Package net.sourceforge.pmd.lang.java.ast

Class ASTList<N extends JavaNode>

java.lang.Object

net.sourceforge.pmd.lang.ast.impl.AbstractNode<B,N>

net.sourceforge.pmd.lang.ast.impl.javacc.AbstractJjtreeNode<net.sourceforge.pmd.lang.java.ast.AbstractJavaNode,JavaNode>

net.sourceforge.pmd.lang.java.ast.ASTList<N>

Type Parameters:

N - Type of node contained within this list node

All Implemented Interfaces:

Iterable<N>, GenericNode<JavaNode>, JjtreeNode<JavaNode>, Node, TextAvailableNode, JavaNode, Reportable

Direct Known Subclasses:

ASTAnnotationMemberList, ASTArgumentList, ASTArrayDimensions, ASTBlock, ASTExtendsList, ASTFormalParameters, ASTImplementsList, ASTLambdaParameterList, ASTPatternList, ASTPermitsList, ASTRecordComponentList, ASTResourceList, ASTStatementExpressionList, ASTThrowsList, ASTTypeArguments, ASTTypeBody, ASTTypeParameters

public abstract class ASTList<N extends JavaNode>
extends AbstractJjtreeNode<net.sourceforge.pmd.lang.java.ast.AbstractJavaNode,JavaNode>
implements Iterable<N>

Common supertype for nodes that act as a kind of list of other nodes. This is mainly provided as a way to share API and not a structural distinction in the AST.

This node can be converted to a list with toList(). Often these nodes are optional in their parent, and so might be null. The method orEmpty helps in such cases. For example

 // This will throw NullPointerException if the class is not generic.
 for (ASTTypeParameter tparam : classDecl.getTypeParameters()) {

 }
 

Instead of explicitly checking for null, which is annoying, use the following idiom:

 for (ASTTypeParameter tparam : ASTList.orEmpty(classDecl.getTypeParameters())) {

 }
 

Note that though it is usually the case that the node lists all its children, there is no guarantee about that. For instance, ASTFormalParameters excludes the receiver parameter.

Field Summary

Fields

Modifier and Type	Field	Description
protected Class<N>	elementType
protected JSymbolTable	symbolTable

Fields inherited from class net.sourceforge.pmd.lang.ast.impl.javacc.AbstractJjtreeNode

id

Fields inherited from interface net.sourceforge.pmd.lang.ast.Node

COORDS_COMPARATOR

Method Summary

Modifier and Type	Method	Description
<P,R> R	acceptVisitor(AstVisitor<? super P,? extends R> visitor, P data)
protected abstract <P,R> R	acceptVisitor(JavaVisitor<? super P,? extends R> visitor, P data)
protected void	addChild(net.sourceforge.pmd.lang.java.ast.AbstractJavaNode child, int index)
protected void	enlargeLeft(JavaccToken child)
N	get(int i)
@NonNull ASTCompilationUnit	getRoot()
@NonNull JSymbolTable	getSymbolTable()	Returns the symbol table for the program point represented by this node.
TypeSystem	getTypeSystem()	Returns the type system with which this node was created.
String	getXPathNodeName()
protected void	insertChild(net.sourceforge.pmd.lang.java.ast.AbstractJavaNode child, int index)
boolean	isEmpty()
Iterator<N>	iterator()
void	jjtClose()
static <N extends JavaNode> @NonNull List<N>	orEmpty(@Nullable ASTList<N> list)	Returns an empty list if the parameter is null, otherwise returns its toList().
static <N extends JavaNode> @NonNull NodeStream<N>	orEmptyStream(@Nullable ASTList<N> list)
protected void	removeChildAtIndex(int childIndex)
protected void	setChild(net.sourceforge.pmd.lang.java.ast.AbstractJavaNode child, int index)
protected void	setFirstToken(JavaccToken token)
protected void	setImage(String image)
protected void	setLastToken(JavaccToken token)
static <N extends JavaNode> @Nullable N	singleOrNull(@Nullable ASTList<N> list)	Returns the element if there is exactly one, otherwise returns null.
int	size()	Returns the number of nodes in this list.
static int	sizeOrZero(@Nullable ASTList<?> list)
List<N>	toList()	Returns a list containing the element of this node.
NodeStream<N>	toStream()	Returns a node stream containing the same element this node contains.

Methods inherited from class net.sourceforge.pmd.lang.ast.impl.javacc.AbstractJjtreeNode

compareLocation, fitTokensToChildren, getFirstToken, getImage, getLastToken, getTextRegion, jjtOpen, toString

Methods inherited from class net.sourceforge.pmd.lang.ast.impl.AbstractNode

children, firstChild, getChild, getIndexInParent, getNumChildren, getParent, getUserMap, remove, setParent

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface net.sourceforge.pmd.lang.ast.impl.GenericNode

ancestors, ancestorsOrSelf, asStream, children, descendants, descendantsOrSelf, getChild, getFirstChild, getLastChild, getNextSibling, getParent, getPreviousSibling

