/**
    * Copyright 2005-2015 The Kuali Foundation
    *
    * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
    *
   * 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 org.kuali.rice.krad.data.metadata.impl;
  
  import java.beans.PropertyEditor;
  import java.util.Collections;
  import java.util.Set;
  
  import org.apache.commons.lang.StringUtils;
  import org.kuali.rice.core.api.data.DataType;
  import org.kuali.rice.krad.data.metadata.DataObjectAttribute;
  import org.kuali.rice.krad.data.provider.annotation.UifDisplayHint;
  import org.kuali.rice.krad.keyvalues.KeyValuesFinder;
  
  import com.google.common.annotations.Beta;
  
  /**
   * Base implementation class for attribute metadata for data object classes.
   *
   * <p>
   * This implementation supports "chaining" for most attributes. That is, if the value for a property is defined locally,
   * it will me used. If unset (null) it will, if there is an {@link #embeddedAttribute}, request it from that
   * DataObjectAttribute. (This could be a recursive operation if multiple metadata providers are chained.)
   * </p>
   * <p>
   * If the value is unset and there is no embedded attribute, most methods will return a non-null default value.
   * </p>
   *
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class DataObjectAttributeImpl extends MetadataCommonBase implements DataObjectAttributeInternal {
  	private static final long serialVersionUID = -5241499559388935579L;
  	private static final org.apache.log4j.Logger LOG = org.apache.log4j.Logger.getLogger(DataObjectAttributeImpl.class);
  
  	protected DataObjectAttribute embeddedAttribute;
  
  	protected Class<?> owningType;
  
  	// These are temporary placeholders for the source property from which a property was inherited when
  	// it "lives" on a related object. E.g., accountType.codeAndDescription
  	// After all metadata has been imported, this information will be used to "embed" the parent
  	// DataObjectAttribute so that properties (E.g., label) are inherited from there
  	protected Class<?> inheritedFromType;
  	protected String inheritedFromAttributeName;
  	protected String inheritedFromParentAttributeName;
  	protected String displayAttributeName;
  	protected Boolean caseInsensitive;
  	protected Boolean forceUppercase;
  	protected Boolean required;
  	protected Boolean persisted;
  	protected Boolean sensitive;
  	protected Long maxLength;
  	protected Long minLength;
  	protected String validCharactersConstraintBeanName;
  
  	protected PropertyEditor propertyEditor;
  	protected KeyValuesFinder validValues;
  	protected DataType dataType;
  	protected Class<?> type;
  	
  	protected Set<UifDisplayHint> displayHints;
  
      /**
       * {@inheritDoc}
       */
  	@Override
  	public String getDisplayAttributeName() {
  		if (displayAttributeName != null) {
  			return displayAttributeName;
  		}
  
  		if (embeddedAttribute != null) {
  			return embeddedAttribute.getDisplayAttributeName();
  		}
  
  		return getName();
  	}
  
      /**
      * Sets the attribute display name.
      *
      * @param displayAttributeName the attribute name.
      */
  	public void setDisplayAttributeName(String displayAttributeName) {
  		if (StringUtils.isBlank(displayAttributeName)) {
  			displayAttributeName = null;
 		}
 
 		this.displayAttributeName = displayAttributeName;
 	}
 
     /**
      * {@inheritDoc}
      */
 	@Override
 	public boolean isCaseInsensitive() {
 		if (caseInsensitive != null) {
 			return caseInsensitive;
 		}
 
 		if (embeddedAttribute != null) {
 			return embeddedAttribute.isCaseInsensitive();
 		}
 
 		return false;
 	}
 
     /**
     * Sets value that determines whether attribute is case insensitive.
     *
     * @param caseInsensitive whether attribute is case insensitive.
     */
 	public void setCaseInsensitive(boolean caseInsensitive) {
 		this.caseInsensitive = caseInsensitive;
 	}
 
