import com.sun.org.apache.xerces.internal.util.FeatureState; //导入依赖的package包/类
/**
 * Check a feature. If feature is know and supported, this method simply
 * returns. Otherwise, the appropriate exception is thrown.
 *
 * @param featureId The unique identifier (URI) of the feature.
 *
 * @throws XMLConfigurationException Thrown for configuration error.
 *                                   In general, components should
 *                                   only throw this exception if
 *                                   it is <strong>really</strong>
 *                                   a critical error.
 */
protected FeatureState checkFeature(String featureId)
    throws XMLConfigurationException {

    //
    // Xerces Features
    //
    if (featureId.startsWith(Constants.XERCES_FEATURE_PREFIX)) {
        final int suffixLength = featureId.length() - Constants.XERCES_FEATURE_PREFIX.length();

        //
        // special performance feature: no one by component manager is allowed to set it
        //
        if (suffixLength == Constants.PARSER_SETTINGS.length() &&
            featureId.endsWith(Constants.PARSER_SETTINGS)) {
            return FeatureState.NOT_SUPPORTED;
        }
    }

    return super.checkFeature(featureId);
 }
 

import com.sun.org.apache.xerces.internal.util.FeatureState; //导入依赖的package包/类
/**
 * Returns the state of a feature.
 *
 * @param featureId The feature identifier.
 * @return true if the feature is supported
 *
 * @throws XMLConfigurationException Thrown for configuration error.
 *                                   In general, components should
 *                                   only throw this exception if
 *                                   it is <strong>really</strong>
 *                                   a critical error.
 */
public FeatureState getFeatureState(String featureId)
        throws XMLConfigurationException {
    if (PARSER_SETTINGS.equals(featureId)) {
        return FeatureState.is(fConfigUpdated);
    }
    else if (VALIDATION.equals(featureId) || SCHEMA_VALIDATION.equals(featureId)) {
        return FeatureState.is(true);
    }
    else if (USE_GRAMMAR_POOL_ONLY.equals(featureId)) {
        return FeatureState.is(fUseGrammarPoolOnly);
    }
    else if (XMLConstants.FEATURE_SECURE_PROCESSING.equals(featureId)) {
        return FeatureState.is(fInitSecurityManager.isSecureProcessing());
    }
    else if (SCHEMA_ELEMENT_DEFAULT.equals(featureId)) {
        return FeatureState.is(true); //pre-condition: VALIDATION and SCHEMA_VALIDATION are always true
    }
    return super.getFeatureState(featureId);
}
 

import com.sun.org.apache.xerces.internal.util.FeatureState; //导入依赖的package包/类
public FeatureState getFeatureState(String featureId)
    throws XMLConfigurationException {
    if (featureId.equals(PARSER_SETTINGS)) {
        return FeatureState.is(fConfigUpdated);
    }
    else if (featureId.equals(XINCLUDE_FEATURE)) {
        return FeatureState.is(fXIncludeEnabled);
    }
    return super.getFeatureState0(featureId);

}
 

import com.sun.org.apache.xerces.internal.util.FeatureState; //导入依赖的package包/类
public FeatureState getFeatureState(String featureId)
        throws XMLConfigurationException {
                // make this feature special
        if (featureId.equals(PARSER_SETTINGS)){
                return FeatureState.is(fConfigUpdated);
        }
        return super.getFeatureState(featureId);

}
 

import com.sun.org.apache.xerces.internal.util.FeatureState; //导入依赖的package包/类
public FeatureState getFeatureState(String featureId) {
    if (PARSER_SETTINGS.equals(featureId)) {
        return fParentComponentManager.getFeatureState(featureId);
    }
    else if (VALIDATION.equals(featureId) || SCHEMA_VALIDATION.equals(featureId)) {
        return FeatureState.is(true);
    }
    else if (USE_GRAMMAR_POOL_ONLY.equals(featureId)) {
        return FeatureState.is(fUseGrammarPoolOnly);
    }
    return fParentComponentManager.getFeatureState(featureId);
}
 

import com.sun.org.apache.xerces.internal.util.FeatureState; //导入依赖的package包/类
public boolean getFeature(String featureId, boolean defaultValue) {
    FeatureState state = getFeatureState(featureId);
    if (state.isExceptional()) {
        return defaultValue;
    }
    return state.state;
}