| /* |
| * 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.classgen; |
| |
| import org.codehaus.groovy.ast.ASTNode; |
| import org.codehaus.groovy.ast.GroovyCodeVisitor; |
| import org.codehaus.groovy.ast.stmt.Statement; |
| |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Objects; |
| |
| /** |
| * This class represents a sequence of {@link BytecodeInstruction}s |
| * or {@link ASTNode}s. The evaluation is depending on the type of |
| * the visitor. |
| */ |
| public class BytecodeSequence extends Statement { |
| |
| public BytecodeSequence(final BytecodeInstruction instruction) { |
| this.instructions = Collections.singletonList(instruction); |
| } |
| |
| public BytecodeSequence(final List<?> instructions) { |
| this.instructions = Objects.requireNonNull(instructions); |
| } |
| |
| public List<?> getInstructions() { |
| return Collections.unmodifiableList(instructions); |
| } |
| |
| private final List<?> instructions; |
| |
| /** |
| * Returns the singular BytecodeInstruction. |
| * |
| * @return {@code null} if instruction(s) is not a BytecodeInstruction |
| */ |
| public BytecodeInstruction getBytecodeInstruction() { |
| if (instructions.size() == 1) { |
| Object instruction = instructions.get(0); |
| if (instruction instanceof BytecodeInstruction) { |
| return (BytecodeInstruction) instruction; |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * Delegates to the visit method used for this class. |
| * If the visitor is a ClassGenerator, then |
| * {@link ClassGenerator#visitBytecodeSequence(BytecodeSequence)} |
| * is called with this instance. If the visitor is no |
| * ClassGenerator, then this method will call visit on |
| * each ASTNode element sorted by this class. If one |
| * element is a BytecodeInstruction, then it will be skipped |
| * as it is no ASTNode. |
| * |
| * @see ClassGenerator |
| */ |
| public void visit(final GroovyCodeVisitor visitor) { |
| if (visitor instanceof ClassGenerator) { |
| ((ClassGenerator) visitor).visitBytecodeSequence(this); |
| } else { |
| for (Object instruction : instructions) { |
| if (instruction instanceof ASTNode) { |
| ((ASTNode) instruction).visit(visitor); |
| } |
| } |
| } |
| } |
| } |