001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one
003     * or more contributor license agreements.  See the NOTICE file
004     * distributed with this work for additional information
005     * regarding copyright ownership.  The ASF licenses this file
006     * to you under the Apache License, Version 2.0 (the
007     * "License"); you may not use this file except in compliance
008     * with the License.  You may obtain a copy of the License at
009     *
010     *   http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing,
013     * software distributed under the License is distributed on an
014     * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015     * KIND, either express or implied.  See the License for the
016     * specific language governing permissions and limitations
017     * under the License.
018     */
019    
020    package org.apache.myfaces.tobago.renderkit;
021    
022    import static org.apache.myfaces.tobago.TobagoConstants.ATTR_ONCHANGE;
023    
024    import javax.faces.component.UIComponent;
025    import javax.faces.component.UIInput;
026    import javax.faces.context.FacesContext;
027    
028    public class HtmlUtils {
029    
030      public static final String LAYOUT_ATTRIBUTE_PREFIX = "layout.";
031    
032      public static String generateAttribute(String name, Object value) {
033        String stringValue;
034        if (value == null) {
035          stringValue = null;
036        } else if (value instanceof String) {
037          stringValue = (String) value;
038        } else {
039          stringValue = value.toString();
040        }
041        return (stringValue != null && stringValue.length() > 0)
042            ? name + "=\"" + value + "\""
043            : "";
044      }
045    
046      public static String appendAttribute(UIComponent component, String name,
047          String appendValue) {
048        Object attribute = component.getAttributes().get(name);
049        return attribute != null
050            ? attribute.toString() + " " + appendValue : appendValue;
051      }
052    
053      public static String generateOnchange(UIInput component,
054          FacesContext facesContext) {
055    
056        StringBuilder buffer = new StringBuilder();
057        /*Validator[] validators = component.getValidators();
058        for (int i = 0; i < validators.length; i++) {
059          if (validators[i] instanceof LongRangeValidator) {
060            String functionCall = "validateLongRange('"
061                + component.getClientId(facesContext) + "')";
062            if (LOG.isDebugEnabled()) {
063              LOG.debug("validator functionCall: " + functionCall);
064            }
065            buffer.append(functionCall);
066          } else {
067            buffer.append("true");
068          }
069          if (i + 1 < validators.length) { // is not last
070            buffer.append(" && ");
071          }
072        } */
073    
074        Object onchange = component.getAttributes().get(ATTR_ONCHANGE);
075        if (onchange != null) { // append the onchange attribute
076          if (buffer.length() > 0) {
077            buffer.append(" && ");
078          }
079          buffer.append(onchange);
080        }
081    
082        if (buffer.length() > 0) { // has content ?
083          return buffer.toString();
084        } else {
085          return null;
086        }
087      }
088    
089    }