1 files changed, 100 insertions, 0 deletions
diff --git a/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/common/layout/relative/Match.java b/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/common/layout/relative/Match.java
new file mode 100644
index 000000000..6f3f0d0f7
--- /dev/null
+++ b/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/common/layout/relative/Match.java
@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Eclipse Public License, Version 1.0 (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.eclipse.org/org/documents/epl-v10.php
+ *
+ * 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 com.android.ide.common.layout.relative;
+
+import static com.android.SdkConstants.ATTR_ID;
+import static com.android.SdkConstants.VALUE_TRUE;
+
+
+import com.android.SdkConstants;
+import static com.android.SdkConstants.ANDROID_URI;
+import com.android.ide.common.api.Segment;
+
+/** A match is a potential pairing of two segments with a given {@link ConstraintType}. */
+class Match {
+    /** the edge of the dragged node that is matched */
+    public final Segment with;
+
+    /** the "other" edge that the dragged edge is matched with */
+    public final Segment edge;
+
+    /** the signed distance between the matched edges */
+    public final int delta;
+
+    /** the type of constraint this is a match for */
+    public final ConstraintType type;
+
+    /** whether this {@link Match} results in a cycle */
+    public boolean cycle;
+
+    /** The associated {@link GuidelineHander} which performed the match */
+    private final GuidelineHandler mHandler;
+
+    /**
+     * Create a new match.
+     *
+     * @param handler the handler which performed the match
+     * @param edge the "other" edge that the dragged edge is matched with
+     * @param with the edge of the dragged node that is matched
+     * @param type the type of constraint this is a match for
+     * @param delta the signed distance between the matched edges
+     */
+    public Match(GuidelineHandler handler, Segment edge, Segment with,
+            ConstraintType type, int delta) {
+        mHandler = handler;
+
+        this.edge = edge;
+        this.with = with;
+        this.type = type;
+        this.delta = delta;
+    }
+
+    /**
+     * Returns the XML constraint attribute value for this match
+     *
+     * @param generateId whether an id should be generated if one is missing
+     * @return the XML constraint attribute value for this match
+     */
+    public String getConstraint(boolean generateId) {
+        if (type.targetParent) {
+            return type.name + '=' + VALUE_TRUE;
+        } else {
+            String id = edge.id;
+            if (id == null || id.length() == -1) {
+                if (!generateId) {
+                    // Placeholder to display for the user during dragging
+                    id = "<generated>";
+                } else {
+                    // Must generate an id on the fly!
+                    // See if it's been set by a different constraint we've already applied
+                    // to this same node
+                    id = edge.node.getStringAttr(ANDROID_URI, ATTR_ID);
+                    if (id == null || id.length() == 0) {
+                        id = mHandler.getRulesEngine().getUniqueId(edge.node.getFqcn());
+                        edge.node.setAttribute(ANDROID_URI, ATTR_ID, id);
+                    }
+                }
+            }
+            return type.name + '=' + id;
+        }
+    }
+
+    @Override
+    public String toString() {
+        return "Match [type=" + type + ", delta=" + delta + ", edge=" + edge
+                + "]";
+    }
+}