/*******************************************************************************
* 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.util.Locale;
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 Single.
* @author SAP AG
*/
public class EdmSingle extends AbstractSimpleType {
// value-range limitations according to the CSDL document
private static final int MAX_PRECISION = 7;
private static final int MAX_SCALE = 38;
private static final Pattern PATTERN = Pattern.compile(
"(?:\\+|-)?\\p{Digit}{1,7}(?:\\.\\p{Digit}{1,7})?(?:(?:E|e)(?:\\+|-)?\\p{Digit}{1,2})?(F|f)?");
private static final EdmSingle instance = new EdmSingle();
public static EdmSingle 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;
}
@Override
public Class<?> getDefaultType() {
return Float.class;
}
@Override
protected <T> T internalValueOfString(final String value, final EdmLiteralKind literalKind, final EdmFacets facets, final Class<T> returnType) throws EdmSimpleTypeException {
String valueString = value;
Float result = null;
// Handle special values first.
if (value.equals("-INF")) {
result = Float.NEGATIVE_INFINITY;
} else if (value.equals("INF")) {
result = Float.POSITIVE_INFINITY;
} else if (value.equals("NaN")) {
result = Float.NaN;
} else {
// Now only "normal" numbers remain.
final Matcher matcher = PATTERN.matcher(value);
if (!matcher.matches()
|| (literalKind == EdmLiteralKind.URI) == (matcher.group(1) == null)) {
throw new EdmSimpleTypeException(EdmSimpleTypeException.LITERAL_ILLEGAL_CONTENT.addContent(value));
}
if (literalKind == EdmLiteralKind.URI) {
valueString = value.substring(0, value.length() - 1);
}
// The number format is checked above, so we don't have to catch NumberFormatException.
result = Float.valueOf(valueString);
// "Real" infinite values have been treated already above, so we can throw an exception
// if the conversion to a float results in an infinite value.
if (result.isInfinite()) {
throw new EdmSimpleTypeException(EdmSimpleTypeException.LITERAL_ILLEGAL_CONTENT.addContent(value));
}
}
if (returnType.isAssignableFrom(Float.class)) {
return returnType.cast(result);
} else if (returnType.isAssignableFrom(Double.class)) {
if (result.isInfinite() || result.isNaN()) {
return returnType.cast(result.doubleValue());
} else {
return returnType.cast(Double.valueOf(valueString));
}
} else if (result.isInfinite() || result.isNaN()) {
throw new EdmSimpleTypeException(EdmSimpleTypeException.LITERAL_UNCONVERTIBLE_TO_VALUE_TYPE.addContent(value, returnType));
} else {
try {
final BigDecimal valueBigDecimal = new BigDecimal(valueString);
if (returnType.isAssignableFrom(BigDecimal.class)) {
return returnType.cast(valueBigDecimal);
} 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 {
if (value instanceof Long || value instanceof Integer) {
if (Math.abs(((Number) value).longValue()) < Math.pow(10, MAX_PRECISION)) {
return value.toString();
} else {
throw new EdmSimpleTypeException(EdmSimpleTypeException.VALUE_ILLEGAL_CONTENT.addContent(value));
}
} else if (value instanceof Short || value instanceof Byte) {
return value.toString();
} else if (value instanceof Double) {
if (((Double) value).isInfinite()) {
return value.toString().toUpperCase(Locale.ROOT).substring(0, value.toString().length() - 5);
} else if (Float.isInfinite(((Double) value).floatValue())) {
throw new EdmSimpleTypeException(EdmSimpleTypeException.VALUE_ILLEGAL_CONTENT.addContent(value));
} else {
return Float.toString(((Double) value).floatValue());
}
} else if (value instanceof Float) {
final String result = value.toString();
return ((Float) value).isInfinite() ? result.toUpperCase(Locale.ROOT).substring(0, value.toString().length() - 5) : result;
} else if (value instanceof BigDecimal) {
if (((BigDecimal) value).precision() <= MAX_PRECISION && Math.abs(((BigDecimal) value).scale()) <= MAX_SCALE) {
return ((BigDecimal) value).toString();
} else {
throw new EdmSimpleTypeException(EdmSimpleTypeException.VALUE_ILLEGAL_CONTENT.addContent(value));
}
} else {
throw new EdmSimpleTypeException(EdmSimpleTypeException.VALUE_TYPE_NOT_SUPPORTED.addContent(value.getClass()));
}
}
@Override
public String toUriLiteral(final String literal) {
return literal.equals("-INF") || literal.equals("INF") || literal.equals("NaN") ?
literal : literal + "F";
}
}