Package org.apache.jackrabbit.oak.plugins.document.secondary

Class DelegatingDocumentNodeState

  • All Implemented Interfaces:
    NodeState
    public class DelegatingDocumentNodeState
extends AbstractDocumentNodeState
    NodeState wrapper which wraps another NodeState (mostly SegmentNodeState) so as to expose it as an AbstractDocumentNodeState by extracting the meta properties which are stored as hidden properties

    • Method Detail

      • wrapIfPossible

        public static NodeState wrapIfPossible​(NodeState delegate,
                                       NodeStateDiffer differ)
        Wraps a given root NodeState as a DelegatingDocumentNodeState if it has required meta properties otherwise just returns the passed NodeState
        Parameters:
        delegate - nodeState to wrap
        Returns:
        wrapped state or original state

      • hasMetaProps

        public static boolean hasMetaProps​(NodeState delegate)

      • exists

        public boolean exists()
        Description copied from interface: NodeState
        Checks whether this node exists. See the above discussion about the existence of node states.
        Returns:
        true if this node exists, false if not

      • getProperties

        @NotNull
public @NotNull Iterable<? extends PropertyState> getProperties()
        Description copied from interface: NodeState
        Returns an iterable of the properties of this node. Multiple iterations are guaranteed to return the properties in the same order, but the specific order used is implementation-dependent and may change across different states of the same node.
        Returns:
        properties in some stable order

      • hasChildNode

        public boolean hasChildNode​(@NotNull
                            @NotNull String name)
        Description copied from interface: NodeState
        Checks whether the named child node exists. The implementation is equivalent to getChildNode(name).exists(), except that passing an invalid name as argument will result in a false return value instead of an IllegalArgumentException.
        Parameters:
        name - name of the child node
        Returns:
        true if the named child node exists, false otherwise

      • getChildNode

        @NotNull
public @NotNull NodeState getChildNode​(@NotNull
                                       @NotNull String name)
                                throws IllegalArgumentException
        Description copied from interface: NodeState
        Returns the named, possibly non-existent, child node. Use the NodeState.exists() method on the returned child node to determine whether the node exists or not.
        Parameters:
        name - name of the child node to return
        Returns:
        named child node
        Throws:
        IllegalArgumentException - if the given name string is is empty or contains a forward slash character

      • getChildNodeEntries

        @NotNull
public @NotNull Iterable<? extends ChildNodeEntry> getChildNodeEntries()
        Description copied from interface: NodeState
        Returns the iterable child node entries of this instance. Multiple iterations are guaranteed to return the child nodes in the same order, but the specific order used is implementation dependent and may change across different states of the same node.

        Note on cost and performance: while it is possible to iterate over all child NodeStates with the two methods NodeState.getChildNodeNames() and NodeState.getChildNode(String), this method is considered more efficient because an implementation can potentially perform the retrieval of the name and NodeState in one call. This results in O(n) vs. O(n log n) when iterating over the child node names and then look up the NodeState by name.

        Returns:
        child node entries in some stable order

      • builder

        @NotNull
public @NotNull NodeBuilder builder()
        Description copied from interface: NodeState
        Returns a builder for constructing a new node state based on this state, i.e. starting with all the properties and child nodes of this state.
        Returns:
        node builder based on this state

      • 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
        Overrides:
        getProperty in class AbstractNodeState
        Parameters:
        name - name of the property to return
        Returns:
        named property, or null if not found

      • 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
        Overrides:
        hasProperty in class AbstractNodeState
        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
        Overrides:
        getBoolean in class AbstractNodeState
        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
        Overrides:
        getLong in class AbstractNodeState
        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
        Overrides:
        getString in class AbstractNodeState
        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
        Overrides:
        getStrings in class AbstractNodeState
        Parameters:
        name - property name
        Returns:
        string values of the named property, or an empty collection

      • getName

        public 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
        Overrides:
        getName in class AbstractNodeState
        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
        Overrides:
        getNames in class AbstractNodeState
        Parameters:
        name - property name
        Returns:
        name values of the named property, or an empty collection

      • 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
        Overrides:
        getChildNodeCount in class AbstractNodeState
        Parameters:
        max - the maximum number of entries to traverse
        Returns:
        number of iterable child nodes