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JSF components and utilities that can be used with any JSF implementation. This library is based on the JSF1.1 version of Tomahawk, but with minor source code and build changes to take advantage of JSF2.0 features. A JSF2.0 implementation is required to use this version of the Tomahawk library.

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/*
 * 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.myfaces.component.html.util;

import org.apache.commons.lang.builder.EqualsBuilder;
import org.apache.commons.lang.builder.HashCodeBuilder;
import org.apache.myfaces.renderkit.html.util.ResourceHandler;

import javax.faces.FacesException;
import javax.faces.context.FacesContext;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.Iterator;
import java.util.Map;

/**
 * @author Mathias Broekelmann
 *
 */
public class ParameterResourceHandler implements ResourceHandler
{
    private final Map _parameters;
    private final Class _resourceLoaderClass;

    private Integer _hashCode;

    /**
     * @param resourceLoaderClass
     * @param parameters
     */
    public ParameterResourceHandler(Class resourceLoaderClass, Map parameters)
    {
        _resourceLoaderClass = resourceLoaderClass;
        _parameters = parameters;
    }

    /**
     * @see org.apache.myfaces.renderkit.html.util.ResourceHandler#getResourceLoaderClass()
     */
    public Class getResourceLoaderClass()
    {
        return _resourceLoaderClass;
    }

    /**
     * @see org.apache.myfaces.renderkit.html.util.ResourceHandler#getResourceUri(javax.faces.context.FacesContext)
     */
    public String getResourceUri(FacesContext context)
    {
        if (_parameters != null && !_parameters.isEmpty())
        {
            StringBuffer sb = new StringBuffer();
            sb.append("?");
            for (Iterator iter = _parameters.entrySet().iterator(); iter.hasNext();)
            {
                Map.Entry entry = (Map.Entry) iter.next();
                sb.append(entry.getKey());
                sb.append("=");
                if (entry.getValue() != null)
                {
                    try
                    {
                        // encode the value to make it safe to be passed through the url
                        // the best we can do here is to use the same encoding than the response writer
                        String encoding = context.getResponseWriter().getCharacterEncoding();
                        if (encoding == null)
                        {
                            // or fallback to UTF-8 (which makes the most sense)
                            encoding = "UTF-8";
                        }
                        sb.append(URLEncoder.encode(entry.getValue().toString(), encoding));
                    }
                    catch (UnsupportedEncodingException e)
                    {
                        throw new FacesException(e);
                    }
                }
                if (iter.hasNext())
                {
                    sb.append("&");
                }
            }
            return sb.toString();
        }
        return null;
    }

    /**
     * @see java.lang.Object#equals(java.lang.Object)
     */
    public boolean equals(Object obj)
    {
        if (obj == null)
        {
            return false;
        }
        if (obj == this)
        {
            return true;
        }
        if (obj instanceof ParameterResourceHandler)
        {
            ParameterResourceHandler other = (ParameterResourceHandler) obj;
            return new EqualsBuilder().append(_parameters, other._parameters).isEquals();
        }
        return false;
    }

    /**
     * @see java.lang.Object#hashCode()
     */
    public int hashCode()
    {
        if (_hashCode == null)
        {
            _hashCode = new Integer(new HashCodeBuilder().append(_parameters).toHashCode());
        }
        return _hashCode.intValue();
    }
}