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Groovy: A powerful, dynamic language for the JVM
/*
* 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.slurpersupport;
import groovy.lang.Buildable;
import groovy.lang.Closure;
import groovy.lang.GroovyObject;
import groovy.lang.Writable;
import java.io.IOException;
import java.io.Writer;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Stack;
/**
* Represents a node.
*
* @author John Wilson
*/
public class Node implements Writable {
private final String name;
private final Map attributes;
private final Map attributeNamespaces;
private final String namespaceURI;
private final List children = new LinkedList();
private final Stack replacementNodeStack = new Stack();
private final Node parent;
/**
* @param parent the parent node
* @param name the name for the node
* @param attributes the attributes for the node
* @param attributeNamespaces the namespace mappings for attributes
* @param namespaceURI the namespace URI if any
*/
public Node(final Node parent, final String name, final Map attributes, final Map attributeNamespaces, final String namespaceURI) {
this.name = name;
this.attributes = attributes;
this.attributeNamespaces = attributeNamespaces;
this.namespaceURI = namespaceURI;
this.parent = parent;
}
/**
* Returns the name of this Node.
* @return the name of this Node
*/
public String name() {
return this.name;
}
/**
* Returns the parent of this Node.
* @return the parent of this Node
*/
public Node parent() {
return this.parent;
}
/**
* Returns the URI of the namespace of this Node.
* @return the namespace of this Node
*/
public String namespaceURI() {
return this.namespaceURI;
}
/**
* Returns a map of the attributes of this Node.
* @return a map of the attributes of this Node
*/
public Map attributes() {
return this.attributes;
}
/**
* Returns a list of the children of this Node.
* @return a list of the children of this Node
*/
public List children() {
return this.children;
}
/**
* Adds an object as a new child to this Node.
* @param child the object to add as a child
*/
public void addChild(final Object child) {
this.children.add(child);
}
public void replaceNode(final Closure replacementClosure, final GPathResult result) {
this.replacementNodeStack.push(new ReplacementNode() {
public void build(final GroovyObject builder, final Map namespaceMap, final Map namespaceTagHints) {
final Closure c = (Closure) replacementClosure.clone();
Node.this.replacementNodeStack.pop(); // disable the replacement whilst the closure is being executed
c.setDelegate(builder);
c.call(new Object[]{result});
Node.this.replacementNodeStack.push(this);
}
});
}
/**
* Replaces the current body of this Node with the passed object.
* @param newValue the new body
*/
protected void replaceBody(final Object newValue) {
this.children.clear();
this.children.add(newValue);
}
protected void appendNode(final Object newValue, final GPathResult result) {
if (newValue instanceof Closure) {
this.children.add(new ReplacementNode() {
public void build(final GroovyObject builder, final Map namespaceMap, final Map namespaceTagHints) {
final Closure c = (Closure) ((Closure) newValue).clone();
c.setDelegate(builder);
c.call(new Object[]{result});
}
});
} else {
this.children.add(newValue);
}
}
/**
* Returns a string containing the text of the children of this Node.
* @return a string containing the text of the children of this Node
*/
public String text() {
final StringBuilder sb = new StringBuilder();
for (Object child : this.children) {
if (child instanceof Node) {
sb.append(((Node) child).text());
} else {
sb.append(child);
}
}
return sb.toString();
}
/**
* Returns the list of any direct String nodes of this node.
*
* @return the list of String values from this node
* @since 2.3.0
*/
public List localText() {
final List result = new ArrayList();
for (Object child : this.children) {
if (!(child instanceof Node)) {
result.add(child.toString());
}
}
return result;
}
/**
* Returns an iterator over the child nodes of this Node.
