postalcodefield.java

开发j2me 手机程序必须的用到的。文件较小

package com.jmobilecore.ui;

import com.jmobilecore.ui.core.TextField;
import com.jmobilecore.ui.core.TextComponent;

/**
 * This class displays formatted textfield for entering postal code information
 * Format of the postal code is specified by user.
 *
 * @author Igor Shevlyakov - initial implementation
 * @author Greg Gridin - redesign
 */
public class PostalCodeField extends TextField {

    /**
     * The 5 digits postal code, example 12345
     */
    public static final byte XXXXX = 1;

    /**
     * The 5 digits postal code with extension, example 12345-6789
     */
    public static final byte XXXXX_XXXX = 2;

    /**
     * The 6 digits postal code, example 123456
     */
    public static final byte XXXXXX = 3;

    /**
     * The current PostalCodeField formatting style.
     */
    final public byte STYLE;

    /**
     * Constructs a new <code>PostalCodeField</code> object.
     */
    public PostalCodeField() {
        this(XXXXX);
    }

    /**
     * Constructs a new <code>PostalCodeField</code> object of specified style.
     *
     * @param style the postal code style
     */
    public PostalCodeField(byte style) {
        super(-1, TextComponent.C_NUMERIC);
        STYLE = style;
        composer = initComposer(style);
        composer.setCaretPosition(0);
    };

    /**
     * Constructs a new <code>PostalCodeField</code> object
     * of the specified style and the specified value.
     *
     * @param style      the postal code style
     * @param postalCode the postal code, digits only no spaces or dashes
     */
    public PostalCodeField(byte style, String postalCode) {
        this(style);
        setText(postalCode);
    }

    /**
     * Initialize postal code field composer
     *
     * @return <code>CustomFieldComposer</code> for postal code field
     */
    protected CustomFieldComposer initComposer(int style) {

        TextBlockComposer[] textBlocks = null;
        if (STYLE == XXXXX) {
            textBlocks = new TextBlockComposer[1];
            textBlocks[0] = new DigitalBlockComposer(DigitalBlockComposer.FIXED_SIZE, 5);
        }
        if (STYLE == XXXXXX) {
            textBlocks = new TextBlockComposer[1];
            textBlocks[0] = new DigitalBlockComposer(DigitalBlockComposer.FIXED_SIZE, 6);
        }
        if (STYLE == XXXXX_XXXX) {
            textBlocks = new TextBlockComposer[2];
            textBlocks[0] = new DigitalBlockComposer(DigitalBlockComposer.FIXED_SIZE, 5);
            textBlocks[1] = new DigitalBlockComposer(DigitalBlockComposer.FIXED_SIZE, 4);
        }
        return new CustomFieldComposer(textBlocks) {
            public void setText(String text) {

                if (text == null) return;
                if (STYLE == XXXXX) {
                    textBlocks[0].setText(text.substring(0, 5));
                }
                if (STYLE == XXXXXX) {
                    textBlocks[0].setText(text.substring(0, 6));
                }
                if (STYLE == XXXXX_XXXX) {
                    textBlocks[0].setText(text.substring(0, 5));
                    textBlocks[1].setText(text.substring(5, 9));
                }
                setCaretPosition(0);
            }
        };
    }

    /**
     * Get formatted according to <code>STYLE</code> phone number
     * or <code>null</code> if <code>PhoneNumberField</code> object value is set to null or incomplete
     *
     * @return the <code>String</code> representing phone number
     */
    public String getFormattedText() {

        return composer.getText();
    }

    protected char[] getFormattedText(boolean calcCursorOffset) {

        char unformatted[] = composer.getText().toCharArray();;
        int fmtCaretPos=0;
        char formattedText[];
        if (STYLE == XXXXX || STYLE == XXXXXX) {
            formattedText = unformatted;
            fmtCaretPos = composer.getCaretPosition();
            currentLength = formattedText.length;
        } else {
            currentLength = unformatted.length+1;
            formattedText = new char[currentLength];
            TextBlockComposer blocks[] = ((CustomFieldComposer) composer).textBlocks;
            System.arraycopy(blocks[0].getChars(), 0, formattedText, 0, 5);
            formattedText[5]='-';
            System.arraycopy(blocks[1].getChars(), 0, formattedText, 6, 4);
        }
        if (calcCursorOffset) {
            calculatedCaretPosition = fmtCaretPos;
            calculatedCursorOffset = getCursorOffset(formattedText, calculatedCaretPosition);
        }
        return formattedText;
    }

    /**
     * Sets the <code>PostalCodeField</code> object to specified value
     *
     * @param postalCode the postal code, digits only no spaces or dashes
     */
    public void setText(String postalCode) {
        if (validate(postalCode)) {
            composer.setText(postalCode);
        }
    }

    /**
     * Tests postal code field value for correctness
     *
     * @return <code>true</code> if the postal code field is valid
     *         <code>false</code> otherwise
     */
    public boolean isValid() {
        return ((CustomFieldComposer) composer).isComplete();
    }

    /**
     * Tests if the specified postal code valid
     *
     * @param postalCode postal code number without formatting (spaces, dashes etc.)
     * @return <code>true</code> if the postal code field is valid
     *         <code>false</code> otherwise
     */
    public boolean validate(String postalCode) {

        if (postalCode != null) {
            final int FIELD_LEN = ((CustomFieldComposer) composer).getMaxSize();
            if (postalCode.length() == FIELD_LEN) {
                char curChar;
                for (int i = 0; i < FIELD_LEN; i++) {
                    curChar = postalCode.charAt(i);
                    if (!(Character.isDigit(curChar))) return false;
                }
                return true;
            }
        }
        return false;
    }
}