/*
 * @(#)BagFunction.java
 *
 * Copyright 2003-2004 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistribution of source code must retain the above copyright notice,
 *      this list of conditions and the following disclaimer.
 * 
 *   2. Redistribution in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * Neither the name of Sun Microsystems, Inc. or the names of contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 * 
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
 * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
 * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MICROSYSTEMS, INC. ("SUN")
 * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
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package com.sun.xacml.cond;

import com.sun.xacml.attr.AnyURIAttribute;
import com.sun.xacml.attr.Base64BinaryAttribute;
import com.sun.xacml.attr.BooleanAttribute;
import com.sun.xacml.attr.DateAttribute;
import com.sun.xacml.attr.DateTimeAttribute;
import com.sun.xacml.attr.DayTimeDurationAttribute;
import com.sun.xacml.attr.DoubleAttribute;
import com.sun.xacml.attr.HexBinaryAttribute;
import com.sun.xacml.attr.IntegerAttribute;
import com.sun.xacml.attr.RFC822NameAttribute;
import com.sun.xacml.attr.StringAttribute;
import com.sun.xacml.attr.TimeAttribute;
import com.sun.xacml.attr.X500NameAttribute;
import com.sun.xacml.attr.YearMonthDurationAttribute;

import java.util.HashSet;
import java.util.Set;


/**
 * Represents all of the Bag functions, though the actual implementations
 * are in two sub-classes specific to the condition and general bag
 * functions.
 *
 * @since 1.0
 * @author Seth Proctor
 */
public abstract class BagFunction extends FunctionBase
{

    /**
     * Base name for the type-one-and-only funtions. To get the standard
     * identifier for a given type, use <code>FunctionBase.FUNCTION_NS</code>
     * + the datatype's base name (e.g., <code>string</code>) +
     * </code>NAME_BASE_ONE_AND_ONLY</code>.
     */
    public static final String NAME_BASE_ONE_AND_ONLY =
        "-one-and-only";

    /**
     * Base name for the type-bag-size funtions. To get the standard
     * identifier for a given type, use <code>FunctionBase.FUNCTION_NS</code>
     * + the datatype's base name (e.g., <code>string</code>) +
     * </code>NAME_BASE_BAG_SIZE</code>.
     */
    public static final String NAME_BASE_BAG_SIZE =
        "-bag-size";

    /**
     * Base name for the type-is-in. To get the standard
     * identifier for a given type, use <code>FunctionBase.FUNCTION_NS</code>
     * + the datatype's base name (e.g., <code>string</code>) +
     * </code>NAME_BASE_IS_IN</code>.
     */
    public static final String NAME_BASE_IS_IN =
        "-is-in";

    /**
     * Base name for the type-bag funtions. To get the standard
     * identifier for a given type, use <code>FunctionBase.FUNCTION_NS</code>
     * + the datatype's base name (e.g., <code>string</code>) +
     * </code>NAME_BASE_BAG</code>.
     */
    public static final String NAME_BASE_BAG =
        "-bag";

    // bag parameter info for the functions that accept multiple args
    private static final boolean bagParams [] = { false, true };

    /**
     * A complete list of all the XACML datatypes supported by the Bag
     * functions
     */
    protected static String baseTypes [] = {
        StringAttribute.identifier,
        BooleanAttribute.identifier,
        IntegerAttribute.identifier,
        DoubleAttribute.identifier,
        DateAttribute.identifier,
        DateTimeAttribute.identifier,
        TimeAttribute.identifier,
        AnyURIAttribute.identifier,
        HexBinaryAttribute.identifier,
        Base64BinaryAttribute.identifier,
        DayTimeDurationAttribute.identifier,
        YearMonthDurationAttribute.identifier,
        X500NameAttribute.identifier,
        RFC822NameAttribute.identifier
    };

    /**
     * A complete list of all the XACML datatypes supported by the Bag
     * functions, using the "simple" form of the names (eg, string
     * instead of http://www.w3.org/2001/XMLSchema#string)
     */
    protected static String simpleTypes [] = {
        "string", "boolean", "integer", "double", "date", "dateTime",
        "time", "anyURI", "hexBinary", "base64Binary", "dayTimeDuration",
        "yearMonthDuration", "x500Name", "rfc822Name"
    };

