Package org.apache.jackrabbit.oak.spi.state

Class AbstractNodeState

java.lang.Object

org.apache.jackrabbit.oak.spi.state.AbstractNodeState

All Implemented Interfaces:

NodeState

Direct Known Subclasses:

AbstractDecoratedNodeState, ModifiedNodeState

public abstract class AbstractNodeState
extends Object
implements NodeState

Abstract base class for NodeState implementations. This base class contains default implementations of the equals(Object) and hashCode() methods based on the implemented interface.

This class also implements trivial (and potentially very slow) versions of the getProperty(String) and getPropertyCount() methods based on NodeState.getProperties(). The getChildNodeCount(long) method is similarly implemented based on NodeState.getChildNodeEntries(). Subclasses should normally override these method with a more efficient alternatives.

Field Summary

Fields inherited from interface org.apache.jackrabbit.oak.spi.state.NodeState

EXISTS

Constructor Summary

Constructors

Constructor	Description
AbstractNodeState()

Method Summary

Modifier and Type	Method	Description
static void	checkValidName(String name)
boolean	compareAgainstBaseState(NodeState base, NodeStateDiff diff)	Generic default comparison algorithm that simply walks through the property and child node lists of the given base state and compares the entries one by one with corresponding ones (if any) in this state.
static boolean	compareAgainstBaseState(NodeState state, NodeState base, NodeStateDiff diff)	Generic default comparison algorithm that simply walks through the property and child node lists of the given base state and compares the entries one by one with corresponding ones (if any) in this state.
static boolean	comparePropertiesAgainstBaseState(NodeState state, NodeState base, NodeStateDiff diff)	Compares the properties of base state with this state.
boolean	equals(Object that)	Checks whether the given object is equal to this one.
static boolean	equals(NodeState a, NodeState b)
boolean	getBoolean(@NotNull String name)	Returns the boolean value of the named property.
static boolean	getBoolean(NodeState state, String name)
long	getChildNodeCount(long max)	Returns the number of iterable child nodes of this node.
Iterable<String>	getChildNodeNames()	Returns the names of all iterable child nodes.
long	getLong(String name)	Returns the long value of the named property.
static long	getLong(NodeState state, String name)
@Nullable String	getName(@NotNull String name)	Returns the name value of the named property.
static String	getName(NodeState state, String name)
@NotNull Iterable<String>	getNames(@NotNull String name)	Returns the name values of the named property.
static Iterable<String>	getNames(NodeState state, String name)
PropertyState	getProperty(@NotNull String name)	Returns the named property, or null if no such property exists.
long	getPropertyCount()	Returns the number of properties of this node.
String	getString(String name)	Returns the string value of the named property.
static String	getString(NodeState state, String name)
@NotNull Iterable<String>	getStrings(@NotNull String name)	Returns the string values of the named property.
static Iterable<String>	getStrings(NodeState state, String name)
int	hashCode()	Returns a hash code that's compatible with how the equals(Object) method is implemented.
boolean	hasProperty(@NotNull String name)	Checks whether the named property exists.
static boolean	isValidName(String name)
String	toString()	Returns a string representation of this node state.
static String	toString(NodeState state)

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.jackrabbit.oak.spi.state.NodeState

builder, exists, getChildNode, getChildNodeEntries, getProperties, hasChildNode

Constructor Detail

AbstractNodeState

public AbstractNodeState()

Method Detail

isValidName

public static boolean isValidName(String name)

checkValidName

public static void checkValidName(String name)
                           throws IllegalArgumentException

Throws:

IllegalArgumentException

getBoolean

public static boolean getBoolean(NodeState state,
                                 String name)

getLong

public static long getLong(NodeState state,
                           String name)

getString

public static String getString(NodeState state,
                               String name)

getStrings

public static Iterable<String> getStrings(NodeState state,
                                          String name)

getName

public static String getName(NodeState state,
                             String name)

getNames

public static Iterable<String> getNames(NodeState state,
                                        String name)

compareAgainstBaseState

public static boolean compareAgainstBaseState(NodeState state,
                                              NodeState base,
                                              NodeStateDiff diff)

Generic default comparison algorithm that simply walks through the property and child node lists of the given base state and compares the entries one by one with corresponding ones (if any) in this state.

comparePropertiesAgainstBaseState

public static boolean comparePropertiesAgainstBaseState(NodeState state,
                                                        NodeState base,
                                                        NodeStateDiff diff)

Compares the properties of base state with this state.

Parameters:

state - the head node state.

base - the base node state.

diff - the node state diff.

Returns:

true to continue the comparison, false to stop

toString

public static String toString(NodeState state)

hasProperty

public boolean hasProperty(@NotNull
                           @NotNull String name)

Description copied from interface: NodeState

Checks whether the named property exists. The implementation is equivalent to getProperty(name) != null, but may be optimized to avoid having to load the property value.

Specified by:

hasProperty in interface NodeState

Parameters:

name - property name

Returns:

true if the named property exists, false otherwise

getBoolean

public boolean getBoolean(@NotNull
                          @NotNull String name)

Description copied from interface: NodeState

Returns the boolean value of the named property. The implementation is equivalent to the following code, but may be optimized.