     /**
      * {@inheritDoc}
      */
 	@Override
 	public boolean isForceUppercase() {
 		if (forceUppercase != null) {
 			return forceUppercase;
 		}
 
 		if (embeddedAttribute != null) {
 			return embeddedAttribute.isForceUppercase();
 		}
 
 		return false;
 	}
 
 
     /**
     * Determines if attribute should be forced to upper case.
     *
     * @param forceUppercase whether attribute should be forced to upper.
     */
 	public void setForceUppercase(boolean forceUppercase) {
 		this.forceUppercase = forceUppercase;
 	}
 
     /**
      * {@inheritDoc}
      */
 	@Override
 	public PropertyEditor getPropertyEditor() {
 		if (propertyEditor != null) {
 			return propertyEditor;
 		}
 
 		if (embeddedAttribute != null) {
 			return embeddedAttribute.getPropertyEditor();
 		}
 
 		return null;
 	}
 
     /**
      * Sets the property editor used when loading data.
      *
      * @param propertyEditor determines formats when loading data.
      */
 	public void setPropertyEditor(PropertyEditor propertyEditor) {
 		this.propertyEditor = propertyEditor;
 	}
 
     /**
      * {@inheritDoc}
      */
 	@Override
 	public KeyValuesFinder getValidValues() {
 		if (validValues != null) {
 			return validValues;
 		}
 
 		if (embeddedAttribute != null) {
 			return embeddedAttribute.getValidValues();
 		}
 
 		return null;
 	}
 
     /**
     * Sets keyValueFinder used for dropdown.
     *
     * @param validValues dropdown keyValueFinder.
     */
 	public void setValidValues(KeyValuesFinder validValues) {
 		this.validValues = validValues;
 	}
 
     /**
      * {@inheritDoc}
      */
 	@Override
 	public DataType getDataType() {
 		if (dataType != null) {
 			return dataType;
 		}
 
 		if (embeddedAttribute != null) {
 			return embeddedAttribute.getDataType();
 		}
 
 		return DataType.STRING;
 	}
 
     /**
     * Sets KRAD data type.
     *
     * @param dataType KRAD derived data type.
     */
 	public void setDataType(DataType dataType) {
 		this.dataType = dataType;
 	}
 
     /**
      * {@inheritDoc}
      */
 	@Override
 	public String toString() {
 		StringBuilder builder = new StringBuilder();
 		builder.append("DataObjectAttribute [");
 		builder.append("name=").append(name);
 		if (label != null) {
 			builder.append(", ").append("label=").append(label);
 		}
 		if (backingObjectName != null) {
 			builder.append(", ").append("backingObjectName=").append(backingObjectName);
 		}
 		if (dataType != null) {
 			builder.append(", ").append("dataType=").append(dataType);
 		}
 		if (type != null) {
 			builder.append(", ").append("type=").append(type.getName());
 		}
 		if (caseInsensitive != null) {
 			builder.append(", ").append("caseInsensitive=").append(caseInsensitive);
 		}
 		if (propertyEditor != null) {
 			builder.append(", ").append("propertyEditor=").append(propertyEditor);
 		}
 		if (sensitive != null && sensitive) {
 			builder.append(", ").append("sensitive=").append(sensitive);
 		}
 		if (validValues != null) {
 			builder.append(", ").append("validValues=").append(validValues);
 		}
 		if (inheritedFromType != null) {
 			builder.append(", ").append("inheritedFromType=").append(inheritedFromType);
 		}
 		if (inheritedFromAttributeName != null) {
 			builder.append(", ").append("inheritedFromAttributeName=").append(inheritedFromAttributeName);
 		}
 		builder.append(", ").append("mergeAction=").append(mergeAction);
 		builder.append("]");
 		return builder.toString();
 	}
 
