| /******************************************************************************* |
| * Copyright (c) 2007 Oracle Corporation. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Oracle - initial API and implementation |
| * |
| ********************************************************************************/ |
| package org.eclipse.jst.jsf.common.metadata.query.internal; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Stack; |
| |
| import org.eclipse.jst.jsf.common.metadata.Entity; |
| import org.eclipse.jst.jsf.common.metadata.EntityGroup; |
| import org.eclipse.jst.jsf.common.metadata.query.AbstractEntityQueryVisitor; |
| import org.eclipse.jst.jsf.common.metadata.query.IResultSet; |
| |
| |
| /** |
| * A simple metadata query visitor implementing {@link org.eclipse.jst.jsf.common.metadata.query.IEntityQueryVisitor} and {@link org.eclipse.jst.jsf.common.metadata.query.ITraitQueryVisitor}. |
| * - simple find entity and traits by id only |
| * - Does not allow for wild card searchs |
| * |
| * TODO - fix for case-sensitivity https://bugs.eclipse.org/bugs/show_bug.cgi?id=212794 |
| */ |
| public class SimpleEntityQueryVisitorImpl extends AbstractEntityQueryVisitor { |
| private HierarchicalSearchControl control; |
| private boolean _stop; |
| |
| private EntityQueryComparator entityComparator; |
| private List/*<Entity>*/ _entityResults; |
| |
| /** |
| * Constructor that also creates a default SearchControl |
| */ |
| public SimpleEntityQueryVisitorImpl() { |
| super(); |
| control = new HierarchicalSearchControl(); |
| } |
| |
| /** |
| * Constructor |
| * @param control |
| */ |
| public SimpleEntityQueryVisitorImpl(HierarchicalSearchControl control) { |
| super(); |
| this.control = control; |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jst.jsf.common.metadata.query.IEntityQueryVisitor#findEntities(org.eclipse.jst.jsf.common.metadata.Entity, java.lang.String) |
| */ |
| public IResultSet/*<Entity>*/ findEntities(Entity initialEntityContext, |
| String entityKey) { |
| |
| resetQuery(); |
| |
| if (initialEntityContext != null){ |
| entityComparator = new EntityQueryComparator(entityKey); |
| initialEntityContext.accept(this); |
| } |
| |
| return new SimpleResultSet(getInternalEntityResults()); |
| } |
| |
| private void resetQuery() { |
| _stop = false; |
| _entityResults = null; |
| } |
| |
| private List/*<Entity>*/ getInternalEntityResults(){ |
| if (_entityResults == null){ |
| _entityResults = new ArrayList/*<Entity>*/(); |
| } |
| return _entityResults; |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jst.jsf.common.metadata.query.IEntityVisitor#visit(org.eclipse.jst.jsf.common.metadata.Entity) |
| */ |
| public void visit(Entity key) { |
| switch (entityComparator.compareTo(key)){ |
| case 0: |
| getInternalEntityResults().add(key); |
| break; |
| default: |
| break; |
| |
| } |
| checkShouldStopVisitingEntities(); |
| } |
| /* (non-Javadoc) |
| * @see org.eclipse.jst.jsf.common.metadata.query.IEntityVisitor#visitCompleted(Entity entity) |
| */ |
| public void visitCompleted(Entity entity) { |
| entityComparator.popContext(); |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jst.jsf.common.metadata.query.IMetaDataVisitor#stopVisiting() |
| */ |
| public boolean stopVisiting() { |
| return _stop; |
| } |
| |
| private void checkShouldStopVisitingEntities(){ |
| //implement how to set stop to signal to the entity accept() to skip visiting |
| if (control.getCountLimit()== getInternalEntityResults().size() && control.getCountLimit() != SearchControl.COUNT_LIMIT_NONE ) |
| _stop = true; |
| } |
| |
| /** |
| * Simple comparator that compares that an entity's id for with another. |
| * Case-insensitive compare |
| * |
| */ |
| private class EntityQueryComparator implements Comparable/*<Entity>*/{ |
| |
| private String entityKey; |
| private EntityStack stack; |
| |
| /** |
| * Constructor |
| * @param entityKey |
| */ |
| public EntityQueryComparator(String entityKey){ |
| this.entityKey = entityKey.toUpperCase(); |
| stack = new EntityStack(); |
| } |
| |
| public int compareTo(Object entity) { |
| stack.push(entity); |
| return entityKey.compareTo(getRelativeId().toUpperCase()); |
| } |
| |
| /** |
| * Pop stack |
| */ |
| public void popContext(){ |
| stack.pop(); |
| } |
| |
| private String getRelativeId(){ |
| int size = stack.size(); |
| int i = 1; |
| StringBuffer buf = new StringBuffer(); |
| while(i < size){ |
| Entity e = (Entity)stack.elementAt(i); |
| if (!(e instanceof EntityGroup)){ |
| if (buf.length()>0) |
| buf.append("/"); |
| buf.append(e.getId()); |
| } |
| i++; |
| } |
| return buf.toString(); |
| } |
| } |
| |
| /** |
| * Stack used for determining relative key of an entity from the initial context. |
| */ |
| private class EntityStack extends Stack/*<Entity>*/ { |
| /** |
| * |
| */ |
| private static final long serialVersionUID = -6010267544968175003L; |
| |
| /** |
| * Constructor |
| */ |
| public EntityStack(){ |
| super(); |
| } |
| } |
| |
| } |