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Google App Engine compliant variation of FreeMarker.
FreeMarker is a "template engine"; a generic tool to generate text output based on templates.
/*
* Copyright 2014 Attila Szegedi, Daniel Dekany, Jonathan Revusky
*
* 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 freemarker.ext.jdom;
import java.io.FileReader;
import java.io.IOException;
import java.io.Writer;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.WeakHashMap;
import org.jaxen.Context;
import org.jaxen.JaxenException;
import org.jaxen.NamespaceContext;
import org.jaxen.jdom.JDOMXPath;
import org.jdom.Attribute;
import org.jdom.CDATA;
import org.jdom.Comment;
import org.jdom.DocType;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.EntityRef;
import org.jdom.Namespace;
import org.jdom.ProcessingInstruction;
import org.jdom.Text;
import org.jdom.output.XMLOutputter;
import freemarker.template.SimpleHash;
import freemarker.template.SimpleScalar;
import freemarker.template.Template;
import freemarker.template.TemplateCollectionModel;
import freemarker.template.TemplateHashModel;
import freemarker.template.TemplateMethodModel;
import freemarker.template.TemplateModel;
import freemarker.template.TemplateModelException;
import freemarker.template.TemplateModelIterator;
import freemarker.template.TemplateScalarModel;
import freemarker.template.TemplateSequenceModel;
/**
* Provides a template for wrapping JDOM objects. It is capable of storing not only
* a single JDOM node, but a list of JDOM nodes at once (hence the name).
* Each node is an instance of any of the core JDOM node classes (except namespaces,
* which are not supported at the moment), or String for representing text.
* See individual method documentation for exact details on how the class works. In
* short:
*
* - {@link #getAsString()} will render all contained nodes as XML fragment,
*
- {@link #exec(List)} provides full XPath functionality implemented on top of
* the Jaxen library,
* - {@link #get(String)} provides node traversal, copying and filtering - somewhat
* less expressive than XPath, however it does not require the external library and
* it evaluates somewhat faster
* - being a {@link TemplateCollectionModel} allows to iterate the contained node list, and
* - being a {@link TemplateSequenceModel} allows to access the contained nodes by index and query the node count.
*
*
* Note: There is a JDOM independent re-implementation of this class:
* {@link freemarker.ext.xml.NodeListModel freemarker.ext.xml.NodeListModel}
*
* @deprecated Use {@link freemarker.ext.dom.NodeModel} instead.
*/
public class NodeListModel
implements
TemplateHashModel,
TemplateMethodModel,
TemplateCollectionModel,
TemplateSequenceModel,
TemplateScalarModel
{
private static final AttributeXMLOutputter OUTPUT = new AttributeXMLOutputter();
// A convenience singleton for representing a node list without nodes.
private static final NodeListModel EMPTY = new NodeListModel(null, false);
// Cache of already parsed XPath expressions
private static final Map XPATH_CACHE = new WeakHashMap();
private static final NamedNodeOperator NAMED_CHILDREN_OP = new NamedChildrenOp();
private static final NamedNodeOperator NAMED_ATTRIBUTE_OP = new NamedAttributeOp();
private static final NodeOperator ALL_ATTRIBUTES_OP = new AllAttributesOp();
private static final NodeOperator ALL_CHILDREN_OP = new AllChildrenOp();
private static final Map OPERATIONS = createOperations();
private static final Map SPECIAL_OPERATIONS = createSpecialOperations();
private static final int SPECIAL_OPERATION_COPY = 0;
private static final int SPECIAL_OPERATION_UNIQUE = 1;
private static final int SPECIAL_OPERATION_FILTER_NAME = 2;
private static final int SPECIAL_OPERATION_FILTER_TYPE = 3;
private static final int SPECIAL_OPERATION_QUERY_TYPE = 4;
private static final int SPECIAL_OPERATION_REGISTER_NAMESPACE = 5;
private static final int SPECIAL_OPERATION_PLAINTEXT = 6;
// The contained nodes
private final List nodes;
private final Map namespaces;
/**
* Creates a node list that holds a single {@link Document} node.
*/
public NodeListModel(Document document)
{
nodes = document == null ? Collections.EMPTY_LIST : Collections.singletonList(document);
namespaces = new HashMap();
}
/**
* Creates a node list that holds a single {@link Element} node.
*/
public NodeListModel(Element element)
{
nodes = element == null ? Collections.EMPTY_LIST : Collections.singletonList(element);
namespaces = new HashMap();
}
private NodeListModel(Object object, Map namespaces)
{
nodes = object == null ? Collections.EMPTY_LIST : Collections.singletonList(object);
this.namespaces = namespaces;
}
/**
* Creates a node list that holds a list of nodes.
* @param nodes the list of nodes this template should hold. The created template
* will copy the passed nodes list, so changes to the passed list will not affect
* the model.
*/
public NodeListModel(List nodes)
{
this(nodes, true);
}
/**
* Creates a node list that holds a list of nodes.
* @param nodes the list of nodes this template should hold.
* @param copy if true, the created template will copy the passed nodes list,
* so changes to the passed list will not affect the model. If false, the model
* will reference the passed list and will sense changes in it, although no
* operations on the list will be synchronized.
