/*
 * 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.
 */

/* $Id$ */

package org.apache.fop.render.afp.extensions;

import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.AttributesImpl;

/**
 * This is the pass-through value object for the AFP extension.
 */
public class AFPPageSetup extends AFPExtensionAttachment {

    /** value attribute */
    protected static final String ATT_VALUE = "value";

    /** placement attribute */
    protected static final String ATT_PLACEMENT = "placement";

    /**
     * the extension content
     */
    protected String content;

    /**
     * the extension value attribute
     */
    protected String value;

    /** defines where to place the extension in the generated file */
    protected ExtensionPlacement placement = ExtensionPlacement.DEFAULT;

    /**
     * Default constructor.
     *
     * @param elementName the name of the setup code object, may be null
     */
    public AFPPageSetup(String elementName) {
        super(elementName);
    }

    private static final long serialVersionUID = -549941295384013190L;

    /**
     * Returns the value of the extension.
     * @return the value
     */
    public String getValue() {
        return value;
    }

    /**
     * Sets the value
     * @param source The value name to set.
     */
    public void setValue(String source) {
        this.value = source;
    }

    /**
     * Returns the content of the extension.
     * @return the data
     */
    public String getContent() {
        return content;
    }

    /**
     * Sets the data
     * @param content The byte data to set.
     */
    public void setContent(String content) {
        this.content = content;
    }

    /**
     * Returns the intended placement of the extension inside the generated file.
     * @return the intended placement
     */
    public ExtensionPlacement getPlacement() {
        return this.placement;
    }

    /**
     * Sets the intended placement of the extension inside the generated file.
     * @param placement the intended placement
     */
    public void setPlacement(ExtensionPlacement placement) {
        if (!AFPElementMapping.NO_OPERATION.equals(getElementName())) {
            throw new UnsupportedOperationException(
                    "The attribute 'placement' can currently only be set for NOPs!");
        }
        this.placement = placement;
    }

    /** {@inheritDoc} */
    public void toSAX(ContentHandler handler) throws SAXException {
        AttributesImpl atts = new AttributesImpl();
        if (name != null && name.length() > 0) {
            atts.addAttribute(null, ATT_NAME, ATT_NAME, "CDATA", name);
        }
        if (value != null && value.length() > 0) {
            atts.addAttribute(null, ATT_VALUE, ATT_VALUE, "CDATA", value);
        }
        if (this.placement != ExtensionPlacement.DEFAULT) {
            atts.addAttribute(null, ATT_PLACEMENT, ATT_PLACEMENT, "CDATA", placement.getXMLValue());
        }
        handler.startElement(CATEGORY, elementName, elementName, atts);
        if (content != null && content.length() > 0) {
            char[] chars = content.toCharArray();
            handler.characters(chars, 0, chars.length);
        }
        handler.endElement(CATEGORY, elementName, elementName);
    }

    /** {@inheritDoc} */
    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder("AFPPageSetup(");
        sb.append("element-name=").append(getElementName());
        sb.append(" name=").append(getName());
        sb.append(" value=").append(getValue());
        if (getPlacement() != ExtensionPlacement.DEFAULT) {
            sb.append(" placement=").append(getPlacement());
        }
        sb.append(")");
        return sb.toString();
    }
}