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Common code for integration of Tiles for different templating technologies.
There is a newer version: 3.0.8
/*
 * $Id: GetAsStringModel.java 1305937 2012-03-27 18:15:15Z nlebas $
 *
 * 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.tiles.template;

import java.io.IOException;
import java.io.Writer;
import java.util.Deque;

import org.apache.tiles.Attribute;
import org.apache.tiles.TilesContainer;
import org.apache.tiles.access.TilesAccess;
import org.apache.tiles.autotag.core.runtime.ModelBody;
import org.apache.tiles.autotag.core.runtime.annotation.Parameter;
import org.apache.tiles.request.Request;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 
 *  Render the value of the specified template attribute to the current
 * Writer
 * 
 *
 * 
 * Retrieve the value of the specified template attribute property, and render
 * it to the current Writer as a String. The usual toString() conversions is
 * applied on found value.
 * 
 *
 * @version $Rev: 1305937 $ $Date: 2012-03-27 20:15:15 +0200 (Tue, 27 Mar 2012) $
 * @since 2.2.0
 */
public class GetAsStringModel {

    /**
     * The logging object.
     */
    private Logger log = LoggerFactory.getLogger(getClass());

    /**
     * The attribute resolver to use.
     */
    private AttributeResolver attributeResolver;

    /**
     * Constructor that uses the defaut attribute resolver.
     *
     * @since 3.0.0
     */
    public GetAsStringModel() {
        this(new DefaultAttributeResolver());
    }

    /**
     * Constructor.
     *
     * @param attributeResolver The attribute resolver to use.
     * @since 2.2.0
     */
    public GetAsStringModel(AttributeResolver attributeResolver) {
        this.attributeResolver = attributeResolver;
    }

    /**
     * Executes the operation.
     * @param ignore If true, if an exception happens during
     * rendering, of if the attribute is null, the problem will be ignored.
     * @param preparer The preparer to invoke before rendering the attribute.
     * @param role A comma-separated list of roles. If present, the attribute
     * will be rendered only if the current user belongs to one of the roles.
     * @param defaultValue The default value of the attribute. To use only if
     * the attribute was not computed.
     * @param defaultValueRole The default comma-separated list of roles. To use
     * only if the attribute was not computed.
     * @param defaultValueType The default type of the attribute. To use only if
     * the attribute was not computed.
     * @param name The name of the attribute.
     * @param value The attribute to use immediately, if not null.
     * @param request The request.
     * @param modelBody The body.
     * @throws IOException If an I/O error happens during rendering.
     * @since 2.2.0
     */
    public void execute(boolean ignore, String preparer, String role,
            Object defaultValue, String defaultValueRole,
            String defaultValueType, @Parameter(required = true) String name,
            Attribute value, Request request, ModelBody modelBody)
            throws IOException {
        TilesContainer container = TilesAccess.getCurrentContainer(request);
        Deque