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/*
* Copyright (C) 2009 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.eclipse.adt.internal.editors.layout.gle2;
import com.android.annotations.NonNull;
import com.android.ide.common.api.INode.IAttribute;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Represents one XML attribute in a {@link SimpleElement}.
* <p/>
* The attribute is always represented by a namespace URI, a name and a value.
* The name cannot be empty.
* The namespace URI can be empty for an attribute without a namespace but is never null.
* The value can be empty but cannot be null.
* <p/>
* For a more detailed explanation of the purpose of this class,
* please see {@link SimpleXmlTransfer}.
*/
public class SimpleAttribute implements IAttribute {
private final String mName;
private final String mValue;
private final String mUri;
/**
* Creates a new {@link SimpleAttribute}.
* <p/>
* Any null value will be converted to an empty non-null string.
* However it is a semantic error to use an empty name -- no assertion is done though.
*
* @param uri The URI of the attribute.
* @param name The XML local name of the attribute.
* @param value The value of the attribute.
*/
public SimpleAttribute(String uri, String name, String value) {
mUri = uri == null ? "" : uri;
mName = name == null ? "" : name;
mValue = value == null ? "" : value;
}
/**
* Returns the namespace URI of the attribute.
* Can be empty for an attribute without a namespace but is never null.
*/
@Override
public @NonNull String getUri() {
return mUri;
}
/** Returns the XML local name of the attribute. Cannot be null nor empty. */
@Override
public @NonNull String getName() {
return mName;
}
/** Returns the value of the attribute. Cannot be null. Can be empty. */
@Override
public @NonNull String getValue() {
return mValue;
}
// reader and writer methods
@Override
public String toString() {
return String.format("@%s:%s=%s\n", //$NON-NLS-1$
mName,
mUri,
mValue);
}
private static final Pattern REGEXP =
Pattern.compile("[^@]*@([^:]+):([^=]*)=([^\n]*)\n*"); //$NON-NLS-1$
static SimpleAttribute parseString(String value) {
Matcher m = REGEXP.matcher(value);
if (m.matches()) {
return new SimpleAttribute(m.group(2), m.group(1), m.group(3));
}
return null;
}
@Override
public boolean equals(Object obj) {
if (obj instanceof SimpleAttribute) {
SimpleAttribute sa = (SimpleAttribute) obj;
return mName.equals(sa.mName) &&
mUri.equals(sa.mUri) &&
mValue.equals(sa.mValue);
}
return false;
}
@Override
public int hashCode() {
long c = mName.hashCode();
// uses the formula defined in java.util.List.hashCode()
c = 31*c + mUri.hashCode();
c = 31*c + mValue.hashCode();
if (c > 0x0FFFFFFFFL) {
// wrap any overflow
c = c ^ (c >> 32);
}
return (int)(c & 0x0FFFFFFFFL);
}
}
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