*/
public NodeListModel(List nodes, boolean copy)
{
this.nodes = copy && nodes != null ? new ArrayList(nodes) : (nodes == null ? Collections.EMPTY_LIST : nodes);
namespaces = new HashMap();
}
private NodeListModel(List nodes, Map namespaces)
{
this.nodes = nodes == null ? Collections.EMPTY_LIST : nodes;
this.namespaces = namespaces;
}
private static final NodeListModel createNodeListModel(List list, Map namespaces)
{
if (list == null || list.isEmpty()) {
if (namespaces.isEmpty()) {
return EMPTY;
} else {
return new NodeListModel(Collections.EMPTY_LIST, namespaces);
}
}
if (list.size() == 1) return new NodeListModel(list.get(0), namespaces);
return new NodeListModel(list, namespaces);
}
/**
* Returns true if this model contains no nodes.
*/
public boolean isEmpty()
{
return nodes.isEmpty();
}
/**
* This method returns the string resulting from concatenation
* of string representations of its nodes. Each node is rendered using its XML
* serialization format, while text (String) is rendered as itself. This greatly
* simplifies creating XML-transformation templates, as to output a node contained
* in variable x as XML fragment, you simply write ${x} in the template.
*/
public String getAsString()
throws
TemplateModelException
{
if (isEmpty())
return "";
java.io.StringWriter sw = new java.io.StringWriter(nodes.size() * 128);
try {
for (Iterator i = nodes.iterator(); i.hasNext();) {
Object node = i.next();
if (node instanceof Element)
OUTPUT.output((Element)node, sw);
else if (node instanceof Attribute)
OUTPUT.output((Attribute)node, sw);
else if (node instanceof String)
sw.write(OUTPUT.escapeElementEntities(node.toString()));
else if (node instanceof Text)
OUTPUT.output((Text)node, sw);
else if (node instanceof Document)
OUTPUT.output((Document)node, sw);
else if (node instanceof ProcessingInstruction)
OUTPUT.output((ProcessingInstruction)node, sw);
else if (node instanceof Comment)
OUTPUT.output((Comment)node, sw);
else if (node instanceof CDATA)
OUTPUT.output((CDATA)node, sw);
else if (node instanceof DocType)
OUTPUT.output((DocType)node, sw);
else if (node instanceof EntityRef)
OUTPUT.output((EntityRef)node, sw);
else
throw new TemplateModelException(node.getClass().getName() + " is not a core JDOM class");
}
} catch (IOException e) {
throw new TemplateModelException(e.getMessage());
}
return sw.toString();
}
/**
* Provides node list traversal as well as special functions: filtering by name,
* filtering by node type, shallow-copying, and duplicate removal.
* While not as powerful as the full XPath support built into the
* {@link #exec(List)} method, it does not require the external Jaxen
* library to be present at run time. Below are listed the recognized keys.
* In key descriptions, "applicable to this-and-that node type" means that if
* a key is applied to a node list that contains a node of non-applicable type
* a TemplateMethodModel will be thrown. However, you can use _ftype
* key to explicitly filter out undesired node types prior to applying the
* restricted-applicability key. Also "current nodes" means nodes contained in this
* set.
*
* - * or _children: all direct element children of current nodes (non-recursive). Applicable
* to element and document nodes.
* - @* or _attributes: all attributes of current nodes. Applicable to elements only.
* - _content the complete content of current nodes (non-recursive).
* Applicable to elements and documents.
* - _text: the text of current nodes, one string per node (non-recursive).
* Applicable to elements, attributes, comments, processing instructions (returns its data)
* and CDATA sections. The reserved XML characters ('<' and '&') are escaped.
* - _plaintext: same as _text, but does not escape any characters,
* and instead of returning a NodeList returns a SimpleScalar.
* - _name: the names of current nodes, one string per node (non-recursive).
* Applicable to elements and attributes (returns their local name),
* entities, processing instructions (returns its target), doctypes
* (returns its public ID)
* - _qname: the qualified names of current nodes in [namespacePrefix:]localName
* form, one string per node (non-recursive). Applicable to elements and attributes
* - _cname: the canonical names of current nodes (namespace URI + local name),
* one string per node (non-recursive). Applicable to elements and attributes
* - _nsprefix: namespace prefixes of current nodes,
* one string per node (non-recursive). Applicable to elements and attributes
* - _nsuri: namespace URIs of current nodes,
* one string per node (non-recursive). Applicable to elements and attributes
* - _parent: parent elements of current nodes. Applicable to element, attribute, comment,
* entity, processing instruction.
* - _ancestor: all ancestors up to root element (recursive) of current nodes. Applicable
* to same node types as _parent.
* - _ancestorOrSelf: all ancestors of current nodes plus current nodes. Applicable
* to same node types as _parent.
* - _descendant: all recursive descendant element children of current nodes. Applicable to
* document and element nodes.
*
- _descendantOrSelf: all recursive descendant element children of current nodes
* plus current nodes. Applicable to document and element nodes.
*
- _document: all documents the current nodes belong to.
* Applicable to all nodes except text.
*
- _doctype: doctypes of the current nodes.
