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The Apache Commons Codec package contains simple encoder and decoders for various formats such as Base64 and Hexadecimal. In addition to these widely used encoders and decoders, the codec package also maintains a collection of phonetic encoding utilities.
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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.poi.xdgf.usermodel;

import com.microsoft.schemas.office.visio.x2012.main.ConnectType;

/**
 * Represents connections in a Visio diagram.
 * 
 * Note that just because something appears to be visually connected in a
 * document does not mean that the user actually connected the elements. It
 * turns out there are a lot of ways that a careless user can neglect to
 * properly make connections that will not be recorded in the diagram
 * in a machine readable way.
 */
public class XDGFConnection {

    // comments on frompart/topart taken from pkgVisio

    // https://msdn.microsoft.com/en-us/library/ms367611(v=office.12).aspx

    // The following constants declared by the Microsoft Office Visio type
    // library show return values for the FromPart property.
    // Constant Value
    // visConnectFromError -1
    // visFromNone 0
    // visLeftEdge 1
    // visCenterEdge 2
    // visRightEdge 3
    // visBottomEdge 4
    // visMiddleEdge 5
    // visTopEdge 6
    // visBeginX 7
    // visBeginY 8
    // visBegin 9
    // visEndX 10
    // visEndY 11
    // visEnd 12
    // visFromAngle 13
    // visFromPin 14
    // visControlPoint 100 + zero-based row index (for example, visControlPoint
    // = 100 if the control point is in row 0; visControlPoint = 101 if the
    // control point is in row 1)

    public static final int visConnectFromError = -1;
    public static final int visFromNone = 0;
    public static final int visLeftEdge = 1;
    public static final int visCenterEdge = 2;
    public static final int visRightEdge = 3;
    public static final int visBottomEdge = 4;
    public static final int visMiddleEdge = 5;
    public static final int visTopEdge = 6;
    public static final int visBeginX = 7;
    public static final int visBeginY = 8;
    public static final int visBegin = 9;
    public static final int visEndX = 10;
    public static final int visEndY = 11;
    public static final int visEnd = 12;
    public static final int visFromAngle = 13;
    public static final int visFromPin = 14;

    // The ToPart property identifies the part of a shape to which another
    // shape is glued, such as its begin point or endpoint, one of its edges,
    // or a connection point. The following constants declared by the Visio type
    // library in member VisToParts show possible return values for the ToPart
    // property.
    // Constant Value
    // visConnectToError -1
    // visToNone 0
    // visGuideX 1
    // visGuideY 2
    // visWholeShape 3
    // visGuideIntersect 4
    // visToAngle 7
    // visConnectionPoint 100 + row index of connection point

    public static final int visConnectToError = -1;
    public static final int visToNone = 0;
    public static final int visGuideX = 1;
    public static final int visGuideY = 2;
    public static final int visWholeShape = 3;
    public static final int visGuideIntersect = 4;
    public static final int visToAngle = 7;

    private ConnectType _connect;
    private XDGFShape _from;
    private XDGFShape _to;

    public XDGFConnection(ConnectType connect, XDGFShape from, XDGFShape to) {
        _connect = connect;
        _from = from;
        _to = to;
    }

    public XDGFShape getFromShape() {
        return _from;
    }

    public XDGFCell getFromCell() {
        return _from.getCell(_connect.getFromCell());
    }

    public String getFromCellName() {
        return _connect.getFromCell();
    }

    public XDGFShape getToShape() {
        return _to;
    }

    public String getToCellName() {
        return _connect.getToCell();
    }

    // see constants above
    public Integer getFromPart() {
        if (_connect.isSetFromPart())
            return _connect.getFromPart();
        else
            return null;
    }

    /**
     * The ToPart property identifies the part of a shape to which another
     * shape is glued, such as its begin point or endpoint, one of its edges,
     * or a connection point.
     */
    public Integer getToPart() {
        if (_connect.isSetToPart())
            return _connect.getToPart();
        else
            return null;
    }
}