* @return an iterator over the child nodes of this Node
*/
public Iterator childNodes() {
return new Iterator() {
private final Iterator iter = Node.this.children.iterator();
private Object nextElementNodes = getNextElementNodes();
public boolean hasNext() {
return this.nextElementNodes != null;
}
public Object next() {
try {
return this.nextElementNodes;
} finally {
this.nextElementNodes = getNextElementNodes();
}
}
public void remove() {
throw new UnsupportedOperationException();
}
private Object getNextElementNodes() {
while (iter.hasNext()) {
final Object node = iter.next();
if (node instanceof Node) {
return node;
}
}
return null;
}
};
}
public Writer writeTo(final Writer out) throws IOException {
if (this.replacementNodeStack.empty()) {
for (Object child : this.children) {
if (child instanceof Writable) {
((Writable) child).writeTo(out);
} else {
out.write(child.toString());
}
}
return out;
} else {
return ((Writable) this.replacementNodeStack.peek()).writeTo(out);
}
}
public void build(final GroovyObject builder, final Map namespaceMap, final Map namespaceTagHints) {
if (this.replacementNodeStack.empty()) {
final Closure rest = new Closure(null) {
public Object doCall(final Object o) {
buildChildren(builder, namespaceMap, namespaceTagHints);
return null;
}
};
if (this.namespaceURI.length() == 0 && this.attributeNamespaces.isEmpty()) {
builder.invokeMethod(this.name, new Object[]{this.attributes, rest});
} else {
final List newTags = new LinkedList();
builder.getProperty("mkp");
final List namespaces = (List) builder.invokeMethod("getNamespaces", new Object[]{});
final Map current = (Map) namespaces.get(0);
final Map pending = (Map) namespaces.get(1);
if (this.attributeNamespaces.isEmpty()) {
builder.getProperty(getTagFor(this.namespaceURI, current, pending, namespaceMap, namespaceTagHints, newTags, builder));
builder.invokeMethod(this.name, new Object[]{this.attributes, rest});
} else {
final Map attributesWithNamespaces = new HashMap(this.attributes);
for (Object key : this.attributes.keySet()) {
final Object attributeNamespaceURI = this.attributeNamespaces.get(key);
if (attributeNamespaceURI != null) {
attributesWithNamespaces.put(getTagFor(attributeNamespaceURI, current, pending, namespaceMap, namespaceTagHints, newTags, builder) +
"$" + key, attributesWithNamespaces.remove(key));
}
}
builder.getProperty(getTagFor(this.namespaceURI, current, pending, namespaceMap, namespaceTagHints, newTags, builder));
builder.invokeMethod(this.name, new Object[]{attributesWithNamespaces, rest});
}
// remove the new tags we had to define for this element
if (!newTags.isEmpty()) {
final Iterator iter = newTags.iterator();
do {
pending.remove(iter.next());
} while (iter.hasNext());
}
}
} else {
((ReplacementNode) this.replacementNodeStack.peek()).build(builder, namespaceMap, namespaceTagHints);
}
}
private static String getTagFor(final Object namespaceURI, final Map current,
final Map pending, final Map local, final Map tagHints,
final List newTags, final GroovyObject builder) {
String tag = findNamespaceTag(pending, namespaceURI); // look in the namespaces whose declaration has already been emitted
if (tag == null) {
tag = findNamespaceTag(current, namespaceURI); // look in the namespaces who will be declared at the next element
if (tag == null) {
// we have to declare the namespace - choose a tag
tag = findNamespaceTag(local, namespaceURI); // If the namespace has been declared in the GPath expression use that tag
if (tag == null || tag.length() == 0) {
tag = findNamespaceTag(tagHints, namespaceURI); // If the namespace has been used in the parse document use that tag
}
if (tag == null || tag.length() == 0) { // otherwise make up a new tag and check it has not been used before
int suffix = 0;
do {
final String possibleTag = "tag" + suffix++;
if (!pending.containsKey(possibleTag) && !current.containsKey(possibleTag) && !local.containsKey(possibleTag)) {
tag = possibleTag;
}
} while (tag == null);
}
final Map newNamespace = new HashMap();
newNamespace.put(tag, namespaceURI);
builder.getProperty("mkp");
builder.invokeMethod("declareNamespace", new Object[]{newNamespace});
newTags.add(tag);
}
}
return tag;
}
private static String findNamespaceTag(final Map tagMap, final Object namespaceURI) {
if (tagMap.containsValue(namespaceURI)) {
for (Object o : tagMap.entrySet()) {
final Map.Entry entry = (Map.Entry) o;
if (namespaceURI.equals(entry.getValue())) {
return (String) entry.getKey();
}
}
}
return null;
}
private void buildChildren(final GroovyObject builder, final Map namespaceMap, final Map namespaceTagHints) {
for (Object child : this.children) {
if (child instanceof Node) {
((Node) child).build(builder, namespaceMap, namespaceTagHints);
} else if (child instanceof Buildable) {
((Buildable) child).build(builder);
} else {
builder.getProperty("mkp");
builder.invokeMethod("yield", new Object[]{child});
}
}
}
}