Copyright (c) 2004, 2019 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) 2004, 2019 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;

Single member annotation node (added in JLS3 API). The single member annotation
"@foo(bar)" is equivalent to the normal annotation "@foo(value=bar)".
SingleMemberAnnotation:
  @ TypeName ( Expression  )


Within annotations, only certain kinds of expressions are meaningful,
including other annotations.

Since:
3.1
@noinstantiate
This class is not intended to be instantiated by clients./**
 * Single member annotation node (added in JLS3 API). The single member annotation
 * "@foo(bar)" is equivalent to the normal annotation "@foo(value=bar)".
 * <pre>
 * SingleMemberAnnotation:
 *   <b>@</b> TypeName <b>(</b> Expression  <b>)</b>
 * </pre>
 * <p>
 * Within annotations, only certain kinds of expressions are meaningful,
 * including other annotations.
 * </p>
 *
 * @since 3.1
 * @noinstantiate This class is not intended to be instantiated by clients.
 */
@SuppressWarnings("rawtypes")
public final class SingleMemberAnnotation extends Annotation {

	
The "typeName" structural property of this node type (child type: Name). /**
	 * The "typeName" structural property of this node type (child type: {@link Name}).
	 */
	public static final ChildPropertyDescriptor TYPE_NAME_PROPERTY =
		internalTypeNamePropertyFactory(SingleMemberAnnotation.class);

	
The "value" structural property of this node type (child type: Expression). /**
	 * The "value" structural property of this node type (child type: {@link Expression}).
	 */
	public static final ChildPropertyDescriptor VALUE_PROPERTY =
		new ChildPropertyDescriptor(SingleMemberAnnotation.class, "value", 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 propertyList = new ArrayList(3);
		createPropertyList(SingleMemberAnnotation.class, propertyList);
		addProperty(TYPE_NAME_PROPERTY, propertyList);
		addProperty(VALUE_PROPERTY, propertyList);
		PROPERTY_DESCRIPTORS = reapPropertyList(propertyList);
	}

	
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)/**
	 * 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})
	 */
	public static List propertyDescriptors(int apiLevel) {
		return PROPERTY_DESCRIPTORS;
	}

	
The value; lazily initialized; defaults to a unspecified, but legal,
expression.
/**
	 * The value; lazily initialized; defaults to a unspecified, but legal,
	 * expression.
	 */
	private Expression value = null;

	
Creates a new unparented normal annotation node owned
by the given AST.  By default, the annotation has an
unspecified type name and an unspecified value.

N.B. This constructor is package-private.

Params:
ast – the AST that is to own this node/**
	 * Creates a new unparented normal annotation node owned
	 * by the given AST.  By default, the annotation has an
	 * unspecified type name and an unspecified value.
	 * <p>
	 * N.B. This constructor is package-private.
	 * </p>
	 *
	 * @param ast the AST that is to own this node
	 */
	SingleMemberAnnotation(AST ast) {
		super(ast);
	    unsupportedIn2();
	}

	@Override
	final List internalStructuralPropertiesForType(int apiLevel) {
		return propertyDescriptors(apiLevel);
	}

	@Override
	final ASTNode internalGetSetChildProperty(ChildPropertyDescriptor property, boolean get, ASTNode child) {
		if (property == TYPE_NAME_PROPERTY) {
			if (get) {
				return getTypeName();
			} else {
				setTypeName((Name) child);
				return null;
			}
		}
		if (property == VALUE_PROPERTY) {
			if (get) {
				return getValue();
			} else {
				setValue((Expression) child);
				return null;
			}
		}
		// allow default implementation to flag the error
		return super.internalGetSetChildProperty(property, get, child);
	}

	@Override
	final ChildPropertyDescriptor internalTypeNameProperty() {
		return TYPE_NAME_PROPERTY;
	}

	@Override
	final int getNodeType0() {
		return SINGLE_MEMBER_ANNOTATION;
	}

	@Override
	ASTNode clone0(AST target) {
		SingleMemberAnnotation result = new SingleMemberAnnotation(target);
		result.setSourceRange(getStartPosition(), getLength());
		result.setTypeName((Name) ASTNode.copySubtree(target, getTypeName()));
		result.setValue((Expression) ASTNode.copySubtree(target, getValue()));
		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) {
			// visit children in normal left to right reading order
			acceptChild(visitor, getTypeName());
			acceptChild(visitor, getValue());
		}
		visitor.endVisit(this);
	}

	
Returns the value of this annotation.
Returns:
the value node/**
	 * Returns the value of this annotation.
	 *
	 * @return the value node
	 */
	public Expression getValue() {
		if (this.value == null) {
			// lazy init must be thread-safe for readers
			synchronized (this) {
				if (this.value == null) {
					preLazyInit();
					this.value = new SimpleName(this.ast);
					postLazyInit(this.value, VALUE_PROPERTY);
				}
			}
		}
		return this.value;
	}

	
Sets the value of this annotation.
Params:
value – the new value
Throws:
IllegalArgumentException – if:

the node belongs to a different AST
the node already has a parent
a cycle in would be created
/**
	 * Sets the value of this annotation.
	 *
	 * @param value the new value
	 * @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 setValue(Expression value) {
		if (value == null) {
			throw new IllegalArgumentException();
		}
		ASTNode oldChild = this.value;
		preReplaceChild(oldChild, value, VALUE_PROPERTY);
		this.value = value;
		postReplaceChild(oldChild, value, VALUE_PROPERTY);
	}

	@Override
	int memSize() {
		return super.memSize() + 1 * 4;
	}

	@Override
	int treeSize() {
		return
			memSize()
			+ (this.typeName == null ? 0 : getTypeName().treeSize())
			+ (this.value == null ? 0 : getValue().treeSize());
	}
}