+ * PrefixExpression: + * PrefixOperator Expression + *+ * + * @since 2.0 + * @noinstantiate This class is not intended to be instantiated by clients. + */ +public class PrefixExpression extends Expression { + + /** + * Prefix operators (typesafe enumeration). + *
+ * PrefixOperator: + *+ */ + public static class Operator { + + /** + * The token for the operator. + */ + private String token; + + /** + * Creates a new prefix operator with the given token. + *++INCREMENT+ *--DECREMENT+ *+PLUS+ *-MINUS+ *~COMPLEMENT+ *!NOT+ *
+ * Note: this constructor is private. The only instances + * ever created are the ones for the standard operators. + *
+ * + * @param token the character sequence for the operator + */ + private Operator(String token) { + this.token = token; + } + + /** + * Returns the character sequence for the operator. + * + * @return the character sequence for the operator + */ + public String toString() { + return token; + } + + /** Prefix increment "++" operator. */ + public static final Operator INCREMENT = new Operator("++");//$NON-NLS-1$ + /** Prefix decrement "--" operator. */ + public static final Operator DECREMENT = new Operator("--");//$NON-NLS-1$ + /** Unary plus "+" operator. */ + public static final Operator PLUS = new Operator("+");//$NON-NLS-1$ + /** Unary minus "-" operator. */ + public static final Operator MINUS = new Operator("-");//$NON-NLS-1$ + /** Bitwise complement "~" operator. */ + public static final Operator COMPLEMENT = new Operator("~");//$NON-NLS-1$ + /** Logical complement "!" operator. */ + public static final Operator NOT = new Operator("!");//$NON-NLS-1$ + + /** + * Map from token to operator (key type:String;
+ * value type: Operator).
+ */
+ private static final Map CODES;
+ static {
+ CODES = new HashMap(20);
+ Operator[] ops = {
+ INCREMENT,
+ DECREMENT,
+ PLUS,
+ MINUS,
+ COMPLEMENT,
+ NOT,
+ };
+ for (int i = 0; i < ops.length; i++) {
+ CODES.put(ops[i].toString(), ops[i]);
+ }
+ }
+
+ /**
+ * Returns the prefix operator corresponding to the given string,
+ * or null if none.
+ *
+ * toOperator is the converse of toString:
+ * that is, Operator.toOperator(op.toString()) == op for
+ * all operators op.
+ *
null if none
+ */
+ public static Operator toOperator(String token) {
+ return (Operator) CODES.get(token);
+ }
+ }
+
+ /**
+ * The "operator" structural property of this node type.
+ * @since 3.0
+ */
+ public static final SimplePropertyDescriptor OPERATOR_PROPERTY =
+ new SimplePropertyDescriptor(PrefixExpression.class, "operator", PrefixExpression.Operator.class, MANDATORY); //$NON-NLS-1$
+
+ /**
+ * The "operand" structural property of this node type.
+ * @since 3.0
+ */
+ public static final ChildPropertyDescriptor OPERAND_PROPERTY =
+ new ChildPropertyDescriptor(PrefixExpression.class, "operand", Expression.class, MANDATORY, CYCLE_RISK); //$NON-NLS-1$
+
+ /**
+ * A list of property descriptors (element type:
+ * {@link StructuralPropertyDescriptor}),
+ * or null if uninitialized.
+ */
+ private static final List PROPERTY_DESCRIPTORS;
+
+ static {
+ List propertyList = new ArrayList(3);
+ createPropertyList(PrefixExpression.class, propertyList);
+ addProperty(OPERATOR_PROPERTY, propertyList);
+ addProperty(OPERAND_PROPERTY, propertyList);
+ PROPERTY_DESCRIPTORS = reapPropertyList(propertyList);
+ }
+
+ /**
+ * 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
+ * AST.JLS* constants
+
+ * @return a list of property descriptors (element type:
+ * {@link StructuralPropertyDescriptor})
+ * @since 3.0
+ */
+ public static List propertyDescriptors(int apiLevel) {
+ return PROPERTY_DESCRIPTORS;
+ }
+
+ /**
+ * The operator; defaults to an unspecified prefix operator.
