/*

 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package jdk.nashorn.internal.ir;

import jdk.nashorn.internal.ir.annotations.Immutable;

import jdk.nashorn.internal.ir.visitor.NodeVisitor;

/**

 * IR representation of a catch clause.

 */

@Immutable

    /** Exception identifier. */

    private final IdentNode exception;

    /** Exception condition. */

    private final Node exceptionCondition;

    /** Catch body. */

    private final Block body;

    /**

     * Constructors

     *

     * @param token              token

     * @param finish             finish

     * @param exception          variable name of exception

     * @param exceptionCondition exception condition

     * @param body               catch body

     */

        this.exception          = exception;

        this.exceptionCondition = exceptionCondition;

        this.body               = body;

    }

    private CatchNode(final CatchNode catchNode, final IdentNode exception, final Node exceptionCondition, final Block body) {

        super(catchNode);

        this.exception          = exception;

        this.exceptionCondition = exceptionCondition;

        this.body               = body;

    }

    /**

     * Assist in IR navigation.

     * @param visitor IR navigating visitor.

     */

    @Override

    public Node accept(final NodeVisitor visitor) {

        if (visitor.enterCatchNode(this)) {

            return visitor.leaveCatchNode(

                setException((IdentNode)exception.accept(visitor)).

                setExceptionCondition(exceptionCondition == null ? null : exceptionCondition.accept(visitor)).

                setBody((Block)body.accept(visitor)));

        }

        return this;

    }

    @Override

    public boolean isTerminal() {

        return body.isTerminal();

    }

    @Override

    public void toString(final StringBuilder sb) {

        sb.append(" catch (");

        exception.toString(sb);

        if (exceptionCondition != null) {

            sb.append(" if ");

            exceptionCondition.toString(sb);

        }

        sb.append(')');

    }

    /**

     * Get the identifier representing the exception thrown

     * @return the exception identifier

     */

    public IdentNode getException() {

        return exception;

    }

    /**

     * Get the exception condition for this catch block

     * @return the exception condition

     */

    public Node getExceptionCondition() {

        return exceptionCondition;

    }

    /**

     * Reset the exception condition for this catch block

     * @param exceptionCondition the new exception condition

     * @return new or same CatchNode

     */

    public CatchNode setExceptionCondition(final Node exceptionCondition) {

        if (this.exceptionCondition == exceptionCondition) {

            return this;

        }

        return new CatchNode(this, exception, exceptionCondition, body);

    }

    /**

     * Get the body for this catch block

     * @return the catch block body

     */

    public Block getBody() {

        return body;

    }

    /**

     * Resets the exception of a catch block

     * @param exception new exception

     * @return new catch node if changed, same otherwise

     */

    public CatchNode setException(final IdentNode exception) {

        if (this.exception == exception) {

            return this;

        }

        return new CatchNode(this, exception, exceptionCondition, body);

    }

    private CatchNode setBody(final Block body) {

        if (this.body == body) {

            return this;

        }

        return new CatchNode(this, exception, exceptionCondition, body);

    }

}