/*
* Based on JUEL 2.2.1 code, 2006-2009 Odysseus Software GmbH
*
* 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.activiti.engine.impl.juel;
import java.beans.PropertyEditor;
import java.beans.PropertyEditorManager;
import java.math.BigDecimal;
import java.math.BigInteger;
import org.activiti.engine.impl.javax.el.ELException;
/**
* Type Conversions as described in EL 2.1 specification (section 1.17).
*/
public class TypeConverterImpl implements TypeConverter {
private static final long serialVersionUID = 1L;
protected Boolean coerceToBoolean(Object value) {
if (value == null || "".equals(value)) {
return Boolean.FALSE;
}
if (value instanceof Boolean) {
return (Boolean)value;
}
if (value instanceof String) {
return Boolean.valueOf((String)value);
}
throw new ELException(LocalMessages.get("error.coerce.type", value.getClass(), Boolean.class));
}
protected Character coerceToCharacter(Object value) {
if (value == null || "".equals(value)) {
return Character.valueOf((char)0);
}
if (value instanceof Character) {
return (Character)value;
}
if (value instanceof Number) {
return Character.valueOf((char)((Number)value).shortValue());
}
if (value instanceof String) {
return Character.valueOf(((String)value).charAt(0));
}
throw new ELException(LocalMessages.get("error.coerce.type", value.getClass(), Character.class));
}
protected BigDecimal coerceToBigDecimal(Object value) {
if (value == null || "".equals(value)) {
return BigDecimal.valueOf(0l);
}
if (value instanceof BigDecimal) {
return (BigDecimal)value;
}
if (value instanceof BigInteger) {
return new BigDecimal((BigInteger)value);
}
if (value instanceof Number) {
return new BigDecimal(((Number)value).doubleValue());
}
if (value instanceof String) {
try {
return new BigDecimal((String)value);
} catch (NumberFormatException e) {
throw new ELException(LocalMessages.get("error.coerce.value", value, BigDecimal.class));
}
}
if (value instanceof Character) {
return new BigDecimal((short)((Character)value).charValue());
}
throw new ELException(LocalMessages.get("error.coerce.type", value.getClass(), BigDecimal.class));
}
protected BigInteger coerceToBigInteger(Object value) {
if (value == null || "".equals(value)) {
return BigInteger.valueOf(0l);
}
if (value instanceof BigInteger) {
return (BigInteger)value;
}
if (value instanceof BigDecimal) {
return ((BigDecimal)value).toBigInteger();
}
if (value instanceof Number) {
return BigInteger.valueOf(((Number)value).longValue());
}
if (value instanceof String) {
try {
return new BigInteger((String)value);
} catch (NumberFormatException e) {
throw new ELException(LocalMessages.get("error.coerce.value", value, BigInteger.class));
}
}
if (value instanceof Character) {
return BigInteger.valueOf((short)((Character)value).charValue());
}
throw new ELException(LocalMessages.get("error.coerce.type", value.getClass(), BigInteger.class));
}
protected Double coerceToDouble(Object value) {
if (value == null || "".equals(value)) {
return Double.valueOf(0);
}
if (value instanceof Double) {
return (Double)value;
}
if (value instanceof Number) {
return Double.valueOf(((Number)value).doubleValue());
}
if (value instanceof String) {
try {
return Double.valueOf((String)value);
} catch (NumberFormatException e) {
throw new ELException(LocalMessages.get("error.coerce.value", value, Double.class));
}
}
if (value instanceof Character) {
return Double.valueOf((short)((Character)value).charValue());
}
throw new ELException(LocalMessages.get("error.coerce.type", value.getClass(), Double.class));
}
protected Float coerceToFloat(Object value) {
if (value == null || "".equals(value)) {
return Float.valueOf(0);
}
if (value instanceof Float) {
return (Float)value;
}
if (value instanceof Number) {
return Float.valueOf(((Number)value).floatValue());
}
if (value instanceof String) {
try {
return Float.valueOf((String)value);
} catch (NumberFormatException e) {
throw new ELException(LocalMessages.get("error.coerce.value", value, Float.class));
}
}
if (value instanceof Character) {
return Float.valueOf((short)((Character)value).charValue());
}
throw new ELException(LocalMessages.get("error.coerce.type", value.getClass(), Float.class));
}
protected Long coerceToLong(Object value) {
if (value == null || "".equals(value)) {
return Long.valueOf(0l);
}
if (value instanceof Long) {
return (Long)value;
}
if (value instanceof Number) {
return Long.valueOf(((Number)value).longValue());
}
if (value instanceof String) {
try {
return Long.valueOf((String)value);
} catch (NumberFormatException e) {
throw new ELException(LocalMessages.get("error.coerce.value", value, Long.class));
}
}
if (value instanceof Character) {
return Long.valueOf((short)((Character)value).charValue());
}
throw new ELException(LocalMessages.get("error.coerce.type", value.getClass(), Long.class));
}
protected Integer coerceToInteger(Object value) {
