DCInputsReader.java from DSpace at Krugle
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/*
* DCInputsReader.java
*
* Version: $Revision: 2079 $
*
* Date: $Date: 2007-07-20 13:49:01 -0700 (Fri, 20 Jul 2007) $
*
* Copyright (c) 2002-2005, Hewlett-Packard Company and Massachusetts
* Institute of Technology. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of the Hewlett-Packard Company nor the name of the
* Massachusetts Institute of Technology nor the names of their
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*/
package org.dspace.app.util;
import java.io.File;
import java.util.Vector;
import java.util.HashMap;
import java.util.Iterator;
import java.lang.Exception;
import javax.servlet.ServletException;
import org.xml.sax.SAXException;
import org.w3c.dom.*;
import javax.xml.parsers.*;
import org.apache.log4j.Logger;
import org.dspace.content.MetadataSchema;
import org.dspace.core.ConfigurationManager;
/**
* Submission form generator for DSpace. Reads and parses the installation
* form definitions file, input-forms.xml, from the configuration directory.
* A forms definition details the page and field layout of the metadata
* collection pages used by the submission process. Each forms definition
* starts with a unique name that gets associated with that form set.
*
* The file also specifies which collections use which form sets. At a
* minimum, the definitions file must define a default mapping from the
* placeholder collection #0 to the distinguished form 'default'. Any
* collections that use a custom form set are listed paired with the name
* of the form set they use.
*
* The definitions file also may contain sets of value pairs. Each value pair
* will contain one string that the user reads, and a paired string that will
* supply the value stored in the database if its sibling display value gets
* selected from a choice list.
*
* @author Brian S. Hughes
* @version $Revision: 2079 $
*/
public class DCInputsReader
{
/**
* The ID of the default collection. Will never be the ID of a named
* collection
*/
public static final String DEFAULT_COLLECTION = "default";
/** Name of the form definition XML file */
static final String FORM_DEF_FILE = "input-forms.xml";
/** Keyname for storing dropdown value-pair set name */
static final String PAIR_TYPE_NAME = "value-pairs-name";
/** log4j logger */
private static Logger log = Logger.getLogger(DCInputsReader.class);
/** The fully qualified pathname of the form definition XML file */
private String defsFile = ConfigurationManager.getProperty("dspace.dir")
+ File.separator + "config" + File.separator + FORM_DEF_FILE;
/**
* Reference to the collections to forms map, computed from the forms
* definition file
*/
private HashMap whichForms = null;
/**
* Reference to the forms definitions map, computed from the forms
* definition file
*/
private HashMap formDefns = null;
/**
* Reference to the forms which allow, disallow or mandate files to be
* uploaded.
*/
private HashMap formFileUploadDefns = null;
/**
* Reference to the value-pairs map, computed from the forms defition file
*/
private HashMap valuePairs = null; // Holds display/storage pairs
/**
* Mini-cache of last DCInputSet requested. If submissions are not typically
* form-interleaved, there will be a modest win.
*/
private DCInputSet lastInputSet = null;
/**
* Parse an XML encoded submission forms template file, and create a hashmap
* containing all the form information. This hashmap will contain three top
* level structures: a map between collections and forms, the definition for
* each page of each form, and lists of pairs of values that populate
* selection boxes.
*/
public DCInputsReader()
throws ServletException
{
buildInputs(defsFile);
}
public DCInputsReader(String fileName)
throws ServletException
{
buildInputs(fileName);
}
private void buildInputs(String fileName)
throws ServletException
{
whichForms = new HashMap();
formDefns = new HashMap();
valuePairs = new HashMap();
String uri = "file:" + new File(fileName).getAbsolutePath();
try
{
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setValidating(false);
factory.setIgnoringComments(true);
factory.setIgnoringElementContentWhitespace(true);
DocumentBuilder db = factory.newDocumentBuilder();
Document doc = db.parse(uri);
doNodes(doc);
checkValues();
}
catch (FactoryConfigurationError fe)
{
throw new ServletException("Cannot create Submission form parser",fe);
}
catch (Exception e)
{
throw new ServletException("Error creating submission forms: "+e);
}
}
/**
* Returns the set of DC inputs used for a particular collection, or the
* default set if no inputs defined for the collection
*
* @param collectionHandle
* collection's unique Handle
* @return DC input set
* @throws ServletException
* if no default set defined
*/
public DCInputSet getInputs(String collectionHandle)
throws ServletException
{
String formName = (String)whichForms.get(collectionHandle);
if (formName == null)
{
formName = (String)whichForms.get(DEFAULT_COLLECTION);
}
if (formName == null)
{
throw new ServletException("No form designated as default");
}
// check mini-cache, and return if match
if ( lastInputSet != null && lastInputSet.getFormName().equals( formName ) )
{
return lastInputSet;
}
// cache miss - construct new DCInputSet
Vector pages = (Vector)formDefns.get(formName);
if ( pages == null )
{
throw new ServletException("Missing the default form");
}
lastInputSet = new DCInputSet(formName, pages, valuePairs);
return lastInputSet;
}
/**
* Return the number of pages the inputs span for a desginated collection
* @param collectionHandle collection's unique Handle
* @return number of pages of input
* @throws ServletException if no default set defined
*/
public int getNumberInputPages(String collectionHandle)
throws ServletException
{
return getInputs(collectionHandle).getNumberPages();
}
/**
* Process the top level child nodes in the passed top-level node. These
* should correspond to the collection-form maps, the form definitions, and
* the display/storage word pairs.
