1 /*
2 $Id: NodePrinter.java,v 1.4 2005/06/18 07:49:15 cstein 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 * @author Christian Stein
62 * @version $Revision: 1.4 $
63 */
64 public class NodePrinter {
65
66 protected final IndentPrinter out;
67
68 public NodePrinter() {
69 this(new IndentPrinter(new PrintWriter(new OutputStreamWriter(System.out))));
70 }
71
72 public NodePrinter(PrintWriter out) {
73 this(new IndentPrinter(out));
74 }
75
76 public NodePrinter(IndentPrinter out) {
77 if (out == null) {
78 throw new NullPointerException("IndentPrinter 'out' must not be null!");
79 }
80 this.out = out;
81 }
82
83 public void print(Node node) {
84 out.printIndent();
85 printName(node);
86 Map attributes = node.attributes();
87 boolean hasAttributes = attributes != null && !attributes.isEmpty();
88 if (hasAttributes) {
89 printAttributes(attributes);
90 }
91 Object value = node.value();
92 if (value instanceof List) {
93 if (!hasAttributes) {
94 out.print("()");
95 }
96 printList((List) value);
97 }
98 else {
99 if (value instanceof String) {
100 out.print("('");
101 out.print((String) value);
102 out.println("')");
103 }
104 else {
105 out.println("()");
106 }
107 }
108 out.flush();
109 }
110
111 protected void printName(Node node) {
112 Object name = node.name();
113 if (name != null) {
114 out.print(name.toString());
115 }
116 else {
117 out.print("null");
118 }
119 }
120
121 protected void printList(List list) {
122 if (list.isEmpty()) {
123 out.println("");
124 }
125 else {
126 out.println(" {");
127 out.incrementIndent();
128 for (Iterator iter = list.iterator(); iter.hasNext();) {
129 Object value = iter.next();
130 if (value instanceof Node) {
131 print((Node) value);
132 }
133 else {
134 out.printIndent();
135 out.print("builder.append(");
136 out.print(InvokerHelper.toString(value));
137 out.println(")");
138 }
139 }
140 out.decrementIndent();
141 out.printIndent();
142 out.println("}");
143 }
144 }
145
146
147 protected void printAttributes(Map attributes) {
148 out.print("(");
149 boolean first = true;
150 for (Iterator iter = attributes.entrySet().iterator(); iter.hasNext();) {
151 Map.Entry entry = (Map.Entry) iter.next();
152 if (first) {
153 first = false;
154 }
155 else {
156 out.print(", ");
157 }
158 out.print(entry.getKey().toString());
159 out.print(":");
160 if (entry.getValue() instanceof String) {
161 out.print("'" + entry.getValue() + "'");
162 }
163 else {
164 out.print(InvokerHelper.toString(entry.getValue()));
165 }
166 }
167 out.print(")");
168 }
169
170 }