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• PDNameTreeNode.java

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org.apache.pdfbox.pdmodel.common.PDNameTreeNode Maven / Gradle / Ivy

/*
 * 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.pdfbox.pdmodel.common;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.pdfbox.cos.COSArray;
import org.apache.pdfbox.cos.COSBase;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.cos.COSString;

/**
 * This class represents a PDF Name tree.  See the PDF Reference 1.5 section 3.8.5
 * for more details.
 *
 * @author Ben Litchfield
 * @version $Revision: 1.4 $
 */
public class PDNameTreeNode implements COSObjectable
{
    private static final Log LOG = LogFactory.getLog(PDNameTreeNode.class);
    private COSDictionary node;
    private Class valueType = null;
    private PDNameTreeNode parent = null;

    /**
     * Constructor.
     *
     * @param valueClass The PD Model type of object that is the value.
     */
    public PDNameTreeNode( Class valueClass )
    {
        node = new COSDictionary();
        valueType = valueClass;
    }

    /**
     * Constructor.
     *
     * @param dict The dictionary that holds the name information.
     * @param valueClass The PD Model type of object that is the value.
     */
    public PDNameTreeNode( COSDictionary dict, Class valueClass )
    {
        node = dict;
        valueType = valueClass;
    }

    /**
     * Convert this standard java object to a COS object.
     *
     * @return The cos object that matches this Java object.
     */
    public COSBase getCOSObject()
    {
        return node;
    }

    /**
     * Convert this standard java object to a COS object.
     *
     * @return The cos object that matches this Java object.
     */
    public COSDictionary getCOSDictionary()
    {
        return node;
    }

    /**
     * Returns the parent node.
     * 
     * @return parent node
     */
    public PDNameTreeNode getParent()
    {
        return parent;
    }

    /**
     * Sets the parent to the given node.
     * 
     * @param parentNode the node to be set as parent
     */
    public void setParent(PDNameTreeNode parentNode)
    {
        parent = parentNode;
        calculateLimits();
    }
    
    /**
     * Determines if this is a root node or not.
     * 
     * @return true if this is a root node
     */
    public boolean isRootNode()
    {
        return parent == null;
    }
    /**
     * Return the children of this node.  This list will contain PDNameTreeNode objects.
     *
     * @return The list of children or null if there are no children.
     */
    public List getKids()
    {

        List retval = null;
        COSArray kids = (COSArray)node.getDictionaryObject( COSName.KIDS );
        if( kids != null )
        {
            List pdObjects = new ArrayList();
            for( int i=0; i(pdObjects,kids);
        }

        return retval;
    }

    /**
     * Set the children of this named tree.
     *
     * @param kids The children of this named tree.
     */
    public void setKids( List kids )
    {
        if (kids != null && kids.size() > 0)
        {
            for (PDNameTreeNode kidsNode : kids)
                kidsNode.setParent(this);
            node.setItem( COSName.KIDS, COSArrayList.converterToCOSArray( kids ) );
            // root nodes with kids don't have Names
            if (isRootNode())
            {
                node.setItem(COSName.NAMES, null);
            }
        }
        else 
        {
            // remove kids
            node.setItem(COSName.KIDS, null);
            // remove Limits 
            node.setItem(COSName.LIMITS, null);
        }
        calculateLimits();
    }

