-/*******************************************************************************
- * Copyright (c) 2000, 2004 IBM Corporation and others.
- * All rights reserved. This program and the accompanying materials
- * are made available under the terms of the Common Public License v1.0
- * which accompanies this distribution, and is available at
- * http://www.eclipse.org/legal/cpl-v10.html
- *
- * Contributors:
- * IBM Corporation - initial API and implementation
- *******************************************************************************/
-package org.eclipse.jdt.internal.compiler.ast;
-
-import org.eclipse.jdt.internal.compiler.ASTVisitor;
-import org.eclipse.jdt.internal.compiler.impl.*;
-import org.eclipse.jdt.internal.compiler.codegen.*;
-import org.eclipse.jdt.internal.compiler.flow.*;
-import org.eclipse.jdt.internal.compiler.lookup.*;
-
-public class CaseStatement extends Statement {
-
- public Expression constantExpression;
- public CaseLabel targetLabel;
- public CaseStatement(Expression constantExpression, int sourceEnd, int sourceStart) {
- this.constantExpression = constantExpression;
- this.sourceEnd = sourceEnd;
- this.sourceStart = sourceStart;
- }
-
- public FlowInfo analyseCode(
- BlockScope currentScope,
- FlowContext flowContext,
- FlowInfo flowInfo) {
-
- if (constantExpression != null) {
- if (constantExpression.constant == NotAConstant) {
- currentScope.problemReporter().caseExpressionMustBeConstant(constantExpression);
- }
- this.constantExpression.analyseCode(currentScope, flowContext, flowInfo);
- }
- return flowInfo;
- }
-
- public StringBuffer printStatement(int tab, StringBuffer output) {
-
- printIndent(tab, output);
- if (constantExpression == null) {
- output.append("default : "); //$NON-NLS-1$
- } else {
- output.append("case "); //$NON-NLS-1$
- constantExpression.printExpression(0, output).append(" : "); //$NON-NLS-1$
- }
- return output.append(';');
- }
-
- /**
- * Case code generation
- *
- */
- public void generateCode(BlockScope currentScope, CodeStream codeStream) {
-
- if ((bits & IsReachableMASK) == 0) {
- return;
- }
- int pc = codeStream.position;
- targetLabel.place();
- codeStream.recordPositionsFrom(pc, this.sourceStart);
- }
-
- /**
- * No-op : should use resolveCase(...) instead.
- */
- public void resolve(BlockScope scope) {
- // no-op : should use resolveCase(...) instead.
- }
-
- public Constant resolveCase(
- BlockScope scope,
- TypeBinding switchType,
- SwitchStatement switchStatement) {
-
- scope.switchCase = this; // record entering in a switch case block
-
- if (constantExpression == null) {
- // remember the default case into the associated switch statement
- if (switchStatement.defaultCase != null)
- scope.problemReporter().duplicateDefaultCase(this);
-
- // on error the last default will be the selected one ...
- switchStatement.defaultCase = this;
- return null;
- }
- // add into the collection of cases of the associated switch statement
- switchStatement.cases[switchStatement.caseCount++] = this;
- TypeBinding caseType = constantExpression.resolveType(scope);
- if (caseType == null || switchType == null) return null;
- if (constantExpression.isConstantValueOfTypeAssignableToType(caseType, switchType))
- return constantExpression.constant;
- if (caseType.isCompatibleWith(switchType))
- return constantExpression.constant;
- scope.problemReporter().typeMismatchErrorActualTypeExpectedType(
- constantExpression,
- caseType,
- switchType);
- return null;
- }
-
-
- public void traverse(
- ASTVisitor visitor,
- BlockScope blockScope) {
-
- if (visitor.visit(this, blockScope)) {
- if (constantExpression != null) constantExpression.traverse(visitor, blockScope);
- }
- visitor.endVisit(this, blockScope);
- }
-}