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ahuber pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/isis.git
commit f485b1b06f0b99405b3712ea8bd5463d071e1e9f
Author: Andi Huber <ahu...@apache.org>
AuthorDate: Fri May 4 15:43:23 2018 +0200
ISIS-1943: extending the tree API: introduces TreePath
Task-Url: https://issues.apache.org/jira/browse/ISIS-1943
---
.../org/apache/isis/applib/tree/LazyTreeNode.java | 35 +++++++++++++++
.../java/org/apache/isis/applib/tree/TreeNode.java | 4 ++
.../java/org/apache/isis/applib/tree/TreePath.java | 50 ++++++++++++++++++++++
.../apache/isis/applib/tree/TreePath_Default.java | 47 ++++++++++++++++++++
.../components/tree/IsisToWicketTreeAdapter.java | 3 +-
5 files changed, 138 insertions(+), 1 deletion(-)
diff --git
a/core/applib/src/main/java/org/apache/isis/applib/tree/LazyTreeNode.java
b/core/applib/src/main/java/org/apache/isis/applib/tree/LazyTreeNode.java
index 1d75d33..98ce49f 100644
--- a/core/applib/src/main/java/org/apache/isis/applib/tree/LazyTreeNode.java
+++ b/core/applib/src/main/java/org/apache/isis/applib/tree/LazyTreeNode.java
@@ -19,10 +19,12 @@
package org.apache.isis.applib.tree;
import java.util.Objects;
+import java.util.concurrent.atomic.LongAdder;
import java.util.stream.Stream;
import org.apache.isis.applib.annotation.Value;
import org.apache.isis.applib.internal.base._Lazy;
+import org.apache.isis.applib.internal.exceptions._Exceptions;
@Value(semanticsProviderName="org.apache.isis.core.metamodel.facets.value.treenode.TreeNodeValueSemanticsProvider")
public class LazyTreeNode<T> implements TreeNode<T> {
@@ -30,6 +32,7 @@ public class LazyTreeNode<T> implements TreeNode<T> {
private final T value;
private final Class<? extends TreeAdapter<T>> treeAdapterClass;
private final _Lazy<TreeAdapter<T>> treeAdapter =
_Lazy.of(this::newTreeAdapter);
+ private final _Lazy<TreePath> treePath =
_Lazy.of(this::resolveTreePath);
public static <T> TreeNode<T> of(T value, Class<? extends
TreeAdapter<T>> treeAdapterClass) {
return new LazyTreeNode<T>(value, treeAdapterClass);
@@ -73,6 +76,11 @@ public class LazyTreeNode<T> implements TreeNode<T> {
return treeAdapterClass;
}
+ @Override
+ public TreePath getPositionAsPath() {
+ return treePath.get();
+ }
+
// -- HELPER
private TreeAdapter<T> newTreeAdapter() {
@@ -92,5 +100,32 @@ public class LazyTreeNode<T> implements TreeNode<T> {
return of(value, getTreeAdapterClass());
}
+ private TreePath resolveTreePath() {
+ final TreeNode<T> parent = getParentIfAny();
+ if(parent==null) {
+ return TreePath.root();
+ }
+ return
parent.getPositionAsPath().append(indexWithinSiblings(parent));
+ }
+
+ /*
+ * @return zero based index
+ */
+ private int indexWithinSiblings(TreeNode<T> parent) {
+ final LongAdder indexOneBased = new LongAdder();
+
+ boolean found = parent.streamChildren()
+ .peek(__->indexOneBased.increment())
+ .anyMatch(sibling->this.equals(sibling))
+ ;
+
+ if(!found) {
+ throw _Exceptions.unexpectedCodeReach();
+ }
+
+ return indexOneBased.intValue()-1;
+ }
+
+
}
diff --git
a/core/applib/src/main/java/org/apache/isis/applib/tree/TreeNode.java
b/core/applib/src/main/java/org/apache/isis/applib/tree/TreeNode.java
index e387c0c..7ebb3ee 100644
--- a/core/applib/src/main/java/org/apache/isis/applib/tree/TreeNode.java
+++ b/core/applib/src/main/java/org/apache/isis/applib/tree/TreeNode.java
@@ -51,6 +51,10 @@ public interface TreeNode<T> {
public default boolean isLeaf() {
return getChildCount() == 0;
}
+
+ // -- PATH INFO
+
+ public TreePath getPositionAsPath();