    private void calculateLimits()
    {
        if (isRootNode())
        {
            node.setItem(COSName.LIMITS, null);
        }
        else
        {
            List kids = getKids();
            if (kids != null && kids.size() > 0)
            {
                PDNameTreeNode firstKid = kids.get(0);
                PDNameTreeNode lastKid = kids.get(kids.size() - 1);
                String lowerLimit = firstKid.getLowerLimit();
                setLowerLimit(lowerLimit);
                String upperLimit = lastKid.getUpperLimit();
                setUpperLimit(upperLimit);
            }
            else
            {
                try 
                {
                    Map names = getNames();
                    if (names != null && names.size() > 0)
                    {
                        Object[] keys = names.keySet().toArray();
                        String lowerLimit = (String)keys[0];
                        setLowerLimit(lowerLimit);
                        String upperLimit = (String)keys[keys.length-1];
                        setUpperLimit(upperLimit);
                    }
                    else
                    {
                        node.setItem(COSName.LIMITS, null);
                    }
                }
                catch (IOException exception)
                {
                    node.setItem(COSName.LIMITS, null);
                    LOG.error("Error while calculating the Limits of a PageNameTreeNode:", exception);
                }
            }
        }
    }
    /**
     * The name to retrieve.
     *
     * @param name The name in the tree.
     *
     * @return The value of the name in the tree.
     *
     * @throws IOException If an there is a problem creating the destinations.
     */
    public Object getValue( String name ) throws IOException
    {
        Object retval = null;
        Map names = getNames();
        if( names != null )
        {
            retval = names.get( name );
        }
        else
        {
            List kids = getKids();
            if (kids != null)
            {
                for( int i=0; i= 0))
                    {
                        retval = childNode.getValue( name );
                    }
                }
            }
            else
            {
                LOG.warn("NameTreeNode does not have \"names\" nor \"kids\" objects.");
            }
        }
        return retval;
    }


    /**
     * This will return a map of names. The key will be a string, and the
     * value will depend on where this class is being used.
     *
     * @return ordered map of cos objects or null if dictionary
     *         contains no 'Names' entry
     * @throws IOException If there is an error while creating the sub types.
     */
    public Map getNames() throws IOException
    {
        COSArray namesArray = (COSArray)node.getDictionaryObject( COSName.NAMES );
        if( namesArray != null )
        {
            Map names = new LinkedHashMap();
            for( int i=0; inull
     */
    public void setNames( Map names )
    {
        if( names == null )
        {
            node.setItem( COSName.NAMES, (COSObjectable)null );
            node.setItem( COSName.LIMITS, (COSObjectable)null);
        }
        else
        {
            COSArray array = new COSArray();
            List keys = new ArrayList(names.keySet());
            Collections.sort(keys);
            for (String key : keys) 
            {
                array.add(new COSString(key));
                array.add(names.get(key));
            }
            node.setItem(COSName.NAMES, array);
            calculateLimits();
        }
    }

    /**
     * Get the highest value for a key in the name map.
     *
     * @return The highest value for a key in the map.
     */
    public String getUpperLimit()
    {
        String retval = null;
        COSArray arr = (COSArray)node.getDictionaryObject( COSName.LIMITS );
        if( arr != null )
        {
            retval = arr.getString( 1 );
        }
        return retval;
    }

    /**
     * Set the highest value for the key in the map.
     *
     * @param upper The new highest value for a key in the map.
     */
    private void setUpperLimit( String upper )
    {
        COSArray arr = (COSArray)node.getDictionaryObject( COSName.LIMITS );
        if( arr == null )
        {
            arr = new COSArray();
            arr.add( null );
            arr.add( null );
            node.setItem(COSName.LIMITS, arr);
        }
        arr.setString( 1, upper );
    }

    /**
     * Get the lowest value for a key in the name map.
     *
     * @return The lowest value for a key in the map.
     */
    public String getLowerLimit()
    {
        String retval = null;
        COSArray arr = (COSArray)node.getDictionaryObject( COSName.LIMITS );
        if( arr != null )
        {
            retval = arr.getString( 0 );
        }
        return retval;
    }

    /**
     * Set the lowest value for the key in the map.
     *
     * @param lower The new lowest value for a key in the map.
     */
    private void setLowerLimit( String lower )
    {
        COSArray arr = (COSArray)node.getDictionaryObject( COSName.LIMITS );
        if( arr == null )
        {
            arr = new COSArray();
            arr.add( null );
            arr.add( null );
            node.setItem(COSName.LIMITS, arr);
        }
        arr.setString( 0, lower );
    }
}