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- /*
- Copyright (c) 2016 James Ahlborn
-
- 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.healthmarketscience.jackcess.impl.expr;
-
- import java.math.BigDecimal;
- import java.text.DecimalFormatSymbols;
-
- import com.healthmarketscience.jackcess.expr.EvalException;
- import com.healthmarketscience.jackcess.expr.LocaleContext;
- import com.healthmarketscience.jackcess.expr.Value;
- import org.apache.commons.lang3.StringUtils;
-
- /**
- *
- * @author James Ahlborn
- */
- public class StringValue extends BaseValue
- {
- private static final Object NOT_A_NUMBER = new Object();
-
- private final String _val;
- private Object _num;
-
- public StringValue(String val)
- {
- _val = val;
- }
-
- @Override
- public Type getType() {
- return Type.STRING;
- }
-
- @Override
- public Object get() {
- return _val;
- }
-
- @Override
- public boolean getAsBoolean(LocaleContext ctx) {
- // ms access seems to treat strings as "true"
- return true;
- }
-
- @Override
- public String getAsString(LocaleContext ctx) {
- return _val;
- }
-
- @Override
- public Integer getAsLongInt(LocaleContext ctx) {
- return roundToLongInt(ctx);
- }
-
- @Override
- public Double getAsDouble(LocaleContext ctx) {
- return getNumber(ctx).doubleValue();
- }
-
- @Override
- public BigDecimal getAsBigDecimal(LocaleContext ctx) {
- return getNumber(ctx);
- }
-
- @Override
- public Value getAsDateTimeValue(LocaleContext ctx) {
- Value dateValue = DefaultDateFunctions.stringToDateValue(ctx, _val);
-
- if(dateValue == null) {
- // see if string can be coerced to number and then to value date (note,
- // numberToDateValue may return null for out of range numbers)
- try {
- dateValue = DefaultDateFunctions.numberToDateValue(
- getNumber(ctx).doubleValue());
- } catch(EvalException ignored) {
- // not a number, not a date/time
- }
-
- if(dateValue == null) {
- throw invalidConversion(Type.DATE_TIME);
- }
- }
-
- // TODO, for now, we can't cache the date value becuase it could be an
- // "implicit" date which would need to be re-calculated on each call
- return dateValue;
- }
-
- protected BigDecimal getNumber(LocaleContext ctx) {
- if(_num instanceof BigDecimal) {
- return (BigDecimal)_num;
- }
- if(_num == null) {
- // see if it is parseable as a number
- try {
- // ignore extraneous whitespace whitespace and handle "&[hH]" or
- // "&[oO]" prefix (only supports integers)
- String tmpVal = _val.trim();
- if(tmpVal.length() > 0) {
-
- if(tmpVal.charAt(0) != ValueSupport.NUMBER_BASE_PREFIX) {
- // convert to standard numeric support for parsing
- tmpVal = toCanonicalNumberFormat(ctx, tmpVal);
- _num = ValueSupport.normalize(new BigDecimal(tmpVal));
- return (BigDecimal)_num;
- }
-
- // parse as hex/octal symbolic value
- if(ValueSupport.HEX_PAT.matcher(tmpVal).matches()) {
- return parseIntegerString(tmpVal, 16);
- } else if(ValueSupport.OCTAL_PAT.matcher(tmpVal).matches()) {
- return parseIntegerString(tmpVal, 8);
- }
-
- // fall through to NaN
- }
- } catch(NumberFormatException nfe) {
- // fall through to NaN...
- }
- _num = NOT_A_NUMBER;
- }
- throw invalidConversion(Type.DOUBLE);
- }
-
- private BigDecimal parseIntegerString(String tmpVal, int radix) {
- _num = new BigDecimal(ValueSupport.parseIntegerString(tmpVal, radix));
- return (BigDecimal)_num;
- }
-
- private static String toCanonicalNumberFormat(LocaleContext ctx, String tmpVal)
- {
- // convert to standard numeric format:
- // - discard any grouping separators
- // - convert decimal separator to '.'
- DecimalFormatSymbols syms = ctx.getNumericConfig().getDecimalFormatSymbols();
- char groupSepChar = syms.getGroupingSeparator();
- tmpVal = StringUtils.remove(tmpVal, groupSepChar);
-
- char decSepChar = syms.getDecimalSeparator();
- if((decSepChar != ValueSupport.CANON_DEC_SEP) && (tmpVal.indexOf(decSepChar) >= 0)) {
- tmpVal = tmpVal.replace(decSepChar, ValueSupport.CANON_DEC_SEP);
- }
-
- return tmpVal;
- }
- }
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