tablelayoutconstraints.java

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package net.sf.hibern8ide.swing;

import java.util.NoSuchElementException;
import java.util.StringTokenizer;

/**
 * The following inner class is used to bind components to their
 * constraints.
 *
 * @author  Daniel E. Barbalace
 */

public class TableLayoutConstraints implements TableLayoutConstants {

    /** Cell in which the upper left corner of the component lays */
    public int col1, row1;

    /** Cell in which the lower right corner of the component lays */
    public int col2, row2;

    /** Horizontal justification if component occupies just one cell */
    public int hAlign;

    /** Verical justification if component occupies just one cell */
    public int vAlign;


    /**
     * Constructs an TableLayoutConstraints with the default settings.  This
     * constructor is equivalent to TableLayoutConstraints(0, 0, 0, 0, FULL, FULL).
     */

    public TableLayoutConstraints () {
        col1 = row1 = col2 = col2 = 0;
        hAlign = vAlign = FULL;
    }

    /**
     * Constructs an TableLayoutConstraints from a string.
     *
     * @param constraints    indicates TableLayoutConstraints's position and justification
     *                       as a string in the form "row, column" or
     *                       "row, column, horizontal justification, vertical
     *                       justification" or "row 1, column 1, row 2, column 2".
     *                       It is also acceptable to delimit the paramters with
     *                       spaces instead of commas.
     */
    public TableLayoutConstraints (String constraints) {
        // Parse constraints using spaces or commas
        StringTokenizer st = new StringTokenizer(constraints, ", ");

        // Use default values for any parameter not specified or specified
        // incorrectly.  The default parameters place the component in a single
        // cell at column 0, row 0.  The component is fully justified.
        col1 = 0;
        row1 = 0;
        col2 = 0;
        row2 = 0;
        hAlign = FULL;
        vAlign = FULL;

        String token = null;

        try {
            // Get the first column (assume component is in only one column)
            token = st.nextToken();
            col1 = new Integer(token).intValue();
            col2 = col1;

            // Get the first row (assume component is in only one row)
            token = st.nextToken();
            row1 = new Integer(token).intValue();
            row2 = row1;

            // Get the second column
            token = st.nextToken();
            col2 = new Integer(token).intValue();

            // Get the second row
            token = st.nextToken();
            row2 = new Integer(token).intValue();
        } catch (NoSuchElementException error) {
        } catch (NumberFormatException error) {
            try {
                // Check if token means horizontally justification the component
                if (token.equalsIgnoreCase("L"))
                    hAlign = LEFT;
                else if (token.equalsIgnoreCase("C"))
                    hAlign = CENTER;
                else if (token.equalsIgnoreCase("F"))
                    hAlign = FULL;
                else if (token.equalsIgnoreCase("R"))
                    hAlign = RIGHT;

                // There can be one more token for the vertical justification even
                // if the horizontal justification is invalid
                token = st.nextToken();

                // Check if token means horizontally justification the component
                if (token.equalsIgnoreCase("T"))
                    vAlign = TOP;
                else if (token.equalsIgnoreCase("C"))
                    vAlign = CENTER;
                else if (token.equalsIgnoreCase("F"))
                    vAlign = FULL;
                else if (token.equalsIgnoreCase("B"))
                    vAlign = BOTTOM;
            } catch (NoSuchElementException error2) {}
        }

        // Make sure row2 >= row1
        if (row2 < row1)
            row2 = row1;

        // Make sure col2 >= col1
        if (col2 < col1)
            col2 = col1;
    }



    /**
     * Constructs an TableLayoutConstraints a set of constraints.
     *
     * @param col1      column where upper-left cornor of the component is placed
     * @param row1      row where upper-left cornor of the component is placed
     * @param col2      column where lower-right cornor of the component is placed
     * @param row2      row where lower-right cornor of the component is placed
     * @param hAlign    horizontal justification of a component in a single cell
     * @param vAlign    vertical justification of a component in a single cell
     */

    public TableLayoutConstraints
        (int col1, int row1, int col2, int row2, int hAlign, int vAlign) {
        this.col1 = col1;
        this.row1 = row1;
        this.col2 = col2;
        this.row2 = row2;

        if ((hAlign < MIN_ALIGN) || (hAlign > MAX_ALIGN))
            this.hAlign = FULL;
        else
            this.hAlign = hAlign;

        if ((vAlign < MIN_ALIGN) || (vAlign > MAX_ALIGN))
            this.vAlign = FULL;
        else
            this.vAlign = vAlign;
    }



    /**
     * Gets a string representation of this TableLayoutConstraints.
     *
     * @return a string in the form "row 1, column 1, row 2, column 2" or
     *         "row, column, horizontal justification, vertical justification"
     */

    public String toString () {
        StringBuffer buffer = new StringBuffer();

        buffer.append (row1);
        buffer.append (", ");
        buffer.append (col1);
        buffer.append (", ");

        if ((row1 == row2) && (col1 == col2)) {
            final char h[] = {'L', 'C', 'F', 'R'};
            final char v[] = {'T', 'C', 'F', 'B'};

            buffer.append (h[hAlign]);
            buffer.append (", ");
            buffer.append (v[vAlign]);
        } else {
            buffer.append (row2);
            buffer.append (", ");
            buffer.append (col2);
        }
        return buffer.toString();
    }
}