- /*
- * Copyright 2002,2004 The Apache Software Foundation.
- *
- * 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.apache.commons.jexl.util;
-
- /**
- * Coercion utilities for the JSTL EL-like coercion.
- *
- * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
- */
- public class Coercion
- {
-
- public static Boolean coerceBoolean(Object val) {
- if (val == null)
- {
- return Boolean.FALSE;
- }
- else if (val instanceof Boolean)
- {
- return (Boolean) val;
- }
- else if (val instanceof String)
- {
- return Boolean.valueOf((String) val);
- }
-
- return null;
- }
-
- public static Integer coerceInteger(Object val)
- throws Exception
- {
- if (val == null)
- {
- return new Integer(0);
- }
- else if (val instanceof String)
- {
- if("".equals((String) val))
- return new Integer(0);
-
- return Integer.valueOf((String)val);
- }
- else if(val instanceof Character)
- {
- return new Integer((int)((Character)val).charValue());
- }
- else if(val instanceof Boolean)
- {
- throw new Exception("Boolean->Integer coercion exception");
- }
- else if(val instanceof Number)
- {
- return new Integer(((Number)val).intValue());
- }
-
- throw new Exception("Integer coercion exception");
- }
-
- public static Long coerceLong(Object val)
- throws Exception
- {
- if (val == null)
- {
- return new Long(0);
- }
- else if (val instanceof String)
- {
- if("".equals((String) val))
- return new Long(0);
-
- return Long.valueOf((String)val);
- }
- else if(val instanceof Character)
- {
- return new Long((long)((Character)val).charValue());
- }
- else if(val instanceof Boolean)
- {
- throw new Exception("Boolean->Integer coercion exception");
- }
- else if(val instanceof Number)
- {
- return new Long(((Number)val).longValue());
- }
-
- throw new Exception("Long coercion exception");
- }
-
- public static Double coerceDouble(Object val)
- throws Exception
- {
- if (val == null)
- {
- return new Double(0);
- }
- else if (val instanceof String)
- {
- if("".equals((String) val))
- return new Double(0);
-
- /*
- * the spec seems to be iffy about this. Going to give it a wack
- * anyway
- */
-
- return new Double((String) val);
- }
- else if(val instanceof Character)
- {
- int i = ((Character)val).charValue();
-
- return new Double(Double.parseDouble(String.valueOf(i)));
- }
- else if(val instanceof Boolean)
- {
- throw new Exception("Boolean->Integer coercion exception");
- }
- else if(val instanceof Double)
- {
- return (Double) val;
- }
- else if (val instanceof Number)
- {
- //The below construct is used rather than ((Number)val).doubleValue() to ensure
- //equality between comparint new Double( 6.4 / 3 ) and the jexl expression of 6.4 / 3
- return new Double(Double.parseDouble(String.valueOf(val)));
- }
-
- throw new Exception("Double coercion exception");
- }
-
- public static boolean isFloatingPoint( final Object o )
- {
- return o instanceof Float || o instanceof Double;
- }
-
- public static boolean isNumberable( final Object o )
- {
- return o instanceof Integer
- || o instanceof Long
- || o instanceof Byte
- || o instanceof Short
- || o instanceof Character;
- }
-
- }