* Applicable to document nodes only.
*
- _fname: is a filter-by-name template method model. When called,
* it will yield a node list that contains only those current nodes whose name
* matches one of names passed as argument. Attribute names should NOT be prefixed with the
* at sign (@). Applicable on all node types, however has no effect on unnamed nodes.
* - _ftype: is a filter-by-type template method model. When called,
* it will yield a node list that contains only those current nodes whose type matches one
* of types passed as argument. You should pass a single string to this method
* containing the characters of all types to keep. Valid characters are:
* e (Element), a (Attribute), n (Entity), d (Document), t (DocType),
* c (Comment), p (ProcessingInstruction), x (text). If the string anywhere contains
* the exclamation mark (!), the filter's effect is inverted.
* - _type: Returns a one-character String SimpleScalar containing
* the typecode of the first node in the node list. Valid characters are:
* e (Element), a (Attribute), n (Entity), d (Document), t (DocType),
* c (Comment), p (ProcessingInstruction), x (text). If the type of the node
* is unknown, returns '?'. If the node list is empty, returns an empty string scalar.
* - _unique: a copy of the current nodes that keeps only the
* first occurrence of every node, eliminating duplicates. Duplicates can
* occur in the node list by applying uptree-traversals _parent,
* _ancestor, _ancestorOrSelf, and _document.
* I.e. foo._children._parent will return a node list that has
* duplicates of nodes in foo - each node will have the number of occurrences
* equal to the number of its children. In these cases, use
* foo._children._parent._unique to eliminate duplicates. Applicable
* to all node types.
* - _copy: a copy of the current node list. It is a shallow copy that
* shares the underlying node list with this node list, however it has a
* separate namespace registry, so it can be used to guarantee that subsequent
* changes to the set of registered namespaces does not affect the node lists
* that were used to create this node list. Applicable to all node types.
* - _registerNamespace(prefix, uri): register a XML namespace
* with the specified prefix and URI for the current node list and all node
* lists that are derived from the current node list. After registering,
* you can use the nodelist["prefix:localname"] or
* nodelist["@prefix:localname"] syntaxes to reach elements and
* attributes whose names are namespace-scoped. Note that the namespace
* prefix need not match the actual prefix used by the XML document itself
* since namespaces are compared solely by their URI. You can also register
* namespaces from Java code using the
* {@link #registerNamespace(String, String)} method.
*
* - @attributeName: named attributes of current nodes. Applicable to
* elements, doctypes and processing instructions. On doctypes it supports
* attributes publicId, systemId and elementName. On processing
* instructions, it supports attributes target and data, as
* well as any other attribute name specified in data as name="value" pair.
* The attribute nodes for doctype and processing instruction are synthetic, and
* as such have no parent. Note, however that @* does NOT operate on
* doctypes or processing instructions.
* - any other key: element children of current nodes with name matching the key.
* This allows for convenience child traversal in book.chapter.title style syntax.
* Note that nodeset.childname is technically equivalent to
* nodeset._children._fname("childname"), but is both shorter to write
* and evaluates faster. Applicable to document and element nodes.
*
* The order of nodes in the resulting set is the order of evaluation of the key
* on each node in this set from left to right. Evaluation of the key on a single
* node always yields the results in "natural" order (that of the document preorder
* traversal), even for uptree traversals. As a consequence, if this node list's nodes
* are listed in natural order, applying any of the keys will produce a node list that
* is also naturally ordered. As a special case, all node lists that are directly or
* indirectly generated from a single Document or Element node through repeated
* invocations of this method will be naturally ordered.
* @param key a key that identifies a required set of nodes
* @return a new NodeListModel that represents the requested set of nodes.
*/
public TemplateModel get(String key)
throws
TemplateModelException
{
if (isEmpty())
return EMPTY;
if (key == null || key.length() == 0)
throw new TemplateModelException("Invalid key [" + key + "]");
NodeOperator op = null;
NamedNodeOperator nop = null;
String name = null;
switch (key.charAt(0)) {
case '@':
{
if (key.length() != 2 || key.charAt(1) != '*') {
// Generic attribute key
nop = NAMED_ATTRIBUTE_OP;
name = key.substring(1);
} else
// It is @*
op = ALL_ATTRIBUTES_OP;
break;
}
case '*':
{
if (key.length() == 1)
op = ALL_CHILDREN_OP;
else
// Explicitly disallow any other identifier starting with asterisk
throw new TemplateModelException("Invalid key [" + key + "]");
break;
}
case 'x':
case '_':
{
op = (NodeOperator)OPERATIONS.get(key);
if (op == null) {
// Some special operation?
