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Struts example source code file (Attributes.java)

This example Struts source code file (Attributes.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Struts tags/keywords

attributes, attributes, boolean, boolean, linkedhashmap, object, object, string, string, util

The Struts Attributes.java source code

/*
 * $Id: Attributes.java 1076544 2011-03-03 07:19:37Z lukaszlenart $
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.struts2.views.java;

import org.apache.commons.lang.StringEscapeUtils;
import org.apache.commons.lang.StringUtils;

import java.util.LinkedHashMap;

/**
 * Map of tag attributes, used for rendering the tags
 */
public class Attributes extends LinkedHashMap<String, String> {

    private static final long serialVersionUID = 4103241472140545630L; 

    public Attributes add(String key, String value) {
        return add(key, value, true);
    }

    public Attributes add(String key, String value, boolean encode) {
        put(key, (encode ? StringUtils.defaultString(StringEscapeUtils.escapeHtml(value)) : value));
        return this;
    }

    /**
     * Add a key/value pair to the attributes only if the value is not null. Value
     * is html encoded
     * @param attrName attribute name
     * @param paramValue value of attribute
     * @return this
     */
    public Attributes addIfExists(String attrName, Object paramValue) {
        return addIfExists(attrName, paramValue, true);
    }

    /**
     * Add a key/value pair to the attributes only if the value is not null.
     * @param attrName attribute name
     * @param paramValue value of attribute
     * @param encode html encode the value
     * @return this
     */
    public Attributes addIfExists(String attrName, Object paramValue, boolean encode) {
        if (paramValue != null) {
            String val = paramValue.toString();
            if (StringUtils.isNotBlank(val))
                put(attrName, (encode ? StringUtils.defaultString(StringEscapeUtils.escapeHtml(val)) : val));
        }
        return this;
    }

    /**
     * Add a key/value pair to the attributes only if the value is not null and is a boolean with a
     * value of 'true'. Value is html encoded
     * @param attrName attribute name
     * @param paramValue value of attribute
     * @return this
     */
    public Attributes addIfTrue(String attrName, Object paramValue) {
        if (paramValue != null) {
            if ((paramValue instanceof Boolean && ((Boolean) paramValue).booleanValue()) ||
                    (Boolean.valueOf(paramValue.toString()).booleanValue())) {
                put(attrName, attrName);
            }
        }
        return this;
    }

    /**
     * Add a key/value pair to the attributes, if the value is null, it will be set as an empty string.
     * Value is html encoded.
     * @param attrName attribute name
     * @param paramValue value of attribute
     * @return this
     */
    public Attributes addDefaultToEmpty(String attrName, Object paramValue) {
        return addDefaultToEmpty(attrName, paramValue, true);
    }

    /**
     * Add a key/value pair to the attributes, if the value is null, it will be set as an empty string.
     * @param attrName attribute name
     * @param paramValue value of attribute
     * @param encode html encode the value
     * @return this
     */
    public Attributes addDefaultToEmpty(String attrName, Object paramValue, boolean encode) {
        if (paramValue != null) {
            String val = paramValue.toString();
            put(attrName, (encode ? StringUtils.defaultString(StringEscapeUtils.escapeHtml(val)) : val));
        } else {
            put(attrName, "");
        }
        return this;
    }
}

Other Struts examples (source code examples)

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