*/
private void doNodes(Node n)
throws SAXException, ServletException
{
if (n == null)
{
return;
}
Node e = getElement(n);
NodeList nl = e.getChildNodes();
int len = nl.getLength();
boolean foundMap = false;
boolean foundDefs = false;
for (int i = 0; i < len; i++)
{
Node nd = nl.item(i);
if ((nd == null) || isEmptyTextNode(nd))
{
continue;
}
String tagName = nd.getNodeName();
if (tagName.equals("form-map"))
{
processMap(nd);
foundMap = true;
}
else if (tagName.equals("form-definitions"))
{
processDefinition(nd);
foundDefs = true;
}
else if (tagName.equals("form-value-pairs"))
{
processValuePairs(nd);
}
// Ignore unknown nodes
}
if (!foundMap)
{
throw new ServletException("No collection to form map found");
}
if (!foundDefs)
{
throw new ServletException("No form definition found");
}
}
/**
* Process the form-map section of the XML file.
* Each element looks like:
* <name-map collection-handle="hdl" form-name="name" />
* Extract the collection handle and form name, put name in hashmap keyed
* by the collection handle.
*/
private void processMap(Node e)
throws SAXException
{
NodeList nl = e.getChildNodes();
int len = nl.getLength();
for (int i = 0; i < len; i++)
{
Node nd = nl.item(i);
if (nd.getNodeName().equals("name-map"))
{
String id = getAttribute(nd, "collection-handle");
String value = getAttribute(nd, "form-name");
String content = getValue(nd);
if (id == null)
{
throw new SAXException("name-map element is missing collection-handle attribute");
}
if (value == null)
{
throw new SAXException("name-map element is missing form-name attribute");
}
if (content != null && content.length() > 0)
{
throw new SAXException("name-map element has content, it should be empty.");
}
whichForms.put(id, value);
} // ignore any child node that isn't a "name-map"
}
}
/**
* Process the form-definitions section of the XML file. Each element is
* formed thusly: <form name="formname">...pages...</form> Each pages
* subsection is formed: <page number="#"> ...fields... </page> Each field
* is formed from: dc-element, dc-qualifier, label, hint, input-type name,
* required text, and repeatable flag.
*/
private void processDefinition(Node e)
throws SAXException, ServletException
{
int numForms = 0;
NodeList nl = e.getChildNodes();
int len = nl.getLength();
for (int i = 0; i < len; i++)
{
Node nd = nl.item(i);
// process each form definition
if (nd.getNodeName().equals("form"))
{
numForms++;
String formName = getAttribute(nd, "name");
if (formName == null)
{
throw new SAXException("form element has no name attribute");
}
Vector pages = new Vector(); // the form contains pages
formDefns.put(formName, pages);
NodeList pl = nd.getChildNodes();
int lenpg = pl.getLength();
for (int j = 0; j < lenpg; j++)
{
Node npg = pl.item(j);
// process each page definition
if (npg.getNodeName().equals("page"))
{
String pgNum = getAttribute(npg, "number");
if (pgNum == null)
{
throw new SAXException("Form " + formName + " has no identified pages");
}
Vector page = new Vector();
pages.add(page);
NodeList flds = npg.getChildNodes();
int lenflds = flds.getLength();
for (int k = 0; k < lenflds; k++)
{
Node nfld = flds.item(k);
if ( nfld.getNodeName().equals("field") )
{
// process each field definition
HashMap field = new HashMap();
page.add(field);
processPageParts(formName, pgNum, nfld, field);
String error = checkForDups(formName, field, pages);
if (error != null)
{
throw new SAXException(error);
}
}
}
} // ignore any child that is not a 'page'
}
// sanity check number of pages
if (pages.size() < 1)
{
throw new ServletException("Form " + formName + " has no pages");
}
}
}
if (numForms == 0)
{
throw new ServletException("No form definition found");
}
}
/**
* Process parts of a field
* At the end, make sure that input-types 'qualdrop_value' and
* 'twobox' are marked repeatable. Complain if dc-element, label,
* or input-type are missing.
