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/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

package org.mozilla.javascript.ast;

import org.mozilla.javascript.Token;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 * Try/catch/finally statement.  Node type is {@link Token#TRY}.

* *

TryStatement :
 *        try Block Catch
 *        try Block Finally
 *        try Block Catch Finally
 * Catch :
 *        catch ( Identifier ) Block
 * Finally :
 *        finally Block
*/ public class TryStatement extends AstNode { private static final List NO_CATCHES = Collections.unmodifiableList(new ArrayList()); private AstNode tryBlock; private List catchClauses; private AstNode finallyBlock; private int finallyPosition = -1; { type = Token.TRY; } public TryStatement() { } public TryStatement(int pos) { super(pos); } public TryStatement(int pos, int len) { super(pos, len); } public AstNode getTryBlock() { return tryBlock; } /** * Sets try block. Also sets its parent to this node. * @throws IllegalArgumentException} if {@code tryBlock} is {@code null} */ public void setTryBlock(AstNode tryBlock) { assertNotNull(tryBlock); this.tryBlock = tryBlock; tryBlock.setParent(this); } /** * Returns list of {@link CatchClause} nodes. If there are no catch * clauses, returns an immutable empty list. */ public List getCatchClauses() { return catchClauses != null ? catchClauses : NO_CATCHES; } /** * Sets list of {@link CatchClause} nodes. Also sets their parents * to this node. May be {@code null}. Replaces any existing catch * clauses for this node. */ public void setCatchClauses(List catchClauses) { if (catchClauses == null) { this.catchClauses = null; } else { if (this.catchClauses != null) this.catchClauses.clear(); for (CatchClause cc : catchClauses) { addCatchClause(cc); } } } /** * Add a catch-clause to the end of the list, and sets its parent to * this node. * @throws IllegalArgumentException} if {@code clause} is {@code null} */ public void addCatchClause(CatchClause clause) { assertNotNull(clause); if (catchClauses == null) { catchClauses = new ArrayList(); } catchClauses.add(clause); clause.setParent(this); } /** * Returns finally block, or {@code null} if not present */ public AstNode getFinallyBlock() { return finallyBlock; } /** * Sets finally block, and sets its parent to this node. * May be {@code null}. */ public void setFinallyBlock(AstNode finallyBlock) { this.finallyBlock = finallyBlock; if (finallyBlock != null) finallyBlock.setParent(this); } /** * Returns position of {@code finally} keyword, if present, or -1 */ public int getFinallyPosition() { return finallyPosition; } /** * Sets position of {@code finally} keyword, if present, or -1 */ public void setFinallyPosition(int finallyPosition) { this.finallyPosition = finallyPosition; } @Override public String toSource(int depth) { StringBuilder sb = new StringBuilder(250); sb.append(makeIndent(depth)); sb.append("try "); sb.append(tryBlock.toSource(depth).trim()); for (CatchClause cc : getCatchClauses()) { sb.append(cc.toSource(depth)); } if (finallyBlock != null) { sb.append(" finally "); sb.append(finallyBlock.toSource(depth)); } return sb.toString(); } /** * Visits this node, then the try-block, then any catch clauses, * and then any finally block. */ @Override public void visit(NodeVisitor v) { if (v.visit(this)) { tryBlock.visit(v); for (CatchClause cc : getCatchClauses()) { cc.visit(v); } if (finallyBlock != null) { finallyBlock.visit(v); } } } }




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