Integer specop = (Integer)SPECIAL_OPERATIONS.get(key);
if (specop != null) {
switch (specop.intValue()) {
case SPECIAL_OPERATION_COPY:
{
synchronized(namespaces)
{
return new NodeListModel(nodes, (Map)((HashMap)namespaces).clone());
}
}
case SPECIAL_OPERATION_UNIQUE:
return new NodeListModel(removeDuplicates(nodes), namespaces);
case SPECIAL_OPERATION_FILTER_NAME:
return new NameFilter();
case SPECIAL_OPERATION_FILTER_TYPE:
return new TypeFilter();
case SPECIAL_OPERATION_QUERY_TYPE:
return getType();
case SPECIAL_OPERATION_REGISTER_NAMESPACE:
return new RegisterNamespace();
case SPECIAL_OPERATION_PLAINTEXT:
return getPlainText();
}
}
}
break;
}
}
if (op == null && nop == null) {
nop = NAMED_CHILDREN_OP;
name = key;
}
List list = null;
if (op != null)
list = evaluateElementOperation(op, nodes);
else {
String localName = name;
Namespace namespace = Namespace.NO_NAMESPACE;
int colon = name.indexOf(':');
if (colon != -1) {
localName = name.substring(colon + 1);
String nsPrefix = name.substring(0, colon);
synchronized(namespaces)
{
namespace = (Namespace)namespaces.get(nsPrefix);
}
if (namespace == null) {
if (nsPrefix.equals("xml"))
namespace = Namespace.XML_NAMESPACE;
else
throw new TemplateModelException("Unregistered namespace prefix '" + nsPrefix + "'");
}
}
list = evaluateNamedElementOperation(nop, localName, namespace, nodes);
}
return createNodeListModel(list, namespaces);
}
private TemplateModel getType()
{
if (nodes.size() == 0)
return new SimpleScalar("");
Object firstNode = nodes.get(0);
char code;
if (firstNode instanceof Element)
code = 'e';
else if (firstNode instanceof Text || firstNode instanceof String)
code = 'x';
else if (firstNode instanceof Attribute)
code = 'a';
else if (firstNode instanceof EntityRef)
code = 'n';
else if (firstNode instanceof Document)
code = 'd';
else if (firstNode instanceof DocType)
code = 't';
else if (firstNode instanceof Comment)
code = 'c';
else if (firstNode instanceof ProcessingInstruction)
code = 'p';
else
code = '?';
return new SimpleScalar(new String(new char[] { code}));
}
private SimpleScalar getPlainText()
throws
TemplateModelException
{
List list = evaluateElementOperation((TextOp)OPERATIONS.get("_text"), nodes);
StringBuffer buf = new StringBuffer();
for (Iterator it = list.iterator(); it.hasNext();) {
buf.append(it.next());
}
return new SimpleScalar(buf.toString());
}
public TemplateModelIterator iterator()
{
return new TemplateModelIterator()
{
private final Iterator it = nodes.iterator();
public TemplateModel next()
{
return it.hasNext() ? new NodeListModel(it.next(), namespaces) : null;
}
public boolean hasNext()
{
return it.hasNext();
}
};
}
/**
* Retrieves the i-th element of the node list.
*/
public TemplateModel get(int i)
throws
TemplateModelException
{
try {
return new NodeListModel(nodes.get(i), namespaces);
} catch (IndexOutOfBoundsException e) {
throw new TemplateModelException("Index out of bounds: " + e.getMessage());
}
}
public int size()
{
return nodes.size();
}
/**
* Applies an XPath expression to the node list and returns the resulting node list.
* In order for this method to work, your application must have access
* Jaxen library classes. The
* implementation does cache the parsed format of XPath expressions in a weak hash
* map, keyed by the string representation of the XPath expression. As the string
* object passed as the argument is usually kept in the parsed FreeMarker template,
* this ensures that each XPath expression is parsed only once during the lifetime
* of the FreeMarker template that contains it.
* @param arguments the list of arguments. Must contain exactly one string that is
* the XPath expression you wish to apply. The XPath expression can use any namespace
* prefixes that were defined using the {@link #registerNamespace(String, String)}
* method or the nodelist._registerNamespace(prefix, uri) expression in the
* template.
* @return a NodeListModel representing the nodes that are the result of application
* of the XPath to the current node list.
*/
public Object exec(List arguments)
throws
TemplateModelException
{
if (arguments == null || arguments.size() != 1)
throw new TemplateModelException("Exactly one argument required for execute() on NodeTemplate");
String xpathString = (String)arguments.get(0);
JDOMXPathEx xpath = null;
try
{
synchronized(XPATH_CACHE)
{
xpath = (JDOMXPathEx)XPATH_CACHE.get(xpathString);
if (xpath == null)
{
xpath = new JDOMXPathEx(xpathString);
XPATH_CACHE.put(xpathString, xpath);
}
}
return createNodeListModel(xpath.selectNodes(nodes, namespaces), namespaces);
}
catch(Exception e)
{
throw new TemplateModelException("Could not evaulate XPath expression " + xpathString, e);
}
}
/**
* Registers an XML namespace with this node list. Once registered, you can
* refer to the registered namespace using its prefix in the
* {@link #get(String)} method from this node list and all other
* node lists that are derived from this node list. Use the
* nodelist["prefix:localname"] or the
* nodelist["@prefix:localname"] syntax to reach elements and
* attributes whose names are namespace-scoped. Note that the namespace
* prefix need not match the actual prefix used by the XML document itself
* since namespaces are compared solely by their URI. You can also register
* namespaces during template evaluation using the
* nodelist._registerNamespace(prefix, uri) syntax in the template.