+ */
+ private PrefixExpression.Operator operator =
+ PrefixExpression.Operator.PLUS;
+
+ /**
+ * The operand; lazily initialized; defaults to an unspecified,
+ * but legal, simple name.
+ */
+ private Expression operand = null;
+
+ /**
+ * Creates a new AST node for an prefix expression owned by the given
+ * AST. By default, the node has unspecified (but legal) operator and
+ * operand.
+ *
+ * @param ast the AST that is to own this node
+ */
+ PrefixExpression(AST ast) {
+ super(ast);
+ }
+
+ /* (omit javadoc for this method)
+ * Method declared on ASTNode.
+ */
+ final List internalStructuralPropertiesForType(int apiLevel) {
+ return propertyDescriptors(apiLevel);
+ }
+
+ /* (omit javadoc for this method)
+ * Method declared on ASTNode.
+ */
+ final Object internalGetSetObjectProperty(SimplePropertyDescriptor property, boolean get, Object value) {
+ if (property == OPERATOR_PROPERTY) {
+ if (get) {
+ return getOperator();
+ } else {
+ setOperator((Operator) value);
+ return null;
+ }
+ }
+ // allow default implementation to flag the error
+ return super.internalGetSetObjectProperty(property, get, value);
+ }
+
+ /* (omit javadoc for this method)
+ * Method declared on ASTNode.
+ */
+ final ASTNode internalGetSetChildProperty(ChildPropertyDescriptor property, boolean get, ASTNode child) {
+ if (property == OPERAND_PROPERTY) {
+ if (get) {
+ return getOperand();
+ } else {
+ setOperand((Expression) child);
+ return null;
+ }
+ }
+ // allow default implementation to flag the error
+ return super.internalGetSetChildProperty(property, get, child);
+ }
+
+ /* (omit javadoc for this method)
+ * Method declared on ASTNode.
+ */
+ final int getNodeType0() {
+ return PREFIX_EXPRESSION;
+ }
+
+ /* (omit javadoc for this method)
+ * Method declared on ASTNode.
+ */
+ ASTNode clone0(AST target) {
+ PrefixExpression result = new PrefixExpression(target);
+ result.setSourceRange(this.getStartPosition(), this.getLength());
+ result.setOperator(getOperator());
+ result.setOperand((Expression) getOperand().clone(target));
+ return result;
+ }
+
+ /* (omit javadoc for this method)
+ * Method declared on ASTNode.
+ */
+ final boolean subtreeMatch0(ASTMatcher matcher, Object other) {
+ // dispatch to correct overloaded match method
+ return matcher.match(this, other);
+ }
+
+ /* (omit javadoc for this method)
+ * Method declared on ASTNode.
+ */
+ void accept0(ASTVisitor visitor) {
+ boolean visitChildren = visitor.visit(this);
+ if (visitChildren) {
+ // visit children in normal left to right reading order
+ acceptChild(visitor, getOperand());
+ }
+ visitor.endVisit(this);
+ }
+
+ /**
+ * Returns the operator of this prefix expression.
+ *
+ * @return the operator
+ */
+ public PrefixExpression.Operator getOperator() {
+ return this.operator;
+ }
+
+ /**
+ * Sets the operator of this prefix expression.
+ *
+ * @param operator the operator
+ * @exception IllegalArgumentException if the argument is incorrect
+ */
+ public void setOperator(PrefixExpression.Operator operator) {
+ if (operator == null) {
+ throw new IllegalArgumentException();
+ }
+ preValueChange(OPERATOR_PROPERTY);
+ this.operator = operator;
+ postValueChange(OPERATOR_PROPERTY);
+ }
+
+ /**
+ * Returns the operand of this prefix expression.
+ *
+ * @return the operand expression node
+ */
+ public Expression getOperand() {
+ if (this.operand == null) {
+ // lazy init must be thread-safe for readers
+ synchronized (this) {
+ if (this.operand == null) {
+ preLazyInit();
+ this.operand= new SimpleName(this.ast);
+ postLazyInit(this.operand, OPERAND_PROPERTY);
+ }
+ }
+ }
+ return this.operand;
+ }
+
+ /**
+ * Sets the operand of this prefix expression.
+ *
+ * @param expression the operand expression node
+ * @exception IllegalArgumentException if:
+ *