/*
* Conditions Of Use
*
* This software was developed by employees of the National Institute of
* Standards and Technology (NIST), an agency of the Federal Government.
* Pursuant to title 15 Untied States Code Section 105, works of NIST
* employees are not subject to copyright protection in the United States
* and are considered to be in the public domain.  As a result, a formal
* license is not needed to use the software.
*
* This software is provided by NIST as a service and is expressly
* provided "AS IS."  NIST MAKES NO WARRANTY OF ANY KIND, EXPRESS, IMPLIED
* OR STATUTORY, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTY OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT
* AND DATA ACCURACY.  NIST does not warrant or make any representations
* regarding the use of the software or the results thereof, including but
* not limited to the correctness, accuracy, reliability or usefulness of
* the software.
*
* Permission to use this software is contingent upon your acceptance
* of the terms of this agreement
*
* .
*
*/
/**************************************************************************/
/* Product of NIST Advanced Networking Technologies Division  */
/**************************************************************************/

package gov.nist.javax.sip.header;
import gov.nist.core.DuplicateNameValueList;
import gov.nist.core.NameValue;
import gov.nist.core.NameValueList;
import gov.nist.javax.sip.address.GenericURI;

import java.io.Serializable;
import java.text.ParseException;
import java.util.Iterator;

import javax.sip.header.Parameters;

/**
 * Parameters header. Suitable for extension by headers that have parameters.
 *
 * @author M. Ranganathan   <br/>
 *
 *
 * @version 1.2 $Revision: 1.15 $ $Date: 2010/01/12 00:05:27 $
 *
 */
public abstract class ParametersHeader
    extends SIPHeader
    implements javax.sip.header.Parameters, Serializable {
    protected NameValueList parameters;
    
    protected DuplicateNameValueList duplicates;
    
    protected ParametersHeader() {
        this.parameters = new NameValueList();
        this.duplicates = new DuplicateNameValueList();
    }

    protected ParametersHeader(String hdrName) {
        super(hdrName);
        this.parameters = new NameValueList();
        this.duplicates = new DuplicateNameValueList();
    }

    protected ParametersHeader(String hdrName, boolean sync) {
        super(hdrName);
        this.parameters = new NameValueList(sync);
        this.duplicates = new DuplicateNameValueList();
    }

    /**
     * Returns the value of the named parameter, or null if it is not set. A
     * zero-length String indicates flag parameter.
     *
     * @param name name of parameter to retrieve
     * @return the value of specified parameter
     */

    public String getParameter(String name) {
        return this.parameters.getParameter(name);

    }

    /**
     * Return the parameter as an object (dont convert to string).
     *
     * @param name is the name of the parameter to get.
     * @return the object associated with the name.
     */
    public Object getParameterValue(String name) {
        return this.parameters.getValue(name);
    }

    /**
     * Returns an Iterator over the names (Strings) of all parameters present
     * in this ParametersHeader.
     *
     * @return an Iterator over all the parameter names
     */

    public Iterator<String> getParameterNames() {
        return parameters.getNames();
    }

    /** Return true if you have a parameter and false otherwise.
     *
     *@return true if the parameters list is non-empty.
     */

    public boolean hasParameters() {
        return parameters != null && !parameters.isEmpty();
    }

    /**
    * Removes the specified parameter from Parameters of this ParametersHeader.
    * This method returns silently if the parameter is not part of the
    * ParametersHeader.
    *
    * @param name - a String specifying the parameter name
    */

    public void removeParameter(String name) {
        this.parameters.delete(name);
    }

    /**
     * Sets the value of the specified parameter. If the parameter already had
     *
     * a value it will be overwritten. A zero-length String indicates flag
     *
     * parameter.
     *
     *
     *
     * @param name - a String specifying the parameter name
     *
     * @param value - a String specifying the parameter value
     *
     * @throws ParseException which signals that an error has been reached
     *
     * unexpectedly while parsing the parameter name or value.
     *
     */
    public void setParameter(String name, String value) throws ParseException {
        NameValue nv = parameters.getNameValue(name);
        if (nv != null) {
            nv.setValueAsObject(value);
        } else {
            nv = new NameValue(name, value);
            this.parameters.set(nv);
        }
    }
    
