Example usage for java.lang.reflect Field getByte

Introduction

In this page you can find the example usage for java.lang.reflect Field getByte.

Prototype

@CallerSensitive
@ForceInline 
public byte getByte(Object obj) throws IllegalArgumentException, IllegalAccessException 

Source Link

Document

Gets the value of a static or instance byte field.

Usage

From source file:cn.edu.zafu.corepage.base.BaseActivity.java

/**
 * ??//from  www.  j a  v  a2 s  . c  o  m
 *
 * @param outState Bundle
 */
@Override
protected void onSaveInstanceState(Bundle outState) {
    Field[] fields = this.getClass().getDeclaredFields();
    Field.setAccessible(fields, true);
    Annotation[] ans;
    for (Field f : fields) {
        ans = f.getDeclaredAnnotations();
        for (Annotation an : ans) {
            if (an instanceof SaveWithActivity) {
                try {
                    Object o = f.get(this);
                    if (o == null) {
                        continue;
                    }
                    String fieldName = f.getName();
                    if (o instanceof Integer) {
                        outState.putInt(fieldName, f.getInt(this));
                    } else if (o instanceof String) {
                        outState.putString(fieldName, (String) f.get(this));
                    } else if (o instanceof Long) {
                        outState.putLong(fieldName, f.getLong(this));
                    } else if (o instanceof Short) {
                        outState.putShort(fieldName, f.getShort(this));
                    } else if (o instanceof Boolean) {
                        outState.putBoolean(fieldName, f.getBoolean(this));
                    } else if (o instanceof Byte) {
                        outState.putByte(fieldName, f.getByte(this));
                    } else if (o instanceof Character) {
                        outState.putChar(fieldName, f.getChar(this));
                    } else if (o instanceof CharSequence) {
                        outState.putCharSequence(fieldName, (CharSequence) f.get(this));
                    } else if (o instanceof Float) {
                        outState.putFloat(fieldName, f.getFloat(this));
                    } else if (o instanceof Double) {
                        outState.putDouble(fieldName, f.getDouble(this));
                    } else if (o instanceof String[]) {
                        outState.putStringArray(fieldName, (String[]) f.get(this));
                    } else if (o instanceof Parcelable) {
                        outState.putParcelable(fieldName, (Parcelable) f.get(this));
                    } else if (o instanceof Serializable) {
                        outState.putSerializable(fieldName, (Serializable) f.get(this));
                    } else if (o instanceof Bundle) {
                        outState.putBundle(fieldName, (Bundle) f.get(this));
                    }
                } catch (IllegalArgumentException e) {
                    e.printStackTrace();
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    super.onSaveInstanceState(outState);
}

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From source file:org.rhq.enterprise.gui.legacy.taglib.ConstantsTag.java

public int doEndTag() throws JspException {
    try {//from   ww w . ja va 2s. c o  m
        JspWriter out = pageContext.getOut();
        if (className == null) {
            className = pageContext.getServletContext().getInitParameter(constantsClassNameParam);
        }

        if (validate(out)) {
            // we're misconfigured. getting this far
            // is a matter of what our failure mode is;
            // if we haven't thrown an Error, carry on
            log.debug("constants tag misconfigured");
            return EVAL_PAGE;
        }

        Map<String, String> fieldMap;
        if (constants.containsKey(className)) {
            // we cache the result of the constant's class
            // reflection field walk as a map
            fieldMap = (Map<String, String>) constants.get(className);
        } else {
            fieldMap = new HashMap<String, String>();
            Class typeClass = Class.forName(className);
            if (typeClass.isEnum()) {
                for (Object enumConstantObj : typeClass.getEnumConstants()) {
                    Enum enumConstant = (Enum) enumConstantObj;

                    // Set name *and* value to enum name (e.g. name of ResourceCategory.PLATFORM = "PLATFORM")
                    // NOTE: We do not set the value to enumConstant.ordinal(), because there is no way to
                    // convert the ordinal value back to an Enum (i.e. no Enum.valueOf(int ordinal) method).
                    fieldMap.put(enumConstant.name(), enumConstant.name());
                }
            } else {
                Object instance = typeClass.newInstance();
                Field[] fields = typeClass.getFields();
                for (Field field : fields) {
                    // string comparisons of class names should be cheaper
                    // than reflective Class comparisons, the asumption here
                    // is that most constants are Strings, ints and booleans
                    // but a minimal effort is made to accomadate all types
                    // and represent them as String's for our tag's output
                    String fieldType = field.getType().getName();
                    String strVal;
                    if (fieldType.equals("java.lang.String")) {
                        strVal = (String) field.get(instance);
                    } else if (fieldType.equals("int")) {
                        strVal = Integer.toString(field.getInt(instance));
                    } else if (fieldType.equals("boolean")) {
                        strVal = Boolean.toString(field.getBoolean(instance));
                    } else if (fieldType.equals("char")) {
                        strVal = Character.toString(field.getChar(instance));
                    } else if (fieldType.equals("double")) {
                        strVal = Double.toString(field.getDouble(instance));
                    } else if (fieldType.equals("float")) {
                        strVal = Float.toString(field.getFloat(instance));
                    } else if (fieldType.equals("long")) {
                        strVal = Long.toString(field.getLong(instance));
                    } else if (fieldType.equals("short")) {
                        strVal = Short.toString(field.getShort(instance));
                    } else if (fieldType.equals("byte")) {
                        strVal = Byte.toString(field.getByte(instance));
                    } else {
                        strVal = field.get(instance).toString();
                    }

                    fieldMap.put(field.getName(), strVal);
                }
            }

            // cache the result
            constants.put(className, fieldMap);
        }

        if ((symbol != null) && !fieldMap.containsKey(symbol)) {
            // tell the developer that he's being a dummy and what
            // might be done to remedy the situation
            // TODO: what happens if the constants change?
            // do we need to throw a JspException, here? - mtk
            String err1 = symbol + " was not found in " + className + "\n";
            String err2 = err1 + "use <constants:diag classname=\"" + className + "\"/>\n"
                    + "to figure out what you're looking for";
            log.error(err2);
            die(out, err1);
        }

        if (varSpecified) {
            doSet(fieldMap);
        } else {
            doOutput(fieldMap, out);
        }
    } catch (JspException e) {
        throw e;
    } catch (Exception e) {
        log.debug("doEndTag() failed: ", e);
        throw new JspException("Could not access constants tag", e);
    }

    return EVAL_PAGE;
}

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