Java Boolean Value From booleanValue(Object object)

Description

Converts the supplied object to boolean.

License

Apache License

Parameter

Parameter	Description
object	to convert

Return

boolean

Declaration

public static boolean booleanValue(Object object) 

Method Source Code

//package com.java2s;
/*//  w  w  w  .  j a v a2  s .  c  o  m
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */

public class Main {
    /**
     * Converts the supplied object to boolean.
     * @param object to convert
     * @return boolean
     */
    public static boolean booleanValue(Object object) {
        if (object instanceof Number) {
            double value = ((Number) object).doubleValue();
            final int negZero = -0;
            return value != 0 && value != negZero && !Double.isNaN(value);
        }
        if (object instanceof Boolean) {
            return ((Boolean) object).booleanValue();
        }
        //        if (object instanceof EvalContext) {
        //            EvalContext ctx = (EvalContext) object;
        //            Pointer ptr = ctx.getSingleNodePointer();
        //            return ptr == null ? false : booleanValue(ptr);
        //        }
        if (object instanceof String) {
            return ((String) object).length() != 0;
        }
        //        if (object instanceof NodePointer) {
        //            NodePointer pointer = (NodePointer) object;
        //            if (pointer instanceof VariablePointer) {
        //                return booleanValue(pointer.getNode());
        //            }
        //            pointer = pointer.getValuePointer();
        //            return pointer.isActual();
        //        }
        return object != null;
    }

    /**
     * Converts the supplied object to double.
     * @param object to convert
     * @return double
     */
    public static double doubleValue(Object object) {
        if (object instanceof Number) {
            return ((Number) object).doubleValue();
        }
        if (object instanceof Boolean) {
            return ((Boolean) object).booleanValue() ? 0.0 : 1.0;
        }
        if (object instanceof String) {
            if (object.equals("")) {
                return 0.0;
            }
            try {
                return Double.parseDouble((String) object);
            } catch (NumberFormatException ex) {
                return Double.NaN;
            }
        }
        //        if (object instanceof NodePointer) {
        //            return doubleValue(((NodePointer) object).getValue());
        //        }
        //        if (object instanceof EvalContext) {
        //            EvalContext ctx = (EvalContext) object;
        //            Pointer ptr = ctx.getSingleNodePointer();
        //            return ptr == null ? Double.NaN : doubleValue(ptr);
        //        }
        return doubleValue(stringValue(object));
    }

    /**
     * Converts the supplied object to String.
     * @param object to convert
     * @return String value
     */
    public static String stringValue(Object object) {
        if (object instanceof String) {
            return (String) object;
        }
        if (object instanceof Number) {
            double d = ((Number) object).doubleValue();
            long l = ((Number) object).longValue();
            return d == l ? String.valueOf(l) : String.valueOf(d);
        }
        if (object instanceof Boolean) {
            return ((Boolean) object).booleanValue() ? "true" : "false";
        }
        if (object == null) {
            return "";
        }
        //        if (object instanceof NodePointer) {
        //            return stringValue(((NodePointer) object).getValue());
        //        }
        //        if (object instanceof EvalContext) {
        //            EvalContext ctx = (EvalContext) object;
        //            Pointer ptr = ctx.getSingleNodePointer();
        //            return ptr == null ? "" : stringValue(ptr);
        //        }
        return String.valueOf(object);
    }
}

Related

1. booleanValue(Boolean value)
2. booleanValue(final Boolean booleanValue)
3. booleanValue(Object arg)
4. booleanValue(Object associationValue)
5. booleanValue(Object obj, boolean defaultValue)
6. booleanValue(Object value)
7. booleanValue(String s)
8. booleanValue(String s)
9. booleanValue(String s)