    /**
     * Sets the value of the specified parameter. If the parameter already had
     *
     * a value it will be overwritten. A zero-length String indicates flag
     *
     * parameter.
     *
     *
     *
     * @param name - a String specifying the parameter name
     *
     * @param value - a String specifying the parameter value
     *
     * @throws ParseException which signals that an error has been reached
     *
     * unexpectedly while parsing the parameter name or value.
     *
     */
    public void setQuotedParameter(String name, String value)
        throws ParseException {
        NameValue nv = parameters.getNameValue(name);
        if (nv != null) {
            nv.setValueAsObject(value);
            nv.setQuotedValue();
        } else {
            nv = new NameValue(name, value);
            nv.setQuotedValue();
            this.parameters.set(nv);
        }
    }

    /**
     * Sets the value of the specified parameter. If the parameter already had
     *
     * a value it will be overwritten.
     *
     *
     * @param name - a String specifying the parameter name
     *
     * @param value - an int specifying the parameter value
     *
     * @throws ParseException which signals that an error has been reached
     *
     * unexpectedly while parsing the parameter name or value.
     *
     */
    protected void setParameter(String name, int value) {
        Integer val = Integer.valueOf(value);
        this.parameters.set(name,val);

    }

    /**
     * Sets the value of the specified parameter. If the parameter already had
     *
     * a value it will be overwritten.
     *
     *
     * @param name - a String specifying the parameter name
     *
     * @param value - a boolean specifying the parameter value
     *
     * @throws ParseException which signals that an error has been reached
     *
     * unexpectedly while parsing the parameter name or value.
     *
     */
    protected void setParameter(String name, boolean value) {
        Boolean val = Boolean.valueOf(value);
        this.parameters.set(name,val);
    }

    /**
     * Sets the value of the specified parameter. If the parameter already had
     *
     * a value it will be overwritten.
     *
     * @param name - a String specifying the parameter name
     *
     * @param value - a boolean specifying the parameter value
     *
     * @throws ParseException which signals that an error has been reached
     *
     * unexpectedly while parsing the parameter name or value.
     *
     */
    protected void setParameter(String name, float value) {
        Float val = Float.valueOf(value);
        NameValue nv = parameters.getNameValue(name);
        if (nv != null) {
            nv.setValueAsObject(val);
        } else {
            nv = new NameValue(name, val);
            this.parameters.set(nv);
        }
    }

    /**
     * Sets the value of the specified parameter. If the parameter already had
     *
     * a value it will be overwritten. A zero-length String indicates flag
     *
     * parameter.
     *
     *
     *
     * @param name - a String specifying the parameter name
     *
     * @param value - a String specifying the parameter value
     *
     * @throws ParseException which signals that an error has been reached
     *
     * unexpectedly while parsing the parameter name or value.
     *
     */
    protected void setParameter(String name, Object value) {
        this.parameters.set(name,value);
    }

    /**
     * Return true if has a parameter.
     *
     * @param parameterName is the name of the parameter.
     *
     * @return true if the parameter exists and false if not.
     */
    public boolean hasParameter(String parameterName) {
        return this.parameters.hasNameValue(parameterName);
    }

    /**
     *Remove all parameters.
     */
    public void removeParameters() {
        this.parameters = new NameValueList();
    }

    /**
     * get the parameter list.
     * @return parameter list
     */
    public NameValueList getParameters() {
        return parameters;
    }

    /** Set the parameter given a name and value.
     *
     * @param nameValue - the name value of the parameter to set.
     */
    public void setParameter(NameValue nameValue) {
        this.parameters.set(nameValue);
    }

    /**
     * Set the parameter list.
     *
     * @param parameters The name value list to set as the parameter list.
     */
    public void setParameters(NameValueList parameters) {
        this.parameters = parameters;
    }

