JVMParameterProvider.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 2006 - 2008 Pentaho Corporation.  All rights reserved.
 *
 */
package org.pentaho.platform.util;

import java.math.BigDecimal;
import java.util.Date;
import java.util.Iterator;
import java.util.Properties;

import org.pentaho.platform.api.engine.IParameterProvider;

public class JVMParameterProvider implements IParameterProvider {

  public String getStringParameter(final String name, final String defaultValue) {
    return System.getProperty(name, defaultValue);
  }

  public long getLongParameter(final String name, final long defaultValue) {
    String pValue = this.getStringParameter(name, null);
    if (pValue == null) {
      return defaultValue;
    } else {
      try {
        return Long.parseLong(pValue);
      } catch (NumberFormatException nfe) {
        return defaultValue;
      }
    }
  }
  
  public boolean hasParameter(String name) {
    return this.getParameter(name) != null;
  }

  public Date getDateParameter(final String name, final Date defaultValue) {
    return ParameterHelper.parameterToDate(getStringParameter(name, null), defaultValue);
  }

  public Object getDecimalParameter(final String name, final Object defaultValue) {
    String pValue = this.getStringParameter(name, null);
    if (pValue == null) {
      return defaultValue;
    } else {
      try {
        return new BigDecimal(pValue);
      } catch (NumberFormatException ex) {
        return defaultValue;
      }
    }
  }

  public Iterator getParameterNames() {
    Properties props = System.getProperties();
    return props.keySet().iterator();
  }

  public String getParameterType(final String name) {
    return "string"; //$NON-NLS-1$
  }

  public Object getParameter(final String name) {
    return System.getProperty(name);
  }

  public BigDecimal getDecimalParameter(final String name, final BigDecimal defaultValue) {
    return ParameterHelper.parameterToDecimal(getStringParameter(name, ""), defaultValue); //$NON-NLS-1$
  }

  public Object[] getArrayParameter(final String name, final Object[] defaultValue) {
    return ParameterHelper.parameterToObjectArray(getParameter(name), defaultValue);
  }

  public String[] getStringArrayParameter(final String name, final String[] defaultValue) {
    return ParameterHelper.parameterToStringArray(getParameter(name), defaultValue);
  }

}