 
 PropertyState property = state.getProperty(name);
 return property != null
     && property.getType() == Type.BOOLEAN
     && property.getValue(Type.BOOLEAN);
 
 

Specified by:

getBoolean in interface NodeState

Parameters:

name - property name

Returns:

boolean value of the named property, or false

getLong

public long getLong(String name)

Description copied from interface: NodeState

Returns the long value of the named property. The implementation is equivalent to the following code, but may be optimized.

 
 PropertyState property = state.getProperty(name);
 if (property != null && property.getType() == Type.LONG) {
     return property.getValue(Type.LONG);
 } else {
     return 0;
 }
 
 

Specified by:

getLong in interface NodeState

Parameters:

name - property name

Returns:

long value of the named property, or zero

getString

public String getString(String name)

Description copied from interface: NodeState

Returns the string value of the named property. The implementation is equivalent to the following code, but may be optimized.

 
 PropertyState property = state.getProperty(name);
 if (property != null && property.getType() == Type.STRING) {
     return property.getValue(Type.STRING);
 } else {
     return null;
 }
 
 

Specified by:

getString in interface NodeState

Parameters:

name - property name

Returns:

string value of the named property, or null

getStrings

@NotNull
public @NotNull Iterable<String> getStrings(@NotNull
                                            @NotNull String name)

Description copied from interface: NodeState

Returns the string values of the named property. The implementation is equivalent to the following code, but may be optimized.

 
 PropertyState property = state.getProperty(name);
 if (property != null && property.getType() == Type.STRINGS) {
     return property.getValue(Type.STRINGS);
 } else {
     return Collections.emptyList();
 }
 
 

Specified by:

getStrings in interface NodeState

Parameters:

name - property name

Returns:

string values of the named property, or an empty collection

getName

@Nullable
public @Nullable String getName(@NotNull
                                @NotNull String name)

Description copied from interface: NodeState

Returns the name value of the named property. The implementation is equivalent to the following code, but may be optimized.

 
 PropertyState property = state.getProperty(name);
 if (property != null && property.getType() == Type.NAME) {
     return property.getValue(Type.NAME);
 } else {
     return null;
 }
 
 

Specified by:

getName in interface NodeState

Parameters:

name - property name

Returns:

name value of the named property, or null

getNames

@NotNull
public @NotNull Iterable<String> getNames(@NotNull
                                          @NotNull String name)

Description copied from interface: NodeState

Returns the name values of the named property. The implementation is equivalent to the following code, but may be optimized.

 
 PropertyState property = state.getProperty(name);
 if (property != null && property.getType() == Type.NAMES) {
     return property.getValue(Type.NAMES);
 } else {
     return Collections.emptyList();
 }
 
 

Specified by:

getNames in interface NodeState

Parameters:

name - property name

Returns:

name values of the named property, or an empty collection

getProperty

public PropertyState getProperty(@NotNull
                                 @NotNull String name)

Description copied from interface: NodeState

Returns the named property, or null if no such property exists.

Specified by:

getProperty in interface NodeState

Parameters:

name - name of the property to return

Returns:

named property, or null if not found

getPropertyCount

public long getPropertyCount()

Description copied from interface: NodeState

Returns the number of properties of this node.

Specified by:

getPropertyCount in interface NodeState

Returns:

number of properties

getChildNodeCount

public long getChildNodeCount(long max)

Description copied from interface: NodeState

Returns the number of iterable child nodes of this node.

If an implementation knows the exact value, it returns it (even if the value is higher than max). If the implementation does not know the exact value, and the child node count is higher than max, it may return Long.MAX_VALUE. The cost of the operation is at most O(max).

Specified by:

getChildNodeCount in interface NodeState

Parameters:

max - the maximum number of entries to traverse

Returns:

number of iterable child nodes

getChildNodeNames

public Iterable<String> getChildNodeNames()

Description copied from interface: NodeState

Returns the names of all iterable child nodes.

Specified by:

getChildNodeNames in interface NodeState

Returns:

child node names in some stable order

compareAgainstBaseState

public boolean compareAgainstBaseState(NodeState base,
                                       NodeStateDiff diff)

Generic default comparison algorithm that simply walks through the property and child node lists of the given base state and compares the entries one by one with corresponding ones (if any) in this state.

Specified by:

compareAgainstBaseState in interface NodeState

Parameters:

base - base state

diff - handler of node state differences

Returns:

true if the full diff was performed, or false if it was aborted as requested by the handler (see the NodeStateDiff contract for more details)

toString

public String toString()

Returns a string representation of this node state.

Overrides:

toString in class Object

Returns:

string representation

equals

public boolean equals(Object that)

Checks whether the given object is equal to this one. Two node states are considered equal if all their properties and child nodes match, regardless of ordering. Subclasses may override this method with a more efficient equality check if one is available.

Overrides:

equals in class Object

Parameters:

that - target of the comparison

Returns:

true if the objects are equal, false otherwise

equals

public static boolean equals(NodeState a,
                             NodeState b)

hashCode

public int hashCode()

Returns a hash code that's compatible with how the equals(Object) method is implemented. The current implementation simply returns zero for everything since NodeState instances are not intended for use as hash keys.

Overrides:

hashCode in class Object

Returns:

hash code