/*******************************************************************************
* Copyright 2013 SAP AG
*
* 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.sap.core.odata.core.edm;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import com.sap.core.odata.api.edm.EdmFacets;
import com.sap.core.odata.api.edm.EdmLiteralKind;
import com.sap.core.odata.api.edm.EdmSimpleType;
import com.sap.core.odata.api.edm.EdmSimpleTypeException;
/**
* Implementation of the EDM simple type Decimal.
* @author SAP AG
*/
public class EdmDecimal extends AbstractSimpleType {
// value-range limitation according to the CSDL document
private static final int MAX_DIGITS = 29;
private static final Pattern PATTERN = Pattern.compile("(?:\\+|-)?(?:0*(\\p{Digit}{1,29}?))(?:\\.(\\p{Digit}{1,29}?)0*)?(M|m)?");
private static final EdmDecimal instance = new EdmDecimal();
public static EdmDecimal getInstance() {
return instance;
}
@Override
public boolean isCompatible(final EdmSimpleType simpleType) {
return simpleType instanceof Bit
|| simpleType instanceof Uint7
|| simpleType instanceof EdmByte
|| simpleType instanceof EdmSByte
|| simpleType instanceof EdmInt16
|| simpleType instanceof EdmInt32
|| simpleType instanceof EdmInt64
|| simpleType instanceof EdmSingle
|| simpleType instanceof EdmDouble
|| simpleType instanceof EdmDecimal;
}
@Override
public Class<?> getDefaultType() {
return BigDecimal.class;
}
@Override
public boolean validate(final String value, final EdmLiteralKind literalKind, final EdmFacets facets) {
if (value == null) {
return facets == null || facets.isNullable() == null || facets.isNullable();
}
if (literalKind == null) {
return false;
}
return validateLiteral(value, literalKind) && validatePrecisionAndScale(value, facets);
}
private static boolean validateLiteral(final String value, final EdmLiteralKind literalKind) {
final Matcher matcher = PATTERN.matcher(value);
return matcher.matches()
&& (literalKind == EdmLiteralKind.URI) != (matcher.group(3) == null);
}
private static final boolean validatePrecisionAndScale(final String value, final EdmFacets facets) {
if (facets == null || facets.getPrecision() == null && facets.getScale() == null) {
return true;
}
final Matcher matcher = PATTERN.matcher(value);
matcher.matches();
final int significantIntegerDigits = matcher.group(1).equals("0") ? 0 : matcher.group(1).length();
final int decimals = matcher.group(2) == null ? 0 : matcher.group(2).length();
return (facets.getPrecision() == null || facets.getPrecision() >= significantIntegerDigits + decimals)
&& (facets.getScale() == null || facets.getScale() >= decimals);
}
@Override
protected <T> T internalValueOfString(final String value, final EdmLiteralKind literalKind, final EdmFacets facets, final Class<T> returnType) throws EdmSimpleTypeException {
if (!validateLiteral(value, literalKind)) {
throw new EdmSimpleTypeException(EdmSimpleTypeException.LITERAL_ILLEGAL_CONTENT.addContent(value));
}
if (!validatePrecisionAndScale(value, facets)) {
throw new EdmSimpleTypeException(EdmSimpleTypeException.LITERAL_FACETS_NOT_MATCHED.addContent(value, facets));
}
final BigDecimal valueBigDecimal = new BigDecimal(
literalKind == EdmLiteralKind.URI ? value.substring(0, value.length() - 1) : value);
if (returnType.isAssignableFrom(BigDecimal.class)) {
return returnType.cast(valueBigDecimal);
} else if (returnType.isAssignableFrom(Double.class)) {
if (BigDecimal.valueOf(valueBigDecimal.doubleValue()).compareTo(valueBigDecimal) == 0) {
return returnType.cast(valueBigDecimal.doubleValue());
} else {
