ParameterHelper.java

/*
 * 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 2005 - 2008 Pentaho Corporation.  All rights reserved.
 *
 * @created Jun 20, 2005 
 * @author James Dixon
 * 
 */

package org.pentaho.platform.util;

import java.math.BigDecimal;
import java.text.DateFormat;
import java.util.Date;

import org.pentaho.platform.util.logging.Logger;
import org.pentaho.platform.util.messages.Messages;

/**
 * @author James Dixon
 * 
 * TODO To change the template for this generated type comment go to Window -
 * Preferences - Java - Code Style - Code Templates
 */
public class ParameterHelper {

  public static String parameterToString(final String value, final String defaultValue) {
    if (value == null) {
      return defaultValue;
    }
    return value;
  }

  public static long parameterToLong(final String value, final long defaultValue) {
    if (value == null) {
      return defaultValue;
    }
    try {
      long longValue = Long.valueOf(value).longValue();
      return longValue;
    } catch (Exception e) {
      Logger.error(ParameterHelper.class.getName(), Messages.getInstance()
          .getErrorString("ParameterHelper.ERROR_0001_INVALID_NUMERIC"), e); //$NON-NLS-1$
    }
    return defaultValue;
  }

  public static Date parameterToDate(final String value, final Date defaultValue) {
    try {
      Date date = DateFormat.getInstance().parse(value);
      if (date == null) {
        return defaultValue;
      }
      return date;
    } catch (Exception e) {
      return defaultValue;
    }
  }

  public static BigDecimal parameterToDecimal(final String value, final BigDecimal defaultValue) {
    if (value == null) {
      return defaultValue;
    }
    try {
      BigDecimal decimal = new BigDecimal(value);
      return decimal;
    } catch (Exception e) {
      Logger.error(ParameterHelper.class.getName(), Messages.getInstance()
          .getErrorString("ParameterHelper.ERROR_0001_INVALID_NUMERIC"), e); //$NON-NLS-1$
    }
    return defaultValue;
  }

  public static Object[] parameterToObjectArray(final Object value, final Object[] defaultValue) {
    if (value == null) {
      return defaultValue;
    }

    if (value instanceof Object[]) {
      return (Object[]) value;
    }

    return new Object[] { value };
  }

  public static String[] parameterToStringArray(final Object value, final String[] defaultValue) {
    if (value == null) {
      return defaultValue;
    }

    if (value instanceof String[]) {
      return (String[]) value;
    }

    if (value instanceof Object[]) {
      Object[] oArray = (Object[]) value;
      for (int i = 0; i < oArray.length; ++i) {
        oArray[i] = oArray[i].toString();
      }
      return (String[]) oArray;
    }

    return new String[] { value.toString() };
  }

}