RequestUtils.java from DSpace at Krugle
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/*
* RequestUtils.java
*
* Version: $Revision: 1.0 $
*
* Date: $Date: 2006/07/13 23:20:54 $
*
* Copyright (c) 2002, 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.xmlui.utils;
import java.util.ArrayList;
import java.util.List;
import org.apache.cocoon.environment.Request;
/**
* General utilities for common operations on Request objects.
*
* @author Scott Phillips
*/
public class RequestUtils {
/**
* Get values for a field from a DRI multi value field, since a field may
* have multiple values this method will check for fieldName + "_n" untill
* it does not find any more values. The result is a list of all values
* for a field.
*
* If the value has been seleted to be removed then it is removed from
* the list.
*
* @param request
* the request containing the form information
* @param compositeFieldName
* The fieldName of the composite field.
* @param componentFieldName
* The fieldName of the component field
* @return a List of Strings
*/
public static List<String> getCompositeFieldValues(Request request, String compositeFieldName, String componentFieldName)
{
List<String> values = new ArrayList<String>();
int i = -1;
// Iterate through the values in the form.
valueLoop: while (1 == 1)
{
i++;
String value = null;
// Get the component field's name
if (i == 0)
value = request.getParameter(componentFieldName);
else
value = request.getParameter(componentFieldName + "_" + i);
// If this is null then it's the last one.
if (value == null)
break valueLoop;
// Check to make sure that this value is not selected to be removed.
String[] selected = request.getParameterValues(compositeFieldName + "_selected");
if (selected != null)
{
for (String select : selected)
{
if (select.equals(compositeFieldName + "_" + i))
{
// Found, the user has requested that this value be deleted.
continue valueLoop;
}
}
}
// Only add non blank items to the list
if (value.length() == 0)
continue valueLoop;
// Finaly add it to the list
values.add(value.trim());
}
return values;
}
/**
* Get values from a DRI multi value field, since a field may have multiple
* values this method will check for fieldName + "_n" untill it does not
* find any more values. The result is a list of all values for a field.
*
* If the value has been seleted to be removed then it is removed from
* the list.
*
* @param request
* the request containing the form information
* @param fieldName
* The fieldName of the composite field.
* @return a List of Strings
*/
public static List<String> getFieldValues(Request request, String fieldName)
{
List<String> values = new ArrayList<String>();
int i = -1;
// Iterate through the values in the form.
valueLoop: while (1 == 1)
{
i++;
String value = null;
// Get the component field's name
if (i == 0)
value = request.getParameter(fieldName);
else
value = request.getParameter(fieldName + "_" + i);
// If this is null then it's the last one.
if (value == null)
break valueLoop;
// Check to make sure that this value is not selected to be removed.
String[] selected = request.getParameterValues(fieldName + "_selected");
if (selected != null)
{
for (String select : selected)
{
if (select.equals(fieldName + "_" + i))
{
// Found, the user has requested that this value be deleted.
continue valueLoop;
}
}
}
// Only add non blank items to the list
if (value.length() == 0)
continue valueLoop;
// Finaly add it to the list
values.add(value.trim());
}
return values;
}
/**
* Obtain a parameter from the given request as an int. <code>-1</code> is
* returned if the parameter is garbled or does not exist.
*
* @param request
* the HTTP request
* @param param
* the name of the parameter
*
* @return the integer value of the parameter, or -1
*/
public static int getIntParameter(Request request, String param)
{
String val = request.getParameter(param);
try
{
return Integer.parseInt(val.trim());
}
catch (Exception e)
{
// Problem with parameter
return -1;
}
}
}
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