buttontag.java

网上购物系统

// =========================================================
// 项目：嘉兴市民健康信息系统
// 路径：$Archive: $
// =========================================================
package cn.gov.jiaxing.health.common.taglib;

import java.sql.SQLException;

import javax.servlet.jsp.JspException;

import org.apache.commons.lang.StringUtils;
import org.apache.struts.taglib.TagUtils;

import com.shsafe.common.util.JavaScriptUtil;

import cn.gov.jiaxing.health.common.dto.UserDTO;
import cn.gov.jiaxing.health.common.securitymanager.SecurityManager;

/**
 * 实现权限控制的按钮标签类。<br>
 * 如果没有权限实现某种操作，则不显示此按钮
 * 
 * @author $Author: Jisj$
 * @version $Revision: $ $Date: $
 */
public class ButtonTag extends org.apache.struts.taglib.html.ButtonTag {

	/** serialVersionUID */
	private static final long serialVersionUID = 165198465L;

	/** 进入权限常量值 */
	private static final int ENTRY = 0;

	/** 检索权限常量值 */
	private static final int SEARCH = 1;

	/** 插入权限常量值 */
	private static final int INSERT = 2;

	/** 更新权限常量值 */
	private static final int UPDATE = 3;

	/** 删除权限常量值 */
	private static final int DELETE = 4;

	/** 上传权限常量值 */
	private static final int UPLOAD = 5;

	/** 下载权限常量值 */
	private static final int DOWNLOAD = 6;

	/** 审核权限常量值 */
	private static final int AUDIT = 7;

	/** 保存权限常量值 */
	private static final int SAVE = 8;

	private boolean isDisplay = false;

	/**
	 * 设置是否显示Button的字符串
	 */
	private String dispNone = "";

	/**
	 * The type of button, such as "Search", "update", "delete", "insert",
	 * "upload", "download"
	 */
	private String type = null;

	/**
	 * 是否是submit按钮
	 */
	private String submit = null;

	/**
	 * 是否是reset按钮
	 */
	private String reset = null;

	/**
	 * 是否是file按钮
	 */
	private String isFileButton = null;

	/**
	 * 判断标签库生成代码是否是在JavaScript的字符串中。
	 */
	private boolean inJavaScript = false;

	/**
	 * 可操作的类型
	 */
	protected static final String[] TYPES = { "Entry", "Search", "Insert",
			"Update", "Delete", "Upload", "Download", "Audit", "Save", };

	/**
	 * @see javax.servlet.jsp.tagext.Tag#doStartTag()
	 */
	@Override
	public int doStartTag() throws JspException {
		dispNone = "";
		return super.doStartTag();
	}


	/**
	 * Process the end of this tag.
	 * <p>
	 * Support for Indexed property since Struts 1.1
	 * 
	 * @return <code>EVAL_PAGE</code>
	 * @exception JspException
	 *                if a JSP exception has occurred
	 */
	public int doEndTag() throws JspException {

		// Generate an HTML element
		StringBuffer results = new StringBuffer();
		results.append(getElementOpen());
		prepareAttribute(results, "name", prepareName());
		prepareButtonAttributes(results);
		results.append(prepareEventHandlers());
		results.append(prepareStyles());
		prepareOtherAttributes(results);
		results.append(getElementClose());

		String html = results.toString();
		if (isInJavaScript()) {
			html = JavaScriptUtil.escape(html);
		}

		TagUtils.getInstance().write(pageContext, html);
		if (isDisplay && text != null && !StringUtils.isEmpty(value)) {
			TagUtils.getInstance().write(pageContext, text);
		}

		return (EVAL_PAGE);

	}

	/**
	 * Release
	 * 
	 * @see org.apache.struts.taglib.html.SubmitTag#release()
	 */
	@Override
	public void release() {
		this.isDisplay = false;
		this.inJavaScript = false;
		this.dispNone = null;
		this.submit = null;
		this.reset = null;
		super.release();
	}

	/**
	 * Returns the style attribute.
	 * 
	 * @see org.apache.struts.taglib.html.BaseHandlerTag#getStyle()
	 */
	@Override
	public String getStyle() {
		// if authority is limited, then set style with "display:none"
		UserDTO userDto = (UserDTO) pageContext.getSession().getAttribute(
				UserDTO.SESSION_KEY);
		SecurityManager securityManager = null;
		try {
			securityManager = new SecurityManager(userDto);
		} catch (SQLException e) {
			throw new NullPointerException("Connection Error" + e);
		}

