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 }