/*
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Lesser General Public License for more details.
*
* Copyright (c) 2001 - 2009 Object Refinery Ltd, Pentaho Corporation and Contributors.. All rights reserved.
*/
package org.pentaho.reporting.engine.classic.core.function.strings;
import java.io.UnsupportedEncodingException;
import java.util.Date;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.pentaho.reporting.engine.classic.core.DataRow;
import org.pentaho.reporting.engine.classic.core.ResourceBundleFactory;
import org.pentaho.reporting.engine.classic.core.filter.MessageFormatSupport;
import org.pentaho.reporting.engine.classic.core.function.AbstractExpression;
import org.pentaho.reporting.engine.classic.core.function.Expression;
import org.pentaho.reporting.libraries.formula.util.URLEncoder;
/**
* Formats a message using named parameters. The parameters are resolved against the current
* data-row.
* <p/>
* This performs the same task as the MessageFormatFilter does inside a text-element.
*
* @author Thomas Morgner
*/
public class MessageFormatExpression extends AbstractExpression
{
private static final Log logger = LogFactory.getLog(MessageFormatExpression.class);
/**
* A internal data-row wrapper that URL-encodes all values returned by the data-row.
*/
private static class EncodeDataRow implements DataRow
{
/**
* The wrappedDataRow datarow.
*/
private DataRow wrappedDataRow;
/**
* The character encoding used for the URL-encoding.
*/
private String encoding;
/**
* Default Constructor.
*/
protected EncodeDataRow()
{
}
/**
* Returns the wrapped data-row.
*
* @return the wrapped data-row.
*/
public DataRow getWrappedDataRow()
{
return wrappedDataRow;
}
/**
* Defines the wrapped data-row.
*
* @param wrappedDataRow the wrapped datarow.
*/
public void setWrappedDataRow(final DataRow wrappedDataRow)
{
this.wrappedDataRow = wrappedDataRow;
}
/**
* Returns the String-encoding used for the URL encoding.
*
* @return the string-encoding.
*/
public String getEncoding()
{
return encoding;
}
/**
* Defines the String-encoding used for the URL encoding.
*
* @param encoding the string-encoding.
*/
public void setEncoding(final String encoding)
{
if (encoding == null)
{
throw new NullPointerException();
}
this.encoding = encoding;
}
/**
* Encodes the given value. The encoding process is skipped, if the value is null, is a number or is a date.
*
* @param fieldValue the value that should be encoded.
* @return the encoded value.
*/
private Object encode(final Object fieldValue)
{
if (fieldValue == null)
{
return null;
}
if (fieldValue instanceof Date)
{
return fieldValue;
}
else if (fieldValue instanceof Number)
{
return fieldValue;
}
try
{
return URLEncoder.encode(String.valueOf(fieldValue), encoding);
}
catch (UnsupportedEncodingException e)
{
MessageFormatExpression.logger.debug("Unsupported Encoding: " + encoding);
return null;
}
}
/**
* Returns the value of the function, expression or column using its specific name. The given name is translated
* into a valid column number and the the column is queried. For functions and expressions, the
* <code>getValue()</code> method is called and for columns from the tablemodel the tablemodel method
* <code>getValueAt(row, column)</code> gets called.
*
* @param col the item index.
* @return the value.
* @throws IllegalStateException if the datarow detected a deadlock.
*/
public Object get(final String col) throws IllegalStateException
{
return encode(wrappedDataRow.get(col));
}
/**
* Checks whether the value contained in the column has changed since the last advance-operation.
*
* @param name the name of the column.
* @return true, if the value has changed, false otherwise.
*/
public boolean isChanged(final String name)
{
return wrappedDataRow.isChanged(name);
}
public String[] getColumnNames()
{
return wrappedDataRow.getColumnNames();
}
}
/**
* The message-format pattern used to compute the result.
*/
private String pattern;
/**
* The message format support translates raw message strings into useable MessageFormat parameters and read the
* necessary input data from the datarow.
