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Groovy: A powerful, dynamic language for the JVM
/*
* Copyright 2003-2007 the original author or authors.
*
* Licensed 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 groovy.xml.QName;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.codehaus.groovy.runtime.InvokerHelper;
/**
* Prints a node with all children in XML format.
*
* @author Christian Stein
* @see groovy.util.NodePrinter
*/
public class XmlNodePrinter {
protected final IndentPrinter out;
private String quote;
private boolean namespaceAware = true;
public XmlNodePrinter(PrintWriter out) {
this(out, " ");
}
public XmlNodePrinter(PrintWriter out, String indent) {
this(out, indent, "\"");
}
public XmlNodePrinter(PrintWriter out, String indent, String quote) {
this(new IndentPrinter(out, indent), quote);
}
public XmlNodePrinter(IndentPrinter out, String quote) {
if (out == null) {
throw new IllegalArgumentException("Argument 'IndentPrinter out' must not be null!");
}
this.out = out;
this.quote = quote;
}
public XmlNodePrinter() {
this(new PrintWriter(new OutputStreamWriter(System.out)));
}
public String getNameOfNode(Node node) {
if (node == null) {
throw new IllegalArgumentException("Node must not be null!");
}
Object name = node.name();
if (name instanceof QName) {
QName qname = (QName) name;
if (!namespaceAware) {
return qname.getLocalPart();
}
return qname.getQualifiedName();
}
return name.toString();
}
public boolean isEmptyElement(Node node) {
if (node == null) {
throw new IllegalArgumentException("Node must not be null!");
}
if (!node.children().isEmpty()) {
return false;
}
return node.text().length() == 0;
}
public void print(Node node) {
print(node, new NamespaceContext());
}
/**
* Check if namespace handling is enabled.
*
* @return true if namespace handling is enabled
*/
public boolean isNamespaceAware() {
return namespaceAware;
}
/**
* Enable and/or disable namespace handling.
*
* @param namespaceAware the new desired value
*/
public void setNamespaceAware(boolean namespaceAware) {
this.namespaceAware = namespaceAware;
}
/**
* Get Quote to use when printing attributes.
*
* @return the quote character
*/
public String getQuote() {
return quote;
}
/**
* Set Quote to use when printing attributes.
*
* @param quote the quote character
*/
public void setQuote(String quote) {
this.quote = quote;
}
protected void print(Node node, NamespaceContext ctx) {
/*
* Handle empty elements like '
', '![]()
or '
.
*/
if (isEmptyElement(node)) {
printLineBegin();
out.print("<");
out.print(getNameOfNode(node));
if (ctx != null) {
printNamespace(node, ctx);
}
printNameAttributes(node.attributes());
out.print("/>");
printLineEnd(); // "node named '" + node.name() + "'"
out.flush();
return;
}
/*
* Hook for extra processing, e.g. GSP tag element!
*/
if (printSpecialNode(node)) {
out.flush();
return;
}
/*
* Handle normal element like ... .
*/
Object value = node.value();
if (value instanceof List) {
printName(node, ctx, true);
printList((List) value, ctx);
printName(node, ctx, false);
out.flush();
return;
}
// treat as simple type - probably a String
printName(node, ctx, true);
printSimpleItemWithIndent(value);
printName(node, ctx, false);
out.flush();
}
protected void printLineBegin() {
out.printIndent();
}
protected void printLineEnd() {
printLineEnd(null);
}
protected void printLineEnd(String comment) {
if (comment != null) {
out.print(" ");
}
out.print("\n");
}
protected void printList(List list, NamespaceContext ctx) {
out.incrementIndent();
for (Iterator iter = list.iterator(); iter.hasNext();) {
Object value = iter.next();
/*
* If the current value is a node, recurse into that node.
*/
if (value instanceof Node) {
print((Node) value, ctx);
continue;
}
printSimpleItem(value);
}
out.decrementIndent();
}
private void printSimpleItemWithIndent(Object value) {
out.incrementIndent();
printSimpleItem(value);
out.decrementIndent();
}
protected void printSimpleItem(Object value) {
printLineBegin();
out.print(InvokerHelper.toString(value));
printLineEnd();
}
protected void printName(Node node, NamespaceContext ctx, boolean begin) {
if (node == null) {
throw new NullPointerException("Node must not be null.");
}
Object name = node.name();
if (name == null) {
throw new NullPointerException("Name must not be null.");
}
printLineBegin();
out.print("<");
if (!begin) {
out.print("/");
}
out.print(getNameOfNode(node));
if (ctx != null) {
printNamespace(node, ctx);
}
if (begin) {
printNameAttributes(node.attributes());
}
out.print(">");
printLineEnd();
}
protected void printNameAttributes(Map attributes) {
if (attributes == null || attributes.isEmpty()) {
return;
}
for (Iterator iter = attributes.entrySet().iterator(); iter.hasNext();) {
Map.Entry entry = (Map.Entry) iter.next();
out.print(" ");
out.print(entry.getKey().toString());
out.print("=");
Object value = entry.getValue();
out.print(quote);
if (value instanceof String) {
printEscaped((String) value);
} else {
printEscaped(InvokerHelper.toString(value));
}
out.print(quote);
}
}
// For ' and " we only escape if needed. As far as XML is concerned,
// we could always escape if we wanted to.
private void printEscaped(String s) {
for (int i = 0; i < s.length(); i++) {
char c = s.charAt(i);
switch (c) {
case '<':
out.print("<");
break;
case '>':
out.print(">");
break;
case '&':
out.print("&");
break;
case '\'':
if (quote.equals("'"))
out.print("'");
else
out.print(c);
break;
case '"':
if (quote.equals("\""))
out.print(""");
else
out.print(c);
break;
default:
out.print(c);
}
}
}
protected boolean printSpecialNode(Node node) {
return false;
}
protected void printNamespace(Node node, NamespaceContext ctx) {
Object name = node.name();
if (name instanceof QName && namespaceAware) {
QName qname = (QName) name;
String namespaceUri = qname.getNamespaceURI();
if (namespaceUri != null) {
String prefix = qname.getPrefix();
if (!ctx.isNamespaceRegistered(namespaceUri)) {
ctx.registerNamespacePrefix(namespaceUri, prefix);
out.print(" ");
out.print("xmlns");
if (prefix.length() > 0) {
out.print(":");
out.print(prefix);
}
out.print("=" + quote);
out.print(namespaceUri);
out.print(quote);
}
}
}
}
private class NamespaceContext {
Map namespaceMap = new HashMap();
public boolean isNamespaceRegistered(String uri) {
return namespaceMap.containsKey(uri);
}
public void registerNamespacePrefix(String uri, String prefix) {
if (!isNamespaceRegistered(uri)) {
namespaceMap.put(uri, prefix);
}
}
public String getNamespacePrefix(String uri) {
Object prefix = namespaceMap.get(uri);
return (prefix == null) ? null : prefix.toString();
}
}
}
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