Java Class Loader loadArrayClass(ClassLoader cl, String aName)

Description

load Array Class

License

Open Source License

Declaration

private static Class<?> loadArrayClass(ClassLoader cl, String aName) 

Method Source Code

//package com.java2s;
/*/*from  w  w  w  .ja  va 2s.  c o  m*/
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 * obtain a copy of the License at
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import java.lang.reflect.Array;

public class Main {
    private static Class<?> loadArrayClass(ClassLoader cl, String aName) {
        Class<?> componentType = null;
        int[] dimensions = null;

        int dot = 0;
        while (componentType == null) {
            char dotChar = aName.charAt(dot);
            if (dotChar == '[') {
                dot++;
                continue;
            }

            dimensions = new int[dot];
            for (int lcv = 0; lcv < dot; lcv++) {
                dimensions[lcv] = 0;
            }

            if (dotChar == 'B') {
                componentType = byte.class;
            } else if (dotChar == 'I') {
                componentType = int.class;
            } else if (dotChar == 'J') {
                componentType = long.class;
            } else if (dotChar == 'Z') {
                componentType = boolean.class;
            } else if (dotChar == 'S') {
                componentType = short.class;
            } else if (dotChar == 'C') {
                componentType = char.class;
            } else if (dotChar == 'D') {
                componentType = double.class;
            } else if (dotChar == 'F') {
                componentType = float.class;
            } else {
                if (dotChar != 'L') {
                    throw new IllegalArgumentException("Unknown array type " + aName);
                }

                if (aName.charAt(aName.length() - 1) != ';') {
                    throw new IllegalArgumentException("Badly formed L array expresion: " + aName);
                }

                String cName = aName.substring(dot + 1, aName.length() - 1);

                componentType = loadClass(cl, cName);
                if (componentType == null)
                    return null;
            }
        }

        Object retArray = Array.newInstance(componentType, dimensions);
        return retArray.getClass();
    }

    /**
     * Loads the class from the given classloader or returns null (does not throw).
     * Property handles array classes as well
     * 
     * @param cl The non-null classloader to load the class from
     * @param cName The fully qualified non-null name of the class to load
     * @return The class if it could be loaded from the classloader, or
     * null if it could not be found for any reason
     */
    public static Class<?> loadClass(ClassLoader cl, String cName) {
        if (cName.startsWith("[")) {
            return loadArrayClass(cl, cName);
        }

        try {
            return cl.loadClass(cName);
        } catch (Throwable th) {
            return null;
        }
    }
}

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