*/
private MessageFormatSupport messageFormatSupport;
/**
* A flag indicating whether the data read from the fields should be URL encoded.
*/
private boolean urlEncodeData;
/**
* A flag indicating whether the whole result string should be URL encoded.
*/
private boolean urlEncodeResult;
/**
* The byte-encoding used for the URL encoding.
*/
private String encoding;
/**
* Default constructor.
*/
public MessageFormatExpression()
{
messageFormatSupport = new MessageFormatSupport();
encoding = "ISO-8859-1";
}
/**
* Returns the format string used in the message format.
*
* @return the format string.
*/
public String getPattern()
{
return pattern;
}
/**
* Defines the format string for the {@link java.text.MessageFormat} object used in this implementation.
*
* @param pattern the message format.
*/
public void setPattern(final String pattern)
{
this.pattern = pattern;
}
/**
* Returns the defined character encoding that is used to transform the Java-Unicode strings into bytes.
*
* @return the encoding.
*/
public String getEncoding()
{
return encoding;
}
/**
* Defines the character encoding that is used to transform the Java-Unicode strings into bytes.
*
* @param encoding the encoding.
*/
public void setEncoding(final String encoding)
{
if (encoding == null)
{
throw new NullPointerException();
}
this.encoding = encoding;
}
/**
* Defines, whether the values read from the data-row should be URL encoded. Dates and Number objects are never
* encoded.
*
* @param urlEncode true, if the values from the data-row should be URL encoded before they are passed to the
* MessageFormat, false otherwise.
*/
public void setUrlEncodeValues(final boolean urlEncode)
{
this.urlEncodeData = urlEncode;
}
/**
* Queries, whether the values read from the data-row should be URL encoded.
*
* @return true, if the values are encoded, false otherwise.
*/
public boolean isUrlEncodeValues()
{
return urlEncodeData;
}
/**
* Queries, whether the formatted result-string will be URL encoded.
*
* @return true, if the formatted result will be encoded, false otherwise.
*/
public boolean isUrlEncodeResult()
{
return urlEncodeResult;
}
/**
* Defines, whether the formatted result-string will be URL encoded.
*
* @param urlEncodeResult true, if the formatted result will be encoded, false otherwise.
*/
public void setUrlEncodeResult(final boolean urlEncodeResult)
{
this.urlEncodeResult = urlEncodeResult;
}
/**
* Returns the replacement text that is used if one of the referenced message parameters is null.
*
* @return the replacement text for null-values.
*/
public String getNullString()
{
return messageFormatSupport.getNullString();
}
/**
* Defines the replacement text that is used if one of the referenced message parameters is null.
*
* @param nullString the replacement text for null-values.
*/
public void setNullString(final String nullString)
{
this.messageFormatSupport.setNullString(nullString);
}
/**
* Returns the formatted message.
*
* @return the formatted message.
*/
public Object getValue()
{
final ResourceBundleFactory resourceBundleFactory = getResourceBundleFactory();
messageFormatSupport.setFormatString(pattern);
messageFormatSupport.setLocale(resourceBundleFactory.getLocale());
final String result;
if (isUrlEncodeValues())
{
final EncodeDataRow dataRow = new EncodeDataRow();
dataRow.setEncoding(encoding);
dataRow.setWrappedDataRow(getDataRow());
result = messageFormatSupport.performFormat(dataRow);
}
else
{
result = messageFormatSupport.performFormat(getDataRow());
}
if (isUrlEncodeResult())
{
try
{
return URLEncoder.encode(result, getEncoding());
}
catch (UnsupportedEncodingException e)
{
MessageFormatExpression.logger.debug("Unsupported Encoding: " + encoding);
return null;
}
}
else
{
return result;
}
}
public Expression getInstance()
{
final MessageFormatExpression ex = (MessageFormatExpression) super.getInstance();
ex.messageFormatSupport = new MessageFormatSupport();
return ex;
}
}