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Methods inherited from interface net.sourceforge.pmd.lang.java.ast.JavaNode

getEnclosingType

Methods inherited from interface net.sourceforge.pmd.lang.ast.impl.javacc.JjtreeNode

getFirstToken, getLastToken, tokens

Methods inherited from interface net.sourceforge.pmd.lang.ast.Node

ancestors, children, compareLocation, descendants, firstChild, getAstInfo, getBeginColumn, getBeginLine, getEndColumn, getEndLine, getImage, getIndexInParent, getLanguageVersion, getNumChildren, getReportLocation, getTextDocument, getUserMap, getXPathAttributesIterator, hasImageEqualTo, isFindBoundary

Methods inherited from interface net.sourceforge.pmd.lang.ast.TextAvailableNode

getOriginalText, getText, getTextRegion

Field Detail

elementType

protected final Class<N extends JavaNode> elementType

symbolTable

protected JSymbolTable symbolTable

Method Detail

size

public int size()

Returns the number of nodes in this list. This must be the number of nodes yielded by the iterator().

isEmpty

public boolean isEmpty()

toList

public List<N> toList()

Returns a list containing the element of this node.

toStream

public NodeStream<N> toStream()

Returns a node stream containing the same element this node contains.

iterator

public Iterator<N> iterator()

Specified by:

iterator in interface Iterable<N extends JavaNode>

get

public N get(int i)

Throws:

IndexOutOfBoundsException - if not in range

orEmpty

public static <N extends JavaNode> @NonNull List<N> orEmpty(@Nullable ASTList<N> list)

Returns an empty list if the parameter is null, otherwise returns its toList().

Type Parameters:

N - Type of elements

Parameters:

list - List node

Returns:

A non-null list

orEmptyStream

public static <N extends JavaNode> @NonNull NodeStream<N> orEmptyStream(@Nullable ASTList<N> list)

sizeOrZero

public static int sizeOrZero(@Nullable ASTList<?> list)

singleOrNull

public static <N extends JavaNode> @Nullable N singleOrNull(@Nullable ASTList<N> list)

Returns the element if there is exactly one, otherwise returns null.

Type Parameters:

N - Type of elements

Parameters:

list - List node

Returns:

An element, or null.

jjtClose

public void jjtClose()

Overrides:

jjtClose in class AbstractJjtreeNode<net.sourceforge.pmd.lang.java.ast.AbstractJavaNode,JavaNode>

acceptVisitor

public final <P,R> R acceptVisitor(AstVisitor<? super P,? extends R> visitor,
                                         P data)

Specified by:

acceptVisitor in interface Node

acceptVisitor

protected abstract <P,R> R acceptVisitor(JavaVisitor<? super P,? extends R> visitor,
                                               P data)

addChild

protected void addChild(net.sourceforge.pmd.lang.java.ast.AbstractJavaNode child,
                        int index)

Overrides:

addChild in class AbstractJjtreeNode<net.sourceforge.pmd.lang.java.ast.AbstractJavaNode,JavaNode>

insertChild

protected void insertChild(net.sourceforge.pmd.lang.java.ast.AbstractJavaNode child,
                           int index)

Overrides:

insertChild in class AbstractJjtreeNode<net.sourceforge.pmd.lang.java.ast.AbstractJavaNode,JavaNode>

removeChildAtIndex

protected void removeChildAtIndex(int childIndex)

Overrides:

removeChildAtIndex in class AbstractNode<net.sourceforge.pmd.lang.java.ast.AbstractJavaNode,JavaNode>

setImage

protected void setImage(String image)

Overrides:

setImage in class AbstractJjtreeNode<net.sourceforge.pmd.lang.java.ast.AbstractJavaNode,JavaNode>

setFirstToken

protected void setFirstToken(JavaccToken token)

Overrides:

setFirstToken in class AbstractJjtreeNode<net.sourceforge.pmd.lang.java.ast.AbstractJavaNode,JavaNode>

setLastToken

protected void setLastToken(JavaccToken token)

Overrides:

setLastToken in class AbstractJjtreeNode<net.sourceforge.pmd.lang.java.ast.AbstractJavaNode,JavaNode>

enlargeLeft

protected void enlargeLeft(JavaccToken child)

Overrides:

enlargeLeft in class AbstractJjtreeNode<net.sourceforge.pmd.lang.java.ast.AbstractJavaNode,JavaNode>

setChild

protected void setChild(net.sourceforge.pmd.lang.java.ast.AbstractJavaNode child,
                        int index)

Overrides:

setChild in class AbstractNode<net.sourceforge.pmd.lang.java.ast.AbstractJavaNode,JavaNode>

getSymbolTable

public @NonNull JSymbolTable getSymbolTable()

Description copied from interface: JavaNode

Returns the symbol table for the program point represented by this node.

Specified by:

getSymbolTable in interface JavaNode

getTypeSystem

public TypeSystem getTypeSystem()

Description copied from interface: JavaNode

Returns the type system with which this node was created. This is the object responsible for representing types in the compilation unit.

Specified by:

getTypeSystem in interface JavaNode

getRoot

public final @NonNull ASTCompilationUnit getRoot()

Specified by:

getRoot in interface JavaNode

Specified by:

getRoot in interface Node

getXPathNodeName

public final String getXPathNodeName()

Specified by:

getXPathNodeName in interface Node