LabelFlowContext.java

/*******************************************************************************
 * Copyright (c) 2000, 2009 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.compiler.flow;

import org.eclipse.jdt.core.compiler.CharOperation;
import org.eclipse.jdt.internal.compiler.ast.ASTNode;
import org.eclipse.jdt.internal.compiler.codegen.BranchLabel;
import org.eclipse.jdt.internal.compiler.lookup.BlockScope;

/**
 * Reflects the context of code analysis, keeping track of enclosing try statements, exception
 * handlers, etc...
 */
public class LabelFlowContext extends SwitchFlowContext {

	public char[] labelName;

	public LabelFlowContext(FlowContext parent, ASTNode associatedNode, char[] labelName, BranchLabel breakLabel, BlockScope scope) {
		super(parent, associatedNode, breakLabel);
		this.labelName= labelName;
		checkLabelValidity(scope);
	}

	void checkLabelValidity(BlockScope scope) {
		// check if label was already defined above
		FlowContext current= this.parent;
		while (current != null) {
			char[] currentLabelName;
			if (((currentLabelName= current.labelName()) != null)
					&& CharOperation.equals(currentLabelName, this.labelName)) {
				scope.problemReporter().alreadyDefinedLabel(this.labelName, this.associatedNode);
			}
			current= current.parent;
		}
	}

	public String individualToString() {
		return "Label flow context [label:" + String.valueOf(this.labelName) + "]"; //$NON-NLS-2$ //$NON-NLS-1$
	}

	public char[] labelName() {
		return this.labelName;
	}
}