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/*
* 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
+ "]";
}
}
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