001 /* 002 * Copyright (C) 2010 eXo Platform SAS. 003 * 004 * This is free software; you can redistribute it and/or modify it 005 * under the terms of the GNU Lesser General Public License as 006 * published by the Free Software Foundation; either version 2.1 of 007 * the License, or (at your option) any later version. 008 * 009 * This software is distributed in the hope that it will be useful, 010 * but WITHOUT ANY WARRANTY; without even the implied warranty of 011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 012 * Lesser General Public License for more details. 013 * 014 * You should have received a copy of the GNU Lesser General Public 015 * License along with this software; if not, write to the Free 016 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 017 * 02110-1301 USA, or see the FSF site: http://www.fsf.org. 018 */ 019 020 package org.crsh.shell.ui; 021 022 import org.crsh.command.InvocationContext; 023 import org.crsh.shell.io.ShellWriter; 024 import org.crsh.text.Color; 025 import org.crsh.text.Decoration; 026 import org.crsh.text.Style; 027 028 import java.io.IOException; 029 030 /** 031 * @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a> 032 * @version $Revision$ 033 */ 034 public abstract class Element { 035 036 /** . */ 037 private Decoration decoration; 038 039 /** . */ 040 private Color foreground; 041 042 /** . */ 043 private Color background; 044 045 /** . */ 046 private Element parent; 047 048 public void print(ShellWriter writer, InvocationContext context) throws IOException { 049 print(new UIWriterContext(context), writer); 050 } 051 052 public void print(UIWriterContext ctx, ShellWriter writer) throws IOException { 053 054 if (ctx == null) { 055 throw new NullPointerException(); 056 } 057 058 if (haveStyle()) { 059 new FormattingElement(Style.style(getDecoration(), getForeground(), getBackground())).print(ctx, writer); 060 } 061 062 doPrint(ctx, writer); 063 064 if (haveStyle()) { 065 new FormattingElement(Style.reset).print(ctx, writer); 066 } 067 068 } 069 070 abstract void doPrint(UIWriterContext ctx, ShellWriter writer) throws IOException; 071 072 abstract int width(); 073 074 private boolean haveStyle() { 075 return (getDecoration() != null) || (getForeground() != null) || (getBackground() != null); 076 } 077 078 public Decoration getDecoration() { 079 080 if (decoration != null) { 081 return decoration; 082 } else if (parent != null) { 083 return parent.getDecoration(); 084 } else { 085 return null; 086 } 087 088 } 089 090 public Color getForeground() { 091 092 if (foreground != null) { 093 return foreground; 094 } else if (parent != null) { 095 return parent.getForeground(); 096 } else { 097 return null; 098 } 099 100 } 101 102 public Color getBackground() { 103 104 if (background != null) { 105 return background; 106 } else if (parent != null) { 107 return parent.getBackground(); 108 } else { 109 return null; 110 } 111 112 } 113 114 public void setDecoration(Decoration decoration) { 115 this.decoration = decoration; 116 } 117 118 public void setForeground(Color foreground) { 119 this.foreground = foreground; 120 } 121 122 public void setBackground(Color background) { 123 this.background = background; 124 } 125 126 public Element getParent() { 127 return parent; 128 } 129 130 public void setParent(Element parent) { 131 this.parent = parent; 132 } 133 }