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Truffle is a multi-language framework for executing dynamic languages
that achieves high performance when combined with Graal.
/*
* Copyright (c) 2013, 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.oracle.truffle.api.source;
import java.net.URI;
import java.net.URL;
final class SubSourceImpl extends Source {
private final Key key;
static Source create(Source base, int baseIndex, int length) {
if (baseIndex < 0 || length < 0 || baseIndex + length > base.getLength()) {
throw new IllegalArgumentException("text positions out of range");
}
return new SubSourceImpl(new Key(base, baseIndex, length));
}
private SubSourceImpl(Key key) {
this.key = key;
}
@Override
Source copy() {
return new SubSourceImpl(key);
}
@Override
public boolean isCached() {
return key.base.isCached();
}
@Override
protected Object getSourceId() {
return key;
}
@Override
public String getName() {
return key.base.getName();
}
@Override
public String getPath() {
return key.base.getPath();
}
@Override
public URL getURL() {
return key.base.getURL();
}
@Override
public URI getOriginalURI() {
return key.base.getURI();
}
@Override
public CharSequence getCharacters() {
return key.base.getCharacters().subSequence(key.baseIndex, key.baseIndex + key.subLength);
}
@Override
public boolean isInternal() {
return key.base.isInternal();
}
@Override
public boolean isInteractive() {
return key.base.isInteractive();
}
@Override
public String getMimeType() {
return key.base.getMimeType();
}
@Override
public String getLanguage() {
return key.base.getLanguage();
}
private static final class Key {
final Source base;
final int baseIndex;
final int subLength;
Key(Source base, int baseIndex, int length) {
this.base = base;
this.baseIndex = baseIndex;
this.subLength = length;
}
@Override
public boolean equals(Object obj) {
if (!(obj instanceof Key)) {
return false;
}
Key other = (Key) obj;
return base.equals(other.base) && baseIndex == other.baseIndex && subLength == other.subLength;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + base.hashCode();
result = prime * result + baseIndex;
result = prime * result + subLength;
return result;
}
}
}
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