1 /*
2 $Id: NodePrinter.java,v 1.3 2004/05/17 07:53:29 jstrachan Exp $
3
4 Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved.
5
6 Redistribution and use of this software and associated documentation
7 ("Software"), with or without modification, are permitted provided
8 that the following conditions are met:
9
10 1. Redistributions of source code must retain copyright
11 statements and notices. Redistributions must also contain a
12 copy of this document.
13
14 2. Redistributions in binary form must reproduce the
15 above copyright notice, this list of conditions and the
16 following disclaimer in the documentation and/or other
17 materials provided with the distribution.
18
19 3. The name "groovy" must not be used to endorse or promote
20 products derived from this Software without prior written
21 permission of The Codehaus. For written permission,
22 please contact info@codehaus.org.
23
24 4. Products derived from this Software may not be called "groovy"
25 nor may "groovy" appear in their names without prior written
26 permission of The Codehaus. "groovy" is a registered
27 trademark of The Codehaus.
28
29 5. Due credit should be given to The Codehaus -
30 http://groovy.codehaus.org/
31
32 THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS
33 ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
34 NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
35 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
36 THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
37 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
38 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
39 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
40 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
41 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
42 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
43 OF THE POSSIBILITY OF SUCH DAMAGE.
44
45 */
46 package groovy.util;
47
48
49 import org.codehaus.groovy.runtime.InvokerHelper;
50
51 import java.io.OutputStreamWriter;
52 import java.io.PrintWriter;
53 import java.util.Iterator;
54 import java.util.List;
55 import java.util.Map;
56
57 /***
58 * A helper class for creating nested trees of data
59 *
60 * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
61 * @version $Revision: 1.3 $
62 */
63 public class NodePrinter {
64
65 private IndentPrinter out;
66
67 public NodePrinter() {
68 this(new IndentPrinter(new PrintWriter(new OutputStreamWriter(System.out))));
69 }
70
71 public NodePrinter(PrintWriter out) {
72 this(new IndentPrinter(out));
73 }
74
75 public NodePrinter(IndentPrinter out) {
76 this.out = out;
77 }
78
79 public void print(Node node) {
80 out.printIndent();
81 printName(node);
82 Map attributes = node.attributes();
83 boolean hasAttributes = attributes != null && !attributes.isEmpty();
84 if (hasAttributes) {
85 printAttributes(attributes);
86 }
87 Object value = node.value();
88 if (value instanceof List) {
89 if (!hasAttributes) {
90 out.print("()");
91 }
92 printList((List) value);
93 }
94 else {
95 if (value instanceof String) {
96 out.print("('");
97 out.print((String) value);
98 out.println("')");
99 }
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 }