*/
private void processPageParts(String formName, String page, Node n, HashMap field)
throws SAXException
{
NodeList nl = n.getChildNodes();
int len = nl.getLength();
for (int i = 0; i < len; i++)
{
Node nd = nl.item(i);
if ( ! isEmptyTextNode(nd) )
{
String tagName = nd.getNodeName();
String value = getValue(nd);
field.put(tagName, value);
if (tagName.equals("input-type"))
{
if (value.equals("dropdown")
|| value.equals("qualdrop_value")
|| value.equals("list"))
{
String pairTypeName = getAttribute(nd, PAIR_TYPE_NAME);
if (pairTypeName == null)
{
throw new SAXException("Form " + formName + ", field " +
field.get("dc-element") +
"." + field.get("dc-qualifier") +
" has no name attribute");
}
else
{
field.put(PAIR_TYPE_NAME, pairTypeName);
}
}
}
else if (tagName.equals("vocabulary"))
{
String closedVocabularyString = getAttribute(nd, "closed");
field.put("closedVocabulary", closedVocabularyString);
}
}
}
String missing = null;
if (field.get("dc-element") == null)
{
missing = "dc-element";
}
if (field.get("label") == null)
{
missing = "label";
}
if (field.get("input-type") == null)
{
missing = "input-type";
}
if ( missing != null )
{
String msg = "Required field " + missing + " missing on page " + page + " of form " + formName;
throw new SAXException(msg);
}
String type = (String)field.get("input-type");
if (type.equals("twobox") || type.equals("qualdrop_value"))
{
String rpt = (String)field.get("repeatable");
if ((rpt == null) ||
((!rpt.equalsIgnoreCase("yes")) &&
(!rpt.equalsIgnoreCase("true"))))
{
String msg = "The field \'"+field.get("label")+"\' must be repeatable";
throw new SAXException(msg);
}
}
}
/**
* Check that this is the only field with the name dc-element.dc-qualifier
* If there is a duplicate, return an error message, else return null;
*/
private String checkForDups(String formName, HashMap field, Vector pages)
{
int matches = 0;
String err = null;
String schema = (String)field.get("dc-schema");
String elem = (String)field.get("dc-element");
String qual = (String)field.get("dc-qualifier");
if ((schema == null) || (schema.equals("")))
{
schema = MetadataSchema.DC_SCHEMA;
}
String schemaTest;
for (int i = 0; i < pages.size(); i++)
{
Vector pg = (Vector)pages.get(i);
for (int j = 0; j < pg.size(); j++)
{
HashMap fld = (HashMap)pg.get(j);
if ((fld.get("dc-schema") == null) ||
(((String)fld.get("dc-schema")).equals("")))
{
schemaTest = MetadataSchema.DC_SCHEMA;
}
else
{
schemaTest = (String)fld.get("dc-schema");
}
// Are the schema and element the same? If so, check the qualifier
if ((((String)fld.get("dc-element")).equals(elem)) &&
(schemaTest.equals(schema)))
{
String ql = (String)fld.get("dc-qualifier");
if (qual != null)
{
if ((ql != null) && ql.equals(qual))
{
matches++;
}
}
else if (ql == null)
{
matches++;
}
}
}
}
if (matches > 1)
{
err = "Duplicate field " + schema + "." + elem + "." + qual + " detected in form " + formName;
}
return err;
}
/**
* Process the form-value-pairs section of the XML file.
* Each element is formed thusly:
* <value-pairs name="..." dc-term="...">
* <pair>
* <display>displayed name-</display>
* <storage>stored name</storage>
* </pair>
* For each value-pairs element, create a new vector, and extract all
* the pairs contained within it. Put the display and storage values,
* respectively, in the next slots in the vector. Store the vector
* in the passed in hashmap.
