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    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 }