if (value == null || "".equals(value)) {
return Integer.valueOf(0);
}
if (value instanceof Integer) {
return (Integer)value;
}
if (value instanceof Number) {
return Integer.valueOf(((Number)value).intValue());
}
if (value instanceof String) {
try {
return Integer.valueOf((String)value);
} catch (NumberFormatException e) {
throw new ELException(LocalMessages.get("error.coerce.value", value, Integer.class));
}
}
if (value instanceof Character) {
return Integer.valueOf((short)((Character)value).charValue());
}
throw new ELException(LocalMessages.get("error.coerce.type", value.getClass(), Integer.class));
}
protected Short coerceToShort(Object value) {
if (value == null || "".equals(value)) {
return Short.valueOf((short)0);
}
if (value instanceof Short) {
return (Short)value;
}
if (value instanceof Number) {
return Short.valueOf(((Number)value).shortValue());
}
if (value instanceof String) {
try {
return Short.valueOf((String)value);
} catch (NumberFormatException e) {
throw new ELException(LocalMessages.get("error.coerce.value", value, Short.class));
}
}
if (value instanceof Character) {
return Short.valueOf((short)((Character)value).charValue());
}
throw new ELException(LocalMessages.get("error.coerce.type", value.getClass(), Short.class));
}
protected Byte coerceToByte(Object value) {
if (value == null || "".equals(value)) {
return Byte.valueOf((byte)0);
}
if (value instanceof Byte) {
return (Byte)value;
}
if (value instanceof Number) {
return Byte.valueOf(((Number)value).byteValue());
}
if (value instanceof String) {
try {
return Byte.valueOf((String)value);
} catch (NumberFormatException e) {
throw new ELException(LocalMessages.get("error.coerce.value", value, Byte.class));
}
}
if (value instanceof Character) {
return Byte.valueOf(Short.valueOf((short)((Character)value).charValue()).byteValue());
}
throw new ELException(LocalMessages.get("error.coerce.type", value.getClass(), Byte.class));
}
protected String coerceToString(Object value) {
if (value == null) {
return "";
}
if (value instanceof String) {
return (String)value;
}
if (value instanceof Enum<?>) {
return ((Enum<?>)value).name();
}
return value.toString();
}
@SuppressWarnings("unchecked")
protected <T extends Enum<T>> T coerceToEnum(Object value, Class<T> type) {
if (value == null || "".equals(value)) {
return null;
}
if (type.isInstance(value)) {
return (T)value;
}
if (value instanceof String) {
try {
return Enum.valueOf(type, (String)value);
} catch (IllegalArgumentException e) {
throw new ELException(LocalMessages.get("error.coerce.value", value, type));
}
}
throw new ELException(LocalMessages.get("error.coerce.type", value.getClass(), type));
}
protected Object coerceStringToType(String value, Class<?> type) {
PropertyEditor editor = PropertyEditorManager.findEditor(type);
if (editor == null) {
if ("".equals(value)) {
return null;
}
throw new ELException(LocalMessages.get("error.coerce.type", String.class, type));
} else {
if ("".equals(value)) {
try {
editor.setAsText(value);
} catch (IllegalArgumentException e) {
return null;
}
} else {
try {
editor.setAsText(value);
} catch (IllegalArgumentException e) {
throw new ELException(LocalMessages.get("error.coerce.value", value, type));
}
}
return editor.getValue();
}
}
@SuppressWarnings("unchecked")
protected Object coerceToType(Object value, Class<?> type) {
if (type == String.class) {
return coerceToString(value);
}
if (type == Long.class || type == long.class) {
return coerceToLong(value);
}
if (type == Double.class || type == double.class) {
return coerceToDouble(value);
}
if (type == Boolean.class || type == boolean.class) {
return coerceToBoolean(value);
}
if (type == Integer.class || type == int.class) {
return coerceToInteger(value);
}
if (type == Float.class || type == float.class) {
return coerceToFloat(value);
}
if (type == Short.class || type == short.class) {
return coerceToShort(value);
}
if (type == Byte.class || type == byte.class) {
return coerceToByte(value);
}
if (type == Character.class || type == char.class) {
return coerceToCharacter(value);
}
if (type == BigDecimal.class) {
return coerceToBigDecimal(value);
}
if (type == BigInteger.class) {
return coerceToBigInteger(value);
}
if (type.getSuperclass() == Enum.class) {
return coerceToEnum(value, (Class<? extends Enum>)type);
}
if (value == null || value.getClass() == type || type.isInstance(value)) {
return value;
}
if (value instanceof String) {
return coerceStringToType((String)value, type);
}
throw new ELException(LocalMessages.get("error.coerce.type", value.getClass(), type));
}
@Override
public boolean equals(Object obj) {
return obj != null && obj.getClass().equals(getClass());
}
@Override
public int hashCode() {
return getClass().hashCode();
}
@SuppressWarnings("unchecked")
public <T> T convert(Object value, Class<T> type) throws ELException {
return (T)coerceToType(value, type);
}
}