    /**
     * Get the parameter as an integer value.
     *
     * @param parameterName -- the parameter name to fetch.
     *
     * @return -1 if the parameter is not defined in the header.
     */
    protected int getParameterAsInt(String parameterName) {
        if (this.getParameterValue(parameterName) != null) {
            try {
                if (this.getParameterValue(parameterName) instanceof String) {
                    return Integer.parseInt(this.getParameter(parameterName));
                } else {
                    return ((Integer) getParameterValue(parameterName))
                        .intValue();
                }
            } catch (NumberFormatException ex) {
                return -1;
            }
        } else
            return -1;
    }

    /** Get the parameter as an integer when it is entered as a hex.
     *
     *@param parameterName -- The parameter name to fetch.
     *
     *@return -1 if the parameter is not defined in the header.
     */
    protected int getParameterAsHexInt(String parameterName) {
        if (this.getParameterValue(parameterName) != null) {
            try {
                if (this.getParameterValue(parameterName) instanceof String) {
                    return Integer.parseInt(
                        this.getParameter(parameterName),
                        16);
                } else {
                    return ((Integer) getParameterValue(parameterName))
                        .intValue();
                }
            } catch (NumberFormatException ex) {
                return -1;
            }
        } else
            return -1;
    }

    /** Get the parameter as a float value.
     *
     *@param parameterName -- the parameter name to fetch
     *
     *@return -1 if the parameter is not defined or the parameter as a float.
     */
    protected float getParameterAsFloat(String parameterName) {

        if (this.getParameterValue(parameterName) != null) {
            try {
                if (this.getParameterValue(parameterName) instanceof String) {
                    return Float.parseFloat(this.getParameter(parameterName));
                } else {
                    return ((Float) getParameterValue(parameterName))
                        .floatValue();
                }
            } catch (NumberFormatException ex) {
                return -1;
            }
        } else
            return -1;
    }

    /**
     * Get the parameter as a long value.
     *
     * @param parameterName -- the parameter name to fetch.
     *
     * @return -1 if the parameter is not defined or the parameter as a long.
     */
    protected long getParameterAsLong(String parameterName) {
        if (this.getParameterValue(parameterName) != null) {
            try {
                if (this.getParameterValue(parameterName) instanceof String) {
                    return Long.parseLong(this.getParameter(parameterName));
                } else {
                    return ((Long) getParameterValue(parameterName))
                        .longValue();
                }
            } catch (NumberFormatException ex) {
                return -1;
            }
        } else
            return -1;
    }

    /**
     * Get the parameter value as a URI.
     *
     * @param parameterName -- the parameter name
     *
     * @return value of the parameter as a URI or null if the parameter
     *  not present.
     */
    protected GenericURI getParameterAsURI(String parameterName) {
        Object val = getParameterValue(parameterName);
        if (val instanceof GenericURI)
            return (GenericURI) val;
        else {
            try {
                return new GenericURI((String) val);
            } catch (ParseException ex) {
                //catch ( URISyntaxException ex) {
                return null;
            }
        }
    }

    /**
     * Get the parameter value as a boolean.
     *
     * @param parameterName -- the parameter name
     * @return boolean value of the parameter.
     */
    protected boolean getParameterAsBoolean(String parameterName) {
        Object val = getParameterValue(parameterName);
        if (val == null) {
            return false;
        } else if (val instanceof Boolean) {
            return ((Boolean) val).booleanValue();
        } else if (val instanceof String) {
            return Boolean.valueOf((String) val).booleanValue();
        } else
            return false;
    }

    /**
     * This is for the benifit of the TCK.
     *
     * @return the name value pair for the given parameter name.
     */
    public NameValue getNameValue(String parameterName) {
        return parameters.getNameValue(parameterName);
    }

 
    public Object clone() {
        ParametersHeader retval = (ParametersHeader) super.clone();
        if (this.parameters != null)
            retval.parameters = (NameValueList) this.parameters.clone();
        return retval;
    }

