bundles/org.simantics.databoard/src/org/simantics/databoard/binding/impl/PriorityQueueBinding.java

   1 /*******************************************************************************
   2  *  Copyright (c) 2010 Association for Decentralized Information Management in
   3  *  Industry THTH ry.
   4  *  All rights reserved. This program and the accompanying materials
   5  *  are made available under the terms of the Eclipse Public License v1.0
   6  *  which accompanies this distribution, and is available at
   7  *  http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  *  Contributors:
  10  *      VTT Technical Research Centre of Finland - initial API and implementation
  11  *******************************************************************************/
  12 package org.simantics.databoard.binding.impl;
  13
  14 import java.util.Collection;
  15 import java.util.Iterator;
  16 import java.util.PriorityQueue;
  17
  18 import org.simantics.databoard.binding.ArrayBinding;
  19 import org.simantics.databoard.binding.Binding;
  20 import org.simantics.databoard.binding.error.BindingException;
  21 import org.simantics.databoard.type.ArrayType;
  22
  23 /**
  24  * PriorityQueueBindings binds ArrayType to java.util.PriorityQueue
  25  *
  26  * @author Toni Kalajainen <toni.kalajainen@vtt.fi>
  27  */
  28 public class PriorityQueueBinding extends ArrayBinding {
  29
  30         public PriorityQueueBinding(Binding componentBinding) {
  31                 this(new ArrayType(componentBinding.type()), componentBinding);
  32         }
  33
  34         public PriorityQueueBinding(ArrayType type, Binding componentBinding) {
  35                 super(type, componentBinding);
  36                 if (type==null) throw new IllegalArgumentException("null arg");
  37                 this.type = type;
  38         }
  39
  40         @Override
  41         public Object create() {
  42                 return new PriorityQueue<Object>(11, componentBinding);
  43         }
  44
  45         @Override
  46         public Object create(Collection<Object> collection ) throws BindingException {
  47                 PriorityQueue<Object> result = new PriorityQueue<Object>( collection.size(), componentBinding );
  48                 result.addAll( collection );
  49                 return result;
  50         }
  51
  52         /**
  53          * Create new ArrayList
  54          */
  55         @Override
  56         public Object create(int length, Iterator<Object> values) {
  57                 PriorityQueue<Object> result = new PriorityQueue<Object>( length, componentBinding );
  58                 while (values.hasNext())
  59                         result.add(values.next());
  60                 return result;
  61         }
  62
  63         public Object create(Object[] values) {
  64                 PriorityQueue<Object> result = new PriorityQueue<Object>(values.length, componentBinding );
  65                 for (int i=0; i<values.length; i++)
  66                         result.add(values[i]);
  67                 return result;
  68         }
  69
  70
  71         @SuppressWarnings("unchecked")
  72         @Override
  73         public Object get(Object queue, int index) throws BindingException {
  74                 if (!isInstance(queue)) throw new BindingException("Unexpected class "+queue.getClass().getSimpleName()+", PriorityQueue expected");
  75                 PriorityQueue<Object> q = (PriorityQueue<Object>) queue;
  76                 if ( index<0 || index>=q.size() ) throw new BindingException("Index out of bounds");
  77                 Iterator<Object> it = q.iterator();
  78                 Object result = null;
  79                 for (int i=0; i<=index; i++)
  80                 {
  81                         result = it.next();
  82                 }
  83                 return result;
  84         }
  85
  86         @SuppressWarnings("unchecked")
  87     @Override
  88         public void getAll(Object queue, Object[] result) throws BindingException {
  89                 PriorityQueue<Object> q = (PriorityQueue<Object>) queue;
  90                 int i=0;
  91                 for (Iterator<Object> it = q.iterator(); it.hasNext();)
  92                         result[ i++ ] = it.next();
  93         }
  94
  95     @Override
  96         public void set(Object array, int index, Object value) throws BindingException {
  97                 remove(array, index, 1);
  98                 add(array, index, value);
  99         }
 100
 101         @SuppressWarnings("unchecked")
 102     @Override
 103         public void add(Object queue, int index, Object element) throws BindingException, IndexOutOfBoundsException {
 104                 PriorityQueue<Object> q = (PriorityQueue<Object>) queue;
 105                 q.add( element );
 106         }
 107
 108         @SuppressWarnings("unchecked")
 109         @Override
 110         public void remove(Object queue, int index, int count) throws BindingException {
 111                 PriorityQueue<Object> q = (PriorityQueue<Object>) queue;
 112                 Iterator<Object> it = q.iterator();
 113                 if (index<0 || index>=q.size()) throw new BindingException("Index out of bounds");
 114                 for (int i=0; i<=index; i++) it.next();
 115                 it.remove();
 116         }
 117
 118         @SuppressWarnings("unchecked")
 119         @Override
 120         public int size(Object queue) throws BindingException {
 121                 if (!isInstance(queue)) throw new BindingException("Unexpected class "+queue.getClass().getSimpleName()+", PriorityQueue expected");
 122                 PriorityQueue<Object> q = (PriorityQueue<Object>) queue;
 123                 return q.size();
 124         }
 125
 126         @Override
 127         public boolean isInstance(Object obj) {
 128                 return obj instanceof PriorityQueue<?>;
 129         }
 130
 131         @Override
 132         public void setSize(Object queue, int newSize) throws BindingException {
 133                 @SuppressWarnings("unchecked")
 134                 PriorityQueue<Object> q = (PriorityQueue<Object>) queue;
 135                 int c = q.size() - newSize;
 136                 for (int i=0; i<c; i++) q.remove();
 137         }
 138
 139         @Override
 140         public boolean isImmutable() {
 141                 return false;
 142         }
 143
 144         @Override
 145         public boolean isResizable() {
 146                 return true;
 147         }
 148
 149 }
 150