groovy.util.NodePrinter Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package groovy.util;
import org.codehaus.groovy.runtime.InvokerHelper;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.util.List;
import java.util.Map;
/**
* A helper class for creating nested trees of data
*
* @author James Strachan
* @author Christian Stein
*/
public class NodePrinter {
protected final IndentPrinter out;
public NodePrinter() {
this(new IndentPrinter(new PrintWriter(new OutputStreamWriter(System.out))));
}
public NodePrinter(PrintWriter out) {
this(new IndentPrinter(out));
}
public NodePrinter(IndentPrinter out) {
if (out == null) {
throw new NullPointerException("IndentPrinter 'out' must not be null!");
}
this.out = out;
}
public void print(Node node) {
out.printIndent();
printName(node);
Map attributes = node.attributes();
boolean hasAttributes = attributes != null && !attributes.isEmpty();
if (hasAttributes) {
printAttributes(attributes);
}
Object value = node.value();
if (value instanceof List) {
if (!hasAttributes) {
out.print("()");
}
printList((List) value);
} else {
if (value instanceof String) {
out.print("('");
out.print((String) value);
out.println("')");
} else {
out.println("()");
}
}
out.flush();
}
protected void printName(Node node) {
Object name = node.name();
if (name != null) {
out.print(name.toString());
} else {
out.print("null");
}
}
protected void printList(List list) {
if (list.isEmpty()) {
out.println("");
} else {
out.println(" {");
out.incrementIndent();
for (Object value : list) {
if (value instanceof Node) {
print((Node) value);
} else {
out.printIndent();
out.println(InvokerHelper.toString(value));
}
}
out.decrementIndent();
out.printIndent();
out.println("}");
}
}
protected void printAttributes(Map attributes) {
out.print("(");
boolean first = true;
for (Object o : attributes.entrySet()) {
Map.Entry entry = (Map.Entry) o;
if (first) {
first = false;
} else {
out.print(", ");
}
out.print(entry.getKey().toString());
out.print(":");
if (entry.getValue() instanceof String) {
out.print("'" + entry.getValue() + "'");
} else {
out.print(InvokerHelper.toString(entry.getValue()));
}
}
out.print(")");
}
}