*/
private void processValuePairs(Node e)
throws SAXException
{
NodeList nl = e.getChildNodes();
int len = nl.getLength();
for (int i = 0; i < len; i++)
{
Node nd = nl.item(i);
String tagName = nd.getNodeName();
// process each value-pairs set
if (tagName.equals("value-pairs"))
{
String pairsName = getAttribute(nd, PAIR_TYPE_NAME);
String dcTerm = getAttribute(nd, "dc-term");
if (pairsName == null)
{
String errString =
"Missing name attribute for value-pairs for DC term " + dcTerm;
throw new SAXException(errString);
}
Vector pairs = new Vector();
valuePairs.put(pairsName, pairs);
NodeList cl = nd.getChildNodes();
int lench = cl.getLength();
for (int j = 0; j < lench; j++)
{
Node nch = cl.item(j);
String display = null;
String storage = null;
if (nch.getNodeName().equals("pair"))
{
NodeList pl = nch.getChildNodes();
int plen = pl.getLength();
for (int k = 0; k < plen; k++)
{
Node vn= pl.item(k);
String vName = vn.getNodeName();
if (vName.equals("displayed-value"))
{
display = getValue(vn);
}
else if (vName.equals("stored-value"))
{
storage = getValue(vn);
if (storage == null)
{
storage = "";
}
} // ignore any children that aren't 'display' or 'storage'
}
pairs.add(display);
pairs.add(storage);
} // ignore any children that aren't a 'pair'
}
} // ignore any children that aren't a 'value-pair'
}
}
/**
* Check that all referenced value-pairs are present
* and field is consistent
*
* Throws ServletException if detects a missing value-pair.
*/
private void checkValues()
throws ServletException
{
// Step through every field of every page of every form
Iterator ki = formDefns.keySet().iterator();
while (ki.hasNext())
{
String idName = (String)ki.next();
Vector pages = (Vector)formDefns.get(idName);
for (int i = 0; i < pages.size(); i++)
{
Vector page = (Vector)pages.get(i);
for (int j = 0; j < page.size(); j++)
{
HashMap fld = (HashMap)page.get(j);
// verify reference in certain input types
String type = (String)fld.get("input-type");
if (type.equals("dropdown")
|| type.equals("qualdrop_value")
|| type.equals("list"))
{
String pairsName = (String)fld.get(PAIR_TYPE_NAME);
Vector v = (Vector)valuePairs.get(pairsName);
if (v == null)
{
String errString = "Cannot find value pairs for " + pairsName;
throw new ServletException(errString);
}
}
// if visibility restricted, make sure field is not required
String visibility = (String)fld.get("visibility");
if (visibility != null && visibility.length() > 0 )
{
String required = (String)fld.get("required");
if (required != null && required.length() > 0)
{
String errString = "Field '" + (String)fld.get("label") +
"' is required but invisible";
throw new ServletException(errString);
}
}
}
}
}
}
private Node getElement(Node nd)
{
NodeList nl = nd.getChildNodes();
int len = nl.getLength();
for (int i = 0; i < len; i++)
{
Node n = nl.item(i);
if (n.getNodeType() == Node.ELEMENT_NODE)
{
return n;
}
}
return null;
}
private boolean isEmptyTextNode(Node nd)
{
boolean isEmpty = false;
if (nd.getNodeType() == Node.TEXT_NODE)
{
String text = nd.getNodeValue().trim();
if (text.length() == 0)
{
isEmpty = true;
}
}
return isEmpty;
}
/**
* Returns the value of the node's attribute named <name>
*/
private String getAttribute(Node e, String name)
{
NamedNodeMap attrs = e.getAttributes();
int len = attrs.getLength();
if (len > 0)
{
int i;
for (i = 0; i < len; i++)
{
Node attr = attrs.item(i);
if (name.equals(attr.getNodeName()))
{
return attr.getNodeValue().trim();
}
}
}
//no such attribute
return null;
}
/**
* Returns the value found in the Text node (if any) in the
* node list that's passed in.
*/
private String getValue(Node nd)
{
NodeList nl = nd.getChildNodes();
int len = nl.getLength();
for (int i = 0; i < len; i++)
{
Node n = nl.item(i);
short type = n.getNodeType();
if (type == Node.TEXT_NODE)
{
return n.getNodeValue().trim();
}
}
// Didn't find a text node
return null;
}
}
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