* This mechanism is completely independent from the namespace declarations
* in the XML document itself; its purpose is to give you an easy way
* to refer to namespace-scoped elements in {@link #get(String)} and
* in XPath expressions passed to {@link #exec(List)}. Note also that
* the namespace prefix registry is shared among all node lists that
* are created from a single node list - modifying the registry in one
* affects all others as well. If you want to obtain a namespace
* "detached" copy of the node list, use the _copy key on
* it (or call nodeList.get("_copy") directly from your
* Java code. The returned node list has all the namespaces that the
* original node list has, but they can be manipulated independently
* thereon.
*/
public void registerNamespace(String prefix, String uri)
{
synchronized(namespaces)
{
namespaces.put(prefix, Namespace.getNamespace(prefix, uri));
}
}
private interface NodeOperator {
List operate(Object node)
throws
TemplateModelException;
}
private interface NamedNodeOperator {
List operate(Object node, String localName, Namespace namespace)
throws
TemplateModelException;
}
private static final class AllChildrenOp implements NodeOperator {
public List operate(Object node)
{
if (node instanceof Element)
return((Element)node).getChildren();
else if (node instanceof Document) {
Element root = ((Document)node).getRootElement();
return root == null ? Collections.EMPTY_LIST : Collections.singletonList(root);
}
// With 2.1 semantics it makes more sense to just return a null and let the core
// throw an InvalidReferenceException and the template writer can use ?exists etcetera. (JR)
return null;
/*
else
throw new TemplateModelException("_allChildren can not be applied on " + node.getClass());
*/
}
}
private static final class NamedChildrenOp implements NamedNodeOperator {
public List operate(Object node, String localName, Namespace namespace)
{
if (node instanceof Element) {
return((Element)node).getChildren(localName, namespace);
} else if (node instanceof Document) {
Element root = ((Document)node).getRootElement();
if (root != null &&
root.getName().equals(localName) &&
root.getNamespaceURI().equals(namespace.getURI())) {
return Collections.singletonList(root);
} else
return Collections.EMPTY_LIST;
}
// With 2.1 semantics it makes more sense to just return a null and let the core
// throw an InvalidReferenceException and the template writer can use ?exists etcetera. (JR)
return null;
/*
else
throw new TemplateModelException("_namedChildren can not be applied on " + node.getClass());
*/
}
}
private static final class AllAttributesOp implements NodeOperator {
public List operate(Object node)
{
// With 2.1 semantics it makes more sense to just return a null and let the core
// throw an InvalidReferenceException and the template writer can use ?exists etcetera. (JR)
if (!(node instanceof Element)) {
return null;
}
return ((Element)node).getAttributes();
/*
else
throw new TemplateModelException("_allAttributes can not be applied on " + node.getClass());
*/
}
}
private static final class NamedAttributeOp implements NamedNodeOperator {
public List operate(Object node, String localName, Namespace namespace)
{
Attribute attr = null;
if (node instanceof Element) {
Element element = (Element)node;
attr = element.getAttribute(localName, namespace);
} else if (node instanceof ProcessingInstruction) {
ProcessingInstruction pi = (ProcessingInstruction)node;
if ("target".equals(localName))
attr = new Attribute("target", pi.getTarget());
else if ("data".equals(localName))
attr = new Attribute("data", pi.getData());
else
attr = new Attribute(localName, pi.getValue(localName));
} else if (node instanceof DocType) {
DocType doctype = (DocType)node;
if ("publicId".equals(localName))
attr = new Attribute("publicId", doctype.getPublicID());
else if ("systemId".equals(localName))
attr = new Attribute("systemId", doctype.getSystemID());
else if ("elementName".equals(localName))
attr = new Attribute("elementName", doctype.getElementName());
}
// With 2.1 semantics it makes more sense to just return a null and let the core
// throw an InvalidReferenceException and the template writer can use ?exists etcetera. (JR)
else {
return null;
}
/*
else
throw new TemplateModelException("_allAttributes can not be applied on " + node.getClass());
*/
return attr == null ? Collections.EMPTY_LIST : Collections.singletonList(attr);
}
}
private static final class NameOp implements NodeOperator {
public List operate(Object node)
{
if (node instanceof Element)
return Collections.singletonList(((Element)node).getName());
else if (node instanceof Attribute)
return Collections.singletonList(((Attribute)node).getName());
else if (node instanceof EntityRef)
return Collections.singletonList(((EntityRef)node).getName());
else if (node instanceof ProcessingInstruction)
return Collections.singletonList(((ProcessingInstruction)node).getTarget());
else if (node instanceof DocType)
return Collections.singletonList(((DocType)node).getPublicID());
else
return null;
// With 2.1 semantics it makes more sense to just return a null and let the core
// throw an InvalidReferenceException and the template writer can use ?exists etcetera. (JR)
