Android Open Source - Calculator-for-Android String Number Literal

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License

The source code is released under:

Apache License

Java Source Code

//   Copyright 2012 Digipom Inc.
////  w w  w  . j a  v a 2s.c o  m
//   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 com.digipom.android.library.evaluator.builder;

import com.digipom.android.library.evaluator.lexer.NumberLiteral;

class StringNumberLiteral extends NumberLiteral {
  private static final char NEGATIVE_CHAR = '-';
  private static final String DECIMAL_STR = ".";
  final StringBuilder value;

  StringNumberLiteral() {
    this.value = new StringBuilder();
  }

  StringNumberLiteral(String value) {
    this.value = new StringBuilder(value);
  }

  void addDecimalIfNeeded() {
    if (value.indexOf(DECIMAL_STR) == -1) {
      value.append(DECIMAL_STR);
    }
  }

  void togglePlusMinus() {
    if (value.length() > 0 && value.charAt(0) == NEGATIVE_CHAR) {
      value.deleteCharAt(0);
    } else {
      value.insert(0, NEGATIVE_CHAR);
    }
  }

  void appendDigit(int digit) {
    value.append(digit);
  }

  void deleteChar() {
    final int length = value.length();

    if (length > 0) {
      value.deleteCharAt(length - 1);
    }
  }

  boolean isEmpty() {
    return value.length() == 0;
  }

  @Override
  public String toString() {
    return value.toString();
  }
}

Java Source Code List

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