| /******************************************************************************* |
| * 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.apache.sling.scripting.sightly.impl.compiler; |
| |
| import java.util.LinkedList; |
| import java.util.List; |
| |
| import org.apache.sling.scripting.sightly.compiler.commands.Command; |
| import org.apache.sling.scripting.sightly.compiler.commands.CommandHandler; |
| import org.apache.sling.scripting.sightly.compiler.commands.CommandStream; |
| import org.apache.sling.scripting.sightly.impl.compiler.util.stream.BroadcastHandler; |
| |
| /** |
| * A stream that can be written into. |
| */ |
| public final class PushStream implements CommandStream { |
| |
| private BroadcastHandler handler = new BroadcastHandler(); |
| private boolean closed; |
| private List<Command> commands = new LinkedList<>(); |
| private List<StreamMessage> warnings = new LinkedList<>(); |
| |
| @Override |
| public void addHandler(CommandHandler handler) { |
| this.handler.addHandler(handler); |
| } |
| |
| @Override |
| public List<Command> getCommands() { |
| return commands; |
| } |
| |
| public List<StreamMessage> getWarnings() { |
| return warnings; |
| } |
| |
| public void write(Command command) { |
| if (closed) { |
| throw new UnsupportedOperationException("Stream is closed"); |
| } |
| commands.add(command); |
| this.handler.onEmit(command); |
| } |
| |
| /** |
| * Signal an error to the attached {@link CommandHandler}. |
| * |
| * @param message the error message |
| * @throws UnsupportedOperationException if the stream has been closed |
| */ |
| public void signalError(String message) { |
| if (closed) { |
| throw new UnsupportedOperationException("Stream has already been closed."); |
| } |
| closed = true; |
| this.handler.onError(message); |
| } |
| |
| /** |
| * Closes this stream. Once the stream has been closed no other methods can be called on the stream any more. |
| * |
| * @throws UnsupportedOperationException if the stream has already been closed |
| */ |
| public void close() { |
| if (closed) { |
| throw new UnsupportedOperationException("Stream has already been closed."); |
| } |
| closed = true; |
| this.handler.onDone(); |
| } |
| |
| public void warn(StreamMessage warning) { |
| warnings.add(warning); |
| } |
| |
| public static class StreamMessage { |
| private String message; |
| private String code; |
| |
| public StreamMessage(String message, String code) { |
| this.message = message; |
| this.code = code; |
| } |
| |
| public String getMessage() { |
| return message; |
| } |
| |
| public String getCode() { |
| return code; |
| } |
| } |
| } |