Example usage for java.lang Class getField

List of usage examples for java.lang Class getField

  1. HOME
  2. Java
  3. java
  4. java.lang.*
  5. Class
  6. getField

Introduction

In this page you can find the example usage for java.lang Class getField.

Prototype

@CallerSensitive
public Field getField(String name) throws NoSuchFieldException, SecurityException

Source Link

Document

Returns a Field object that reflects the specified public member field of the class or interface represented by this Class object.

Usage

From source file:com.p5solutions.core.utils.ReflectionUtility.java

/**
 * Gets the static value.//from  w  w w . jav  a2  s. c  om
 *
 * @param <T> the generic type
 * @param clazz the clazz
 * @param memberName the member name
 * @return the static value
 */
@SuppressWarnings("unchecked")
public static <T> T getStaticValue(Class<?> clazz, String memberName) {
    try {
        Field field = clazz.getField(memberName);
        return (T) field.get(null);
    } catch (Exception e) {
        return null;
    }
}

From source file:alpha.portal.webapp.taglib.ConstantsTei.java

/**
 * Return information about the scripting variables to be created.
 * //  w ww  .  ja  v  a  2s  .com
 * @param data
 *            the input data
 * @return VariableInfo array of variable information
 */
@Override
public VariableInfo[] getVariableInfo(final TagData data) {
    // loop through and expose all attributes
    final List<VariableInfo> vars = new ArrayList<VariableInfo>();

    try {
        String clazz = data.getAttributeString("className");

        if (clazz == null) {
            clazz = Constants.class.getName();
        }

        final Class c = Class.forName(clazz);

        // if no var specified, get all
        if (data.getAttributeString("var") == null) {
            final Field[] fields = c.getDeclaredFields();

            AccessibleObject.setAccessible(fields, true);

            for (final Field field : fields) {
                final String type = field.getType().getName();
                vars.add(new VariableInfo(field.getName(),
                        ((field.getType().isArray()) ? type.substring(2, type.length() - 1) + "[]" : type),
                        true, VariableInfo.AT_END));
            }
        } else {
            final String var = data.getAttributeString("var");
            final String type = c.getField(var).getType().getName();
            vars.add(new VariableInfo(c.getField(var).getName(),
                    ((c.getField(var).getType().isArray()) ? type.substring(2, type.length() - 1) + "[]"
                            : type),
                    true, VariableInfo.AT_END));
        }
    } catch (final Exception cnf) {
        this.log.error(cnf.getMessage());
        cnf.printStackTrace();
    }

    return vars.toArray(new VariableInfo[] {});
}

From source file:com.netscape.cmstools.cli.MainCLI.java

public void convertCertStatusList(String list, Collection<Integer> statuses) throws Exception {

    if (list == null)
        return;/*from w  w  w .  j  a v a  2 s. c  o  m*/

    Class<SSLCertificateApprovalCallback.ValidityStatus> clazz = SSLCertificateApprovalCallback.ValidityStatus.class;

    for (String status : list.split(",")) {
        try {
            Field field = clazz.getField(status);
            statuses.add(field.getInt(null));

        } catch (NoSuchFieldException e) {
            throw new Exception("Invalid cert status \"" + status + "\".", e);
        }
    }
}

From source file:org.alfresco.repo.policy.PolicyComponentImpl.java

/**
 * Create a Policy Definition/*  w  ww  . j  a v  a2 s  .c om*/
 * 
 * @param policyIF  the policy interface
 * @return  the policy definition
 */
private PolicyDefinition createPolicyDefinition(Class policyIF) {
    // Extract Policy Namespace
    String namespaceURI = NamespaceService.DEFAULT_URI;
    try {
        Field metadata = policyIF.getField(ANNOTATION_NAMESPACE);
        if (!String.class.isAssignableFrom(metadata.getType())) {
            throw new PolicyException(
                    "NAMESPACE metadata incorrectly specified in policy " + policyIF.getCanonicalName());
        }
        namespaceURI = (String) metadata.get(null);
    } catch (NoSuchFieldException e) {
        // Assume default namespace
    } catch (IllegalAccessException e) {
        // Shouldn't get here (interface definitions must be accessible)
    }

    // Extract Policy Name
    Method[] methods = policyIF.getMethods();
    if (methods.length != 1) {
        throw new PolicyException("Policy " + policyIF.getCanonicalName() + " must declare only one method");
    }
    String name = methods[0].getName();

    // Extract Policy Arguments
    Class[] paramTypes = methods[0].getParameterTypes();
    Arg[] args = new Arg[paramTypes.length];
    for (int i = 0; i < paramTypes.length; i++) {
        // Extract Policy Arg
        args[i] = (i == 0) ? Arg.KEY : Arg.START_VALUE;
        try {
            Field argMetadata = policyIF.getField(ANNOTATION_ARG + i);
            if (!Arg.class.isAssignableFrom(argMetadata.getType())) {
                throw new PolicyException("ARG_" + i + " metadata incorrectly specified in policy "
                        + policyIF.getCanonicalName());
            }
            args[i] = (Arg) argMetadata.get(null);
            if (i == 0 && (!args[i].equals(Arg.KEY))) {
                throw new PolicyException(
                        "ARG_" + i + " specified in policy " + policyIF.getCanonicalName() + " must be a key");
            }
        } catch (NoSuchFieldException e) {
            // Assume default ARG configuration
        } catch (IllegalAccessException e) {
            // Shouldn't get here (interface definitions must be accessible)
        }
    }

