1 files changed, 120 insertions, 0 deletions
diff --git a/src/uk/org/ury/common/show/ShowChannel.java b/src/uk/org/ury/common/show/ShowChannel.java
new file mode 100644
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+++ b/src/uk/org/ury/common/show/ShowChannel.java
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+/*
+ * ShowChannel.java
+ * ------------------
+ * 
+ * Part of the URY Presentation Suite
+ * 
+ * V0.00  2011/03/21
+ * 
+ * (C) 2011 URY Computing
+ */
+
+package uk.org.ury.common.show;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.swing.AbstractListModel;
+
+import uk.org.ury.common.show.item.ShowItem;
+
+/**
+ * A channel of ShowItems in a show.
+ * 
+ * @author Matt Windsor
+ */
+public class ShowChannel extends AbstractListModel {
+    /**
+     * 
+     */
+    private static final long serialVersionUID = -4651104185166068150L;
+
+    /* Items enqueued in channel. */
+    private List<ShowItem> items;
+
+    /**
+     * Constructs a new, empty channel.
+     */
+    public ShowChannel() {
+	items = new ArrayList<ShowItem>();
+    }
+
+    /**
+     * Adds a new item to the channel.
+     * 
+     * @param index
+     *            The position at which to add the item.
+     * 
+     * @param item
+     *            The new item to add.
+     * 
+     * @throws IllegalArgumentException
+     *             if the item is null, the index is negative or the index is
+     *             out of bounds.
+     */
+    public void add(int index, ShowItem item) {
+	if (item == null)
+	    throw new IllegalArgumentException("Item is null.");
+
+	if (index < 0 || index >= items.size())
+	    throw new IllegalArgumentException("Index " + index
+		    + " out of bounds.");
+
+	items.add(index, item);
+	fireIntervalAdded(this, index, index);
+    }
+
+    /**
+     * Adds a new item to the end of the channel.
+     * 
+     * @param item
+     *            The new item to add.
+     */
+    public void add(ShowItem item) {
+	if (item == null)
+	    throw new IllegalArgumentException("Item is null.");
+
+	items.add(item);
+	fireIntervalAdded(this, items.size() - 1, items.size() - 1);
+    }
+
+    /**
+     * Retrieves an item from the channel.
+     * 
+     * @param index
+     *            The index of the item to retrieve from the channel.
+     * 
+     * @return the item at the given index in the list.
+     * 
+     * @throws IllegalArgumentException
+     *             if the index is negative or overflowing.
+     */
+    public ShowItem get(int index) {
+	if (index < 0 || index >= items.size())
+	    throw new IllegalArgumentException("Index " + index
+		    + " out of bounds.");
+
+	return items.get(index);
+    }
+
+    /**
+     * List model retrieval wrapper for get.
+     * 
+     * @param index
+     *            The index of the item to retrieve from the channel.
+     * 
+     * @return the item at the given index in the list.
+     */
+    @Override
+    public Object getElementAt(int index) {
+	return get(index);
+    }
+
+    /**
+     * @return the size of the list.
+     */
+    @Override
+    public int getSize() {
+	return items.size();
+    }
+}