		// 判断选择的菜单ID
		int selectType = 0;
		String menuId = userDto.getCurrMenuId();
		for (int i = 0; i < TYPES.length; i++) {
			if (type.equalsIgnoreCase(TYPES[i])) {
				selectType = i;
				break;
			}
		}

		// 根据Button类型判断是否显示
		isDisplay = canDisp(securityManager, selectType, menuId);

		if (!isDisplay) {
			dispNone = "display:none";
		}

		if (StringUtils.isEmpty(super.getStyle())) {
			dispNone = ";" + dispNone;
		}

		return super.getStyle() + dispNone;
	}

	private boolean canDisp(SecurityManager securityManager,
			int authorityConst, String menuId) {
		switch (authorityConst) {
		case ENTRY:
			// 测试是否有检索权限
			return securityManager.canEntry(menuId);
		case SEARCH:
			// 测试是否有检索权限
			return securityManager.canSearch(menuId);
		case INSERT:
			// 测试是否有检索权限
			return securityManager.canInsert(menuId);
		case UPDATE:
			// 测试是否有更新权限
			return securityManager.canUpdate(menuId);
		case DELETE:
			// 测试是否有删除权限
			return securityManager.canDelete(menuId);
		case UPLOAD:
			// 测试是否有插入权限
			return securityManager.canUpdate(menuId);
		case DOWNLOAD:
			// 测试是否有上传权限
			return securityManager.canDownload(menuId);
		case AUDIT:
			// 测试是否有下载权限
			return securityManager.canAudit(menuId);
		case SAVE:
			// 测试是否有保存权限
			return securityManager.canInsert(menuId)
					|| securityManager.canUpdate(menuId);
		default:
			return false;
		}

	}

	/**
	 * Render the opening element.
	 * 
	 * @return The opening part of the element.
	 */
	protected String getElementOpen() {
		if (StringUtils.equalsIgnoreCase(getSubmit(), "true")) {
			return "<input type=\"submit\"";
		}
		if (StringUtils.equalsIgnoreCase(getReset(), "true")) {
			return "<input type=\"reset\"";
		}
		if (StringUtils.equalsIgnoreCase(getIsFileButton(), "true")) {
			return "<input type=\"file\"";
		}
		return "<input type=\"button\"";
	}

	/**
	 * 返回<code>type</code>的值。
	 * 
	 * @return <code>type</code>的值
	 */
	public String getType() {
		return type;
	}

	/**
	 * 设置字段<codSe>type</code>的值。
	 * 
	 * @param type
	 *            要设置的<code>type<code>字段的新值
	 */
	public void setType(String type) {
		this.type = type;
	}

	/**
	 * 返回<code>inJavaScript</code>的值。
	 * 
	 * @return <code>inJavaScript</code>的值
	 */
	public boolean isInJavaScript() {
		return inJavaScript;
	}

	/**
	 * 设置字段<code>inJavaScript</code>的值。
	 * 
	 * @param inJavaScript
	 *            要设置的<code>inJavaScript<code>字段的新值
	 */
	public void setInJavaScript(boolean inJavaScript) {
		this.inJavaScript = inJavaScript;
	}

	/**
	 * 返回<code>submit</code>的值。
	 * 
	 * @return <code>submit</code>的值
	 */
	public String getSubmit() {
		return submit;
	}

	/**
	 * 设置字段<code>submit</code>的值。
	 * 
	 * @param submit
	 *            要设置的<code>submit<code>字段的新值
	 */
	public void setSubmit(String submit) {
		this.submit = submit;
	}

	/**
	 * 返回<code>reset</code>的值。
	 * 
	 * @return <code>reset</code>的值
	 */
	public String getReset() {
		return reset;
	}

	/**
	 * 设置字段<code>reset</code>的值。
	 * 
	 * @param reset
	 *            要设置的<code>reset<code>字段的新值
	 */
	public void setReset(String reset) {
		this.reset = reset;
	}

	/**
	 * 返回<code>isFileButton</code>的值。
	 * 
	 * @return <code>isFileButton</code>的值
	 */
	public String getIsFileButton() {
		return isFileButton;
	}

	/**
	 * 设置字段<code>isFileButton</code>的值。
	 * 
	 * @param isFileButton
	 *            要设置的<code>isFileButton<code>字段的新值
	 */
	public void setIsFileButton(String isFileButton) {
		this.isFileButton = isFileButton;
	}
}