     /**
      * {@inheritDoc}
      */
 	@Override
 	public Long getMaxLength() {
 		if (maxLength != null) {
 			return maxLength;
 		}
 
 		if (embeddedAttribute != null) {
 			return embeddedAttribute.getMaxLength();
 		}
 
 		return null;
 	}
 
     /**
     * Sets max length of attribute.
     *
     * @param maxLength attribute max length.
     */
 	public void setMaxLength(Long maxLength) {
 		this.maxLength = maxLength;
 	}
 
     /**
      * {@inheritDoc}
      */
 	@Override
 	public DataObjectAttribute getEmbeddedAttribute() {
 		return embeddedAttribute;
 	}
 
     /**
      * {@inheritDoc}
      */
 	@Override
 	public void setEmbeddedAttribute(DataObjectAttribute embeddedAttribute) {
 		// protect against embedding itself
 		if (embeddedAttribute == this) {
 			LOG.warn(
 					"ERROR!!!!  Attempt to embed a DataObjectAttribute into itself.  You must really want a stack overflow!  Trace: ",
 					new Throwable("Throw-away Throwable for tracing purposes."));
 			return;
 		}
 
 		this.embeddedAttribute = embeddedAttribute;
 		setEmbeddedCommonMetadata(embeddedAttribute);
 	}
 
     /**
      * {@inheritDoc}
      */
 	@Override
 	public boolean isRequired() {
 		if (required != null) {
 			return required;
 		}
 
 		if (embeddedAttribute != null) {
 			return embeddedAttribute.isRequired();
 		}
 
 		return false;
 	}
 
     /**
     * Set whether attribute is required.
     *
     * @param required attribute required flag.
     */
 	public void setRequired(boolean required) {
 		this.required = required;
 	}
 
     /**
      * {@inheritDoc}
      */
 	@Override
     @Beta
 	public String getValidCharactersConstraintBeanName() {
 		if (validCharactersConstraintBeanName != null) {
 			return validCharactersConstraintBeanName;
 		}
 
 		if (embeddedAttribute != null) {
 			return embeddedAttribute.getValidCharactersConstraintBeanName();
 		}
 
 		return validCharactersConstraintBeanName;
 	}
 
     /**
      * BETA: Sets valid character constraint bean name.
      *
      * @param validCharactersConstraintBeanName character constraint bean name.
      */
     @Beta
 	public void setValidCharactersConstraintBeanName(String validCharactersConstraintBeanName) {
 		this.validCharactersConstraintBeanName = validCharactersConstraintBeanName;
 	}
 
     /**
      * {@inheritDoc}
      */
 	@Override
 	public Class<?> getOwningType() {
 		if (owningType != null) {
 			return owningType;
 		}
 
 		if (embeddedAttribute != null) {
 			return embeddedAttribute.getOwningType();
 		}
 
 		return null;
 	}
 
     /**
     * Sets the data object type to which this attribute belongs.
     *
     * @param owningType data object type to which this attribute belongs.
     */
 	public void setOwningType(Class<?> owningType) {
 		this.owningType = owningType;
 	}
 
     /**
      * {@inheritDoc}
      */
 	@Override
 	public boolean isPersisted() {
 		if (persisted != null) {
 			return persisted;
 		}
 
 		if (embeddedAttribute != null) {
 			return embeddedAttribute.isPersisted();
 		}
 
 		return true;
 	}
 
     /**
     * Sets flag whether object is persisted.
     *
     * @param persisted flag whether object is persisted.
     */
 	public void setPersisted(boolean persisted) {
 		this.persisted = persisted;
 	}
 
     /**
     * Determines type of class.
     *
     */
 	public Class<?> getType() {
 		if (type != null) {
             return type;
         }
 
 		return String.class;
 	}
 
     /**
     * Sets unknown class in order to determine type.
     *
     * @param javaType unknown class.
     */
 	public void setType(Class<?> javaType) {
 		this.type = javaType;
 	}
 