    // Create Policy Definition
    return new PolicyDefinitionImpl(QName.createQName(namespaceURI, name), policyIF, args);
}

From source file:net.gsantner.opoc.util.ContextUtils.java

/**
 * Get field from ${applicationId}.BuildConfig
 * May be helpful in libraries, where a access to
 * BuildConfig would only get values of the library
 * rather than the app ones. It awaits a string resource
 * of the package set in manifest (root element).
 * Falls back to applicationId of the app which may differ from manifest.
 *//*from  ww  w. ja  va2 s. co  m*/
public Object getBuildConfigValue(String fieldName) {
    String pkg = getPackageIdManifest() + ".BuildConfig";
    try {
        Class<?> c = Class.forName(pkg);
        return c.getField(fieldName).get(null);
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    }
}

From source file:de.static_interface.sinksql.SqlDatabase.java

protected String addForeignKey(String sql, String name, Class<? extends AbstractTable> targetClass,
        String columnName, CascadeAction onUpdate, CascadeAction onDelete) {
    char bt = getBacktick();

    String tablename;//ww  w . j  a  va 2 s .  co  m
    try {
        tablename = targetClass.getField("TABLE_NAME").get(null).toString();
    } catch (IllegalAccessException e) {
        throw new RuntimeException(e);
    } catch (Exception e) {
        throw new RuntimeException("Static String Field TABLE_NAME was not declared in table wrapper class "
                + targetClass.getName() + "!", e);
    }

    sql += "FOREIGN KEY (" + bt + name + bt + ") REFERENCES " + getConnectionInfo().getTablePrefix() + tablename
            + " (" + bt + columnName + bt + ")";
    sql += " ON UPDATE " + onUpdate.toSql() + " ON DELETE " + onDelete.toSql();

    sql += ",";

    return sql;
}

From source file:ua.com.manometer.jasperreports.AbstractJasperReportsView.java

/**
 * Convert the given fully qualified field name to a corresponding
 * JRExporterParameter instance.//from  w  w w  . ja  v  a  2s  .  c o m
 * @param fqFieldName the fully qualified field name, consisting
 * of the class name followed by a dot followed by the field name
 * (e.g. "net.sf.jasperreports.engine.export.JRHtmlExporterParameter.IMAGES_URI")
 * @return the corresponding JRExporterParameter instance
 */
protected JRExporterParameter convertToExporterParameter(String fqFieldName) {
    int index = fqFieldName.lastIndexOf('.');
    if (index == -1 || index == fqFieldName.length()) {
        throw new IllegalArgumentException("Parameter name [" + fqFieldName + "] is not a valid static field. "
                + "The parameter name must map to a static field such as "
                + "[net.sf.jasperreports.engine.export.JRHtmlExporterParameter.IMAGES_URI]");
    }
    String className = fqFieldName.substring(0, index);
    String fieldName = fqFieldName.substring(index + 1);

    try {
        Class cls = ClassUtils.forName(className, getApplicationContext().getClassLoader());
        Field field = cls.getField(fieldName);

        if (JRExporterParameter.class.isAssignableFrom(field.getType())) {
            try {
                return (JRExporterParameter) field.get(null);
            } catch (IllegalAccessException ex) {
                throw new IllegalArgumentException("Unable to access field [" + fieldName + "] of class ["
                        + className + "]. " + "Check that it is static and accessible.");
            }
        } else {
            throw new IllegalArgumentException("Field [" + fieldName + "] on class [" + className
                    + "] is not assignable from JRExporterParameter - check the type of this field.");
        }
    } catch (ClassNotFoundException ex) {
        throw new IllegalArgumentException(
                "Class [" + className + "] in key [" + fqFieldName + "] could not be found.");
    } catch (NoSuchFieldException ex) {
        throw new IllegalArgumentException("Field [" + fieldName + "] in key [" + fqFieldName
                + "] could not be found on class [" + className + "].");
    }
}

From source file:edu.brown.api.BenchmarkConfig.java

@SuppressWarnings("unchecked")
public void loadConfigFile(File path) {
    try {/*from w  w w  .j a v  a2  s.  c om*/
        this.config = new PropertiesConfiguration(benchmark_conf_path);
    } catch (Exception ex) {
        throw new RuntimeException("Failed to load benchmark configuration file " + benchmark_conf_path);
    }

    Class<?> confClass = this.getClass();
    for (Object key : CollectionUtil.iterable(this.config.getKeys())) {
        String f_name = key.toString();
        String f_value = this.config.getString(f_name);

