version)`
`ResourceAccessor`	`getResourceAccessor()`	Deprecated.
`String`	`getSerializableFieldNamespace(String field)`
`Set<String>`	`getSerializableFields()`	Returns the fields on this change that are serializable.
`LiquibaseSerializable.SerializationType`	`getSerializableFieldType(String field)`
`Object`	`getSerializableFieldValue(String field)`
`String`	`getSerializedObjectName()`
`String`	`getSerializedObjectNamespace()`
`int`	`hashCode()`
`protected boolean`	`isInvalidProperty(PropertyDescriptor property)`
`void`	`load(ParsedNode parsedNode, ResourceAccessor resourceAccessor)`
`void`	`modify(ChangeVisitor changeVisitor)`
`ParsedNode`	`serialize()`
`protected Object`	`serializeValue(Object value)`
`void`	`setChangeSet(ChangeSet changeSet)`	Sets the changeSet this Change is a part of.
`void`	`setResourceAccessor(ResourceAccessor resourceAccessor)`	Sets the `ResourceAccessor` that should be used for any file and/or resource loading needed by this Change.
`boolean`	`shouldExecuteChange(Database database)`	Return if this change should execute
`boolean`	`supports(Database database)`	Implementation delegates logic to the `SqlGenerator.supports(liquibase.statement.SqlStatement, liquibase.database.Database)` method on the `SqlStatement` objects returned by `Change.generateStatements(liquibase.database.Database)`.
`boolean`	`supportsRollback(Database database)`	Implementation returns true if `createInverses()` returns a non-null value.
`String`	`toString()`
`ValidationErrors`	`validate(Database database)`	Implementation checks the ChangeParameterMetaData for declared required fields and also delegates logic to the `SqlGenerator.validate(liquibase.statement.SqlStatement, liquibase.database.Database, liquibase.sqlgenerator.SqlGeneratorChain)` method on the `SqlStatement` objects returned by `Change.generateStatements(liquibase.database.Database)`.
`Warnings`	`warn(Database database)`	Implementation delegates logic to the `SqlGenerator.warn(liquibase.statement.SqlStatement, liquibase.database.Database, liquibase.sqlgenerator.SqlGeneratorChain)` method on the `SqlStatement` objects returned by `Change.generateStatements(liquibase.database.Database)`.

Methods inherited from class liquibase.AbstractExtensibleObject
clone, describe, get, get, get, getAttributes, getFieldValue, getObjectMetaData, getValuePath, has, set

Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface liquibase.change.Change
generateStatements, getConfirmationMessage

Methods inherited from interface liquibase.ExtensibleObject
clone, describe, get, get, getAttributes, getObjectMetaData, getValuePath, has, set

- Field Detail
  - NODENAME_COLUMN
```
protected static final String NODENAME_COLUMN
```
    See Also:
    
    Constant Field Values
- Constructor Detail
  - AbstractChange
```
public AbstractChange()
```
- Method Detail
  - finishInitialization
```
public void finishInitialization()
                          throws SetupException
```
    Default implementation is a no-op
    
    Specified by:
    
    finishInitialization in interface Change
    
    Throws:
    
    SetupException
  - createChangeMetaData
```
public ChangeMetaData createChangeMetaData()
```
    Generate the ChangeMetaData for this class. Default implementation reads from the @DatabaseChange annotation and calls out to createChangeParameterMetadata(String) for each property.
    
    Specified by:
    
    createChangeMetaData in interface Change
    
    Throws:
    
    UnexpectedLiquibaseException - if no @DatabaseChange annotation on this Change class
  - isInvalidProperty
```
protected boolean isInvalidProperty(PropertyDescriptor property)
```
  - createChangeParameterMetadata
```
protected ChangeParameterMetaData createChangeParameterMetadata(String parameterName)
```
    Called by createChangeMetaData() to create metadata for a given parameter. It finds the method that corresponds to the parameter and calls the corresponding create*MetaData methods such as createRequiredDatabasesMetaData(String, DatabaseChangeProperty) to determine the correct values for the ChangeParameterMetaData fields.
    
