Showing the changes to java/pkg/sun/tools/jstat/HeaderClosure.java (1 of 18352 files). Show all
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| 1 | +/* | |
| 2 | + * Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package sun.tools.jstat; | |
| 27 | + | |
| 28 | +import sun.jvmstat.monitor.MonitorException; | |
| 29 | + | |
| 30 | +/** | |
| 31 | + * A class implementing the Closure interface that visits the nodes of | |
| 32 | + * the nodes of a ColumFormat object and computes the header string for | |
| 33 | + * the columns of data. | |
| 34 | + * | |
| 35 | + * @author Brian Doherty | |
| 36 | + * @since 1.5 | |
| 37 | + */ | |
| 38 | +public class HeaderClosure implements Closure { | |
| 39 | + private static final char ALIGN_CHAR = '^'; | |
| 40 | + | |
| 41 | + private StringBuilder header = new StringBuilder(); | |
| 42 | + | |
| 43 | + /* | |
| 44 | + * visit an object to perform some operation. In this case, the | |
| 45 | + * object is a ColumnFormat we are building the header string. | |
| 46 | + */ | |
| 47 | + public void visit(Object o, boolean hasNext) throws MonitorException { | |
| 48 | + | |
| 49 | + if (! (o instanceof ColumnFormat)) { | |
| 50 | + return; | |
| 51 | + } | |
| 52 | + | |
| 53 | + ColumnFormat c = (ColumnFormat)o; | |
| 54 | + | |
| 55 | + String h = c.getHeader(); | |
| 56 | + | |
| 57 | + // check for special alignment character | |
| 58 | + if (h.indexOf(ALIGN_CHAR) >= 0) { | |
| 59 | + int len = h.length(); | |
| 60 | + if ((h.charAt(0) == ALIGN_CHAR) | |
| 61 | + && (h.charAt(len-1) == ALIGN_CHAR)) { | |
| 62 | + // ^<header>^ case - center alignment | |
| 63 | + c.setWidth(Math.max(c.getWidth(), | |
| 64 | + Math.max(c.getFormat().length(), len-2))); | |
| 65 | + h = h.substring(1, len-1); | |
| 66 | + h = Alignment.CENTER.align(h, c.getWidth()); | |
| 67 | + } else if (h.charAt(0) == ALIGN_CHAR) { | |
| 68 | + // ^<header> case - left alignment | |
| 69 | + c.setWidth(Math.max(c.getWidth(), | |
| 70 | + Math.max(c.getFormat().length(), len-1))); | |
| 71 | + h = h.substring(1, len); | |
| 72 | + h = Alignment.LEFT.align(h, c.getWidth()); | |
| 73 | + } else if (h.charAt(len-1) == ALIGN_CHAR) { | |
| 74 | + // <header>^ case - right alignment | |
| 75 | + c.setWidth(Math.max(c.getWidth(), | |
| 76 | + Math.max(c.getFormat().length(), len-1))); | |
| 77 | + h = h.substring(0, len-1); | |
| 78 | + h = Alignment.RIGHT.align(h, c.getWidth()); | |
| 79 | + } else { | |
| 80 | + // an internal alignment character - ignore | |
| 81 | + } | |
| 82 | + } else { | |
| 83 | + // User has provided their own padding for alignment purposes | |
| 84 | + } | |
| 85 | + | |
| 86 | + header.append(h); | |
| 87 | + if (hasNext) { | |
| 88 | + header.append(" "); | |
| 89 | + } | |
| 90 | + } | |
| 91 | + | |
| 92 | + /* | |
| 93 | + * get the header string. | |
| 94 | + */ | |
| 95 | + public String getHeader() { | |
| 96 | + return header.toString(); | |
| 97 | + } | |
| 98 | +} | |