// throw new TemplateModelException("_name can not be applied on " + node.getClass());
}
}
private static final class QNameOp implements NodeOperator {
public List operate(Object node)
{
if (node instanceof Element)
return Collections.singletonList(((Element)node).getQualifiedName());
else if (node instanceof Attribute)
return Collections.singletonList(((Attribute)node).getQualifiedName());
// With 2.1 semantics it makes more sense to just return a null and let the core
// throw an InvalidReferenceException and the template writer can use ?exists etcetera. (JR)
return null;
// throw new TemplateModelException("_qname can not be applied on " + node.getClass());
}
}
private static final class NamespaceUriOp implements NodeOperator {
public List operate(Object node)
{
if (node instanceof Element)
return Collections.singletonList(((Element)node).getNamespace().getURI());
else if (node instanceof Attribute)
return Collections.singletonList(((Attribute)node).getNamespace().getURI());
// With 2.1 semantics it makes more sense to just return a null and let the core
// throw an InvalidReferenceException and the template writer can use ?exists etcetera. (JR)
return null;
// throw new TemplateModelException("_nsuri can not be applied on " + node.getClass());
}
}
private static final class NamespacePrefixOp implements NodeOperator {
public List operate(Object node)
{
if (node instanceof Element)
return Collections.singletonList(((Element)node).getNamespace().getPrefix());
else if (node instanceof Attribute)
return Collections.singletonList(((Attribute)node).getNamespace().getPrefix());
// With 2.1 semantics it makes more sense to just return a null and let the core
// throw an InvalidReferenceException and the template writer can use ?exists etcetera. (JR)
return null;
// throw new TemplateModelException("_nsprefix can not be applied on " + node.getClass());
}
}
private static final class CanonicalNameOp implements NodeOperator {
public List operate(Object node)
{
if (node instanceof Element)
{
Element element = (Element)node;
return Collections.singletonList(element.getNamespace().getURI() + element.getName());
}
else if (node instanceof Attribute)
{
Attribute attribute = (Attribute)node;
return Collections.singletonList(attribute.getNamespace().getURI() + attribute.getName());
}
// With 2.1 semantics it makes more sense to just return a null and let the core
// throw an InvalidReferenceException and the template writer can use ?exists etcetera. (JR)
return null;
// throw new TemplateModelException("_cname can not be applied on " + node.getClass());
}
}
private static final Element getParent(Object node)
{
if (node instanceof Element)
return((Element)node).getParent();
else if (node instanceof Attribute)
return((Attribute)node).getParent();
else if (node instanceof Text)
return((Text)node).getParent();
else if (node instanceof ProcessingInstruction)
return((ProcessingInstruction)node).getParent();
else if (node instanceof Comment)
return((Comment)node).getParent();
else if (node instanceof EntityRef)
return((EntityRef)node).getParent();
else
// With 2.1 semantics it makes more sense to just return a null and let the core
// throw an InvalidReferenceException and the template writer can use ?exists etcetera. (JR)
return null;
// throw new TemplateModelException("_parent can not be applied on " + node.getClass());
}
private static final class ParentOp implements NodeOperator {
public List operate(Object node)
{
Element parent = getParent(node);
return parent == null ? Collections.EMPTY_LIST : Collections.singletonList(parent);
}
}
private static final class AncestorOp implements NodeOperator {
public List operate(Object node)
{
Element parent = getParent(node);
if (parent == null) return Collections.EMPTY_LIST;
LinkedList list = new LinkedList();
do {
list.addFirst(parent);
parent = parent.getParent();
}
while (parent != null);
return list;
}
}
private static final class AncestorOrSelfOp implements NodeOperator {
public List operate(Object node)
{
Element parent = getParent(node);
if (parent == null) return Collections.singletonList(node);
LinkedList list = new LinkedList();
list.addFirst(node);
do {
list.addFirst(parent);
parent = parent.getParent();
}
while (parent != null);
return list;
}
}
private static class DescendantOp implements NodeOperator {
public List operate(Object node)
{
LinkedList list = new LinkedList();
if (node instanceof Element) {
addChildren((Element)node, list);
}
else if (node instanceof Document) {
Element root = ((Document)node).getRootElement();
list.add(root);
addChildren(root, list);
}
else
// With 2.1 semantics it makes more sense to just return a null and let the core
// throw an InvalidReferenceException and the template writer can use ?exists etcetera. (JR)
return null;
// throw new TemplateModelException("_descendant can not be applied on " + node.getClass());
return list;
}
private void addChildren(Element element, List list)
{
List children = element.getChildren();
Iterator it = children.iterator();
while (it.hasNext()) {
Element child = (Element)it.next();
list.add(child);
addChildren(child, list);
}
}
}
private static final class DescendantOrSelfOp extends DescendantOp {
public List operate(Object node)
{
LinkedList list = (LinkedList)super.operate(node);