    Throws:
    
    UnexpectedLiquibaseException - if the passed parameter does not exist
  - createSinceMetaData
```
protected String createSinceMetaData(String parameterName,
                                     DatabaseChangeProperty changePropertyAnnotation)
```
    Create the ChangeParameterMetaData "since" value. Uses the value on the DatabaseChangeProperty annotation or returns null as a default.
  - createDescriptionMetaData
```
protected String createDescriptionMetaData(String parameterName,
                                           DatabaseChangeProperty changePropertyAnnotation)
```
    Create the ChangeParameterMetaData "description" value. Uses the value on the DatabaseChangeProperty annotation or returns null as a default.
  - createSerializationTypeMetaData
```
protected LiquibaseSerializable.SerializationType createSerializationTypeMetaData(String parameterName,
                                                                                  DatabaseChangeProperty changePropertyAnnotation)
```
    Create the ChangeParameterMetaData "serializationType" value. Uses the value on the DatabaseChangeProperty annotation or returns LiquibaseSerializable.SerializationType.NAMED_FIELD as a default.
  - createMustEqualExistingMetaData
```
protected String createMustEqualExistingMetaData(String parameterName,
                                                 DatabaseChangeProperty changePropertyAnnotation)
```
    Create the ChangeParameterMetaData "mustEqual" value. Uses the value on the DatabaseChangeProperty annotation or returns null as a default.
  - createExampleValueMetaData
```
protected Map<String,Object> createExampleValueMetaData(String parameterName,
                                                              DatabaseChangeProperty changePropertyAnnotation)
```
    Create the ChangeParameterMetaData "example" value. Uses the value on the DatabaseChangeProperty annotation or returns null as a default. Returns map with key=database short name, value=example. Use short-name "all" as the fallback.
  - createRequiredDatabasesMetaData
```
protected String[] createRequiredDatabasesMetaData(String parameterName,
                                                   DatabaseChangeProperty changePropertyAnnotation)
```
    Create the ChangeParameterMetaData "requiredDatabases" value. Uses the value on the DatabaseChangeProperty annotation or returns an array containing the string "COMPUTE" as a default. "COMPUTE" will cause ChangeParameterMetaData to attempt to determine the required databases based on the generated Statements
  - createSupportedDatabasesMetaData
```
protected String[] createSupportedDatabasesMetaData(String parameterName,
                                                    DatabaseChangeProperty changePropertyAnnotation)
```
    Create the ChangeParameterMetaData "supportedDatabase" value. Uses the value on the DatabaseChangeProperty annotation or returns an array containing the string "COMPUTE" as a default. "COMPUTE" will cause ChangeParameterMetaData to attempt to determine the required databases based on the generated Statements
  - createAlternateParameterNames
```
protected String[] createAlternateParameterNames(DatabaseChangeProperty changePropertyAnnotation)
```
  - getChangeSet
```
public ChangeSet getChangeSet()
```
    Returns the changeSet this Change is part of. Will return null if this instance was not constructed as part of a changelog file.
    
    Specified by:
    
    getChangeSet in interface Change
  - setChangeSet
```
public void setChangeSet(ChangeSet changeSet)
```
    Sets the changeSet this Change is a part of. Called automatically by Liquibase during the changelog parsing process.
    
    Specified by:
    
    setChangeSet in interface Change
  - generateStatementsVolatile
```
public boolean generateStatementsVolatile(Database database)
```
    Implementation delegates logic to the SqlGenerator.generateStatementsIsVolatile(Database) method on the SqlStatement objects returned by Change.generateStatements(liquibase.database.Database). If zero or null SqlStatements are returned by generateStatements then this method returns false.
    
    Specified by:
    
    generateStatementsVolatile in interface Change
  - generateRollbackStatementsVolatile
```
public boolean generateRollbackStatementsVolatile(Database database)
```
    Implementation delegates logic to the SqlGenerator.generateRollbackStatementsIsVolatile(Database) method on the SqlStatement objects returned by Change.generateStatements(liquibase.database.Database) If no or null SqlStatements are returned by generateRollbackStatements then this method returns false.
    
    Specified by:
    
    generateRollbackStatementsVolatile in interface Change
  - supports
```
public boolean supports(Database database)
```
    Implementation delegates logic to the SqlGenerator.supports(liquibase.statement.SqlStatement, liquibase.database.Database) method on the SqlStatement objects returned by Change.generateStatements(liquibase.database.Database). If no or null SqlStatements are returned by generateStatements then this method returns true. If generateStatementsVolatile(liquibase.database.Database) returns true, we cannot call generateStatements and so assume true.
    
