A.java

/**
 *  Copyright 2014-2017 Riccardo Massera (TheCoder4.Eu)
 *  
 *  This file is part of BootsFaces.
 *  
* 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 net.bootsfaces.render;

import java.util.Map;

/**
 * Attributes Constants
 * @author thecoder4.eu
 */
public final class A {
    /** Converts the parameter to an integer value, if possible.
     * Throws an IllegalArgumentException if the parameter cannot be converted to an integer.
     * 
     * @param val the parameter to be converted. May be a String, a number or null. Everything else causes an {@link IllegalArgumentException} to be thrown.
     * @return the integer value. 0 if the parameter is null.
     */
    public static int toInt(Object val) {
        if (val == null) { return 0; }
        if (val instanceof Number) {
            return ((Number) val).intValue();
        }
        if (val instanceof String) {
            return Integer.parseInt((String) val);
        }
        
        throw new IllegalArgumentException("Cannot convert " + val);
    }
    public static float toFloat(Object val) {
        if (val == null) { return 0; }
        if (val instanceof Number) {
            return ((Number) val).floatValue();
        }
        if (val instanceof String) {
            return Float.parseFloat((String) val);
        }
        
        throw new IllegalArgumentException("Cannot convert " + val);
    }
    public static double toDouble(Object val) {
        if (val == null) { return 0; }
        if (val instanceof Number) {
            return ((Number) val).doubleValue();
        }
        if (val instanceof String) {
            return Double.parseDouble((String) val);
        }
        
        throw new IllegalArgumentException("Cannot convert " + val);
    }
        
    public static boolean toBool(Object val) {
        if (val == null) { return false; }
        if (val instanceof Boolean) {
            return ((Boolean) val).booleanValue();
        }
        if (val instanceof String) {
            return ((String) val).equals("true");
        }
        if (val instanceof Number) {
            return ((Number) val).intValue() > 0;
        }
        throw new IllegalArgumentException("Cannot convert " + val);
    }
    public static boolean toBool(Object val, boolean d) {
        if (val == null) { return d; }
        return toBool(val);
    }
     
    public static String asString(Object val) {
        if (val == null) { return null; }
        return val.toString();
    }
    public static String asString(Object val, String d) { //if null returns suppled default value
        if (val == null) { return d; }
        return val.toString();
    }
    
    public static String asString(Map<String, Object> attrs, Object o) {
        return asString(attrs.get(o.toString()));
    }
    
    
    /**
     * This is a utility class which is not intended to be instantiated.
     * Suppress default constructor for noninstantiability.
     */
    private A() {
        throw new AssertionError();
    }

}