    /**
     * Returns a new <code>BagFunction</code> that provides the
     * type-one-and-only functionality over the given attribute type.
     * This should be used to create new function instances for any new
     * attribute types, and the resulting object should be put into
     * the <code>FunctionFactory</code> (instances already exist in the
     * factory for the standard attribute types).
     *
     * @param functionName the name to use for the function
     * @param argumentType the type to operate on
     *
     * @return a new <code>BagFunction</code>
     */
    public static BagFunction getOneAndOnlyInstance(String functionName,
                                                    String argumentType) {
        return new GeneralBagFunction(functionName, argumentType,
                                      NAME_BASE_ONE_AND_ONLY);
    }

    /**
     * Returns a new <code>BagFunction</code> that provides the
     * type-bag-size functionality over the given attribute type. This
     * should be used to create new function instances for any new
     * attribute types, and the resulting object should be put into
     * the <code>FunctionFactory</code> (instances already exist in the
     * factory for the standard attribute types).
     *
     * @param functionName the name to use for the function
     * @param argumentType the type to operate on
     *
     * @return a new <code>BagFunction</code>
     */
    public static BagFunction getBagSizeInstance(String functionName,
                                                 String argumentType) {
        return new GeneralBagFunction(functionName, argumentType,
                                      NAME_BASE_BAG_SIZE);
    }

    /**
     * Returns a new <code>BagFunction</code> that provides the
     * type-is-in functionality over the given attribute type. This
     * should be used to create new function instances for any new
     * attribute types, and the resulting object should be put into
     * the <code>FunctionFactory</code> (instances already exist in the
     * factory for the standard attribute types).
     *
     * @param functionName the name to use for the function
     * @param argumentType the type to operate on
     *
     * @return a new <code>BagFunction</code>
     */
    public static BagFunction getIsInInstance(String functionName,
                                              String argumentType) {
        return new ConditionBagFunction(functionName, argumentType);
    }

    /**
     * Returns a new <code>BagFunction</code> that provides the
     * type-bag functionality over the given attribute type. This
     * should be used to create new function instances for any new
     * attribute types, and the resulting object should be put into
     * the <code>FunctionFactory</code> (instances already exist in the
     * factory for the standard attribute types).
     *
     * @param functionName the name to use for the function
     * @param argumentType the type to operate on
     *
     * @return a new <code>BagFunction</code>
     */
    public static BagFunction getBagInstance(String functionName,
                                             String argumentType) {
        return new GeneralBagFunction(functionName, argumentType,
                                      NAME_BASE_BAG);
    }

    /**
     * Protected constuctor used by the general and condition subclasses
     * to create a non-boolean function with parameters of the same datatype.
     * If you need to create a new <code>BagFunction</code> instance you
     * should either use one of the <code>getInstance</code> methods or
     * construct one of the sub-classes directly.
     *
     * @param functionName the identitifer for the function
     * @param functionId an optional, internal numeric identifier
     * @param paramType the datatype this function accepts
     * @param paramIsBag whether the parameters are bags
     * @param numParams number of parameters allowed or -1 for any number
     * @param returnType the datatype this function returns
     * @param returnsBag whether this function returns bags
     */
    protected BagFunction(String functionName, int functionId,
                          String paramType, boolean paramIsBag, int numParams,
                          String returnType, boolean returnsBag) {
        super(functionName, functionId, paramType, paramIsBag, numParams,
              returnType, returnsBag);
    }

    /**
     * Protected constuctor used by the general and condition subclasses
     * to create a boolean function with parameters of different datatypes.
     * If you need to create a new <code>BagFunction</code> instance you
     * should either use one of the <code>getInstance</code> methods or
     * construct one of the sub-classes directly.
     *
     * @param functionName the identitifer for the function
     * @param functionId an optional, internal numeric identifier
     * @param paramTypes the datatype of each parameter
     */
    protected BagFunction(String functionName, int functionId,
                          String [] paramTypes) {
        super(functionName, functionId, paramTypes, bagParams,
              BooleanAttribute.identifier, false);
    }

    /**
     * Returns a <code>Set</code> containing all the function identifiers
     * supported by this class.
     *
     * @return a <code>Set</code> of <code>String</code>s
     */
    public static Set getSupportedIdentifiers() {
        Set set = new HashSet();

        set.addAll(ConditionBagFunction.getSupportedIdentifiers());
        set.addAll(GeneralBagFunction.getSupportedIdentifiers());

        return set;
    }

}