        // Always store whatever the property as a client parameter
        String paramName = (HStoreConstants.BENCHMARK_PARAM_PREFIX + f_name).toUpperCase();
        LOG.debug(String.format("Passing benchmark parameter to clients: %s = %s", paramName, f_value));
        clientParameters.put(paramName, f_value);

        Field f = null;
        try {
            f = confClass.getField(f_name);
        } catch (Exception ex) {
            // XXX LOG.warn("Invalid configuration property '" + f_name + "'. Ignoring...");
            continue;
        }
        assert (f != null);

        Class<?> f_class = f.getType();
        Object value = null;

        if (f_class.equals(int.class)) {
            value = this.config.getInt(f_name);
        } else if (f_class.equals(long.class)) {
            value = this.config.getLong(f_name);
        } else if (f_class.equals(double.class)) {
            value = this.config.getDouble(f_name);
        } else if (f_class.equals(boolean.class)) {
            value = this.config.getBoolean(f_name);
        } else if (f_class.equals(String.class)) {
            value = this.config.getString(f_name);
        } else {
            LOG.warn(String.format("Unexpected value type '%s' for property '%s'", f_class.getSimpleName(),
                    f_name));
        }

        try {
            f.set(this, value);
            LOG.info(String.format("SET %s = %s", f_name, value));
        } catch (Exception ex) {
            throw new RuntimeException("Failed to set value '" + value + "' for field '" + f_name + "'", ex);
        }
    } // FOR
}

From source file:com.easemob.chatuidemo.activity.BaseChatActivity.java

/**
 * ?gridview?view/*from   www.  ja v  a 2s. c om*/
 *
 * @param i
 * @return
 */
private View getGridChildView(int i) {
    View view = View.inflate(this, R.layout.expression_gridview, null);
    ExpandGridView gv = (ExpandGridView) view.findViewById(R.id.gridview);
    List<String> list = new ArrayList<String>();
    if (i == 1) {
        List<String> list1 = reslist.subList(0, 20);
        list.addAll(list1);
    } else if (i == 2) {
        list.addAll(reslist.subList(20, reslist.size()));
    }
    list.add("delete_expression");
    final ExpressionAdapter expressionAdapter = new ExpressionAdapter(this, 1, list);
    gv.setAdapter(expressionAdapter);
    gv.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            String filename = expressionAdapter.getItem(position);
            try {
                // ????
                // ?????
                //                    if (buttonSetModeKeyboard.getVisibility() != View.VISIBLE) {
                if (filename != "delete_expression") { // ?
                    // ????SmileUtils
                    Class clz = Class.forName("com.easemob.chatuidemo.utils.SmileUtils");
                    Field field = clz.getField(filename);
                    mEditTextContent
                            .append(SmileUtils.getSmiledText(BaseChatActivity.this, (String) field.get(null)));
                } else { // 
                    if (!TextUtils.isEmpty(mEditTextContent.getText())) {

                        int selectionStart = mEditTextContent.getSelectionStart();// ??
                        if (selectionStart > 0) {
                            String body = mEditTextContent.getText().toString();
                            String tempStr = body.substring(0, selectionStart);
                            int i = tempStr.lastIndexOf("[");// ???
                            if (i != -1) {
                                CharSequence cs = tempStr.substring(i, selectionStart);
                                if (SmileUtils.containsKey(cs.toString()))
                                    mEditTextContent.getEditableText().delete(i, selectionStart);
                                else
                                    mEditTextContent.getEditableText().delete(selectionStart - 1,
                                            selectionStart);
                            } else {
                                mEditTextContent.getEditableText().delete(selectionStart - 1, selectionStart);
                            }
                        }
                    }

                    //                        }
                }
            } catch (Exception e) {
            }

        }
    });
    return view;
}

From source file:com.android.tools.idea.uibuilder.model.NlComponent.java

@NotNull
public Insets getMargins() {
    if (myMargins == null) {
        if (viewInfo == null) {
            return Insets.NONE;
        }//from   ww  w  .j a v a2 s  . c  o m
        try {
            Object layoutParams = viewInfo.getLayoutParamsObject();
            Class<?> layoutClass = layoutParams.getClass();

            int left = fixDefault(layoutClass.getField("leftMargin").getInt(layoutParams));
            int top = fixDefault(layoutClass.getField("topMargin").getInt(layoutParams));
            int right = fixDefault(layoutClass.getField("rightMargin").getInt(layoutParams));
            int bottom = fixDefault(layoutClass.getField("bottomMargin").getInt(layoutParams));
            // Doesn't look like we need to read startMargin and endMargin here;
            // ViewGroup.MarginLayoutParams#doResolveMargins resolves and assigns values to the others

            if (left == 0 && top == 0 && right == 0 && bottom == 0) {
                myMargins = Insets.NONE;
            } else {
                myMargins = new Insets(left, top, right, bottom);
            }
        } catch (Throwable e) {
            myMargins = Insets.NONE;
        }
    }
    return myMargins;
}