001 /* 002 $Id: NodePrinter.java,v 1.3 2004/05/17 07:53:29 jstrachan Exp $ 003 004 Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved. 005 006 Redistribution and use of this software and associated documentation 007 ("Software"), with or without modification, are permitted provided 008 that the following conditions are met: 009 010 1. Redistributions of source code must retain copyright 011 statements and notices. Redistributions must also contain a 012 copy of this document. 013 014 2. Redistributions in binary form must reproduce the 015 above copyright notice, this list of conditions and the 016 following disclaimer in the documentation and/or other 017 materials provided with the distribution. 018 019 3. The name "groovy" must not be used to endorse or promote 020 products derived from this Software without prior written 021 permission of The Codehaus. For written permission, 022 please contact info@codehaus.org. 023 024 4. Products derived from this Software may not be called "groovy" 025 nor may "groovy" appear in their names without prior written 026 permission of The Codehaus. "groovy" is a registered 027 trademark of The Codehaus. 028 029 5. Due credit should be given to The Codehaus - 030 http://groovy.codehaus.org/ 031 032 THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS 033 ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT 034 NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 035 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 036 THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 037 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 038 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 039 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 040 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 041 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 042 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 043 OF THE POSSIBILITY OF SUCH DAMAGE. 044 045 */ 046 package groovy.util; 047 048 049 import org.codehaus.groovy.runtime.InvokerHelper; 050 051 import java.io.OutputStreamWriter; 052 import java.io.PrintWriter; 053 import java.util.Iterator; 054 import java.util.List; 055 import java.util.Map; 056 057 /** 058 * A helper class for creating nested trees of data 059 * 060 * @author <a href="mailto:james@coredevelopers.net">James Strachan</a> 061 * @version $Revision: 1.3 $ 062 */ 063 public class NodePrinter { 064 065 private IndentPrinter out; 066 067 public NodePrinter() { 068 this(new IndentPrinter(new PrintWriter(new OutputStreamWriter(System.out)))); 069 } 070 071 public NodePrinter(PrintWriter out) { 072 this(new IndentPrinter(out)); 073 } 074 075 public NodePrinter(IndentPrinter out) { 076 this.out = out; 077 } 078 079 public void print(Node node) { 080 out.printIndent(); 081 printName(node); 082 Map attributes = node.attributes(); 083 boolean hasAttributes = attributes != null && !attributes.isEmpty(); 084 if (hasAttributes) { 085 printAttributes(attributes); 086 } 087 Object value = node.value(); 088 if (value instanceof List) { 089 if (!hasAttributes) { 090 out.print("()"); 091 } 092 printList((List) value); 093 } 094 else { 095 if (value instanceof String) { 096 out.print("('"); 097 out.print((String) value); 098 out.println("')"); 099 } 100 else { 101 out.println("()"); 102 } 103 } 104 out.flush(); 105 } 106 107 protected void printName(Node node) { 108 Object name = node.name(); 109 if (name != null) { 110 out.print(name.toString()); 111 } 112 else { 113 out.print("null"); 114 } 115 } 116 117 protected void printList(List list) { 118 if (list.isEmpty()) { 119 out.println(""); 120 } 121 else { 122 out.println(" {"); 123 out.incrementIndent(); 124 for (Iterator iter = list.iterator(); iter.hasNext();) { 125 Object value = iter.next(); 126 if (value instanceof Node) { 127 print((Node) value); 128 } 129 else { 130 out.printIndent(); 131 out.print("builder.append("); 132 out.print(InvokerHelper.toString(value)); 133 out.println(")"); 134 } 135 } 136 out.decrementIndent(); 137 out.printIndent(); 138 out.println("}"); 139 } 140 } 141 142 143 protected void printAttributes(Map attributes) { 144 out.print("("); 145 boolean first = true; 146 for (Iterator iter = attributes.entrySet().iterator(); iter.hasNext();) { 147 Map.Entry entry = (Map.Entry) iter.next(); 148 if (first) { 149 first = false; 150 } 151 else { 152 out.print(", "); 153 } 154 out.print(entry.getKey().toString()); 155 out.print(":"); 156 if (entry.getValue() instanceof String) { 157 out.print("'" + entry.getValue() + "'"); 158 } 159 else { 160 out.print(InvokerHelper.toString(entry.getValue())); 161 } 162 } 163 out.print(")"); 164 } 165 166 }