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/*
 * The contents of this file are subject to the terms
 * of the Common Development and Distribution License
 * (the "License").  You may not use this file except
 * in compliance with the License.
 *
 * You can obtain a copy of the license at
 * glassfish/bootstrap/legal/CDDLv1.0.txt or
 * https://glassfish.dev.java.net/public/CDDLv1.0.html.
 * See the License for the specific language governing
 * permissions and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL
 * HEADER in each file and include the License file at
 * glassfish/bootstrap/legal/CDDLv1.0.txt.  If applicable,
 * add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your
 * own identifying information: Portions Copyright [yyyy]
 * [name of copyright owner]
 *
 * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
 *
 * Portions Copyright Apache Software Foundation.
 */ 

package org.apache.taglibs.standard.tag.el.fmt;

import java.util.Locale;

import javax.servlet.jsp.JspException;

import org.apache.taglibs.standard.lang.support.ExpressionEvaluatorManager;
import org.apache.taglibs.standard.tag.common.fmt.ParseDateSupport;
import org.apache.taglibs.standard.tag.common.fmt.SetLocaleSupport;

/**
 * A handler for <parseDate> that accepts attributes as Strings
 * and evaluates them as expressions at runtime.
 *
 * @author Jan Luehe
 */

public class ParseDateTag extends ParseDateSupport {

    //*********************************************************************
    // 'Private' state (implementation details)

    private String value_;                       // stores EL-based property
    private String type_;                        // stores EL-based property
    private String dateStyle_;		         // stores EL-based property
    private String timeStyle_;		         // stores EL-based property
    private String pattern_;		         // stores EL-based property
    private String timeZone_;		         // stores EL-based property
    private String parseLocale_;	         // stores EL-based property


    //*********************************************************************
    // Constructor

    /**
     * Constructs a new ParseDateTag.  As with TagSupport, subclasses
     * should not provide other constructors and are expected to call
     * the superclass constructor
     */
    public ParseDateTag() {
        super();
        init();
    }


    //*********************************************************************
    // Tag logic

    // evaluates expression and chains to parent
    public int doStartTag() throws JspException {

        // evaluate any expressions we were passed, once per invocation
        evaluateExpressions();

	// chain to the parent implementation
	return super.doStartTag();
    }

    // Releases any resources we may have (or inherit)
    public void release() {
        super.release();
        init();
    }


    //*********************************************************************
    // Accessor methods

    // for EL-based attribute
    public void setValue(String value_) {
        this.value_ = value_;
	this.valueSpecified = true;
    }

    // for EL-based attribute
    public void setType(String type_) {
        this.type_ = type_;
    }

    // for EL-based attribute
    public void setDateStyle(String dateStyle_) {
        this.dateStyle_ = dateStyle_;
    }

    // for EL-based attribute
    public void setTimeStyle(String timeStyle_) {
        this.timeStyle_ = timeStyle_;
    }

    // for EL-based attribute
    public void setPattern(String pattern_) {
        this.pattern_ = pattern_;
    }

    // for EL-based attribute
    public void setTimeZone(String timeZone_) {
        this.timeZone_ = timeZone_;
    }

    // for EL-based attribute
    public void setParseLocale(String parseLocale_) {
        this.parseLocale_ = parseLocale_;
    }


    //*********************************************************************
    // Private (utility) methods

    // (re)initializes state (during release() or construction)
    private void init() {
        // null implies "no expression"
	value_ = type_ = dateStyle_ = timeStyle_ = pattern_ = timeZone_ = null;
	parseLocale_ = null;
    }

    // Evaluates expressions as necessary
    private void evaluateExpressions() throws JspException {
        /* 
         * Note: we don't check for type mismatches here; we assume
         * the expression evaluator will return the expected type
         * (by virtue of knowledge we give it about what that type is).
         * A ClassCastException here is truly unexpected, so we let it
         * propagate up.
         */

	// 'value' attribute
	if (value_ != null) {
	    value = (String) ExpressionEvaluatorManager.evaluate(
	        "value", value_, String.class, this, pageContext);
	}

	// 'type' attribute
	if (type_ != null) {
	    type = (String) ExpressionEvaluatorManager.evaluate(
	        "type", type_, String.class, this, pageContext);
	}

	// 'dateStyle' attribute
	if (dateStyle_ != null) {
	    dateStyle = (String) ExpressionEvaluatorManager.evaluate(
	        "dateStyle", dateStyle_, String.class, this, pageContext);
	}

	// 'timeStyle' attribute
	if (timeStyle_ != null) {
	    timeStyle = (String) ExpressionEvaluatorManager.evaluate(
	        "timeStyle", timeStyle_, String.class, this, pageContext);
	}

	// 'pattern' attribute
	if (pattern_ != null) {
	    pattern = (String) ExpressionEvaluatorManager.evaluate(
	        "pattern", pattern_, String.class, this, pageContext);
	}

	// 'timeZone' attribute
	if (timeZone_ != null) {
	    timeZone = ExpressionEvaluatorManager.evaluate(
	        "timeZone", timeZone_, Object.class, this, pageContext);
	}

	// 'parseLocale' attribute
	if (parseLocale_ != null) {
	    Object obj = ExpressionEvaluatorManager.evaluate(
	        "parseLocale", parseLocale_, Object.class, this, pageContext);
	    if (obj != null) {
		if (obj instanceof Locale) {
		    parseLocale = (Locale) obj;
		} else {
		    String localeStr = (String) obj;
		    if (!"".equals(localeStr)) {
			parseLocale = SetLocaleSupport.parseLocale(localeStr);
		    }
		}
	    }
	}
    }
}