throw new EdmSimpleTypeException(EdmSimpleTypeException.LITERAL_UNCONVERTIBLE_TO_VALUE_TYPE.addContent(value, returnType));
}
} else if (returnType.isAssignableFrom(Float.class)) {
if (BigDecimal.valueOf(valueBigDecimal.floatValue()).compareTo(valueBigDecimal) == 0) {
return returnType.cast(valueBigDecimal.floatValue());
} else {
throw new EdmSimpleTypeException(EdmSimpleTypeException.LITERAL_UNCONVERTIBLE_TO_VALUE_TYPE.addContent(value, returnType));
}
} else {
try {
if (returnType.isAssignableFrom(BigInteger.class)) {
return returnType.cast(valueBigDecimal.toBigIntegerExact());
} else if (returnType.isAssignableFrom(Long.class)) {
return returnType.cast(valueBigDecimal.longValueExact());
} else if (returnType.isAssignableFrom(Integer.class)) {
return returnType.cast(valueBigDecimal.intValueExact());
} else if (returnType.isAssignableFrom(Short.class)) {
return returnType.cast(valueBigDecimal.shortValueExact());
} else if (returnType.isAssignableFrom(Byte.class)) {
return returnType.cast(valueBigDecimal.byteValueExact());
} else {
throw new EdmSimpleTypeException(EdmSimpleTypeException.VALUE_TYPE_NOT_SUPPORTED.addContent(returnType));
}
} catch (final ArithmeticException e) {
throw new EdmSimpleTypeException(EdmSimpleTypeException.LITERAL_UNCONVERTIBLE_TO_VALUE_TYPE.addContent(value, returnType), e);
}
}
}
@Override
protected <T> String internalValueToString(final T value, final EdmLiteralKind literalKind, final EdmFacets facets) throws EdmSimpleTypeException {
String result;
if (value instanceof Long || value instanceof Integer || value instanceof Short || value instanceof Byte || value instanceof BigInteger) {
result = value.toString();
final int digits = result.startsWith("-") ? result.length() - 1 : result.length();
if (digits > MAX_DIGITS) {
throw new EdmSimpleTypeException(EdmSimpleTypeException.VALUE_ILLEGAL_CONTENT.addContent(value));
}
if (facets != null && facets.getPrecision() != null && facets.getPrecision() < digits) {
throw new EdmSimpleTypeException(EdmSimpleTypeException.VALUE_FACETS_NOT_MATCHED.addContent(value, facets));
}
} else if (value instanceof Double || value instanceof Float || value instanceof BigDecimal) {
BigDecimal bigDecimalValue;
try {
if (value instanceof Double) {
bigDecimalValue = BigDecimal.valueOf((Double) value);
} else if (value instanceof Float) {
bigDecimalValue = BigDecimal.valueOf((Float) value);
} else {
bigDecimalValue = (BigDecimal) value;
}
} catch (final NumberFormatException e) {
throw new EdmSimpleTypeException(EdmSimpleTypeException.VALUE_ILLEGAL_CONTENT.addContent(value), e);
}
if (bigDecimalValue.precision() - bigDecimalValue.scale() > MAX_DIGITS
|| bigDecimalValue.scale() > MAX_DIGITS) {
throw new EdmSimpleTypeException(EdmSimpleTypeException.VALUE_ILLEGAL_CONTENT.addContent(value));
}
final int digits = bigDecimalValue.scale() >= 0 ?
Math.max(bigDecimalValue.precision(), bigDecimalValue.scale()) :
bigDecimalValue.precision() - bigDecimalValue.scale();
if (facets == null
|| (facets.getPrecision() == null || facets.getPrecision() >= digits)
&& (facets.getScale() == null || facets.getScale() >= bigDecimalValue.scale())) {
result = bigDecimalValue.toPlainString();
} else {
throw new EdmSimpleTypeException(EdmSimpleTypeException.VALUE_FACETS_NOT_MATCHED.addContent(value, facets));
}
} else {
throw new EdmSimpleTypeException(EdmSimpleTypeException.VALUE_TYPE_NOT_SUPPORTED.addContent(value.getClass()));
}
return result;
}
@Override
public String toUriLiteral(final String literal) throws EdmSimpleTypeException {
return literal + "M";
}
}