// -- CONSTRUCTION
diff --git
a/core/applib/src/main/java/org/apache/isis/applib/tree/TreePath.java
b/core/applib/src/main/java/org/apache/isis/applib/tree/TreePath.java
new file mode 100644
index 0000000..0e8c349
--- /dev/null
+++ b/core/applib/src/main/java/org/apache/isis/applib/tree/TreePath.java
@@ -0,0 +1,50 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache 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.apache.org/licenses/LICENSE-2.0
+ *
+ * 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.apache.isis.applib.tree;
+
+import java.io.Serializable;
+
+/**
+ * Provides an unambiguous way to address nodes by position within a
tree-structure. Examples:
+ * <ul>
+ * <li>/0 ... the tree root</li>
+ * <li>/0/1 ... the second child of root</li>
+ * <li>/0/0/0 ... the first child of first child of root</li>
+ * </ul>
+ * @since 2.0.0
+ */
+public interface TreePath extends Serializable {
+
+ /**
+ * @param indexWithinSiblings
+ * @return a new TreePath instance composed of this with one canonical
path entry added
+ */
+ public TreePath append(int indexWithinSiblings);
+
+ // -- CONSTRUCTION
+
+ public static TreePath of(final int ... canonicalPath) {
+ return new TreePath_Default(canonicalPath);
+ }
+
+ public static TreePath root() {
+ return of(0);
+ }
+
+}
diff --git
a/core/applib/src/main/java/org/apache/isis/applib/tree/TreePath_Default.java
b/core/applib/src/main/java/org/apache/isis/applib/tree/TreePath_Default.java
new file mode 100644
index 0000000..ce30341
--- /dev/null
+++
b/core/applib/src/main/java/org/apache/isis/applib/tree/TreePath_Default.java
@@ -0,0 +1,47 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache 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.apache.org/licenses/LICENSE-2.0
+ *
+ * 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.apache.isis.applib.tree;
+
+import java.util.Objects;
+
+/**
+ * Package private mixin for TreePath.
+ */
+class TreePath_Default implements TreePath {
+
+ private static final long serialVersionUID = 530511373409525896L;
+ private final int[] canonicalPath;
+
+ TreePath_Default(int[] canonicalPath) {
+ Objects.requireNonNull(canonicalPath, "canonicalPath is
required");
+ if(canonicalPath.length<1) {
+ throw new IllegalArgumentException("canonicalPath must
not be empty");
+ }
+ this.canonicalPath = canonicalPath;
+ }
+
+ @Override
+ public TreePath append(int indexWithinSiblings) {
+ int[] newCanonicalPath = new int[canonicalPath.length+1];
+ System.arraycopy(canonicalPath, 0, newCanonicalPath, 0,
canonicalPath.length);
+ newCanonicalPath[canonicalPath.length] = indexWithinSiblings;
+ return new TreePath_Default(newCanonicalPath);
+ }
+
+}
diff --git
a/core/viewer-wicket-ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/tree/IsisToWicketTreeAdapter.java
b/core/viewer-wicket-ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/tree/IsisToWicketTreeAdapter.java
index 766fd68..102a12a 100644
---
a/core/viewer-wicket-ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/tree/IsisToWicketTreeAdapter.java
+++
b/core/viewer-wicket-ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/tree/IsisToWicketTreeAdapter.java
@@ -275,7 +275,8 @@ class IsisToWicketTreeAdapter {
}
/*
- * Important! Models must be identifiable by their contained
object.
+ * Important! Models must be identifiable by their contained
object. Also IDs must be
+ * unique within a tree structure.
*/
@Override
public boolean equals(Object obj) {
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