tagattributeinfo.java

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/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999 The Apache Software Foundation.  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. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
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 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:  
 *       "This product includes software developed by the 
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
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 *    Foundation" must not be used to endorse or promote products derived
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 * 5. Products derived from this software may not be called "Apache"
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 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
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 */ 
 
package javax.servlet.jsp.tagext;

/**
 * Information on Tag Attributes;
 * this class is instantiated from the Tag Library Descriptor file (TLD).
 *
 * Only the information needed to generate code is included here.  Other information
 * like SCHEMA for validation belongs elsewhere.
 */

public class TagAttributeInfo {
    /**
     * "id" is wired in to be ID.  There is no real benefit in having it be something else
     * IDREFs are not handled any differently.
     */

    public static final String ID = "id";

    /**
     * Constructor for TagAttributeInfo.
     * No public constructor; this class is to be instantiated only from the
     * TagLibrary code under request from some JSP code that is parsing a
     * TLD (Tag Library Descriptor).
     *
     * @param name The name of the attribute
     * @param type The name of the type of the attribute
     * @param reqTime Can this attribute hold a request-time Attribute
     */
    // TODO -- add the content descriptor...

    public TagAttributeInfo(String name, boolean required,
                            String type, boolean reqTime)
    {
	this.name = name;
        this.required = required;
        this.type = type;
	this.reqTime = reqTime;
    }

    /**
     * @returns the name of the attribute
     */

    public String getName() {
	return name;
    }

    /**
     * @returns the type of the attribute
     */

    public String getTypeName() {
	return type;
    }

    /**
     * Can this attribute hold a request-time value?
     */

    public boolean canBeRequestTime() {
	return reqTime;
    }

    /**
     * Is this required or not?
     */
    public boolean isRequired() {
        return required;
    }

    /**
     * Convenience method that goes through an array of TagAttributeInfo
     * objects and looks for "id".
     */
    public static TagAttributeInfo getIdAttribute(TagAttributeInfo a[]) {
	for (int i=0; i<a.length; i++) {
	    if (a[i].getName().equals(ID)) {
		return a[i];
	    }
	}
	return null;		// no such attribute
    }

    public String toString() {
        StringBuffer b = new StringBuffer();
        b.append("name = "+name+" ");
        b.append("type = "+type+" ");
	b.append("reqTime = "+reqTime+" ");
        b.append("required = "+required+" ");
        return b.toString();
    }

    /*
     * fields
     */

    private String name;
    private String type;
    private boolean reqTime;
    private boolean required;
}