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;

Catch clause AST node type.
CatchClause:
   catch ( FormalParameter ) Block

The FormalParameter is represented by a SingleVariableDeclaration.
Since:
2.0
@noinstantiate
This class is not intended to be instantiated by clients./**
 * Catch clause AST node type.
 *
 * <pre>
 * CatchClause:
 *    <b>catch</b> <b>(</b> FormalParameter <b>)</b> Block
 * </pre>
 *
 * <p>The FormalParameter is represented by a {@link SingleVariableDeclaration}.</p>
 * @since 2.0
 * @noinstantiate This class is not intended to be instantiated by clients.
 */
@SuppressWarnings("rawtypes")
public class CatchClause extends ASTNode {

	
The "exception" structural property of this node type (child type: SingleVariableDeclaration). 
Since:
3.0/**
	 * The "exception" structural property of this node type (child type: {@link SingleVariableDeclaration}).
	 * @since 3.0
	 */
	public static final ChildPropertyDescriptor EXCEPTION_PROPERTY =
		new ChildPropertyDescriptor(CatchClause.class, "exception", SingleVariableDeclaration.class, MANDATORY, CYCLE_RISK); //$NON-NLS-1$

	
The "body" structural property of this node type (child type: Block). 
Since:
3.0/**
	 * The "body" structural property of this node type (child type: {@link Block}).
	 * @since 3.0
	 */
	public static final ChildPropertyDescriptor BODY_PROPERTY =
		new ChildPropertyDescriptor(CatchClause.class, "body", Block.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(3);
		createPropertyList(CatchClause.class, properyList);
		addProperty(EXCEPTION_PROPERTY, properyList);
		addProperty(BODY_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 body; lazily initialized; defaults to an empty block.
/**
	 * The body; lazily initialized; defaults to an empty block.
	 */
	private Block body = null;

	
The exception variable declaration; lazily initialized; defaults to a
unspecified, but legal, variable declaration.
/**
	 * The exception variable declaration; lazily initialized; defaults to a
	 * unspecified, but legal, variable declaration.
	 */
	private SingleVariableDeclaration exceptionDecl = null;

	
Creates a new AST node for a catch clause owned by the given
AST. By default, the catch clause declares an unspecified, but legal,
exception declaration and has an empty block.

N.B. This constructor is package-private.

Params:
ast – the AST that is to own this node/**
	 * Creates a new AST node for a catch clause owned by the given
	 * AST. By default, the catch clause declares an unspecified, but legal,
	 * exception declaration and has an empty block.
	 * <p>
	 * N.B. This constructor is package-private.
	 * </p>
	 *
	 * @param ast the AST that is to own this node
	 */
	CatchClause(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 == EXCEPTION_PROPERTY) {
			if (get) {
				return getException();
			} else {
				setException((SingleVariableDeclaration) child);
				return null;
			}
		}
		if (property == BODY_PROPERTY) {
			if (get) {
				return getBody();
			} else {
				setBody((Block) child);
				return null;
			}
		}
		// allow default implementation to flag the error
		return super.internalGetSetChildProperty(property, get, child);
	}

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

	@Override
	ASTNode clone0(AST target) {
		CatchClause result = new CatchClause(target);
		result.setSourceRange(getStartPosition(), getLength());
		result.setBody((Block) getBody().clone(target));
		result.setException(
			(SingleVariableDeclaration) ASTNode.copySubtree(target, getException()));
		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, getException());
			acceptChild(visitor, getBody());
		}
		visitor.endVisit(this);
	}

	
Returns the exception variable declaration of this catch clause.
Returns:
the exception variable declaration node/**
	 * Returns the exception variable declaration of this catch clause.
	 *
	 * @return the exception variable declaration node
	 */
	public SingleVariableDeclaration getException() {
		if (this.exceptionDecl == null) {
			// lazy init must be thread-safe for readers
			synchronized (this) {
				if (this.exceptionDecl == null) {
					preLazyInit();
					this.exceptionDecl = new SingleVariableDeclaration(this.ast);
					postLazyInit(this.exceptionDecl, EXCEPTION_PROPERTY);
				}
			}
		}
		return this.exceptionDecl;
	}

	
Sets the variable declaration of this catch clause.
Params:
exception – the exception variable declaration 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 variable declaration of this catch clause.
	 *
	 * @param exception the exception variable declaration 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 setException(SingleVariableDeclaration exception) {
		if (exception == null) {
			throw new IllegalArgumentException();
		}
		ASTNode oldChild = this.exceptionDecl;
		preReplaceChild(oldChild, exception, EXCEPTION_PROPERTY);
		this.exceptionDecl= exception;
		postReplaceChild(oldChild, exception, EXCEPTION_PROPERTY);
	}

	
Returns the body of this catch clause.
Returns:
the catch clause body/**
	 * Returns the body of this catch clause.
	 *
	 * @return the catch clause body
	 */
	public Block getBody() {
		if (this.body == null) {
			// lazy init must be thread-safe for readers
			synchronized (this) {
				if (this.body == null) {
					preLazyInit();
					this.body = new Block(this.ast);
					postLazyInit(this.body, BODY_PROPERTY);
				}
			}
		}
		return this.body;
	}

	
Sets the body of this catch clause.
Params:
body – the catch clause block 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 body of this catch clause.
	 *
	 * @param body the catch clause block 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 setBody(Block body) {
		if (body == null) {
			throw new IllegalArgumentException();
		}
		ASTNode oldChild = this.body;
		preReplaceChild(oldChild, body, BODY_PROPERTY);
		this.body = body;
		postReplaceChild(oldChild, body, BODY_PROPERTY);
	}

	@Override
	int memSize() {
		// treat Code as free
		return BASE_NODE_SIZE + 2 * 4;
	}

	@Override
	int treeSize() {
		return
			memSize()
			+ (this.exceptionDecl == null ? 0 : getException().treeSize())
			+ (this.body == null ? 0 : getBody().treeSize());
	}
}