| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.codehaus.groovy.ast.stmt; |
| |
| import org.codehaus.groovy.ast.ASTNode; |
| import org.codehaus.groovy.ast.GroovyCodeVisitor; |
| |
| import java.util.Collections; |
| import java.util.Map; |
| |
| public class EmptyStatement extends Statement { |
| |
| /** |
| * @see EmptyStatement#INSTANCE |
| */ |
| public EmptyStatement() {} |
| |
| protected EmptyStatement(Map<?, ?> metaDataMap) { |
| super.setMetaDataMap(metaDataMap); |
| } |
| |
| @Override |
| public boolean isEmpty() { |
| return true; |
| } |
| |
| @Override |
| public void visit(GroovyCodeVisitor visitor) { |
| visitor.visitEmptyStatement(this); |
| } |
| |
| //-------------------------------------------------------------------------- |
| |
| /** |
| * Immutable singleton that is recommended for use when source range or any |
| * other occurrence-specific metadata is not needed. |
| */ |
| public static final EmptyStatement INSTANCE = new EmptyStatement(Collections.EMPTY_MAP) { |
| |
| private void throwUnsupportedOperationException() { |
| throw new UnsupportedOperationException("EmptyStatement.INSTANCE is immutable"); |
| } |
| |
| // ASTNode overrides: |
| |
| @Override |
| public void setColumnNumber(int n) { |
| throwUnsupportedOperationException(); |
| } |
| |
| @Override |
| public void setLastColumnNumber(int n) { |
| throwUnsupportedOperationException(); |
| } |
| |
| @Override |
| public void setLastLineNumber(int n) { |
| throwUnsupportedOperationException(); |
| } |
| |
| @Override |
| public void setLineNumber(int n) { |
| throwUnsupportedOperationException(); |
| } |
| |
| @Override |
| public void setMetaDataMap(Map<?, ?> meta) { |
| throwUnsupportedOperationException(); |
| } |
| |
| @Override |
| public void setSourcePosition(ASTNode node) { |
| throwUnsupportedOperationException(); |
| } |
| |
| // Statement overrides: |
| |
| @Override |
| public void addStatementLabel(String label) { |
| throwUnsupportedOperationException(); |
| } |
| |
| @Override |
| public void setStatementLabel(String label) { |
| throwUnsupportedOperationException(); |
| } |
| }; |
| } |