servletapi/jsr152/src/share/javax/servlet/jsp/tagext/TagAttributeInfo.java

/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements.  See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License.  You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

 
package javax.servlet.jsp.tagext;

/**
 * Information on the attributes of a Tag, available at translation time.
 * This class is instantiated from the Tag Library Descriptor file (TLD).
 *
 * <p>
 * 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.
     * 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 required If this attribute is required in tag instances.
     * @param type The name of the type of the attribute.
     * @param reqTime Whether this attribute holds a request-time Attribute.
     */

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

    /**
     * JSP 2.0 Constructor for TagAttributeInfo.
     * 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 required If this attribute is required in tag instances.
     * @param type The name of the type of the attribute.
     * @param reqTime Whether this attribute holds a request-time Attribute.
     * @param fragment Whether this attribute is of type JspFragment
     *
     * @since 2.0
     */

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

    /**
     * The name of this attribute.
     *
     * @return the name of the attribute
     */

    public String getName() {
	return name;
    }

    /**
     * The type (as a String) of this attribute.
     *
     * @return the type of the attribute
     */

    public String getTypeName() {
	return type;
    }

    /**
     * Whether this attribute can hold a request-time value.
     *
     * @return if the attribute can hold a request-time value.
     */

    public boolean canBeRequestTime() {
	return reqTime;
    }

    /**
     * Whether this attribute is required.
     *
     * @return if the attribute is required.
     */
    public boolean isRequired() {
        return required;
    }

    /**
     * Convenience static method that goes through an array of TagAttributeInfo
     * objects and looks for "id".
     *
     * @param a An array of TagAttributeInfo
     * @return The TagAttributeInfo reference with name "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
    }

    /**
     * Whether this attribute is of type JspFragment.
     *
     * @return if the attribute is of type JspFragment
     *
     * @since 2.0
     */
    public boolean isFragment() {
	return fragment;
    }


    
    /**
     * Returns a String representation of this TagAttributeInfo, suitable
     * for debugging purposes.
     *
     * @return a String representation of this TagAttributeInfo
     */
    public String toString() {
        StringBuffer b = new StringBuffer();
        b.append("name = "+name+" ");
        b.append("type = "+type+" ");
	b.append("reqTime = "+reqTime+" ");
        b.append("required = "+required+" ");
        b.append("fragment = "+fragment+" ");
        return b.toString();
    }

    /*
     * private fields
     */
    private String name;
    private String type;
    private boolean reqTime;
    private boolean required;

    /*
     * private fields for JSP 2.0
     */
    private boolean fragment;
}