treecolumntag.java

分页查询控件 分页查询控件

/*
 * Copyright 2004 original author or authors.
 *
 * Licensed 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 org.extremecomponents.tree.tag;

import javax.servlet.jsp.JspException;

import org.apache.commons.lang.StringUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.taglibs.standard.lang.support.ExpressionEvaluatorManager;
import org.extremecomponents.table.bean.Column;
import org.extremecomponents.table.tag.ColumnTag;
import org.extremecomponents.table.tag.TableTag;
import org.extremecomponents.tree.bean.TreeNode;
import org.extremecomponents.tree.core.TreeModel;
import org.extremecomponents.util.ExceptionUtils;

/**
 * @jsp.tag name="treecolumn" display-name="TreeColumnTag" body-content="JSP"
 *          description="The container which holds all the column specific
 *          information. A copy of each column will be fed to the Model."
 * 
 * @author phorn
 */
public class TreeColumnTag extends ColumnTag {
    private static final long serialVersionUID = -2134703529160375990L;
    private static Log logger = LogFactory.getLog(TreeColumnTag.class);

    public static final String NO_PROPERTY_SPECIFIED = "NO_PROPERTY_SPECIFIED";
    public static final String CELL = "tree";

    private Object extendedValue;

    /**
     * @jsp.attribute description="The value for the column. Typically this will
     *                be the value of the property attribute. If the value
     *                attribute is not specifed then it will be retrieved
     *                automatically by using the property attribute."
     *                required="false" rtexprvalue="true"
     */
    public Object getExtendedValue() {
        return extendedValue;
    }

    public void setExtendedValue(Object extendedValue) {
        this.extendedValue = extendedValue;
    }

    /**
     * Get the value for the column. First look to see if it displayed in the
     * body of the column. If it is not in the body, then use the value
     * attribute. If the value attribute is not specified then use the property
     * attribute to find the value in the bean.
     */
    public void setColumnValue()
            throws JspException {
        logger.debug("TreeColumnTag.setColumnValue()");

        TableTag tableTag;
        try {
            tableTag = (TableTag) findAncestorWithClass(this, TableTag.class);

            if (tableTag.getRowCount() == 0) {
                //not going through the body for content yet...skip the first pass through
                return;
            }

            if (this.bodyContent != null) {
                //have a body
                setExtendedValue(getBodyContent().getString());
            }

            if (getExtendedValue() != null) {
                setExtendedValue((Object) ExpressionEvaluatorManager.evaluate("value", getExtendedValue().toString(),
                        Object.class, this, pageContext));
            }

            TreeModel model = (TreeModel) tableTag.getModel();
            model.setExtendedValue((String) getExtendedValue());
            TreeNode node = (TreeNode) pageContext.getAttribute(tableTag.getCollection());
            setValue(node);
        } catch (Exception e) {
            logger.error("TreeColumnTag.setColumnValue() Problem", e);
            throw new JspException("TreeColumnTag.setColumnValue() Problem " + ExceptionUtils.formatStackTrace(e));
        }
    }

    /**
     * Must make a copy of the column because this tag may be reused. Send the
     * copy up to the Model.
     */
    public int doEndTag()
            throws JspException {
        logger.debug("TreeColumnTag.doEndTag()");

        try {
            TreeTag treeTag = (TreeTag) findAncestorWithClass(this, TableTag.class);

            if (StringUtils.isBlank(getProperty()))
                setProperty(NO_PROPERTY_SPECIFIED);

            if (treeTag.isIteratingBody()) {
                setColumnValue();
                treeTag.addColumnValue(getProperty(), getValue(), getColumnPropertyValue());
            } else {
                Column column = new Column();
                
                if (NO_PROPERTY_SPECIFIED.equals(getProperty())) {
                    if (StringUtils.isBlank(getTitle())) {
                        column.addAttribute(Column.TITLE, " ");
                    }
                    else {
                        column.addAttribute(Column.TITLE, getTitle());
                    }
                    column.addAttribute(Column.FILTERABLE, "false");
                    column.addAttribute(Column.SORTABLE, "false");
                    column.addAttribute(Column.PROPERTY, NO_PROPERTY_SPECIFIED);
                } else {
                    column.addAttribute(Column.PROPERTY, getProperty());
                    column.addAttribute(Column.TITLE, getTitle());
                    column.addAttribute(Column.FILTERABLE, getFilterable());
                    column.addAttribute(Column.SORTABLE, getSortable());
                }

                column.addAttribute(Column.VALUE, getValue());
                column.addAttribute(Column.STYLE_CLASS, getStyleClass());
                column.addAttribute(Column.HEADER_CLASS, getHeaderClass());
                column.addAttribute(Column.CELL, CELL);
                column.addAttribute(Column.HEADER_CELL, getHeaderCell());
                column.addAttribute(Column.FORMAT, getFormat());
                column.addAttribute(Column.PARSE, getParse());
                column.addAttribute(Column.WIDTH, getWidth());
                column.addAttribute(Column.STYLE, getStyle());
                column.addAttribute(Column.EXPORTABLE, getExportable());
                column.addAttribute(Column.FILTER_CELL, getFilterCell());
                column.addAttribute(Column.SHOW_TOTAL, getShowTotal());
                addExtendedAttributes(column);
                treeTag.addColumn(column);
            }
        } catch (Exception e) {
            throw new JspException("TreeColumnTag.doEndTag() Problem: " + ExceptionUtils.formatStackTrace(e));
        }

        setBodyContent(null);

        return EVAL_PAGE;
    }

    public void release() {
        super.release();
    }

}