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package com.opensymphony.webwork.components;

import com.opensymphony.xwork.util.OgnlValueStack;

import java.io.Writer;

/**
 * 
 *
 * Perform basic condition flow. 'If' tag could be used by itself or
 * with 'Else If' Tag and/or single/multiple 'Else' Tag.
 *
 * 
 *
 *
 * 
 *
 * 
 *
 *  test* (Boolean) - Logic to determined if body of tag is to be displayed
 *
 * 
 *
 * 
 *
 *
 *  * 
 *  <ww:if test="%{false}">
 *	    <div>Will Not Be Executed</div>
 *  </ww:if>
 * 	<ww:elseif test="%{true}">
 *	    <div>Will Be Executed</div>
 *  </ww:elseif>
 *  <ww:else>
 *	    <div>Will Not Be Executed</div>
 *  </ww:else>
 * 
 * 
 *
 * @author tmjee
 *
 * @see Else
 * @see ElseIf
 *
 * @ww.tag name="if" tld-body-content="JSP" description="If tag" tld-tag-class="com.opensymphony.webwork.views.jsp.IfTag"
 */
public class If extends Component {
    public static final String ANSWER = "webwork.if.answer";

    Boolean answer;
    String test;

    /**
     * Expression to determine if body of tag is to be displayed
     * @ww.tagattribute required="true" type="Boolean"
     */
    public void setTest(String test) {
        this.test = test;
    }

    public If(OgnlValueStack stack) {
        super(stack);
    }

    public boolean start(Writer writer) {
        answer = (Boolean) findValue(test, Boolean.class);

        if (answer == null) {
            answer = Boolean.FALSE;
        }

        stack.getContext().put(ANSWER, answer);
        
        return answer.booleanValue();
    }

    public boolean end(Writer writer, String body) {
        return super.end(writer, body);
    }
}