     /**
      * {@inheritDoc}
      */
 	@Override
 	public Class<?> getInheritedFromType() {
 		if (inheritedFromType != null) {
 			return inheritedFromType;
 		}
 
 		if (embeddedAttribute != null) {
 			return embeddedAttribute.getInheritedFromType();
 		}
 
 		return null;
 	}
 
     /**
     * Sets unknown class to determine if inherited.
     *
     * @param inheritedFromType unknown class.
     */
 	public void setInheritedFromType(Class<?> inheritedFromType) {
 		this.inheritedFromType = inheritedFromType;
 	}
 
     /**
      * {@inheritDoc}
      */
 	@Override
 	public String getInheritedFromAttributeName() {
 		if (inheritedFromAttributeName != null) {
 			return inheritedFromAttributeName;
 		}
 
 		if (embeddedAttribute != null) {
 			return embeddedAttribute.getInheritedFromAttributeName();
 		}
 
 		return null;
 	}
 
     /**
     * Sets data object name to determine if inherited.
     *
     * @param inheritedFromAttributeName name of attribute.
     */
 	public void setInheritedFromAttributeName(String inheritedFromAttributeName) {
 		this.inheritedFromAttributeName = inheritedFromAttributeName;
 	}
 
     /**
      * {@inheritDoc}
      */
 	@Override
 	public String getInheritedFromParentAttributeName() {
 		if (inheritedFromParentAttributeName != null) {
 			return inheritedFromParentAttributeName;
 		}
 
 		if (embeddedAttribute != null) {
 			return embeddedAttribute.getInheritedFromParentAttributeName();
 		}
 
 		return null;
 	}
 
     /**
     * Sets parent data object name to determine if inherited.
     *
     * @param inheritedFromParentAttributeName name of attribute.
     */
 	public void setInheritedFromParentAttributeName(String inheritedFromParentAttributeName) {
 		this.inheritedFromParentAttributeName = inheritedFromParentAttributeName;
 	}
 
     /**
      * {@inheritDoc}
      */
 	@Override
 	public boolean isInherited() {
 		return getInheritedFromAttributeName() != null;
 	}
 
     /**
      * {@inheritDoc}
      */
 	@Override
 	public DataObjectAttribute getOriginalDataObjectAttribute() {
 		if (embeddedAttribute == null) {
 			return this;
 		}
 		return embeddedAttribute.getOriginalDataObjectAttribute();
 	}
 
     /**
      * {@inheritDoc}
      */
 	@Override
 	public Long getMinLength() {
 		if (minLength != null) {
 			return minLength;
 		}
 		if (embeddedAttribute != null) {
 			return embeddedAttribute.getMinLength();
 		}
 		return null;
 	}
 
     /**
     * Sets minimum length of attribute.
     *
     * @param minLength minimum length value.
     */
 	public void setMinLength(Long minLength) {
 		this.minLength = minLength;
 	}
 
     /**
      * {@inheritDoc}
      */
 	@Override
 	public boolean isSensitive() {
 		if (sensitive != null) {
 			return sensitive;
 		}
 
 		if (embeddedAttribute != null) {
 			return embeddedAttribute.isSensitive();
 		}
 
 		return false;
 	}
 
     /**
     * Sets whether sensitive.
     *
     * @param sensitive whether attribute is sensitive.
     */
 	public void setSensitive(boolean sensitive) {
 		this.sensitive = sensitive;
 	}
 
     /**
      * {@inheritDoc}
      */
     @Override
     @Beta
 	public Set<UifDisplayHint> getDisplayHints() {
 		if (displayHints != null) {
 			return displayHints;
 		}
 
 		if (embeddedAttribute != null) {
 			return embeddedAttribute.getDisplayHints();
 		}
 
 		return Collections.emptySet();
 	}
 
     /**
     * BETA: Sets UIF display hints.
     *
     * @param displayHints UIF display hints.
     */
     @Beta
 	public void setDisplayHints(Set<UifDisplayHint> displayHints) {
 		this.displayHints = displayHints;
 	}
 }