Copyright (c) 2000, 2013 IBM Corporation and others.
This program and the accompanying materials
are made available under the terms of the Eclipse Public License 2.0
which accompanies this distribution, and is available at
https://www.eclipse.org/legal/epl-2.0/
SPDX-License-Identifier: EPL-2.0
Contributors:
IBM Corporation - initial API and implementation
/*******************************************************************************
* Copyright (c) 2000, 2013 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jdt.core.dom;
import java.util.ArrayList;
import java.util.List;
Expression statement AST node type.
This kind of node is used to convert an expression (Expression
)
into a statement (Statement
) by wrapping it.
ExpressionStatement:
StatementExpression ;
Since: 2.0 @noinstantiate This class is not intended to be instantiated by clients.
/**
* Expression statement AST node type.
* <p>
* This kind of node is used to convert an expression (<code>Expression</code>)
* into a statement (<code>Statement</code>) by wrapping it.
* </p>
* <pre>
* ExpressionStatement:
* StatementExpression <b>;</b>
* </pre>
*
* @since 2.0
* @noinstantiate This class is not intended to be instantiated by clients.
*/
@SuppressWarnings("rawtypes")
public class ExpressionStatement extends Statement {
The "expression" structural property of this node type (child type: Expression
). Since: 3.0
/**
* The "expression" structural property of this node type (child type: {@link Expression}).
* @since 3.0
*/
public static final ChildPropertyDescriptor EXPRESSION_PROPERTY =
new ChildPropertyDescriptor(ExpressionStatement.class, "expression", Expression.class, MANDATORY, CYCLE_RISK); //$NON-NLS-1$
A list of property descriptors (element type: StructuralPropertyDescriptor
), or null if uninitialized. /**
* A list of property descriptors (element type:
* {@link StructuralPropertyDescriptor}),
* or null if uninitialized.
*/
private static final List PROPERTY_DESCRIPTORS;
static {
List properyList = new ArrayList(2);
createPropertyList(ExpressionStatement.class, properyList);
addProperty(EXPRESSION_PROPERTY, properyList);
PROPERTY_DESCRIPTORS = reapPropertyList(properyList);
}
Returns a list of structural property descriptors for this node type.
Clients must not modify the result.
Params: - apiLevel – the API level; one of the
AST.JLS*
constants
Returns: a list of property descriptors (element type: StructuralPropertyDescriptor
) Since: 3.0
/**
* Returns a list of structural property descriptors for this node type.
* Clients must not modify the result.
*
* @param apiLevel the API level; one of the
* <code>AST.JLS*</code> constants
* @return a list of property descriptors (element type:
* {@link StructuralPropertyDescriptor})
* @since 3.0
*/
public static List propertyDescriptors(int apiLevel) {
return PROPERTY_DESCRIPTORS;
}
The expression; lazily initialized; defaults to a unspecified, but legal,
expression.
/**
* The expression; lazily initialized; defaults to a unspecified, but legal,
* expression.
*/
private Expression expression = null;
Creates a new unparented expression statement node owned by the given
AST. By default, the expression statement is unspecified, but legal,
method invocation expression.
N.B. This constructor is package-private.
Params: - ast – the AST that is to own this node
/**
* Creates a new unparented expression statement node owned by the given
* AST. By default, the expression statement is unspecified, but legal,
* method invocation expression.
* <p>
* N.B. This constructor is package-private.
* </p>
*
* @param ast the AST that is to own this node
*/
ExpressionStatement(AST ast) {
super(ast);
}
@Override
final List internalStructuralPropertiesForType(int apiLevel) {
return propertyDescriptors(apiLevel);
}
@Override
final ASTNode internalGetSetChildProperty(ChildPropertyDescriptor property, boolean get, ASTNode child) {
if (property == EXPRESSION_PROPERTY) {
if (get) {
return getExpression();
} else {
setExpression((Expression) child);
return null;
}
}
// allow default implementation to flag the error
return super.internalGetSetChildProperty(property, get, child);
}
@Override
final int getNodeType0() {
return EXPRESSION_STATEMENT;
}
@Override
ASTNode clone0(AST target) {
ExpressionStatement result = new ExpressionStatement(target);
result.setSourceRange(getStartPosition(), getLength());
result.copyLeadingComment(this);
result.setExpression((Expression) getExpression().clone(target));
return result;
}
@Override
final boolean subtreeMatch0(ASTMatcher matcher, Object other) {
// dispatch to correct overloaded match method
return matcher.match(this, other);
}
@Override
void accept0(ASTVisitor visitor) {
boolean visitChildren = visitor.visit(this);
if (visitChildren) {
acceptChild(visitor, getExpression());
}
visitor.endVisit(this);
}
Returns the expression of this expression statement.
Returns: the expression node
/**
* Returns the expression of this expression statement.
*
* @return the expression node
*/
public Expression getExpression() {
if (this.expression == null) {
// lazy init must be thread-safe for readers
synchronized (this) {
if (this.expression == null) {
preLazyInit();
this.expression = new MethodInvocation(this.ast);
postLazyInit(this.expression, EXPRESSION_PROPERTY);
}
}
}
return this.expression;
}
Sets the expression of this expression statement.
Params: - expression – the new expression node
Throws: - IllegalArgumentException – if:
- the node belongs to a different AST
- the node already has a parent
- a cycle in would be created
/**
* Sets the expression of this expression statement.
*
* @param expression the new expression node
* @exception IllegalArgumentException if:
* <ul>
* <li>the node belongs to a different AST</li>
* <li>the node already has a parent</li>
* <li>a cycle in would be created</li>
* </ul>
*/
public void setExpression(Expression expression) {
if (expression == null) {
throw new IllegalArgumentException();
}
ASTNode oldChild = this.expression;
preReplaceChild(oldChild, expression, EXPRESSION_PROPERTY);
this.expression = expression;
postReplaceChild(oldChild, expression, EXPRESSION_PROPERTY);
}
@Override
int memSize() {
return super.memSize() + 1 * 4;
}
@Override
int treeSize() {
return
memSize()
+ (this.expression == null ? 0 : getExpression().treeSize());
}
}