| /******************************************************************************* |
| * Copyright (c) 2015 Ericsson |
| * |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| *******************************************************************************/ |
| package org.eclipse.tracecompass.internal.ctf.core.event.metadata.tsdl.stream; |
| |
| import static org.eclipse.tracecompass.internal.ctf.core.event.metadata.tsdl.TsdlUtils.isUnaryInteger; |
| |
| import org.antlr.runtime.tree.CommonTree; |
| import org.eclipse.tracecompass.internal.ctf.core.event.metadata.ICommonTreeParser; |
| import org.eclipse.tracecompass.internal.ctf.core.event.metadata.ParseException; |
| import org.eclipse.tracecompass.internal.ctf.core.event.metadata.tsdl.UnaryIntegerParser; |
| |
| /** |
| * <strong>Stream ID</strong>, used as reference to stream description in |
| * metadata. This field is optional if there is only one stream description in |
| * the metadata, but becomes required if there are more than one stream in the |
| * TSDL metadata description. |
| * |
| * @author Matthew Khouzam |
| * @author Efficios - Javadoc |
| * |
| */ |
| public final class StreamIdParser implements ICommonTreeParser { |
| |
| /** Instance */ |
| public static final StreamIdParser INSTANCE = new StreamIdParser(); |
| |
| private StreamIdParser() { |
| } |
| |
| /** |
| * Parses a stream id |
| * |
| * @param tree |
| * the AST node with "id = N;" |
| * @return the value of the stream as a {@link Long} |
| */ |
| @Override |
| public Long parse(CommonTree tree, ICommonTreeParserParameter param) throws ParseException { |
| CommonTree firstChild = (CommonTree) tree.getChild(0); |
| if (isUnaryInteger(firstChild)) { |
| if (tree.getChildCount() > 1) { |
| throw new ParseException("invalid value for stream id"); //$NON-NLS-1$ |
| } |
| long intval = UnaryIntegerParser.INSTANCE.parse(firstChild, null); |
| return intval; |
| } |
| throw new ParseException("invalid value for stream id"); //$NON-NLS-1$ |
| } |
| |
| } |