    Specified by:
    
    supports in interface Change
  - warn
```
public Warnings warn(Database database)
```
    Implementation delegates logic to the SqlGenerator.warn(liquibase.statement.SqlStatement, liquibase.database.Database, liquibase.sqlgenerator.SqlGeneratorChain) method on the SqlStatement objects returned by Change.generateStatements(liquibase.database.Database). If a generated statement is not supported for the given database, no warning will be added since that is a validation error. If no or null SqlStatements are returned by generateStatements then this method returns no warnings.
    
    Specified by:
    
    warn in interface Change
  - validate
```
public ValidationErrors validate(Database database)
```
    Implementation checks the ChangeParameterMetaData for declared required fields and also delegates logic to the SqlGenerator.validate(liquibase.statement.SqlStatement, liquibase.database.Database, liquibase.sqlgenerator.SqlGeneratorChain) method on the SqlStatement objects returned by Change.generateStatements(liquibase.database.Database). If no or null SqlStatements are returned by generateStatements then this method returns no errors. If there are no parameters than this method returns no errors
    
    Specified by:
    
    validate in interface Change
  - checkStatus
```
public ChangeStatus checkStatus(Database database)
```
    Description copied from interface: Change
    
    Validate that this change executed successfully against the given database. This will check that the update completed at a high level plus check details of the change. For example, a change to add a column will check that the column exists plus data type, default values, etc.
    
    Specified by:
    
    checkStatus in interface Change
  - shouldExecuteChange
```
public boolean shouldExecuteChange(Database database)
```
    Return if this change should execute
    
    Parameters:
    
    database - Database we are working on
    
    Returns:
    
    boolean
  - generateRollbackStatements
```
public SqlStatement[] generateRollbackStatements(Database database)
                                          throws RollbackImpossibleException
```
    Implementation relies on value returned from createInverses().
    
    Specified by:
    
    generateRollbackStatements in interface Change
    
    Throws:
    
    RollbackImpossibleException - if rollback is not supported for this change
  - supportsRollback
```
public boolean supportsRollback(Database database)
```
    Implementation returns true if createInverses() returns a non-null value.
    
    Specified by:
    
    supportsRollback in interface Change
  - generateCheckSum
```
public CheckSum generateCheckSum()
```
    Implementation generates checksum by serializing the change with StringChangeLogSerializer
    
    Specified by:
    
    generateCheckSum in interface Change
  - getExcludedFieldFilters
```
public String[] getExcludedFieldFilters(ChecksumVersion version)
```
  - createInverses
```
protected Change[] createInverses()
```
    Create inverse changes that can roll back this change. This method is intended to be overridden by Change implementations that have a logical inverse operation. Default implementation returns null.
    If generateRollbackStatements(liquibase.database.Database) is overridden, this method may not be called.
    
    Returns:
    
    Return null if there is no corresponding inverse and therefore automatic rollback is not possible. Return an empty array to have a no-op rollback.
    
    See Also:
    
    #supportsRollback
  - getResourceAccessor
```
public ResourceAccessor getResourceAccessor()
```
    Deprecated.
  - setResourceAccessor
```
public void setResourceAccessor(ResourceAccessor resourceAccessor)
```
    Description copied from interface: Change
    
    Sets the ResourceAccessor that should be used for any file and/or resource loading needed by this Change. Called automatically by Liquibase during the changelog parsing process.
    
    Specified by:
    
    setResourceAccessor in interface Change
  - getAffectedDatabaseObjects
```
public Set<DatabaseObject> getAffectedDatabaseObjects(Database database)
```
    Implementation delegates logic to the SqlGeneratorFactory.getAffectedDatabaseObjects(liquibase.statement.SqlStatement, liquibase.database.Database) method on the SqlStatement objects returned by Change.generateStatements(liquibase.database.Database) Returns empty set if change is not supported for the passed database
    
    Specified by:
    
    getAffectedDatabaseObjects in interface Change
  - getSerializableFields
```
public Set<String> getSerializableFields()
```
    Returns the fields on this change that are serializable.
    