list.addFirst(node);
return list;
}
}
private static final class DocumentOp implements NodeOperator {
public List operate(Object node)
{
Document doc = null;
if (node instanceof Element)
doc = ((Element)node).getDocument();
else if (node instanceof Attribute) {
Element parent = ((Attribute)node).getParent();
doc = parent == null ? null : parent.getDocument();
} else if (node instanceof Text) {
Element parent = ((Text)node).getParent();
doc = parent == null ? null : parent.getDocument();
} else if (node instanceof Document)
doc = (Document)node;
else if (node instanceof ProcessingInstruction)
doc = ((ProcessingInstruction)node).getDocument();
else if (node instanceof EntityRef)
doc = ((EntityRef)node).getDocument();
else if (node instanceof Comment)
doc = ((Comment)node).getDocument();
else
// With 2.1 semantics it makes more sense to just return a null and let the core
// throw an InvalidReferenceException and the template writer can use ?exists etcetera. (JR)
return null;
// throw new TemplateModelException("_document can not be applied on " + node.getClass());
return doc == null ? Collections.EMPTY_LIST : Collections.singletonList(doc);
}
}
private static final class DocTypeOp implements NodeOperator {
public List operate(Object node)
{
if (node instanceof Document) {
DocType doctype = ((Document)node).getDocType();
return doctype == null ? Collections.EMPTY_LIST : Collections.singletonList(doctype);
} else
// With 2.1 semantics it makes more sense to just return a null and let the core
// throw an InvalidReferenceException and the template writer can use ?exists etcetera. (JR)
return null;
// throw new TemplateModelException("_doctype can not be applied on " + node.getClass());
}
}
private static final class ContentOp implements NodeOperator {
public List operate(Object node)
{
if (node instanceof Element)
return((Element)node).getContent();
else if (node instanceof Document)
return((Document)node).getContent();
// With 2.1 semantics it makes more sense to just return a null and let the core
// throw an InvalidReferenceException and the template writer can use ?exists etcetera. (JR)
return null;
// throw new TemplateModelException("_content can not be applied on " + node.getClass());
}
}
private static final class TextOp implements NodeOperator {
public List operate(Object node)
{
if (node instanceof Element)
return Collections.singletonList(((Element)node).getTextTrim());
if (node instanceof Attribute)
return Collections.singletonList(((Attribute)node).getValue());
if (node instanceof CDATA)
return Collections.singletonList(((CDATA)node).getText());
if (node instanceof Comment)
return Collections.singletonList(((Comment)node).getText());
if (node instanceof ProcessingInstruction)
return Collections.singletonList(((ProcessingInstruction)node).getData());
// With 2.1 semantics it makes more sense to just return a null and let the core
// throw an InvalidReferenceException and the template writer can use ?exists etcetera. (JR)
return null;
// throw new TemplateModelException("_text can not be applied on " + node.getClass());
}
}
private static final List evaluateElementOperation(NodeOperator op, List nodes)
throws
TemplateModelException
{
int s = nodes.size();
List[] lists = new List[s];
int l = 0;
{
int i = 0;
Iterator it = nodes.iterator();
while (it.hasNext()) {
List list = op.operate(it.next());
if (list != null) {
lists[i++] = list;
l += list.size();
}
}
}
List retval = new ArrayList(l);
for (int i = 0; i < s; ++i) {
if (lists[i] != null) {
retval.addAll(lists[i]);
}
}
return retval;
}
private static final List evaluateNamedElementOperation(NamedNodeOperator op, String localName, Namespace namespace, List nodes)
throws
TemplateModelException
{
int s = nodes.size();
List[] lists = new List[s];
int l = 0;
{
int i = 0;
Iterator it = nodes.iterator();
while (it.hasNext()) {
List list = op.operate(it.next(), localName, namespace);
lists[i++] = list;
l += list.size();
}
}
List retval = new ArrayList(l);
for (int i = 0; i < s; ++i)
retval.addAll(lists[i]);
return retval;
}
private static final List removeDuplicates(List list)
{
int s = list.size();
ArrayList ulist = new ArrayList(s);
Set set = new HashSet(s * 4 / 3, .75f);
Iterator it = list.iterator();
while (it.hasNext()) {
Object o = it.next();
if (set.add(o))
ulist.add(o);
}
ulist.trimToSize();
return ulist;
}
private static final Map createOperations()
{
Map map = new HashMap();
map.put("_ancestor", new AncestorOp());
map.put("_ancestorOrSelf", new AncestorOrSelfOp());
map.put("_attributes", ALL_ATTRIBUTES_OP);
map.put("_children", ALL_CHILDREN_OP);
map.put("_cname", new CanonicalNameOp());
map.put("_content", new ContentOp());
map.put("_descendant", new DescendantOp());
map.put("_descendantOrSelf", new DescendantOrSelfOp());
map.put("_document", new DocumentOp());
map.put("_doctype", new DocTypeOp());
map.put("_name", new NameOp());
map.put("_nsprefix", new NamespacePrefixOp());
map.put("_nsuri", new NamespaceUriOp());
map.put("_parent", new ParentOp());
map.put("_qname", new QNameOp());
map.put("_text", new TextOp());
return map;
}
private static final Map createSpecialOperations()
{
Map map = new HashMap();
Integer copy = new Integer(SPECIAL_OPERATION_COPY);