    //-------------------------
    /**
     * Introduced specifically for the P-Charging-Function-Addresses Header and 
     * all other headers that may have multiple header parameters of the same name, but 
     * with multiple possible values.
     * 
     * Example: P-Charging-Function-Addresses: ccf=[5555::b99:c88:d77:e66]; ccf=[5555::a55:b44:c33:d22]; 
     *                                         ecf=[5555::1ff:2ee:3dd:4cc]; ecf=[5555::6aa:7bb:8cc:9dd]
     * @param name of the parameter
     * @param value of the parameter
     */
    public void setMultiParameter(String name, String value)
    {
    	NameValue nv = new NameValue();
    	nv.setName(name);
    	nv.setValue(value);
    	duplicates.set(nv);
    }
    
    /** Set the parameter given a name and value.
    *
    * @param nameValue - the name value of the parameter to set.
    */
   public void setMultiParameter(NameValue nameValue) {
       this.duplicates.set(nameValue);
   }
    
    /**
     * Returns the parameter name
     * @param name
     * @return
     */
    public String getMultiParameter(String name) {
        return this.duplicates.getParameter(name);

    }
    

    public DuplicateNameValueList getMultiParameters() {
        return duplicates;
    }
    
    
    /**
     * Return the parameter as an object (dont convert to string).
     *
     * @param name is the name of the parameter to get.
     * @return the object associated with the name.
     */
    public Object getMultiParameterValue(String name) {
        return this.duplicates.getValue(name);
    }

    /**
     * Returns an Iterator over the names (Strings) of all parameters present
     * in this ParametersHeader.
     *
     * @return an Iterator over all the parameter names
     */

    public Iterator<String> getMultiParameterNames() {
        return duplicates.getNames();
    }

    /** Return true if you have a parameter and false otherwise.
     *
     *@return true if the parameters list is non-empty.
     */

    public boolean hasMultiParameters() {
        return duplicates != null && !duplicates.isEmpty();
    }

    /**
    * Removes the specified parameter from Parameters of this ParametersHeader.
    * This method returns silently if the parameter is not part of the
    * ParametersHeader.
    *
    * @param name - a String specifying the parameter name
    */

    public void removeMultiParameter(String name) {
        this.duplicates.delete(name);
    }
    
    /**
     * Return true if has a parameter.
     *
     * @param parameterName is the name of the parameter.
     *
     * @return true if the parameter exists and false if not.
     */
    public boolean hasMultiParameter(String parameterName) {
        return this.duplicates.hasNameValue(parameterName);
    }

    /**
     *Remove all parameters.
     */
    public void removeMultiParameters() {
        this.duplicates = new DuplicateNameValueList();
    }

    //-------------------------------
    
    @SuppressWarnings("unchecked")
    protected final boolean equalParameters( Parameters other ) {
        if (this==other) return true;

        for ( Iterator i = this.getParameterNames(); i.hasNext();) {
            String pname = (String) i.next();

            String p1 = this.getParameter( pname );
            String p2 = other.getParameter( pname );

            // getting them based on this.getParameterNames. Note that p1 may be null
            // if this is a name-only parameter like rport or lr.
            if (p1 == null ^ p2 == null) return false;
            else if (p1 != null && !p1.equalsIgnoreCase(p2) ) return false;
        }

        // Also compare other's parameters; some duplicate testing here...
        for ( Iterator i = other.getParameterNames(); i.hasNext();) {
            String pname = (String) i.next();

            String p1 = other.getParameter( pname );
            String p2 = this.getParameter( pname );

                // assert( p1 != null );
            // if ( p1 == null ) throw new RuntimeException("Assertion check failed!");
            // if (p2==null) return false;

            // getting them based on this.getParameterNames. Note that p1 may be null
            // if this is a name-only parameter like rport or lr.

            if (p1 == null ^ p2 == null) return false;
            else if (p1 != null && !p1.equalsIgnoreCase(p2) ) return false;
        }

        return true;
    }
    
    
    // ----------- Abstract methods --------------
    protected abstract String encodeBody();

}