/*
 * 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.Attributes;
import org.xml.sax.Locator;

import org.apache.fop.apps.FOPException;
import org.apache.fop.fo.Constants;
import org.apache.fop.fo.FONode;
import org.apache.fop.fo.PropertyList;
import org.apache.fop.fo.extensions.ExtensionAttachment;

/**
 * This class extends the org.apache.fop.extensions.ExtensionObj class. The
 * object facilitates extraction of elements from formatted objects based on
 * the static list as defined in the AFPElementMapping implementation.
 */
public class AFPPageSetupElement extends AbstractAFPExtensionObject {

    private static final String ATT_ENCODING = "encoding";
    private static final String ATT_SRC = "src";

    /**
     * Constructs an AFP object (called by Maker).
     *
     * @param parent the parent formatting object
     * @param name the name of the afp element
     */
    public AFPPageSetupElement(FONode parent, String name) {
        super(parent, name);
    }

    private AFPPageSetup getPageSetupAttachment() {
        return (AFPPageSetup)getExtensionAttachment();
    }

    /** {@inheritDoc} */
    @Override
    public void startOfNode() throws FOPException {
        super.startOfNode();
        if (AFPElementMapping.TAG_LOGICAL_ELEMENT.equals(getLocalName())) {
            if (parent.getNameId() != Constants.FO_SIMPLE_PAGE_MASTER
                    && parent.getNameId() != Constants.FO_PAGE_SEQUENCE) {
                invalidChildError(getLocator(), parent.getName(), getNamespaceURI(), getName(),
                    "rule.childOfPageSequenceOrSPM");
            }
        } else {
            if (parent.getNameId() != Constants.FO_SIMPLE_PAGE_MASTER
                    && parent.getNameId() != Constants.FO_PAGE_SEQUENCE
                    && parent.getNameId() != Constants.FO_DECLARATIONS) {
                invalidChildError(getLocator(), parent.getName(), getNamespaceURI(), getName(),
                    "rule.childOfSPMorPSorDeclarations");
            }
        }
    }

    /** {@inheritDoc} */
    @Override
    protected void characters(char[] data, int start, int length,
                                 PropertyList pList, Locator locator) throws FOPException {
        StringBuffer sb = new StringBuffer();
        AFPPageSetup pageSetup = getPageSetupAttachment();
        if (pageSetup.getContent() != null) {
            sb.append(pageSetup.getContent());
        }
        sb.append(data, start, length);
        pageSetup.setContent(sb.toString());
    }

    /** {@inheritDoc} */
    @Override
    public void processNode(String elementName, Locator locator,
                            Attributes attlist, PropertyList propertyList)
                                throws FOPException {
        super.processNode(elementName, locator, attlist, propertyList);
        AFPPageSetup pageSetup = getPageSetupAttachment();
        if (AFPElementMapping.INCLUDE_PAGE_SEGMENT.equals(elementName)) {
            String attr = attlist.getValue(ATT_SRC);
            if (attr != null && attr.length() > 0) {
                pageSetup.setValue(attr);
            } else {
                missingPropertyError(ATT_SRC);
            }
        } else if (AFPElementMapping.TAG_LOGICAL_ELEMENT.equals(elementName)) {
            String attr = attlist.getValue(AFPPageSetup.ATT_VALUE);
            if (attr != null && attr.length() > 0) {
                pageSetup.setValue(attr);
            } else {
                missingPropertyError(AFPPageSetup.ATT_VALUE);
            }
            attr = attlist.getValue(ATT_ENCODING);
            if (attr != null) {
                try {
                    pageSetup.setEncoding(Integer.parseInt(attr));
                } catch (NumberFormatException nfe) {
                    invalidPropertyValueError(ATT_ENCODING, attr, nfe);
                }

            }

        }
        String placement = attlist.getValue(AFPPageSetup.ATT_PLACEMENT);
        if (placement != null && placement.length() > 0) {
            pageSetup.setPlacement(ExtensionPlacement.fromXMLValue(placement));
        }
    }

    /** {@inheritDoc} */
    @Override
    protected ExtensionAttachment instantiateExtensionAttachment() {
        return new AFPPageSetup(getLocalName());
    }
}