    Specified by:
    
    getSerializableFields in interface LiquibaseSerializable
  - getSerializableFieldValue
```
public Object getSerializableFieldValue(String field)
```
    Specified by:
    
    getSerializableFieldValue in interface LiquibaseSerializable
  - getSerializedObjectName
```
public String getSerializedObjectName()
```
    Specified by:
    
    getSerializedObjectName in interface LiquibaseSerializable
  - getSerializableFieldType
```
public LiquibaseSerializable.SerializationType getSerializableFieldType(String field)
```
    Specified by:
    
    getSerializableFieldType in interface LiquibaseSerializable
  - getSerializedObjectNamespace
```
public String getSerializedObjectNamespace()
```
    Specified by:
    
    getSerializedObjectNamespace in interface LiquibaseSerializable
  - getSerializableFieldNamespace
```
public String getSerializableFieldNamespace(String field)
```
    Specified by:
    
    getSerializableFieldNamespace in interface LiquibaseSerializable
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class AbstractExtensibleObject
  - load
```
public void load(ParsedNode parsedNode,
                 ResourceAccessor resourceAccessor)
          throws ParsedNodeException
```
    Specified by:
    
    load in interface LiquibaseSerializable
    
    Throws:
    
    ParsedNodeException
  - createEmptyColumnConfig
```
protected ColumnConfig createEmptyColumnConfig(Class collectionType)
                                        throws ReflectiveOperationException
```
    Throws:
    
    ReflectiveOperationException
  - customLoadLogic
```
protected void customLoadLogic(ParsedNode parsedNode,
                               ResourceAccessor resourceAccessor)
                        throws ParsedNodeException
```
    Throws:
    
    ParsedNodeException
  - serialize
```
public ParsedNode serialize()
                     throws ParsedNodeException
```
    Specified by:
    
    serialize in interface LiquibaseSerializable
    
    Throws:
    
    ParsedNodeException
  - serializeValue
```
protected Object serializeValue(Object value)
                         throws ParsedNodeException
```
    Throws:
    
    ParsedNodeException
  - getDescription
```
public String getDescription()
```
    Description copied from interface: Change
    
    Short, scannable description for the DATABASECHANGELOG.DESCRIPTION column
    
    Specified by:
    
    getDescription in interface Change
  - modify
```
public void modify(ChangeVisitor changeVisitor)
            throws ParsedNodeException
```
    Specified by:
    
    modify in interface Change
    
    Throws:
    
    ParsedNodeException - if there is an error processing ChangeVisitor
  - equals
```
public boolean equals(Object reference)
```
    Description copied from class: AbstractExtensibleObject
    
    Default implementation counts objects equal if their describe() methods return equal strings.
    
    Overrides:
    
    equals in class AbstractExtensibleObject
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class AbstractExtensibleObject

Class AbstractChange

Nested Class Summary

Nested classes/interfaces inherited from interface liquibase.serializer.LiquibaseSerializable

Field Summary

Fields inherited from interface liquibase.change.Change

Fields inherited from interface liquibase.serializer.LiquibaseSerializable

Fields inherited from interface liquibase.plugin.Plugin

Constructor Summary

Method Summary

Methods inherited from class liquibase.AbstractExtensibleObject

Methods inherited from class java.lang.Object

Methods inherited from interface liquibase.change.Change

Methods inherited from interface liquibase.ExtensibleObject

Field Detail

NODENAME_COLUMN

Constructor Detail

AbstractChange

Method Detail

finishInitialization

createChangeMetaData

isInvalidProperty

createChangeParameterMetadata

createSinceMetaData

createDescriptionMetaData

createSerializationTypeMetaData

createMustEqualExistingMetaData

createExampleValueMetaData

createRequiredDatabasesMetaData

createSupportedDatabasesMetaData

createAlternateParameterNames

getChangeSet

setChangeSet

generateStatementsVolatile

generateRollbackStatementsVolatile

supports

warn

validate

checkStatus

shouldExecuteChange

generateRollbackStatements

supportsRollback

generateCheckSum

getExcludedFieldFilters

createInverses

getResourceAccessor

setResourceAccessor

getAffectedDatabaseObjects

getSerializableFields

getSerializableFieldValue

getSerializedObjectName

getSerializableFieldType

getSerializedObjectNamespace

getSerializableFieldNamespace

toString

load

createEmptyColumnConfig

customLoadLogic

serialize

serializeValue

getDescription

modify

equals

hashCode