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/*
 * 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 com.hazelcast.org.apache.calcite.linq4j.tree;

import static java.util.Objects.requireNonNull;

/**
 * 

Helper methods concerning {@link BlockStatement}s.

* * @see BlockBuilder */ public final class Blocks { private Blocks() { throw new AssertionError("no blocks for you!"); } private static BlockStatement toFunctionBlock(Node body, boolean function) { if (body instanceof BlockStatement) { return (BlockStatement) body; } Statement statement; if (body instanceof Statement) { statement = (Statement) body; } else if (body instanceof Expression) { if (((Expression) body).getType() == Void.TYPE && function) { statement = Expressions.statement((Expression) body); } else { statement = Expressions.return_(null, (Expression) body); } } else { throw new AssertionError("block cannot contain node that is neither " + "statement nor expression: " + body); } return Expressions.block(statement); } public static BlockStatement toFunctionBlock(Node body) { return toFunctionBlock(body, true); } public static BlockStatement toBlock(Node body) { return toFunctionBlock(body, false); } /** * Prepends a statement to a block. */ public static BlockStatement create(Statement statement, BlockStatement block) { return Expressions.block( Expressions.list(statement).appendAll(block.statements)); } /** * Converts a simple "{ return expr; }" block into "expr"; otherwise * throws. */ public static Expression simple(BlockStatement block) { if (block.statements.size() == 1) { Statement statement = block.statements.get(0); if (statement instanceof GotoStatement) { return requireNonNull(((GotoStatement) statement).expression); } } throw new AssertionError("not a simple block: " + block); } }




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