Integer unique = new Integer(SPECIAL_OPERATION_UNIQUE);
Integer fname = new Integer(SPECIAL_OPERATION_FILTER_NAME);
Integer ftype = new Integer(SPECIAL_OPERATION_FILTER_TYPE);
Integer type = new Integer(SPECIAL_OPERATION_QUERY_TYPE);
Integer regns = new Integer(SPECIAL_OPERATION_REGISTER_NAMESPACE);
Integer plaintext = new Integer(SPECIAL_OPERATION_PLAINTEXT);
map.put("_copy", copy);
map.put("_unique", unique);
map.put("_fname", fname);
map.put("_ftype", ftype);
map.put("_type", type);
map.put("_registerNamespace", regns);
map.put("_plaintext", plaintext);
// These are in for backward compatibility
map.put("x_copy", copy);
map.put("x_unique", unique);
map.put("x_fname", fname);
map.put("x_ftype", ftype);
map.put("x_type", type);
return map;
}
private final class RegisterNamespace implements TemplateMethodModel {
public boolean isEmpty()
{
return false;
}
public Object exec(List arguments)
throws
TemplateModelException
{
if (arguments.size() != 2)
throw new TemplateModelException("_registerNamespace(prefix, uri) requires two arguments");
registerNamespace((String)arguments.get(0), (String)arguments.get(1));
return TemplateScalarModel.EMPTY_STRING;
}
}
private final class NameFilter implements TemplateMethodModel {
public boolean isEmpty()
{
return false;
}
public Object exec(List arguments)
{
Set names = new HashSet(arguments);
List list = new LinkedList(nodes);
Iterator it = list.iterator();
while (it.hasNext()) {
Object node = it.next();
String name = null;
if (node instanceof Element)
name = ((Element)node).getName();
else if (node instanceof Attribute)
name = ((Attribute)node).getName();
else if (node instanceof ProcessingInstruction)
name = ((ProcessingInstruction)node).getTarget();
else if (node instanceof EntityRef)
name = ((EntityRef)node).getName();
else if (node instanceof DocType)
name = ((DocType)node).getPublicID();
if (name == null || !names.contains(name))
it.remove();
}
return createNodeListModel(list, namespaces);
}
}
private final class TypeFilter implements TemplateMethodModel {
public boolean isEmpty()
{
return false;
}
public Object exec(List arguments)
throws
TemplateModelException
{
if (arguments == null || arguments.size() == 0)
throw new TemplateModelException("_type expects exactly one argument");
String arg = (String)arguments.get(0);
boolean invert = arg.indexOf('!') != -1;
// NOTE: true in each of these variables means 'remove', not 'keep'
// This is so we don't invert their values in the loop. So,
// a is true <--> (a is not present in the string) xor invert.
boolean a = invert != (arg.indexOf('a') == -1);
boolean c = invert != (arg.indexOf('c') == -1);
boolean d = invert != (arg.indexOf('d') == -1);
boolean e = invert != (arg.indexOf('e') == -1);
boolean n = invert != (arg.indexOf('n') == -1);
boolean p = invert != (arg.indexOf('p') == -1);
boolean t = invert != (arg.indexOf('t') == -1);
boolean x = invert != (arg.indexOf('x') == -1);
LinkedList list = new LinkedList(nodes);
Iterator it = list.iterator();
while (it.hasNext()) {
Object node = it.next();
if ((node instanceof Element && e)
|| (node instanceof Attribute && a)
|| (node instanceof String && x)
|| (node instanceof Text && x)
|| (node instanceof ProcessingInstruction && p)
|| (node instanceof Comment && c)
|| (node instanceof EntityRef && n)
|| (node instanceof Document && d)
|| (node instanceof DocType && t))
it.remove();
}
return createNodeListModel(list, namespaces);
}
}
/**
* Loads a template from a file passed as the first argument, loads an XML
* document from the standard input, passes it to the template as variable
* document and writes the result of template processing to
* standard output.
*/
public static void main(String[] args)
throws
Exception
{
org.jdom.input.SAXBuilder builder = new org.jdom.input.SAXBuilder();
Document document = builder.build(System.in);
SimpleHash model = new SimpleHash();
model.put("document", new NodeListModel(document));
FileReader fr = new FileReader(args[0]);
Template template = new Template(args[0], fr);
Writer w = new java.io.OutputStreamWriter(System.out);
template.process(model, w);
w.flush();
w.close();
}
private static final class AttributeXMLOutputter extends XMLOutputter {
public void output(Attribute attribute, Writer out)
throws
IOException
{
out.write(" ");
out.write(attribute.getQualifiedName());
out.write("=");
out.write("\"");
out.write(escapeAttributeEntities(attribute.getValue()));
out.write("\"");
}
}
private static final class JDOMXPathEx
extends
JDOMXPath
{
JDOMXPathEx(String path)
throws
JaxenException
{
super(path);
}
public List selectNodes(Object object, Map namespaces)
throws
JaxenException
{
Context context = getContext(object);
context.getContextSupport().setNamespaceContext(new NamespaceContextImpl(namespaces));
return selectNodesForContext(context);
}
private static final class NamespaceContextImpl
implements
NamespaceContext
{
private final Map namespaces;
NamespaceContextImpl(Map namespaces)
{
this.namespaces = namespaces;
}
public String translateNamespacePrefixToUri(String prefix)
{
// Empty prefix always maps to empty URL in XPath
if(prefix.length() == 0)
{
return prefix;
}
synchronized(namespaces)
{
Namespace ns = (Namespace)namespaces.get(prefix);
return ns == null ? null : ns.getURI();
}
}
}
}
}