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Java example source code file (MoneyParseContext.java)

This example Java source code file (MoneyParseContext.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

bigdecimal, bigmoney, cannot, charsequence, currencyunit, locale, math, moneyformatexception, moneyparsecontext, parseposition, string, text, util

The MoneyParseContext.java Java example source code

/*
 *  Copyright 2009-present, Stephen Colebourne
 *
 *  Licensed 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.joda.money.format;

import java.math.BigDecimal;
import java.text.ParsePosition;
import java.util.Locale;

import org.joda.money.BigMoney;
import org.joda.money.CurrencyUnit;

/**
 * Context used when parsing money.
 * <p>
 * This class is mutable and intended for use by a single thread.
 * A new instance is created for each parse.
 */
public final class MoneyParseContext {

    /**
     * The locale to parse using.
     */
    private Locale locale;
    /**
     * The text to parse.
     */
    private CharSequence text;
    /**
     * The text index.
     */
    private int textIndex;
    /**
     * The text error index.
     */
    private int textErrorIndex = -1;
    /**
     * The parsed currency.
     */
    private CurrencyUnit currency;
    /**
     * The parsed amount.
     */
    private BigDecimal amount;

    /**
     * Constructor.
     * 
     * @param locale  the locale, not null
     * @param text  the text to parse, not null
     * @param index  the current text index
     */
    MoneyParseContext(Locale locale, CharSequence text, int index) {
        this.locale = locale;
        this.text = text;
        this.textIndex = index;
    }

    /**
     * Constructor.
     * 
     * @param locale  the locale, not null
     * @param text  the text to parse, not null
     * @param index  the current text index
     * @param errorIndex  the error index
     * @param currency  the currency
     * @param amount  the parsed amount
     */
    MoneyParseContext(Locale locale, CharSequence text, int index, int errorIndex, CurrencyUnit currency, BigDecimal amount) {
        this.locale = locale;
        this.text = text;
        this.textIndex = index;
        this.textErrorIndex = errorIndex;
        this.currency = currency;
        this.amount = amount;
    }

    //-----------------------------------------------------------------------
    /**
     * Gets the locale.
     * 
     * @return the locale, not null
     */
    public Locale getLocale() {
        return locale;
    }

    /**
     * Sets the locale.
     * 
     * @param locale  the locale, not null
     */
    public void setLocale(Locale locale) {
        MoneyFormatter.checkNotNull(locale, "Locale must not be null");
        this.locale = locale;
    }

    /**
     * Gets the text being parsed.
     * 
     * @return the text being parsed, never null
     */
    public CharSequence getText() {
        return text;
    }

    /**
     * Sets the text.
     * 
     * @param text  the text being parsed, not null
     */
    public void setText(CharSequence text) {
        MoneyFormatter.checkNotNull(text, "Text must not be null");
        this.text = text;
    }

    /**
     * Gets the length of the text being parsed.
     * 
     * @return the length of the text being parsed
     */
    public int getTextLength() {
        return text.length();
    }

    /**
     * Gets a substring of the text being parsed.
     * 
     * @param start  the start index
     * @param end  the end index
     * @return the substring, not null
     */
    public String getTextSubstring(int start, int end) {
        return text.subSequence(start, end).toString();
    }

    //-----------------------------------------------------------------------
    /**
     * Gets the current parse position index.
     * 
     * @return the current parse position index
     */
    public int getIndex() {
        return textIndex;
    }

    /**
     * Sets the current parse position index.
     * 
     * @param index  the current parse position index
     */
    public void setIndex(int index) {
        this.textIndex = index;
    }

    //-----------------------------------------------------------------------
    /**
     * Gets the error index.
     * 
     * @return the error index, negative if no error
     */
    public int getErrorIndex() {
        return textErrorIndex;
    }

    /**
     * Sets the error index.
     * 
     * @param index  the error index
     */
    public void setErrorIndex(int index) {
        this.textErrorIndex = index;
    }

    /**
     * Sets the error index from the current index.
     */
    public void setError() {
        this.textErrorIndex = textIndex;
    }

    //-----------------------------------------------------------------------
    /**
     * Gets the parsed currency.
     * 
     * @return the parsed currency, null if not parsed yet
     */
    public CurrencyUnit getCurrency() {
        return currency;
    }

    /**
     * Sets the parsed currency.
     * 
     * @param currency  the parsed currency, may be null
     */
    public void setCurrency(CurrencyUnit currency) {
        this.currency = currency;
    }

    //-----------------------------------------------------------------------
    /**
     * Gets the parsed amount.
     * 
     * @return the parsed amount, null if not parsed yet
     */
    public BigDecimal getAmount() {
        return amount;
    }

    /**
     * Sets the parsed currency.
     * 
     * @param amount  the parsed amount, may be null
     */
    public void setAmount(BigDecimal amount) {
        this.amount = amount;
    }

    //-----------------------------------------------------------------------
    /**
     * Checks if the parse has found an error.
     * 
     * @return whether a parse error has occurred
     */
    public boolean isError() {
        return textErrorIndex >= 0;
    }

    /**
     * Checks if the text has been fully parsed such that there is no more text to parse.
     * 
     * @return true if fully parsed
     */
    public boolean isFullyParsed() {
        return textIndex == getTextLength();
    }

    /**
     * Checks if the context contains a currency and amount suitable for creating
     * a monetary value.
     * 
     * @return true if able to create a monetary value
     */
    public boolean isComplete() {
        return currency != null && amount != null;
    }

    //-----------------------------------------------------------------------
    /**
     * Creates a child context.
     * 
     * @return the child context, never null
     */
    MoneyParseContext createChild() {
        return new MoneyParseContext(locale, text, textIndex, textErrorIndex, currency, amount);
    }

    /**
     * Merges the child context back into this instance.
     * 
     * @param child  the child context, not null
     */
    void mergeChild(MoneyParseContext child) {
        setLocale(child.getLocale());
        setText(child.getText());
        setIndex(child.getIndex());
        setErrorIndex(child.getErrorIndex());
        setCurrency(child.getCurrency());
        setAmount(child.getAmount());
    }

    //-----------------------------------------------------------------------
    /**
     * Converts the indexes to a parse position.
     * 
     * @return the parse position, never null
     */
    public ParsePosition toParsePosition() {
        ParsePosition pp = new ParsePosition(textIndex);
        pp.setErrorIndex(textErrorIndex);
        return pp;
    }

    /**
     * Converts the context to a {@code BigMoney}.
     * 
     * @return the monetary value, never null
     * @throws MoneyFormatException if either the currency or amount is missing
     */
    public BigMoney toBigMoney() {
        if (currency == null) {
            throw new MoneyFormatException("Cannot convert to BigMoney as no currency found");
        }
        if (amount == null) {
            throw new MoneyFormatException("Cannot convert to BigMoney as no amount found");
        }
        return BigMoney.of(currency, amount);
    }

}

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