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https://github.com/Alfresco/alfresco-community-repo.git
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31c250682b
git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@5081 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
118 lines
3.8 KiB
Java
118 lines
3.8 KiB
Java
/*
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* Copyright (C) 2005 Alfresco, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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package org.alfresco.repo.dictionary.constraint;
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import java.util.Collection;
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import org.alfresco.service.cmr.dictionary.Constraint;
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import org.alfresco.service.cmr.dictionary.ConstraintException;
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import org.alfresco.service.cmr.dictionary.DictionaryException;
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import org.alfresco.service.cmr.repository.datatype.DefaultTypeConverter;
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/**
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* Base services for constraints.
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*
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* @author Derek Hulley
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*/
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public abstract class AbstractConstraint implements Constraint
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{
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public static final String ERR_PROP_NOT_SET = "d_dictionary.constraint.err.property_not_set";
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public static final String ERR_EVALUATE_EXCEPTION = "d_dictionary.constraint.err.evaluate_exception";
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/**
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* Check that the given value is not <tt>null</tt>.
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*
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* @param name the name of the property
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* @param value the value to check for <tt>null</tt>
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*
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* @throws DictionaryException if the the property is null
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*/
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protected void checkPropertyNotNull(String name, Object value)
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{
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if (value == null)
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{
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throw new DictionaryException(AbstractConstraint.ERR_PROP_NOT_SET, value);
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}
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}
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/**
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* @see #evaluateSingleValue(Object)
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* @see #evaluateCollection(Collection)
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*/
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@SuppressWarnings("unchecked")
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public final void evaluate(Object value)
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{
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if (value == null)
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{
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// null values are never evaluated
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return;
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}
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try
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{
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// ensure that we can handle collections
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if (DefaultTypeConverter.INSTANCE.isMultiValued(value))
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{
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Collection collection = DefaultTypeConverter.INSTANCE.getCollection(Object.class, value);
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evaluateCollection(collection);
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}
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else
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{
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evaluateSingleValue(value);
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}
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}
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catch (ConstraintException e)
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{
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// this can go
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throw e;
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}
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catch (Throwable e)
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{
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throw new DictionaryException(AbstractConstraint.ERR_EVALUATE_EXCEPTION, this, e.getMessage());
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}
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}
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/**
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* Only override if there is some specific evaluation that needs to be performed on the
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* collection as a whole.
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*
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* @param collection the collection of values to evaluate
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*
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* @see #evaluateSingleValue(Object)
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*/
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protected void evaluateCollection(Collection<Object> collection)
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{
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for (Object value : collection)
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{
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if (value == null)
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{
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// contract states that it will always pass
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continue;
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}
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evaluateSingleValue(value);
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}
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}
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/**
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* Support for evaluation of properties. The value passed in will never be a
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* <tt>Collection</tt> and will never be <tt>null</tt>.
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*
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* @throws ConstraintException throw this when the evaluation fails
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*/
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protected abstract void evaluateSingleValue(Object value);
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}
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