iteratetag.java

这是一个轻便的j2ee的web应用框架,是一个在多个项目中运用的实际框架,采用struts,hebinate,xml等技术,有丰富的tag,role,navigation,session,dictio

/*
 * $Header: /sfroot/cvs/esimple/src/core/com/esimple/framework/web/taglib/logic/IterateTag.java,v 1.1.1.1 2004/09/08 06:38:20 lava Exp $
 * $Revision: 1.1.1.1 $
 * $Date: 2004/09/08 06:38:20 $
 *
 * ====================================================================
 *
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999-2003 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.
 *
 * 2. Redistributions 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.
 *
 * 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.
 *
 * 4. The names "The Jakarta Project", "Struts", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact [e-mail].
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package com.esimple.framework.web.taglib.logic;

import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.Map;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.BodyTagSupport;

import org.apache.commons.collections.IteratorUtils;
import org.apache.struts.util.MessageResources;
import org.apache.struts.util.RequestUtils;
import org.apache.struts.util.ResponseUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
 * Custom tag that iterates the elements of a collection, which can be
 * either an attribute or the property of an attribute.  The collection
 * can be any of the following:  an array of objects, an Enumeration,
 * an Iterator, a Collection (which includes Lists, Sets and Vectors),
 * or a Map (which includes Hashtables) whose elements will be iterated over.
 *
 * @author Craig R. McClanahan
 * @version $Revision: 1.1.1.1 $ $Date: 2004/09/08 06:38:20 $
 */

public class IterateTag extends BodyTagSupport {

    // ----------------------------------------------------- Instance Variables
	private  Log logger = LogFactory.getLog( IterateTag.class);
    /**
     * Iterator of the elements of this collection, while we are actually
     * running.
     */
    protected Iterator iterator = null;

    /**
     * The number of elements we have already rendered.
     */
    protected int lengthCount = 0;

    /**
     * The actual length value (calculated in the start tag).
     */
    protected int lengthValue = 0;

    /**
     * The message resources for this package.
     */
    protected static MessageResources messages =
        MessageResources.getMessageResources("org.apache.struts.taglib.logic.LocalStrings");

    /**
     * The actual offset value (calculated in the start tag).
     */
    protected int offsetValue = 0;

    /**
     * Has this tag instance been started?
     */
    protected boolean started = false;

    // ------------------------------------------------------------- Properties

    /**
     * The collection over which we will be iterating.
     */
    protected Object collection = null;

    public Object getCollection() {
        return (this.collection);
    }

    public void setCollection(Object collection) {
        this.collection = collection;
    }

    /**
     * The name of the scripting variable to be exposed.
     */
    protected String id = null;

    public String getId() {
        return (this.id);
    }

    public void setId(String id) {
        this.id = id;
    }

    /**
     * <p>Return the zero-relative index of the current iteration through the
     * loop.  If you specify an <code>offset</code>, the first iteration
     * through the loop will have that value; otherwise, the first iteration
     * will return zero.</p>
     *
     * <p>This property is read-only, and gives nested custom tags access to
     * this information.  Therefore, it is <strong>only</strong> valid in
     * between calls to <code>doStartTag()</code> and <code>doEndTag()</code>.
     * </p>
     */
    public int getIndex() {
        if (started)
            return (offsetValue + lengthCount - 1);
        else
            return (0);
    }

    /**
     * The name of the scripting variable to be exposed as the current index.
     */
    protected String indexId = null;

    public String getIndexId() {
        return (this.indexId);
    }

    public void setIndexId(String indexId) {
        this.indexId = indexId;
    }

    /**
     * The length value or attribute name (<=0 means no limit).
     */
    protected String length = null;

    public String getLength() {
        return (this.length);
    }

    public void setLength(String length) {
        this.length = length;
    }

    /**
     * The name of the collection or owning bean.
     */
    protected String name = null;

    public String getName() {
        return (this.name);
    }

    public void setName(String name) {
        this.name = name;
    }

    /**
     * The starting offset (zero relative).
     */
    protected String offset = null;

    public String getOffset() {
        return (this.offset);
    }

    public void setOffset(String offset) {
        this.offset = offset;
    }

    /**
     * The property name containing the collection.
     */
    protected String property = null;

    public String getProperty() {
        return (this.property);
    }

    public void setProperty(String property) {
        this.property = property;
    }

    /**
     * The scope of the bean specified by the name property, if any.
     */
    protected String scope = null;

    public String getScope() {
        return (this.scope);
    }

    public void setScope(String scope) {
        this.scope = scope;
    }

    /**
     * The Java class of each exposed element of the collection.
     */
    protected String type = null;

    public String getType() {
        return (this.type);
    }

    public void setType(String type) {
        this.type = type;
    }

//add by steven
	/**
	 * 最少循环的次数
	 */
	protected String minLength = null;
	private int minLengthValue =-1;
	private int minLengthCount =0;
	public String getMinLength() {
		return (this.minLength);
	}

	public void setMinLength(String minLength) {
		this.minLength = minLength;
	}