| /* |
| * Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.tools.jstat; |
| |
| import sun.jvmstat.monitor.MonitorException; |
| |
| /** |
| * A class implementing the Closure interface that visits the nodes of |
| * the nodes of a ColumFormat object and computes the header string for |
| * the columns of data. |
| * |
| * @author Brian Doherty |
| * @since 1.5 |
| */ |
| public class HeaderClosure implements Closure { |
| private static final char ALIGN_CHAR = '^'; |
| |
| private StringBuilder header = new StringBuilder(); |
| |
| /* |
| * visit an object to perform some operation. In this case, the |
| * object is a ColumnFormat we are building the header string. |
| */ |
| public void visit(Object o, boolean hasNext) throws MonitorException { |
| |
| if (! (o instanceof ColumnFormat)) { |
| return; |
| } |
| |
| ColumnFormat c = (ColumnFormat)o; |
| |
| String h = c.getHeader(); |
| |
| // check for special alignment character |
| if (h.indexOf(ALIGN_CHAR) >= 0) { |
| int len = h.length(); |
| if ((h.charAt(0) == ALIGN_CHAR) |
| && (h.charAt(len-1) == ALIGN_CHAR)) { |
| // ^<header>^ case - center alignment |
| c.setWidth(Math.max(c.getWidth(), |
| Math.max(c.getFormat().length(), len-2))); |
| h = h.substring(1, len-1); |
| h = Alignment.CENTER.align(h, c.getWidth()); |
| } else if (h.charAt(0) == ALIGN_CHAR) { |
| // ^<header> case - left alignment |
| c.setWidth(Math.max(c.getWidth(), |
| Math.max(c.getFormat().length(), len-1))); |
| h = h.substring(1, len); |
| h = Alignment.LEFT.align(h, c.getWidth()); |
| } else if (h.charAt(len-1) == ALIGN_CHAR) { |
| // <header>^ case - right alignment |
| c.setWidth(Math.max(c.getWidth(), |
| Math.max(c.getFormat().length(), len-1))); |
| h = h.substring(0, len-1); |
| h = Alignment.RIGHT.align(h, c.getWidth()); |
| } else { |
| // an internal alignment character - ignore |
| } |
| } else { |
| // User has provided their own padding for alignment purposes |
| } |
| |
| header.append(h); |
| if (hasNext) { |
| header.append(" "); |
| } |
| } |
| |
| /* |
| * get the header string. |
| */ |
| public String getHeader() { |
| return header.toString(); |
| } |
| } |