/*
* Portions Copyright 2000-2007 Sun Microsystems, Inc. All Rights
* Reserved. Use is subject to license terms.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 only, as published by the Free Software Foundation.
*
* 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
* General Public License version 2 for more details (a copy is
* included at /legal/license.txt).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*/
/*
*/
package gov.nist.core;
import java.util.*;
import java.util.Hashtable;
/**
* Implements a simple NameValue association with a quick lookup.
*
* @version JAIN-SIP-1.1
*
*
* <a href="{@docRoot}/uncopyright.html">This code is in the public domain.</a>
*
*/
public class NameValueList extends GenericObject {
/** Internal name value list. */
private Hashtable nvList;
/** Separator character. */
private String separator;
/**
* Constructs a new list.
* @param listName label for this list
*/
public NameValueList(String listName) {
nvList = new Hashtable();
this.separator = Separators.SEMICOLON;
}
/**
* Gets a list of key names.
* @return list of key names.
*/
public Vector getNames() {
Vector names = new Vector();
Enumeration enumNames = nvList.keys();
while (enumNames.hasMoreElements()) {
names.addElement(enumNames.nextElement());
}
return names;
}
/**
* Gets the enumeration of key names.
* @return enumeration of key names.
*/
public Enumeration getKeys() {
return nvList.keys();
}
/**
* Adds a name value pair to the list.
* @param nv the data to be stored
*/
public void add(NameValue nv) {
if (nv == null)
throw new NullPointerException("null nv");
nvList.put(nv.getName(), nv.getValue());
}
/**
* Sets a namevalue object in this list.
* @param nv the data to be updated
*/
public void set(NameValue nv) {
this.add(nv);
}
/**
* Sets a namevalue object in this list.
* @param name the label for the data element
* @param value the value for the element
*/
public void set(String name, Object value) {
NameValue nv = new NameValue(name, value);
this.set(nv);
}
/**
* Adds a name value record to this list.
* @param name the label for the data element
* @param obj the value for the data element
*/
public void add(String name, Object obj) {
if (name == null)
throw new NullPointerException("name in null ! ");
NameValue nv = new NameValue(name, obj);
add(nv);
}
/**
* Compares if two NameValue lists are equal.
* @param otherObject is the object to compare to.
* @return true if the two objects compare for equality.
*/
public boolean equals(Object otherObject) {
if (!otherObject.getClass().equals
(this.getClass())) {
return false;
}
NameValueList other = (NameValueList) otherObject;
if (this.nvList.size() != other.nvList.size()) {
return false;
}
Enumeration enumNames = nvList.keys();
String currKey;
Object currValue, currValueOther;
while (enumNames.hasMoreElements()) {
currKey = (String)enumNames.nextElement();
currValue = this.nvList.get(currKey);
currValueOther = other.nvList.get(currKey);
if (
(currValueOther == null) || !currValue.equals(currValueOther)) {
return false;
}
}
return true;
}
/**
* Do a lookup on a given name and return value associated with it.
* @param name to be looked up
* @return the object that was found or null if not found
*/
public Object getValue(String name) {
return nvList.get(name.toLowerCase());
}
/**
* Do a lookup on a given name and return value associated with it.
* @param name to be looked up
* @param nameDefault to be returned when name is not found
* @return the object that was found or default if not found
*/
public String getValueDefault(String name, String nameDefault) {
String returnValue = (String)nvList.get(name.toLowerCase());
if (returnValue == null) returnValue = nameDefault;
return returnValue;
}
/**
* Gets the NameValue record given a name.
* @param name the data element laebl to find
* @return the name value found or null if not found
* @since 1.0
*/
public NameValue getNameValue(String name) {
if (name == null)
throw new NullPointerException("null arg!");
String name1 = name.toLowerCase();
NameValue returnValue = null;
Object value = getValue(name1);
if (value != null)
returnValue = new NameValue(name1, value);
return returnValue;
}
/**
* Returns a boolean telling if this NameValueList
* has a record with this name.
* @param name the label to find
* @return true if the element includes a value
* @since 1.0
*/
public boolean hasNameValue(String name) {
return nvList.containsKey(name.toLowerCase());
}
/**
* Removes the element corresponding to this name.
* @param name the label to find
* @return true if successfully removed
* @since 1.0
*/
public boolean delete(String name) {
if (name == null) {
return true;
}
String name1 = name.toLowerCase();
nvList.remove(name1);
return true;
}
/**
* Default constructor.
*/
public NameValueList() {
nvList = new Hashtable();
this.separator = Separators.SEMICOLON;
}
/**
* Makes a copy of the current instance.
* @return copy of current object
*/
public Object clone() {
NameValueList retval = new NameValueList();
retval.separator = this.separator;
Enumeration enumNames = nvList.keys();
String currKey;
while (enumNames.hasMoreElements()) {
currKey = (String)enumNames.nextElement();
retval.add(currKey, nvList.get(currKey));
}
return retval;
}
/**
* Gets the parameter as a String.
* @param name the label to find
* @return the parameter as a string.
*/
public String getParameter(String name) {
Object val = this.getValue(name);
if (val == null)
return null;
if (val instanceof GenericObject)
return ((GenericObject)val).encode();
else return val.toString();
}
/**
* Encodes the contenst as a string.
* @return the encoded text string.
*/
public String encode() {
if (nvList.size() == 0)
return "";
StringBuffer encoding = new StringBuffer();
Enumeration enumNames = nvList.keys();
String currKey;
Object currValue;
while (enumNames.hasMoreElements()) {
currKey = (String)enumNames.nextElement();
encoding.append(currKey);
currValue = nvList.get(currKey);
if (currValue != null) {
if (currValue instanceof GenericObject) {
GenericObject gobj = (GenericObject) currValue;
encoding.append(Separators.EQUALS + gobj.encode());
} else {
String s = currValue.toString();
if (s.length() > 0) {
encoding.append(Separators.EQUALS + s);
}
}
}
if (enumNames.hasMoreElements()) // not last
encoding.append(separator);
}
return encoding.toString();
}
/**
* Encodes the contenst as a string followd by separator.
* @return the encoded text string.
*/
public String encodeWithSep() {
String retVal = encode();
if (retVal.length() > 0) {
retVal = separator + retVal;
}
return retVal;
}
/**
* Converts contenets to a string.
* @return contenets encoded in a text string
*/
public String toString() {
return this.encode();
}
/**
* Sets the separator string to be used in formatted contents.
* @param separator string to use between fields
*/
public void setSeparator(String separator) {
this.separator = separator;
}
/**
* Checks if the listis empty.
* @return true if the size of the list is zero
*/
public boolean isEmpty() {
return this.nvList.size() == 0;
}
/**
* Gets the size of the list.
* @return the count of elements in the list
*/
public int size() {
return nvList.size();
}
}
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